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r59329aa	re29cc2e
1		{"version":3,"file":"overlay.js","sources":["../../../../../../src/cdk/overlay/scroll/block-scroll-strategy.ts","../../../../../../src/cdk/overlay/scroll/scroll-strategy.ts","../../../../../../src/cdk/overlay/scroll/close-scroll-strategy.ts","../../../../../../src/cdk/overlay/scroll/noop-scroll-strategy.ts","../../../../../../src/cdk/overlay/position/scroll-clip.ts","../../../../../../src/cdk/overlay/scroll/reposition-scroll-strategy.ts","../../../../../../src/cdk/overlay/scroll/scroll-strategy-options.ts","../../../../../../src/cdk/overlay/scroll/index.ts","../../../../../../src/cdk/overlay/overlay-config.ts","../../../../../../src/cdk/overlay/position/connected-position.ts","../../../../../../src/cdk/overlay/dispatchers/base-overlay-dispatcher.ts","../../../../../../src/cdk/overlay/dispatchers/overlay-keyboard-dispatcher.ts","../../../../../../src/cdk/overlay/dispatchers/overlay-outside-click-dispatcher.ts","../../../../../../src/cdk/overlay/overlay-container.ts","../../../../../../src/cdk/overlay/overlay-ref.ts","../../../../../../src/cdk/overlay/position/flexible-connected-position-strategy.ts","../../../../../../src/cdk/overlay/position/connected-position-strategy.ts","../../../../../../src/cdk/overlay/position/global-position-strategy.ts","../../../../../../src/cdk/overlay/position/overlay-position-builder.ts","../../../../../../src/cdk/overlay/overlay.ts","../../../../../../src/cdk/overlay/overlay-directives.ts","../../../../../../src/cdk/overlay/overlay-module.ts","../../../../../../src/cdk/overlay/dispatchers/index.ts","../../../../../../src/cdk/overlay/fullscreen-overlay-container.ts","../../../../../../src/cdk/overlay/public-api.ts","../../../../../../src/cdk/overlay/index.ts"],"sourcesContent":["/*\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {ScrollStrategy} from './scroll-strategy';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {coerceCssPixelValue} from '@angular/cdk/coercion';\nimport {supportsScrollBehavior} from '@angular/cdk/platform';\n\nconst scrollBehaviorSupported = supportsScrollBehavior();\n\n/\n Strategy that will prevent the user from scrolling while the overlay is visible.\n /\nexport class BlockScrollStrategy implements ScrollStrategy {\n private _previousHTMLStyles = {top: '', left: ''};\n private _previousScrollPosition: {top: number, left: number};\n private _isEnabled = false;\n private _document: Document;\n\n constructor(private _viewportRuler: ViewportRuler, document: any) {\n this._document = document;\n }\n\n /* Attaches this scroll strategy to an overlay. /\n attach() {}\n\n /* Blocks page-level scroll while the attached overlay is open. /\n enable() {\n if (this._canBeEnabled()) {\n const root = this._document.documentElement!;\n\n this._previousScrollPosition = this._viewportRuler.getViewportScrollPosition();\n\n // Cache the previous inline styles in case the user had set them.\n this._previousHTMLStyles.left = root.style.left \|\| '';\n this._previousHTMLStyles.top = root.style.top \|\| '';\n\n // Note: we're using the `html` node, instead of the `body`, because the `body` may\n // have the user agent margin, whereas the `html` is guaranteed not to have one.\n root.style.left = coerceCssPixelValue(-this._previousScrollPosition.left);\n root.style.top = coerceCssPixelValue(-this._previousScrollPosition.top);\n root.classList.add('cdk-global-scrollblock');\n this._isEnabled = true;\n }\n }\n\n /* Unblocks page-level scroll while the attached overlay is open. /\n disable() {\n if (this._isEnabled) {\n const html = this._document.documentElement!;\n const body = this._document.body!;\n const htmlStyle = html.style;\n const bodyStyle = body.style;\n const previousHtmlScrollBehavior = htmlStyle.scrollBehavior \|\| '';\n const previousBodyScrollBehavior = bodyStyle.scrollBehavior \|\| '';\n\n this._isEnabled = false;\n\n htmlStyle.left = this._previousHTMLStyles.left;\n htmlStyle.top = this._previousHTMLStyles.top;\n html.classList.remove('cdk-global-scrollblock');\n\n // Disable user-defined smooth scrolling temporarily while we restore the scroll position.\n // See https://developer.mozilla.org/en-US/docs/Web/CSS/scroll-behavior\n // Note that we don't mutate the property if the browser doesn't support `scroll-behavior`,\n // because it can throw off feature detections in `supportsScrollBehavior` which\n // checks for `'scrollBehavior' in documentElement.style`.\n if (scrollBehaviorSupported) {\n htmlStyle.scrollBehavior = bodyStyle.scrollBehavior = 'auto';\n }\n\n window.scroll(this._previousScrollPosition.left, this._previousScrollPosition.top);\n\n if (scrollBehaviorSupported) {\n htmlStyle.scrollBehavior = previousHtmlScrollBehavior;\n bodyStyle.scrollBehavior = previousBodyScrollBehavior;\n }\n }\n }\n\n private _canBeEnabled(): boolean {\n // Since the scroll strategies can't be singletons, we have to use a global CSS class\n // (`cdk-global-scrollblock`) to make sure that we don't try to disable global\n // scrolling multiple times.\n const html = this._document.documentElement!;\n\n if (html.classList.contains('cdk-global-scrollblock') \|\| this._isEnabled) {\n return false;\n }\n\n const body = this._document.body;\n const viewport = this._viewportRuler.getViewportSize();\n return body.scrollHeight > viewport.height \|\| body.scrollWidth > viewport.width;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {OverlayReference} from '../overlay-reference';\n\n/\n Describes a strategy that will be used by an overlay to handle scroll events while it is open.\n /\nexport interface ScrollStrategy {\n /* Enable this scroll strategy (called when the attached overlay is attached to a portal). /\n enable: () => void;\n\n /* Disable this scroll strategy (called when the attached overlay is detached from a portal). /\n disable: () => void;\n\n /* Attaches this `ScrollStrategy` to an overlay. /\n attach: (overlayRef: OverlayReference) => void;\n\n /* Detaches the scroll strategy from the current overlay. /\n detach?: () => void;\n}\n\n/\n Returns an error to be thrown when attempting to attach an already-attached scroll strategy.\n /\nexport function getMatScrollStrategyAlreadyAttachedError(): Error {\n return Error(`Scroll strategy has already been attached.`);\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\nimport {NgZone} from '@angular/core';\nimport {ScrollStrategy, getMatScrollStrategyAlreadyAttachedError} from './scroll-strategy';\nimport {OverlayReference} from '../overlay-reference';\nimport {Subscription} from 'rxjs';\nimport {ScrollDispatcher, ViewportRuler} from '@angular/cdk/scrolling';\n\n/\n Config options for the CloseScrollStrategy.\n /\nexport interface CloseScrollStrategyConfig {\n /* Amount of pixels the user has to scroll before the overlay is closed. /\n threshold?: number;\n}\n\n/\n Strategy that will close the overlay as soon as the user starts scrolling.\n /\nexport class CloseScrollStrategy implements ScrollStrategy {\n private _scrollSubscription: Subscription\|null = null;\n private _overlayRef: OverlayReference;\n private _initialScrollPosition: number;\n\n constructor(\n private _scrollDispatcher: ScrollDispatcher,\n private _ngZone: NgZone,\n private _viewportRuler: ViewportRuler,\n private _config?: CloseScrollStrategyConfig) {}\n\n /* Attaches this scroll strategy to an overlay. /\n attach(overlayRef: OverlayReference) {\n if (this._overlayRef && (typeof ngDevMode === 'undefined' \|\| ngDevMode)) {\n throw getMatScrollStrategyAlreadyAttachedError();\n }\n\n this._overlayRef = overlayRef;\n }\n\n /* Enables the closing of the attached overlay on scroll. /\n enable() {\n if (this._scrollSubscription) {\n return;\n }\n\n const stream = this._scrollDispatcher.scrolled(0);\n\n if (this._config && this._config.threshold && this._config.threshold > 1) {\n this._initialScrollPosition = this._viewportRuler.getViewportScrollPosition().top;\n\n this._scrollSubscription = stream.subscribe(() => {\n const scrollPosition = this._viewportRuler.getViewportScrollPosition().top;\n\n if (Math.abs(scrollPosition - this._initialScrollPosition) > this._config!.threshold!) {\n this._detach();\n } else {\n this._overlayRef.updatePosition();\n }\n });\n } else {\n this._scrollSubscription = stream.subscribe(this._detach);\n }\n }\n\n /* Disables the closing the attached overlay on scroll. /\n disable() {\n if (this._scrollSubscription) {\n this._scrollSubscription.unsubscribe();\n this._scrollSubscription = null;\n }\n }\n\n detach() {\n this.disable();\n this._overlayRef = null!;\n }\n\n /* Detaches the overlay ref and disables the scroll strategy. /\n private _detach = () => {\n this.disable();\n\n if (this._overlayRef.hasAttached()) {\n this._ngZone.run(() => this._overlayRef.detach());\n }\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {ScrollStrategy} from './scroll-strategy';\n\n/* Scroll strategy that doesn't do anything. /\nexport class NoopScrollStrategy implements ScrollStrategy {\n /* Does nothing, as this scroll strategy is a no-op. /\n enable() { }\n /* Does nothing, as this scroll strategy is a no-op. /\n disable() { }\n /* Does nothing, as this scroll strategy is a no-op. /\n attach() { }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\n// TODO(jelbourn): move this to live with the rest of the scrolling code\n// TODO(jelbourn): someday replace this with IntersectionObservers\n\n/\n Gets whether an element is scrolled outside of view by any of its parent scrolling containers.\n * @param element Dimensions of the element (from getBoundingClientRect)\n * @param scrollContainers Dimensions of element's scrolling containers (from getBoundingClientRect)\n * @returns Whether the element is scrolled out of view\n * @docs-private\n /\nexport function isElementScrolledOutsideView(element: ClientRect, scrollContainers: ClientRect[]) {\n return scrollContainers.some(containerBounds => {\n const outsideAbove = element.bottom < containerBounds.top;\n const outsideBelow = element.top > containerBounds.bottom;\n const outsideLeft = element.right < containerBounds.left;\n const outsideRight = element.left > containerBounds.right;\n\n return outsideAbove \|\| outsideBelow \|\| outsideLeft \|\| outsideRight;\n });\n}\n\n\n/\n Gets whether an element is clipped by any of its scrolling containers.\n * @param element Dimensions of the element (from getBoundingClientRect)\n * @param scrollContainers Dimensions of element's scrolling containers (from getBoundingClientRect)\n * @returns Whether the element is clipped\n * @docs-private\n /\nexport function isElementClippedByScrolling(element: ClientRect, scrollContainers: ClientRect[]) {\n return scrollContainers.some(scrollContainerRect => {\n const clippedAbove = element.top < scrollContainerRect.top;\n const clippedBelow = element.bottom > scrollContainerRect.bottom;\n const clippedLeft = element.left < scrollContainerRect.left;\n const clippedRight = element.right > scrollContainerRect.right;\n\n return clippedAbove \|\| clippedBelow \|\| clippedLeft \|\| clippedRight;\n });\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {NgZone} from '@angular/core';\nimport {Subscription} from 'rxjs';\nimport {ScrollStrategy, getMatScrollStrategyAlreadyAttachedError} from './scroll-strategy';\nimport {OverlayReference} from '../overlay-reference';\nimport {ScrollDispatcher, ViewportRuler} from '@angular/cdk/scrolling';\nimport {isElementScrolledOutsideView} from '../position/scroll-clip';\n\n/\n Config options for the RepositionScrollStrategy.\n /\nexport interface RepositionScrollStrategyConfig {\n /* Time in milliseconds to throttle the scroll events. /\n scrollThrottle?: number;\n\n /* Whether to close the overlay once the user has scrolled away completely. /\n autoClose?: boolean;\n}\n\n/\n Strategy that will update the element position as the user is scrolling.\n /\nexport class RepositionScrollStrategy implements ScrollStrategy {\n private _scrollSubscription: Subscription\|null = null;\n private _overlayRef: OverlayReference;\n\n constructor(\n private _scrollDispatcher: ScrollDispatcher,\n private _viewportRuler: ViewportRuler,\n private _ngZone: NgZone,\n private _config?: RepositionScrollStrategyConfig) { }\n\n /* Attaches this scroll strategy to an overlay. /\n attach(overlayRef: OverlayReference) {\n if (this._overlayRef && (typeof ngDevMode === 'undefined' \|\| ngDevMode)) {\n throw getMatScrollStrategyAlreadyAttachedError();\n }\n\n this._overlayRef = overlayRef;\n }\n\n /* Enables repositioning of the attached overlay on scroll. /\n enable() {\n if (!this._scrollSubscription) {\n const throttle = this._config ? this._config.scrollThrottle : 0;\n\n this._scrollSubscription = this._scrollDispatcher.scrolled(throttle).subscribe(() => {\n this._overlayRef.updatePosition();\n\n // TODO(crisbeto): make `close` on by default once all components can handle it.\n if (this._config && this._config.autoClose) {\n const overlayRect = this._overlayRef.overlayElement.getBoundingClientRect();\n const {width, height} = this._viewportRuler.getViewportSize();\n\n // TODO(crisbeto): include all ancestor scroll containers here once\n // we have a way of exposing the trigger element to the scroll strategy.\n const parentRects = [{width, height, bottom: height, right: width, top: 0, left: 0}];\n\n if (isElementScrolledOutsideView(overlayRect, parentRects)) {\n this.disable();\n this._ngZone.run(() => this._overlayRef.detach());\n }\n }\n });\n }\n }\n\n /* Disables repositioning of the attached overlay on scroll. /\n disable() {\n if (this._scrollSubscription) {\n this._scrollSubscription.unsubscribe();\n this._scrollSubscription = null;\n }\n }\n\n detach() {\n this.disable();\n this._overlayRef = null!;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {ScrollDispatcher, ViewportRuler} from '@angular/cdk/scrolling';\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, NgZone} from '@angular/core';\nimport {BlockScrollStrategy} from './block-scroll-strategy';\nimport {CloseScrollStrategy, CloseScrollStrategyConfig} from './close-scroll-strategy';\nimport {NoopScrollStrategy} from './noop-scroll-strategy';\nimport {\n RepositionScrollStrategy,\n RepositionScrollStrategyConfig,\n} from './reposition-scroll-strategy';\n\n\n/\n Options for how an overlay will handle scrolling.\n \n Users can provide a custom value for `ScrollStrategyOptions` to replace the default\n * behaviors. This class primarily acts as a factory for ScrollStrategy instances.\n /\n@Injectable({providedIn: 'root'})\nexport class ScrollStrategyOptions {\n private _document: Document;\n\n constructor(\n private _scrollDispatcher: ScrollDispatcher,\n private _viewportRuler: ViewportRuler,\n private _ngZone: NgZone,\n @Inject(DOCUMENT) document: any) {\n this._document = document;\n }\n\n /* Do nothing on scroll. /\n noop = () => new NoopScrollStrategy();\n\n /\n Close the overlay as soon as the user scrolls.\n * @param config Configuration to be used inside the scroll strategy.\n /\n close = (config?: CloseScrollStrategyConfig) => new CloseScrollStrategy(this._scrollDispatcher,\n this._ngZone, this._viewportRuler, config)\n\n /* Block scrolling. /\n block = () => new BlockScrollStrategy(this._viewportRuler, this._document);\n\n /\n Update the overlay's position on scroll.\n * @param config Configuration to be used inside the scroll strategy.\n * Allows debouncing the reposition calls.\n /\n reposition = (config?: RepositionScrollStrategyConfig) => new RepositionScrollStrategy(\n this._scrollDispatcher, this._viewportRuler, this._ngZone, config)\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nexport {CdkScrollable, ScrollDispatcher} from '@angular/cdk/scrolling';\n\n// Export pre-defined scroll strategies and interface to build custom ones.\nexport {ScrollStrategy} from './scroll-strategy';\nexport {ScrollStrategyOptions} from './scroll-strategy-options';\nexport {\n RepositionScrollStrategy,\n RepositionScrollStrategyConfig\n} from './reposition-scroll-strategy';\nexport {CloseScrollStrategy} from './close-scroll-strategy';\nexport {NoopScrollStrategy} from './noop-scroll-strategy';\nexport {BlockScrollStrategy} from './block-scroll-strategy';\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {PositionStrategy} from './position/position-strategy';\nimport {Direction, Directionality} from '@angular/cdk/bidi';\nimport {ScrollStrategy, NoopScrollStrategy} from './scroll/index';\n\n\n/* Initial configuration used when creating an overlay. /\nexport class OverlayConfig {\n /* Strategy with which to position the overlay. /\n positionStrategy?: PositionStrategy;\n\n /* Strategy to be used when handling scroll events while the overlay is open. /\n scrollStrategy?: ScrollStrategy = new NoopScrollStrategy();\n\n /* Custom class to add to the overlay pane. /\n panelClass?: string \| string[] = '';\n\n /* Whether the overlay has a backdrop. /\n hasBackdrop?: boolean = false;\n\n /* Custom class to add to the backdrop /\n backdropClass?: string \| string[] = 'cdk-overlay-dark-backdrop';\n\n /* The width of the overlay panel. If a number is provided, pixel units are assumed. /\n width?: number \| string;\n\n /* The height of the overlay panel. If a number is provided, pixel units are assumed. /\n height?: number \| string;\n\n /* The min-width of the overlay panel. If a number is provided, pixel units are assumed. /\n minWidth?: number \| string;\n\n /* The min-height of the overlay panel. If a number is provided, pixel units are assumed. /\n minHeight?: number \| string;\n\n /* The max-width of the overlay panel. If a number is provided, pixel units are assumed. /\n maxWidth?: number \| string;\n\n /* The max-height of the overlay panel. If a number is provided, pixel units are assumed. /\n maxHeight?: number \| string;\n\n /\n Direction of the text in the overlay panel. If a `Directionality` instance\n * is passed in, the overlay will handle changes to its value automatically.\n /\n direction?: Direction \| Directionality;\n\n /\n Whether the overlay should be disposed of when the user goes backwards/forwards in history.\n * Note that this usually doesn't include clicking on links (unless the user is using\n * the `HashLocationStrategy`).\n /\n disposeOnNavigation?: boolean = false;\n\n constructor(config?: OverlayConfig) {\n if (config) {\n // Use `Iterable` instead of `Array` because TypeScript, as of 3.6.3,\n // loses the array generic type in the `for of`. But we also* have to use `Array` because\n // typescript won't iterate over an `Iterable` unless you compile with `--downlevelIteration`\n const configKeys =\n Object.keys(config) as Iterable<keyof OverlayConfig> & (keyof OverlayConfig)[];\n for (const key of configKeys) {\n if (config[key] !== undefined) {\n // TypeScript, as of version 3.5, sees the left-hand-side of this expression\n // as \"I don't know which key this is, so the only valid value is the intersection\n // of all the posible values.\" In this case, that happens to be `undefined`. TypeScript\n // is not smart enough to see that the right-hand-side is actually an access of the same\n // exact type with the same exact key, meaning that the value type must be identical.\n // So we use `any` to work around this.\n this[key] = config[key] as any;\n }\n }\n }\n }\n}\n","/*\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\n/* Horizontal dimension of a connection point on the perimeter of the origin or overlay element. /\nimport {Optional} from '@angular/core';\nexport type HorizontalConnectionPos = 'start' \| 'center' \| 'end';\n\n/* Vertical dimension of a connection point on the perimeter of the origin or overlay element. /\nexport type VerticalConnectionPos = 'top' \| 'center' \| 'bottom';\n\n\n/* A connection point on the origin element. /\nexport interface OriginConnectionPosition {\n originX: HorizontalConnectionPos;\n originY: VerticalConnectionPos;\n}\n\n/* A connection point on the overlay element. /\nexport interface OverlayConnectionPosition {\n overlayX: HorizontalConnectionPos;\n overlayY: VerticalConnectionPos;\n}\n\n/* The points of the origin element and the overlay element to connect. /\nexport class ConnectionPositionPair {\n /* X-axis attachment point for connected overlay origin. Can be 'start', 'end', or 'center'. /\n originX: HorizontalConnectionPos;\n /* Y-axis attachment point for connected overlay origin. Can be 'top', 'bottom', or 'center'. /\n originY: VerticalConnectionPos;\n /* X-axis attachment point for connected overlay. Can be 'start', 'end', or 'center'. /\n overlayX: HorizontalConnectionPos;\n /* Y-axis attachment point for connected overlay. Can be 'top', 'bottom', or 'center'. /\n overlayY: VerticalConnectionPos;\n\n constructor(\n origin: OriginConnectionPosition,\n overlay: OverlayConnectionPosition,\n /* Offset along the X axis. /\n public offsetX?: number,\n /* Offset along the Y axis. /\n public offsetY?: number,\n /* Class(es) to be applied to the panel while this position is active. /\n public panelClass?: string \| string[]) {\n\n this.originX = origin.originX;\n this.originY = origin.originY;\n this.overlayX = overlay.overlayX;\n this.overlayY = overlay.overlayY;\n }\n}\n\n/\n Set of properties regarding the position of the origin and overlay relative to the viewport\n * with respect to the containing Scrollable elements.\n \n The overlay and origin are clipped if any part of their bounding client rectangle exceeds the\n * bounds of any one of the strategy's Scrollable's bounding client rectangle.\n \n The overlay and origin are outside view if there is no overlap between their bounding client\n * rectangle and any one of the strategy's Scrollable's bounding client rectangle.\n \n ----------- -----------\n * \| outside \| \| clipped \|\n * \| view \| --------------------------\n * \| \| \| \| \| \|\n * ---------- \| ----------- \|\n * -------------------------- \| \|\n * \| \| \| Scrollable \|\n * \| \| \| \|\n * \| \| --------------------------\n * \| Scrollable \|\n * \| \|\n * --------------------------\n \n @docs-private\n /\nexport class ScrollingVisibility {\n isOriginClipped: boolean;\n isOriginOutsideView: boolean;\n isOverlayClipped: boolean;\n isOverlayOutsideView: boolean;\n}\n\n/* The change event emitted by the strategy when a fallback position is used. /\nexport class ConnectedOverlayPositionChange {\n constructor(\n /* The position used as a result of this change. /\n public connectionPair: ConnectionPositionPair,\n /* @docs-private /\n @Optional() public scrollableViewProperties: ScrollingVisibility) {}\n}\n\n/\n Validates whether a vertical position property matches the expected values.\n * @param property Name of the property being validated.\n * @param value Value of the property being validated.\n * @docs-private\n /\nexport function validateVerticalPosition(property: string, value: VerticalConnectionPos) {\n if (value !== 'top' && value !== 'bottom' && value !== 'center') {\n throw Error(`ConnectedPosition: Invalid ${property} \"${value}\". ` +\n `Expected \"top\", \"bottom\" or \"center\".`);\n }\n}\n\n/\n Validates whether a horizontal position property matches the expected values.\n * @param property Name of the property being validated.\n * @param value Value of the property being validated.\n * @docs-private\n /\nexport function validateHorizontalPosition(property: string, value: HorizontalConnectionPos) {\n if (value !== 'start' && value !== 'end' && value !== 'center') {\n throw Error(`ConnectedPosition: Invalid ${property} \"${value}\". ` +\n `Expected \"start\", \"end\" or \"center\".`);\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, OnDestroy} from '@angular/core';\nimport {OverlayReference} from '../overlay-reference';\n\n\n/\n Service for dispatching events that land on the body to appropriate overlay ref,\n * if any. It maintains a list of attached overlays to determine best suited overlay based\n * on event target and order of overlay opens.\n /\n@Injectable({providedIn: 'root'})\nexport abstract class BaseOverlayDispatcher implements OnDestroy {\n\n /* Currently attached overlays in the order they were attached. /\n _attachedOverlays: OverlayReference[] = [];\n\n protected _document: Document;\n protected _isAttached: boolean;\n\n constructor(@Inject(DOCUMENT) document: any) {\n this._document = document;\n }\n\n ngOnDestroy(): void {\n this.detach();\n }\n\n /* Add a new overlay to the list of attached overlay refs. /\n add(overlayRef: OverlayReference): void {\n // Ensure that we don't get the same overlay multiple times.\n this.remove(overlayRef);\n this._attachedOverlays.push(overlayRef);\n }\n\n /* Remove an overlay from the list of attached overlay refs. /\n remove(overlayRef: OverlayReference): void {\n const index = this._attachedOverlays.indexOf(overlayRef);\n\n if (index > -1) {\n this._attachedOverlays.splice(index, 1);\n }\n\n // Remove the global listener once there are no more overlays.\n if (this._attachedOverlays.length === 0) {\n this.detach();\n }\n }\n\n /* Detaches the global event listener. /\n protected abstract detach(): void;\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable} from '@angular/core';\nimport {OverlayReference} from '../overlay-reference';\nimport {BaseOverlayDispatcher} from './base-overlay-dispatcher';\n\n\n/\n Service for dispatching keyboard events that land on the body to appropriate overlay ref,\n * if any. It maintains a list of attached overlays to determine best suited overlay based\n * on event target and order of overlay opens.\n /\n@Injectable({providedIn: 'root'})\nexport class OverlayKeyboardDispatcher extends BaseOverlayDispatcher {\n\n constructor(@Inject(DOCUMENT) document: any) {\n super(document);\n }\n\n /* Add a new overlay to the list of attached overlay refs. /\n override add(overlayRef: OverlayReference): void {\n super.add(overlayRef);\n\n // Lazily start dispatcher once first overlay is added\n if (!this._isAttached) {\n this._document.body.addEventListener('keydown', this._keydownListener);\n this._isAttached = true;\n }\n }\n\n /* Detaches the global keyboard event listener. /\n protected detach() {\n if (this._isAttached) {\n this._document.body.removeEventListener('keydown', this._keydownListener);\n this._isAttached = false;\n }\n }\n\n /* Keyboard event listener that will be attached to the body. /\n private _keydownListener = (event: KeyboardEvent) => {\n const overlays = this._attachedOverlays;\n\n for (let i = overlays.length - 1; i > -1; i--) {\n // Dispatch the keydown event to the top overlay which has subscribers to its keydown events.\n // We want to target the most recent overlay, rather than trying to match where the event came\n // from, because some components might open an overlay, but keep focus on a trigger element\n // (e.g. for select and autocomplete). We skip overlays without keydown event subscriptions,\n // because we don't want overlays that don't handle keyboard events to block the ones below\n // them that do.\n if (overlays[i]._keydownEvents.observers.length > 0) {\n overlays[i]._keydownEvents.next(event);\n break;\n }\n }\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable} from '@angular/core';\nimport {OverlayReference} from '../overlay-reference';\nimport {Platform, _getEventTarget} from '@angular/cdk/platform';\nimport {BaseOverlayDispatcher} from './base-overlay-dispatcher';\n\n/\n Service for dispatching mouse click events that land on the body to appropriate overlay ref,\n * if any. It maintains a list of attached overlays to determine best suited overlay based\n * on event target and order of overlay opens.\n /\n@Injectable({providedIn: 'root'})\nexport class OverlayOutsideClickDispatcher extends BaseOverlayDispatcher {\n private _cursorOriginalValue: string;\n private _cursorStyleIsSet = false;\n\n constructor(@Inject(DOCUMENT) document: any, private _platform: Platform) {\n super(document);\n }\n\n /* Add a new overlay to the list of attached overlay refs. /\n override add(overlayRef: OverlayReference): void {\n super.add(overlayRef);\n\n // Safari on iOS does not generate click events for non-interactive\n // elements. However, we want to receive a click for any element outside\n // the overlay. We can force a \"clickable\" state by setting\n // `cursor: pointer` on the document body. See:\n // https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event#Safari_Mobile\n // https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html\n if (!this._isAttached) {\n const body = this._document.body;\n body.addEventListener('click', this._clickListener, true);\n body.addEventListener('auxclick', this._clickListener, true);\n body.addEventListener('contextmenu', this._clickListener, true);\n\n // click event is not fired on iOS. To make element \"clickable\" we are\n // setting the cursor to pointer\n if (this._platform.IOS && !this._cursorStyleIsSet) {\n this._cursorOriginalValue = body.style.cursor;\n body.style.cursor = 'pointer';\n this._cursorStyleIsSet = true;\n }\n\n this._isAttached = true;\n }\n }\n\n /* Detaches the global keyboard event listener. /\n protected detach() {\n if (this._isAttached) {\n const body = this._document.body;\n body.removeEventListener('click', this._clickListener, true);\n body.removeEventListener('auxclick', this._clickListener, true);\n body.removeEventListener('contextmenu', this._clickListener, true);\n if (this._platform.IOS && this._cursorStyleIsSet) {\n body.style.cursor = this._cursorOriginalValue;\n this._cursorStyleIsSet = false;\n }\n this._isAttached = false;\n }\n }\n\n /* Click event listener that will be attached to the body propagate phase. /\n private _clickListener = (event: MouseEvent) => {\n const target = _getEventTarget(event);\n // We copy the array because the original may be modified asynchronously if the\n // outsidePointerEvents listener decides to detach overlays resulting in index errors inside\n // the for loop.\n const overlays = this._attachedOverlays.slice();\n\n // Dispatch the mouse event to the top overlay which has subscribers to its mouse events.\n // We want to target all overlays for which the click could be considered as outside click.\n // As soon as we reach an overlay for which the click is not outside click we break off\n // the loop.\n for (let i = overlays.length - 1; i > -1; i--) {\n const overlayRef = overlays[i];\n if (overlayRef._outsidePointerEvents.observers.length < 1 \|\| !overlayRef.hasAttached()) {\n continue;\n }\n\n // If it's a click inside the overlay, just break - we should do nothing\n // If it's an outside click dispatch the mouse event, and proceed with the next overlay\n if (overlayRef.overlayElement.contains(target as Node)) {\n break;\n }\n\n overlayRef._outsidePointerEvents.next(event);\n }\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, OnDestroy} from '@angular/core';\nimport {Platform, _isTestEnvironment} from '@angular/cdk/platform';\n\n/* Container inside which all overlays will render. /\n@Injectable({providedIn: 'root'})\nexport class OverlayContainer implements OnDestroy {\n protected _containerElement: HTMLElement;\n protected _document: Document;\n\n constructor(@Inject(DOCUMENT) document: any, protected _platform: Platform) {\n this._document = document;\n }\n\n ngOnDestroy() {\n const container = this._containerElement;\n\n if (container && container.parentNode) {\n container.parentNode.removeChild(container);\n }\n }\n\n /\n This method returns the overlay container element. It will lazily\n * create the element the first time it is called to facilitate using\n * the container in non-browser environments.\n * @returns the container element\n /\n getContainerElement(): HTMLElement {\n if (!this._containerElement) {\n this._createContainer();\n }\n\n return this._containerElement;\n }\n\n /\n Create the overlay container element, which is simply a div\n * with the 'cdk-overlay-container' class on the document body.\n /\n protected _createContainer(): void {\n const containerClass = 'cdk-overlay-container';\n\n // TODO(crisbeto): remove the testing check once we have an overlay testing\n // module or Angular starts tearing down the testing `NgModule`. See:\n // https://github.com/angular/angular/issues/18831\n if (this._platform.isBrowser \|\| _isTestEnvironment()) {\n const oppositePlatformContainers =\n this._document.querySelectorAll(`.${containerClass}[platform=\"server\"], ` +\n `.${containerClass}[platform=\"test\"]`);\n\n // Remove any old containers from the opposite platform.\n // This can happen when transitioning from the server to the client.\n for (let i = 0; i < oppositePlatformContainers.length; i++) {\n oppositePlatformContainers[i].parentNode!.removeChild(oppositePlatformContainers[i]);\n }\n }\n\n const container = this._document.createElement('div');\n container.classList.add(containerClass);\n\n // A long time ago we kept adding new overlay containers whenever a new app was instantiated,\n // but at some point we added logic which clears the duplicate ones in order to avoid leaks.\n // The new logic was a little too aggressive since it was breaking some legitimate use cases.\n // To mitigate the problem we made it so that only containers from a different platform are\n // cleared, but the side-effect was that people started depending on the overly-aggressive\n // logic to clean up their tests for them. Until we can introduce an overlay-specific testing\n // module which does the cleanup, we try to detect that we're in a test environment and we\n // always clear the container. See #17006.\n // TODO(crisbeto): remove the test environment check once we have an overlay testing module.\n if (_isTestEnvironment()) {\n container.setAttribute('platform', 'test');\n } else if (!this._platform.isBrowser) {\n container.setAttribute('platform', 'server');\n }\n\n this._document.body.appendChild(container);\n this._containerElement = container;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Direction, Directionality} from '@angular/cdk/bidi';\nimport {ComponentPortal, Portal, PortalOutlet, TemplatePortal} from '@angular/cdk/portal';\nimport {ComponentRef, EmbeddedViewRef, NgZone} from '@angular/core';\nimport {Location} from '@angular/common';\nimport {Observable, Subject, merge, SubscriptionLike, Subscription} from 'rxjs';\nimport {take, takeUntil} from 'rxjs/operators';\nimport {OverlayKeyboardDispatcher} from './dispatchers/overlay-keyboard-dispatcher';\nimport {OverlayOutsideClickDispatcher} from './dispatchers/overlay-outside-click-dispatcher';\nimport {OverlayConfig} from './overlay-config';\nimport {coerceCssPixelValue, coerceArray} from '@angular/cdk/coercion';\nimport {OverlayReference} from './overlay-reference';\nimport {PositionStrategy} from './position/position-strategy';\nimport {ScrollStrategy} from './scroll';\n\n\n/* An object where all of its properties cannot be written. /\nexport type ImmutableObject<T> = {\n readonly [P in keyof T]: T[P];\n};\n\n/\n Reference to an overlay that has been created with the Overlay service.\n * Used to manipulate or dispose of said overlay.\n /\nexport class OverlayRef implements PortalOutlet, OverlayReference {\n private _backdropElement: HTMLElement \| null = null;\n private readonly _backdropClick = new Subject<MouseEvent>();\n private readonly _attachments = new Subject<void>();\n private readonly _detachments = new Subject<void>();\n private _positionStrategy: PositionStrategy \| undefined;\n private _scrollStrategy: ScrollStrategy \| undefined;\n private _locationChanges: SubscriptionLike = Subscription.EMPTY;\n private _backdropClickHandler = (event: MouseEvent) => this._backdropClick.next(event);\n\n /\n Reference to the parent of the `_host` at the time it was detached. Used to restore\n * the `_host` to its original position in the DOM when it gets re-attached.\n /\n private _previousHostParent: HTMLElement;\n\n /* Stream of keydown events dispatched to this overlay. /\n readonly _keydownEvents = new Subject<KeyboardEvent>();\n\n /* Stream of mouse outside events dispatched to this overlay. /\n readonly _outsidePointerEvents = new Subject<MouseEvent>();\n\n constructor(\n private _portalOutlet: PortalOutlet,\n private _host: HTMLElement,\n private _pane: HTMLElement,\n private _config: ImmutableObject<OverlayConfig>,\n private _ngZone: NgZone,\n private _keyboardDispatcher: OverlayKeyboardDispatcher,\n private _document: Document,\n private _location: Location,\n private _outsideClickDispatcher: OverlayOutsideClickDispatcher) {\n\n if (_config.scrollStrategy) {\n this._scrollStrategy = _config.scrollStrategy;\n this._scrollStrategy.attach(this);\n }\n\n this._positionStrategy = _config.positionStrategy;\n }\n\n /* The overlay's HTML element /\n get overlayElement(): HTMLElement {\n return this._pane;\n }\n\n /* The overlay's backdrop HTML element. /\n get backdropElement(): HTMLElement \| null {\n return this._backdropElement;\n }\n\n /\n Wrapper around the panel element. Can be used for advanced\n * positioning where a wrapper with specific styling is\n * required around the overlay pane.\n /\n get hostElement(): HTMLElement {\n return this._host;\n }\n\n attach<T>(portal: ComponentPortal<T>): ComponentRef<T>;\n attach<T>(portal: TemplatePortal<T>): EmbeddedViewRef<T>;\n attach(portal: any): any;\n\n /\n Attaches content, given via a Portal, to the overlay.\n * If the overlay is configured to have a backdrop, it will be created.\n \n @param portal Portal instance to which to attach the overlay.\n * @returns The portal attachment result.\n /\n attach(portal: Portal<any>): any {\n let attachResult = this._portalOutlet.attach(portal);\n\n // Update the pane element with the given configuration.\n if (!this._host.parentElement && this._previousHostParent) {\n this._previousHostParent.appendChild(this._host);\n }\n\n if (this._positionStrategy) {\n this._positionStrategy.attach(this);\n }\n\n this._updateStackingOrder();\n this._updateElementSize();\n this._updateElementDirection();\n\n if (this._scrollStrategy) {\n this._scrollStrategy.enable();\n }\n\n // Update the position once the zone is stable so that the overlay will be fully rendered\n // before attempting to position it, as the position may depend on the size of the rendered\n // content.\n this._ngZone.onStable\n .pipe(take(1))\n .subscribe(() => {\n // The overlay could've been detached before the zone has stabilized.\n if (this.hasAttached()) {\n this.updatePosition();\n }\n });\n\n // Enable pointer events for the overlay pane element.\n this._togglePointerEvents(true);\n\n if (this._config.hasBackdrop) {\n this._attachBackdrop();\n }\n\n if (this._config.panelClass) {\n this._toggleClasses(this._pane, this._config.panelClass, true);\n }\n\n // Only emit the `attachments` event once all other setup is done.\n this._attachments.next();\n\n // Track this overlay by the keyboard dispatcher\n this._keyboardDispatcher.add(this);\n\n if (this._config.disposeOnNavigation) {\n this._locationChanges = this._location.subscribe(() => this.dispose());\n }\n\n this._outsideClickDispatcher.add(this);\n return attachResult;\n }\n\n /\n Detaches an overlay from a portal.\n * @returns The portal detachment result.\n /\n detach(): any {\n if (!this.hasAttached()) {\n return;\n }\n\n this.detachBackdrop();\n\n // When the overlay is detached, the pane element should disable pointer events.\n // This is necessary because otherwise the pane element will cover the page and disable\n // pointer events therefore. Depends on the position strategy and the applied pane boundaries.\n this._togglePointerEvents(false);\n\n if (this._positionStrategy && this._positionStrategy.detach) {\n this._positionStrategy.detach();\n }\n\n if (this._scrollStrategy) {\n this._scrollStrategy.disable();\n }\n\n const detachmentResult = this._portalOutlet.detach();\n\n // Only emit after everything is detached.\n this._detachments.next();\n\n // Remove this overlay from keyboard dispatcher tracking.\n this._keyboardDispatcher.remove(this);\n\n // Keeping the host element in the DOM can cause scroll jank, because it still gets\n // rendered, even though it's transparent and unclickable which is why we remove it.\n this._detachContentWhenStable();\n this._locationChanges.unsubscribe();\n this._outsideClickDispatcher.remove(this);\n return detachmentResult;\n }\n\n /* Cleans up the overlay from the DOM. /\n dispose(): void {\n const isAttached = this.hasAttached();\n\n if (this._positionStrategy) {\n this._positionStrategy.dispose();\n }\n\n this._disposeScrollStrategy();\n this._disposeBackdrop(this._backdropElement);\n this._locationChanges.unsubscribe();\n this._keyboardDispatcher.remove(this);\n this._portalOutlet.dispose();\n this._attachments.complete();\n this._backdropClick.complete();\n this._keydownEvents.complete();\n this._outsidePointerEvents.complete();\n this._outsideClickDispatcher.remove(this);\n\n if (this._host && this._host.parentNode) {\n this._host.parentNode.removeChild(this._host);\n this._host = null!;\n }\n\n this._previousHostParent = this._pane = null!;\n\n if (isAttached) {\n this._detachments.next();\n }\n\n this._detachments.complete();\n }\n\n /* Whether the overlay has attached content. /\n hasAttached(): boolean {\n return this._portalOutlet.hasAttached();\n }\n\n /* Gets an observable that emits when the backdrop has been clicked. /\n backdropClick(): Observable<MouseEvent> {\n return this._backdropClick;\n }\n\n /* Gets an observable that emits when the overlay has been attached. /\n attachments(): Observable<void> {\n return this._attachments;\n }\n\n /* Gets an observable that emits when the overlay has been detached. /\n detachments(): Observable<void> {\n return this._detachments;\n }\n\n /* Gets an observable of keydown events targeted to this overlay. /\n keydownEvents(): Observable<KeyboardEvent> {\n return this._keydownEvents;\n }\n\n /* Gets an observable of pointer events targeted outside this overlay. /\n outsidePointerEvents(): Observable<MouseEvent> {\n return this._outsidePointerEvents;\n }\n\n /* Gets the current overlay configuration, which is immutable. /\n getConfig(): OverlayConfig {\n return this._config;\n }\n\n /* Updates the position of the overlay based on the position strategy. /\n updatePosition(): void {\n if (this._positionStrategy) {\n this._positionStrategy.apply();\n }\n }\n\n /* Switches to a new position strategy and updates the overlay position. /\n updatePositionStrategy(strategy: PositionStrategy): void {\n if (strategy === this._positionStrategy) {\n return;\n }\n\n if (this._positionStrategy) {\n this._positionStrategy.dispose();\n }\n\n this._positionStrategy = strategy;\n\n if (this.hasAttached()) {\n strategy.attach(this);\n this.updatePosition();\n }\n }\n\n /* Update the size properties of the overlay. /\n updateSize(sizeConfig: OverlaySizeConfig): void {\n this._config = {...this._config, ...sizeConfig};\n this._updateElementSize();\n }\n\n /* Sets the LTR/RTL direction for the overlay. /\n setDirection(dir: Direction \| Directionality): void {\n this._config = {...this._config, direction: dir};\n this._updateElementDirection();\n }\n\n /* Add a CSS class or an array of classes to the overlay pane. /\n addPanelClass(classes: string \| string[]): void {\n if (this._pane) {\n this._toggleClasses(this._pane, classes, true);\n }\n }\n\n /* Remove a CSS class or an array of classes from the overlay pane. /\n removePanelClass(classes: string \| string[]): void {\n if (this._pane) {\n this._toggleClasses(this._pane, classes, false);\n }\n }\n\n /\n Returns the layout direction of the overlay panel.\n /\n getDirection(): Direction {\n const direction = this._config.direction;\n\n if (!direction) {\n return 'ltr';\n }\n\n return typeof direction === 'string' ? direction : direction.value;\n }\n\n /* Switches to a new scroll strategy. /\n updateScrollStrategy(strategy: ScrollStrategy): void {\n if (strategy === this._scrollStrategy) {\n return;\n }\n\n this._disposeScrollStrategy();\n this._scrollStrategy = strategy;\n\n if (this.hasAttached()) {\n strategy.attach(this);\n strategy.enable();\n }\n }\n\n /* Updates the text direction of the overlay panel. /\n private _updateElementDirection() {\n this._host.setAttribute('dir', this.getDirection());\n }\n\n /* Updates the size of the overlay element based on the overlay config. /\n private _updateElementSize() {\n if (!this._pane) {\n return;\n }\n\n const style = this._pane.style;\n\n style.width = coerceCssPixelValue(this._config.width);\n style.height = coerceCssPixelValue(this._config.height);\n style.minWidth = coerceCssPixelValue(this._config.minWidth);\n style.minHeight = coerceCssPixelValue(this._config.minHeight);\n style.maxWidth = coerceCssPixelValue(this._config.maxWidth);\n style.maxHeight = coerceCssPixelValue(this._config.maxHeight);\n }\n\n /* Toggles the pointer events for the overlay pane element. /\n private _togglePointerEvents(enablePointer: boolean) {\n this._pane.style.pointerEvents = enablePointer ? '' : 'none';\n }\n\n /* Attaches a backdrop for this overlay. /\n private _attachBackdrop() {\n const showingClass = 'cdk-overlay-backdrop-showing';\n\n this._backdropElement = this._document.createElement('div');\n this._backdropElement.classList.add('cdk-overlay-backdrop');\n\n if (this._config.backdropClass) {\n this._toggleClasses(this._backdropElement, this._config.backdropClass, true);\n }\n\n // Insert the backdrop before the pane in the DOM order,\n // in order to handle stacked overlays properly.\n this._host.parentElement!.insertBefore(this._backdropElement, this._host);\n\n // Forward backdrop clicks such that the consumer of the overlay can perform whatever\n // action desired when such a click occurs (usually closing the overlay).\n this._backdropElement.addEventListener('click', this._backdropClickHandler);\n\n // Add class to fade-in the backdrop after one frame.\n if (typeof requestAnimationFrame !== 'undefined') {\n this._ngZone.runOutsideAngular(() => {\n requestAnimationFrame(() => {\n if (this._backdropElement) {\n this._backdropElement.classList.add(showingClass);\n }\n });\n });\n } else {\n this._backdropElement.classList.add(showingClass);\n }\n }\n\n /\n Updates the stacking order of the element, moving it to the top if necessary.\n * This is required in cases where one overlay was detached, while another one,\n * that should be behind it, was destroyed. The next time both of them are opened,\n * the stacking will be wrong, because the detached element's pane will still be\n * in its original DOM position.\n /\n private _updateStackingOrder() {\n if (this._host.nextSibling) {\n this._host.parentNode!.appendChild(this._host);\n }\n }\n\n /* Detaches the backdrop (if any) associated with the overlay. /\n detachBackdrop(): void {\n const backdropToDetach = this._backdropElement;\n\n if (!backdropToDetach) {\n return;\n }\n\n let timeoutId: any;\n const finishDetach = () => {\n // It may not be attached to anything in certain cases (e.g. unit tests).\n if (backdropToDetach) {\n backdropToDetach.removeEventListener('click', this._backdropClickHandler);\n backdropToDetach.removeEventListener('transitionend', finishDetach);\n this._disposeBackdrop(backdropToDetach);\n }\n\n if (this._config.backdropClass) {\n this._toggleClasses(backdropToDetach!, this._config.backdropClass, false);\n }\n\n clearTimeout(timeoutId);\n };\n\n backdropToDetach.classList.remove('cdk-overlay-backdrop-showing');\n\n this._ngZone.runOutsideAngular(() => {\n backdropToDetach!.addEventListener('transitionend', finishDetach);\n });\n\n // If the backdrop doesn't have a transition, the `transitionend` event won't fire.\n // In this case we make it unclickable and we try to remove it after a delay.\n backdropToDetach.style.pointerEvents = 'none';\n\n // Run this outside the Angular zone because there's nothing that Angular cares about.\n // If it were to run inside the Angular zone, every test that used Overlay would have to be\n // either async or fakeAsync.\n timeoutId = this._ngZone.runOutsideAngular(() => setTimeout(finishDetach, 500));\n }\n\n /* Toggles a single CSS class or an array of classes on an element. /\n private _toggleClasses(element: HTMLElement, cssClasses: string \| string[], isAdd: boolean) {\n const classList = element.classList;\n\n coerceArray(cssClasses).forEach(cssClass => {\n // We can't do a spread here, because IE doesn't support setting multiple classes.\n // Also trying to add an empty string to a DOMTokenList will throw.\n if (cssClass) {\n isAdd ? classList.add(cssClass) : classList.remove(cssClass);\n }\n });\n }\n\n /* Detaches the overlay content next time the zone stabilizes. /\n private _detachContentWhenStable() {\n // Normally we wouldn't have to explicitly run this outside the `NgZone`, however\n // if the consumer is using `zone-patch-rxjs`, the `Subscription.unsubscribe` call will\n // be patched to run inside the zone, which will throw us into an infinite loop.\n this._ngZone.runOutsideAngular(() => {\n // We can't remove the host here immediately, because the overlay pane's content\n // might still be animating. This stream helps us avoid interrupting the animation\n // by waiting for the pane to become empty.\n const subscription = this._ngZone.onStable\n .pipe(takeUntil(merge(this._attachments, this._detachments)))\n .subscribe(() => {\n // Needs a couple of checks for the pane and host, because\n // they may have been removed by the time the zone stabilizes.\n if (!this._pane \|\| !this._host \|\| this._pane.children.length === 0) {\n if (this._pane && this._config.panelClass) {\n this._toggleClasses(this._pane, this._config.panelClass, false);\n }\n\n if (this._host && this._host.parentElement) {\n this._previousHostParent = this._host.parentElement;\n this._previousHostParent.removeChild(this._host);\n }\n\n subscription.unsubscribe();\n }\n });\n });\n }\n\n /* Disposes of a scroll strategy. /\n private _disposeScrollStrategy() {\n const scrollStrategy = this._scrollStrategy;\n\n if (scrollStrategy) {\n scrollStrategy.disable();\n\n if (scrollStrategy.detach) {\n scrollStrategy.detach();\n }\n }\n }\n\n /* Removes a backdrop element from the DOM. /\n private _disposeBackdrop(backdrop: HTMLElement \| null) {\n if (backdrop) {\n if (backdrop.parentNode) {\n backdrop.parentNode.removeChild(backdrop);\n }\n\n // It is possible that a new portal has been attached to this overlay since we started\n // removing the backdrop. If that is the case, only clear the backdrop reference if it\n // is still the same instance that we started to remove.\n if (this._backdropElement === backdrop) {\n this._backdropElement = null;\n }\n }\n }\n}\n\n\n/* Size properties for an overlay. /\nexport interface OverlaySizeConfig {\n width?: number \| string;\n height?: number \| string;\n minWidth?: number \| string;\n minHeight?: number \| string;\n maxWidth?: number \| string;\n maxHeight?: number \| string;\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {PositionStrategy} from './position-strategy';\nimport {ElementRef} from '@angular/core';\nimport {ViewportRuler, CdkScrollable, ViewportScrollPosition} from '@angular/cdk/scrolling';\nimport {\n ConnectedOverlayPositionChange,\n ConnectionPositionPair,\n ScrollingVisibility,\n validateHorizontalPosition,\n validateVerticalPosition,\n} from './connected-position';\nimport {Observable, Subscription, Subject} from 'rxjs';\nimport {OverlayReference} from '../overlay-reference';\nimport {isElementScrolledOutsideView, isElementClippedByScrolling} from './scroll-clip';\nimport {coerceCssPixelValue, coerceArray} from '@angular/cdk/coercion';\nimport {Platform} from '@angular/cdk/platform';\nimport {OverlayContainer} from '../overlay-container';\n\n// TODO: refactor clipping detection into a separate thing (part of scrolling module)\n// TODO: doesn't handle both flexible width and height when it has to scroll along both axis.\n\n/* Class to be added to the overlay bounding box. /\nconst boundingBoxClass = 'cdk-overlay-connected-position-bounding-box';\n\n/* Regex used to split a string on its CSS units. /\nconst cssUnitPattern = /([A-Za-z%]+)$/;\n\n/* Possible values that can be set as the origin of a FlexibleConnectedPositionStrategy. /\nexport type FlexibleConnectedPositionStrategyOrigin = ElementRef \| Element \| Point & {\n width?: number;\n height?: number;\n};\n\n/\n A strategy for positioning overlays. Using this strategy, an overlay is given an\n * implicit position relative some origin element. The relative position is defined in terms of\n * a point on the origin element that is connected to a point on the overlay element. For example,\n * a basic dropdown is connecting the bottom-left corner of the origin to the top-left corner\n * of the overlay.\n /\nexport class FlexibleConnectedPositionStrategy implements PositionStrategy {\n /* The overlay to which this strategy is attached. /\n private _overlayRef: OverlayReference;\n\n /* Whether we're performing the very first positioning of the overlay. /\n private _isInitialRender: boolean;\n\n /* Last size used for the bounding box. Used to avoid resizing the overlay after open. /\n private _lastBoundingBoxSize = {width: 0, height: 0};\n\n /* Whether the overlay was pushed in a previous positioning. /\n private _isPushed = false;\n\n /* Whether the overlay can be pushed on-screen on the initial open. /\n private _canPush = true;\n\n /* Whether the overlay can grow via flexible width/height after the initial open. /\n private _growAfterOpen = false;\n\n /* Whether the overlay's width and height can be constrained to fit within the viewport. /\n private _hasFlexibleDimensions = true;\n\n /* Whether the overlay position is locked. /\n private _positionLocked = false;\n\n /* Cached origin dimensions /\n private _originRect: ClientRect;\n\n /* Cached overlay dimensions /\n private _overlayRect: ClientRect;\n\n /* Cached viewport dimensions /\n private _viewportRect: ClientRect;\n\n /* Amount of space that must be maintained between the overlay and the edge of the viewport. /\n private _viewportMargin = 0;\n\n /* The Scrollable containers used to check scrollable view properties on position change. /\n private _scrollables: CdkScrollable[] = [];\n\n /* Ordered list of preferred positions, from most to least desirable. /\n _preferredPositions: ConnectionPositionPair[] = [];\n\n /* The origin element against which the overlay will be positioned. /\n private _origin: FlexibleConnectedPositionStrategyOrigin;\n\n /* The overlay pane element. /\n private _pane: HTMLElement;\n\n /* Whether the strategy has been disposed of already. /\n private _isDisposed: boolean;\n\n /\n Parent element for the overlay panel used to constrain the overlay panel's size to fit\n * within the viewport.\n /\n private _boundingBox: HTMLElement \| null;\n\n /* The last position to have been calculated as the best fit position. /\n private _lastPosition: ConnectedPosition \| null;\n\n /* Subject that emits whenever the position changes. /\n private readonly _positionChanges = new Subject<ConnectedOverlayPositionChange>();\n\n /* Subscription to viewport size changes. /\n private _resizeSubscription = Subscription.EMPTY;\n\n /* Default offset for the overlay along the x axis. /\n private _offsetX = 0;\n\n /* Default offset for the overlay along the y axis. /\n private _offsetY = 0;\n\n /* Selector to be used when finding the elements on which to set the transform origin. /\n private _transformOriginSelector: string;\n\n /* Keeps track of the CSS classes that the position strategy has applied on the overlay panel. /\n private _appliedPanelClasses: string[] = [];\n\n /* Amount by which the overlay was pushed in each axis during the last time it was positioned. /\n private _previousPushAmount: {x: number, y: number} \| null;\n\n /* Observable sequence of position changes. /\n positionChanges: Observable<ConnectedOverlayPositionChange> = this._positionChanges;\n\n /* Ordered list of preferred positions, from most to least desirable. /\n get positions(): ConnectionPositionPair[] {\n return this._preferredPositions;\n }\n\n constructor(\n connectedTo: FlexibleConnectedPositionStrategyOrigin, private _viewportRuler: ViewportRuler,\n private _document: Document, private _platform: Platform,\n private _overlayContainer: OverlayContainer) {\n this.setOrigin(connectedTo);\n }\n\n /* Attaches this position strategy to an overlay. /\n attach(overlayRef: OverlayReference): void {\n if (this._overlayRef && overlayRef !== this._overlayRef &&\n (typeof ngDevMode === 'undefined' \|\| ngDevMode)) {\n throw Error('This position strategy is already attached to an overlay');\n }\n\n this._validatePositions();\n\n overlayRef.hostElement.classList.add(boundingBoxClass);\n\n this._overlayRef = overlayRef;\n this._boundingBox = overlayRef.hostElement;\n this._pane = overlayRef.overlayElement;\n this._isDisposed = false;\n this._isInitialRender = true;\n this._lastPosition = null;\n this._resizeSubscription.unsubscribe();\n this._resizeSubscription = this._viewportRuler.change().subscribe(() => {\n // When the window is resized, we want to trigger the next reposition as if it\n // was an initial render, in order for the strategy to pick a new optimal position,\n // otherwise position locking will cause it to stay at the old one.\n this._isInitialRender = true;\n this.apply();\n });\n }\n\n /\n Updates the position of the overlay element, using whichever preferred position relative\n * to the origin best fits on-screen.\n \n The selection of a position goes as follows:\n * - If any positions fit completely within the viewport as-is,\n * choose the first position that does so.\n * - If flexible dimensions are enabled and at least one satifies the given minimum width/height,\n * choose the position with the greatest available size modified by the positions' weight.\n * - If pushing is enabled, take the position that went off-screen the least and push it\n * on-screen.\n * - If none of the previous criteria were met, use the position that goes off-screen the least.\n * @docs-private\n /\n apply(): void {\n // We shouldn't do anything if the strategy was disposed or we're on the server.\n if (this._isDisposed \|\| !this._platform.isBrowser) {\n return;\n }\n\n // If the position has been applied already (e.g. when the overlay was opened) and the\n // consumer opted into locking in the position, re-use the old position, in order to\n // prevent the overlay from jumping around.\n if (!this._isInitialRender && this._positionLocked && this._lastPosition) {\n this.reapplyLastPosition();\n return;\n }\n\n this._clearPanelClasses();\n this._resetOverlayElementStyles();\n this._resetBoundingBoxStyles();\n\n // We need the bounding rects for the origin and the overlay to determine how to position\n // the overlay relative to the origin.\n // We use the viewport rect to determine whether a position would go off-screen.\n this._viewportRect = this._getNarrowedViewportRect();\n this._originRect = this._getOriginRect();\n this._overlayRect = this._pane.getBoundingClientRect();\n\n const originRect = this._originRect;\n const overlayRect = this._overlayRect;\n const viewportRect = this._viewportRect;\n\n // Positions where the overlay will fit with flexible dimensions.\n const flexibleFits: FlexibleFit[] = [];\n\n // Fallback if none of the preferred positions fit within the viewport.\n let fallback: FallbackPosition \| undefined;\n\n // Go through each of the preferred positions looking for a good fit.\n // If a good fit is found, it will be applied immediately.\n for (let pos of this._preferredPositions) {\n // Get the exact (x, y) coordinate for the point-of-origin on the origin element.\n let originPoint = this._getOriginPoint(originRect, pos);\n\n // From that point-of-origin, get the exact (x, y) coordinate for the top-left corner of the\n // overlay in this position. We use the top-left corner for calculations and later translate\n // this into an appropriate (top, left, bottom, right) style.\n let overlayPoint = this._getOverlayPoint(originPoint, overlayRect, pos);\n\n // Calculate how well the overlay would fit into the viewport with this point.\n let overlayFit = this._getOverlayFit(overlayPoint, overlayRect, viewportRect, pos);\n\n // If the overlay, without any further work, fits into the viewport, use this position.\n if (overlayFit.isCompletelyWithinViewport) {\n this._isPushed = false;\n this._applyPosition(pos, originPoint);\n return;\n }\n\n // If the overlay has flexible dimensions, we can use this position\n // so long as there's enough space for the minimum dimensions.\n if (this._canFitWithFlexibleDimensions(overlayFit, overlayPoint, viewportRect)) {\n // Save positions where the overlay will fit with flexible dimensions. We will use these\n // if none of the positions fit without* flexible dimensions.\n flexibleFits.push({\n position: pos,\n origin: originPoint,\n overlayRect,\n boundingBoxRect: this._calculateBoundingBoxRect(originPoint, pos)\n });\n\n continue;\n }\n\n // If the current preferred position does not fit on the screen, remember the position\n // if it has more visible area on-screen than we've seen and move onto the next preferred\n // position.\n if (!fallback \|\| fallback.overlayFit.visibleArea < overlayFit.visibleArea) {\n fallback = {overlayFit, overlayPoint, originPoint, position: pos, overlayRect};\n }\n }\n\n // If there are any positions where the overlay would fit with flexible dimensions, choose the\n // one that has the greatest area available modified by the position's weight\n if (flexibleFits.length) {\n let bestFit: FlexibleFit \| null = null;\n let bestScore = -1;\n for (const fit of flexibleFits) {\n const score =\n fit.boundingBoxRect.width * fit.boundingBoxRect.height * (fit.position.weight \|\| 1);\n if (score > bestScore) {\n bestScore = score;\n bestFit = fit;\n }\n }\n\n this._isPushed = false;\n this._applyPosition(bestFit!.position, bestFit!.origin);\n return;\n }\n\n // When none of the preferred positions fit within the viewport, take the position\n // that went off-screen the least and attempt to push it on-screen.\n if (this._canPush) {\n // TODO(jelbourn): after pushing, the opening \"direction\" of the overlay might not make sense.\n this._isPushed = true;\n this._applyPosition(fallback!.position, fallback!.originPoint);\n return;\n }\n\n // All options for getting the overlay within the viewport have been exhausted, so go with the\n // position that went off-screen the least.\n this._applyPosition(fallback!.position, fallback!.originPoint);\n }\n\n detach(): void {\n this._clearPanelClasses();\n this._lastPosition = null;\n this._previousPushAmount = null;\n this._resizeSubscription.unsubscribe();\n }\n\n /** Cleanup after the element gets destroyed. /\n dispose(): void {\n if (this._isDisposed) {\n return;\n }\n\n // We can't use `_resetBoundingBoxStyles` here, because it resets\n // some properties to zero, rather than removing them.\n if (this._boundingBox) {\n extendStyles(this._boundingBox.style, {\n top: '',\n left: '',\n right: '',\n bottom: '',\n height: '',\n width: '',\n alignItems: '',\n justifyContent: '',\n } as CSSStyleDeclaration);\n }\n\n if (this._pane) {\n this._resetOverlayElementStyles();\n }\n\n if (this._overlayRef) {\n this._overlayRef.hostElement.classList.remove(boundingBoxClass);\n }\n\n this.detach();\n this._positionChanges.complete();\n this._overlayRef = this._boundingBox = null!;\n this._isDisposed = true;\n }\n\n /\n This re-aligns the overlay element with the trigger in its last calculated position,\n * even if a position higher in the \"preferred positions\" list would now fit. This\n * allows one to re-align the panel without changing the orientation of the panel.\n /\n reapplyLastPosition(): void {\n if (!this._isDisposed && (!this._platform \|\| this._platform.isBrowser)) {\n this._originRect = this._getOriginRect();\n this._overlayRect = this._pane.getBoundingClientRect();\n this._viewportRect = this._getNarrowedViewportRect();\n\n const lastPosition = this._lastPosition \|\| this._preferredPositions[0];\n const originPoint = this._getOriginPoint(this._originRect, lastPosition);\n\n this._applyPosition(lastPosition, originPoint);\n }\n }\n\n /\n Sets the list of Scrollable containers that host the origin element so that\n * on reposition we can evaluate if it or the overlay has been clipped or outside view. Every\n * Scrollable must be an ancestor element of the strategy's origin element.\n /\n withScrollableContainers(scrollables: CdkScrollable[]): this {\n this._scrollables = scrollables;\n return this;\n }\n\n /\n Adds new preferred positions.\n * @param positions List of positions options for this overlay.\n /\n withPositions(positions: ConnectedPosition[]): this {\n this._preferredPositions = positions;\n\n // If the last calculated position object isn't part of the positions anymore, clear\n // it in order to avoid it being picked up if the consumer tries to re-apply.\n if (positions.indexOf(this._lastPosition!) === -1) {\n this._lastPosition = null;\n }\n\n this._validatePositions();\n\n return this;\n }\n\n /\n Sets a minimum distance the overlay may be positioned to the edge of the viewport.\n * @param margin Required margin between the overlay and the viewport edge in pixels.\n /\n withViewportMargin(margin: number): this {\n this._viewportMargin = margin;\n return this;\n }\n\n /* Sets whether the overlay's width and height can be constrained to fit within the viewport. /\n withFlexibleDimensions(flexibleDimensions = true): this {\n this._hasFlexibleDimensions = flexibleDimensions;\n return this;\n }\n\n /* Sets whether the overlay can grow after the initial open via flexible width/height. /\n withGrowAfterOpen(growAfterOpen = true): this {\n this._growAfterOpen = growAfterOpen;\n return this;\n }\n\n /* Sets whether the overlay can be pushed on-screen if none of the provided positions fit. /\n withPush(canPush = true): this {\n this._canPush = canPush;\n return this;\n }\n\n /\n Sets whether the overlay's position should be locked in after it is positioned\n * initially. When an overlay is locked in, it won't attempt to reposition itself\n * when the position is re-applied (e.g. when the user scrolls away).\n * @param isLocked Whether the overlay should locked in.\n /\n withLockedPosition(isLocked = true): this {\n this._positionLocked = isLocked;\n return this;\n }\n\n /\n Sets the origin, relative to which to position the overlay.\n * Using an element origin is useful for building components that need to be positioned\n * relatively to a trigger (e.g. dropdown menus or tooltips), whereas using a point can be\n * used for cases like contextual menus which open relative to the user's pointer.\n * @param origin Reference to the new origin.\n /\n setOrigin(origin: FlexibleConnectedPositionStrategyOrigin): this {\n this._origin = origin;\n return this;\n }\n\n /\n Sets the default offset for the overlay's connection point on the x-axis.\n * @param offset New offset in the X axis.\n /\n withDefaultOffsetX(offset: number): this {\n this._offsetX = offset;\n return this;\n }\n\n /\n Sets the default offset for the overlay's connection point on the y-axis.\n * @param offset New offset in the Y axis.\n /\n withDefaultOffsetY(offset: number): this {\n this._offsetY = offset;\n return this;\n }\n\n /\n Configures that the position strategy should set a `transform-origin` on some elements\n * inside the overlay, depending on the current position that is being applied. This is\n * useful for the cases where the origin of an animation can change depending on the\n * alignment of the overlay.\n * @param selector CSS selector that will be used to find the target\n * elements onto which to set the transform origin.\n /\n withTransformOriginOn(selector: string): this {\n this._transformOriginSelector = selector;\n return this;\n }\n\n /\n Gets the (x, y) coordinate of a connection point on the origin based on a relative position.\n /\n private _getOriginPoint(originRect: ClientRect, pos: ConnectedPosition): Point {\n let x: number;\n if (pos.originX == 'center') {\n // Note: when centering we should always use the `left`\n // offset, otherwise the position will be wrong in RTL.\n x = originRect.left + (originRect.width / 2);\n } else {\n const startX = this._isRtl() ? originRect.right : originRect.left;\n const endX = this._isRtl() ? originRect.left : originRect.right;\n x = pos.originX == 'start' ? startX : endX;\n }\n\n let y: number;\n if (pos.originY == 'center') {\n y = originRect.top + (originRect.height / 2);\n } else {\n y = pos.originY == 'top' ? originRect.top : originRect.bottom;\n }\n\n return {x, y};\n }\n\n\n /\n Gets the (x, y) coordinate of the top-left corner of the overlay given a given position and\n * origin point to which the overlay should be connected.\n /\n private _getOverlayPoint(\n originPoint: Point,\n overlayRect: ClientRect,\n pos: ConnectedPosition): Point {\n\n // Calculate the (overlayStartX, overlayStartY), the start of the\n // potential overlay position relative to the origin point.\n let overlayStartX: number;\n if (pos.overlayX == 'center') {\n overlayStartX = -overlayRect.width / 2;\n } else if (pos.overlayX === 'start') {\n overlayStartX = this._isRtl() ? -overlayRect.width : 0;\n } else {\n overlayStartX = this._isRtl() ? 0 : -overlayRect.width;\n }\n\n let overlayStartY: number;\n if (pos.overlayY == 'center') {\n overlayStartY = -overlayRect.height / 2;\n } else {\n overlayStartY = pos.overlayY == 'top' ? 0 : -overlayRect.height;\n }\n\n // The (x, y) coordinates of the overlay.\n return {\n x: originPoint.x + overlayStartX,\n y: originPoint.y + overlayStartY,\n };\n }\n\n /* Gets how well an overlay at the given point will fit within the viewport. /\n private _getOverlayFit(point: Point, rawOverlayRect: ClientRect, viewport: ClientRect,\n position: ConnectedPosition): OverlayFit {\n\n // Round the overlay rect when comparing against the\n // viewport, because the viewport is always rounded.\n const overlay = getRoundedBoundingClientRect(rawOverlayRect);\n let {x, y} = point;\n let offsetX = this._getOffset(position, 'x');\n let offsetY = this._getOffset(position, 'y');\n\n // Account for the offsets since they could push the overlay out of the viewport.\n if (offsetX) {\n x += offsetX;\n }\n\n if (offsetY) {\n y += offsetY;\n }\n\n // How much the overlay would overflow at this position, on each side.\n let leftOverflow = 0 - x;\n let rightOverflow = (x + overlay.width) - viewport.width;\n let topOverflow = 0 - y;\n let bottomOverflow = (y + overlay.height) - viewport.height;\n\n // Visible parts of the element on each axis.\n let visibleWidth = this._subtractOverflows(overlay.width, leftOverflow, rightOverflow);\n let visibleHeight = this._subtractOverflows(overlay.height, topOverflow, bottomOverflow);\n let visibleArea = visibleWidth visibleHeight;\n\n return {\n visibleArea,\n isCompletelyWithinViewport: (overlay.width * overlay.height) === visibleArea,\n fitsInViewportVertically: visibleHeight === overlay.height,\n fitsInViewportHorizontally: visibleWidth == overlay.width,\n };\n }\n\n /*\n Whether the overlay can fit within the viewport when it may resize either its width or height.\n * @param fit How well the overlay fits in the viewport at some position.\n * @param point The (x, y) coordinates of the overlat at some position.\n * @param viewport The geometry of the viewport.\n /\n private _canFitWithFlexibleDimensions(fit: OverlayFit, point: Point, viewport: ClientRect) {\n if (this._hasFlexibleDimensions) {\n const availableHeight = viewport.bottom - point.y;\n const availableWidth = viewport.right - point.x;\n const minHeight = getPixelValue(this._overlayRef.getConfig().minHeight);\n const minWidth = getPixelValue(this._overlayRef.getConfig().minWidth);\n\n const verticalFit = fit.fitsInViewportVertically \|\|\n (minHeight != null && minHeight <= availableHeight);\n const horizontalFit = fit.fitsInViewportHorizontally \|\|\n (minWidth != null && minWidth <= availableWidth);\n\n return verticalFit && horizontalFit;\n }\n return false;\n }\n\n /\n Gets the point at which the overlay can be \"pushed\" on-screen. If the overlay is larger than\n * the viewport, the top-left corner will be pushed on-screen (with overflow occuring on the\n * right and bottom).\n \n @param start Starting point from which the overlay is pushed.\n * @param overlay Dimensions of the overlay.\n * @param scrollPosition Current viewport scroll position.\n * @returns The point at which to position the overlay after pushing. This is effectively a new\n * originPoint.\n /\n private _pushOverlayOnScreen(start: Point,\n rawOverlayRect: ClientRect,\n scrollPosition: ViewportScrollPosition): Point {\n // If the position is locked and we've pushed the overlay already, reuse the previous push\n // amount, rather than pushing it again. If we were to continue pushing, the element would\n // remain in the viewport, which goes against the expectations when position locking is enabled.\n if (this._previousPushAmount && this._positionLocked) {\n return {\n x: start.x + this._previousPushAmount.x,\n y: start.y + this._previousPushAmount.y\n };\n }\n\n // Round the overlay rect when comparing against the\n // viewport, because the viewport is always rounded.\n const overlay = getRoundedBoundingClientRect(rawOverlayRect);\n const viewport = this._viewportRect;\n\n // Determine how much the overlay goes outside the viewport on each\n // side, which we'll use to decide which direction to push it.\n const overflowRight = Math.max(start.x + overlay.width - viewport.width, 0);\n const overflowBottom = Math.max(start.y + overlay.height - viewport.height, 0);\n const overflowTop = Math.max(viewport.top - scrollPosition.top - start.y, 0);\n const overflowLeft = Math.max(viewport.left - scrollPosition.left - start.x, 0);\n\n // Amount by which to push the overlay in each axis such that it remains on-screen.\n let pushX = 0;\n let pushY = 0;\n\n // If the overlay fits completely within the bounds of the viewport, push it from whichever\n // direction is goes off-screen. Otherwise, push the top-left corner such that its in the\n // viewport and allow for the trailing end of the overlay to go out of bounds.\n if (overlay.width <= viewport.width) {\n pushX = overflowLeft \|\| -overflowRight;\n } else {\n pushX = start.x < this._viewportMargin ? (viewport.left - scrollPosition.left) - start.x : 0;\n }\n\n if (overlay.height <= viewport.height) {\n pushY = overflowTop \|\| -overflowBottom;\n } else {\n pushY = start.y < this._viewportMargin ? (viewport.top - scrollPosition.top) - start.y : 0;\n }\n\n this._previousPushAmount = {x: pushX, y: pushY};\n\n return {\n x: start.x + pushX,\n y: start.y + pushY,\n };\n }\n\n /\n Applies a computed position to the overlay and emits a position change.\n * @param position The position preference\n * @param originPoint The point on the origin element where the overlay is connected.\n /\n private _applyPosition(position: ConnectedPosition, originPoint: Point) {\n this._setTransformOrigin(position);\n this._setOverlayElementStyles(originPoint, position);\n this._setBoundingBoxStyles(originPoint, position);\n\n if (position.panelClass) {\n this._addPanelClasses(position.panelClass);\n }\n\n // Save the last connected position in case the position needs to be re-calculated.\n this._lastPosition = position;\n\n // Notify that the position has been changed along with its change properties.\n // We only emit if we've got any subscriptions, because the scroll visibility\n // calculcations can be somewhat expensive.\n if (this._positionChanges.observers.length) {\n const scrollableViewProperties = this._getScrollVisibility();\n const changeEvent = new ConnectedOverlayPositionChange(position, scrollableViewProperties);\n this._positionChanges.next(changeEvent);\n }\n\n this._isInitialRender = false;\n }\n\n /* Sets the transform origin based on the configured selector and the passed-in position. /\n private _setTransformOrigin(position: ConnectedPosition) {\n if (!this._transformOriginSelector) {\n return;\n }\n\n const elements: NodeListOf<HTMLElement> =\n this._boundingBox!.querySelectorAll(this._transformOriginSelector);\n let xOrigin: 'left' \| 'right' \| 'center';\n let yOrigin: 'top' \| 'bottom' \| 'center' = position.overlayY;\n\n if (position.overlayX === 'center') {\n xOrigin = 'center';\n } else if (this._isRtl()) {\n xOrigin = position.overlayX === 'start' ? 'right' : 'left';\n } else {\n xOrigin = position.overlayX === 'start' ? 'left' : 'right';\n }\n\n for (let i = 0; i < elements.length; i++) {\n elements[i].style.transformOrigin = `${xOrigin} ${yOrigin}`;\n }\n }\n\n /\n Gets the position and size of the overlay's sizing container.\n \n This method does no measuring and applies no styles so that we can cheaply compute the\n * bounds for all positions and choose the best fit based on these results.\n /\n private _calculateBoundingBoxRect(origin: Point, position: ConnectedPosition): BoundingBoxRect {\n const viewport = this._viewportRect;\n const isRtl = this._isRtl();\n let height: number, top: number, bottom: number;\n\n if (position.overlayY === 'top') {\n // Overlay is opening \"downward\" and thus is bound by the bottom viewport edge.\n top = origin.y;\n height = viewport.height - top + this._viewportMargin;\n } else if (position.overlayY === 'bottom') {\n // Overlay is opening \"upward\" and thus is bound by the top viewport edge. We need to add\n // the viewport margin back in, because the viewport rect is narrowed down to remove the\n // margin, whereas the `origin` position is calculated based on its `ClientRect`.\n bottom = viewport.height - origin.y + this._viewportMargin 2;\n height = viewport.height - bottom + this._viewportMargin;\n } else {\n // If neither top nor bottom, it means that the overlay is vertically centered on the\n // origin point. Note that we want the position relative to the viewport, rather than\n // the page, which is why we don't use something like `viewport.bottom - origin.y` and\n // `origin.y - viewport.top`.\n const smallestDistanceToViewportEdge =\n Math.min(viewport.bottom - origin.y + viewport.top, origin.y);\n\n const previousHeight = this._lastBoundingBoxSize.height;\n\n height = smallestDistanceToViewportEdge * 2;\n top = origin.y - smallestDistanceToViewportEdge;\n\n if (height > previousHeight && !this._isInitialRender && !this._growAfterOpen) {\n top = origin.y - (previousHeight / 2);\n }\n }\n\n // The overlay is opening 'right-ward' (the content flows to the right).\n const isBoundedByRightViewportEdge =\n (position.overlayX === 'start' && !isRtl) \|\|\n (position.overlayX === 'end' && isRtl);\n\n // The overlay is opening 'left-ward' (the content flows to the left).\n const isBoundedByLeftViewportEdge =\n (position.overlayX === 'end' && !isRtl) \|\|\n (position.overlayX === 'start' && isRtl);\n\n let width: number, left: number, right: number;\n\n if (isBoundedByLeftViewportEdge) {\n right = viewport.width - origin.x + this._viewportMargin;\n width = origin.x - this._viewportMargin;\n } else if (isBoundedByRightViewportEdge) {\n left = origin.x;\n width = viewport.right - origin.x;\n } else {\n // If neither start nor end, it means that the overlay is horizontally centered on the\n // origin point. Note that we want the position relative to the viewport, rather than\n // the page, which is why we don't use something like `viewport.right - origin.x` and\n // `origin.x - viewport.left`.\n const smallestDistanceToViewportEdge =\n Math.min(viewport.right - origin.x + viewport.left, origin.x);\n const previousWidth = this._lastBoundingBoxSize.width;\n\n width = smallestDistanceToViewportEdge * 2;\n left = origin.x - smallestDistanceToViewportEdge;\n\n if (width > previousWidth && !this._isInitialRender && !this._growAfterOpen) {\n left = origin.x - (previousWidth / 2);\n }\n }\n\n return {top: top!, left: left!, bottom: bottom!, right: right!, width, height};\n }\n\n /*\n Sets the position and size of the overlay's sizing wrapper. The wrapper is positioned on the\n * origin's connection point and stetches to the bounds of the viewport.\n \n @param origin The point on the origin element where the overlay is connected.\n * @param position The position preference\n /\n private _setBoundingBoxStyles(origin: Point, position: ConnectedPosition): void {\n const boundingBoxRect = this._calculateBoundingBoxRect(origin, position);\n\n // It's weird if the overlay grows* while scrolling, so we take the last size into account\n // when applying a new size.\n if (!this._isInitialRender && !this._growAfterOpen) {\n boundingBoxRect.height = Math.min(boundingBoxRect.height, this._lastBoundingBoxSize.height);\n boundingBoxRect.width = Math.min(boundingBoxRect.width, this._lastBoundingBoxSize.width);\n }\n\n const styles = {} as CSSStyleDeclaration;\n\n if (this._hasExactPosition()) {\n styles.top = styles.left = '0';\n styles.bottom = styles.right = styles.maxHeight = styles.maxWidth = '';\n styles.width = styles.height = '100%';\n } else {\n const maxHeight = this._overlayRef.getConfig().maxHeight;\n const maxWidth = this._overlayRef.getConfig().maxWidth;\n\n styles.height = coerceCssPixelValue(boundingBoxRect.height);\n styles.top = coerceCssPixelValue(boundingBoxRect.top);\n styles.bottom = coerceCssPixelValue(boundingBoxRect.bottom);\n styles.width = coerceCssPixelValue(boundingBoxRect.width);\n styles.left = coerceCssPixelValue(boundingBoxRect.left);\n styles.right = coerceCssPixelValue(boundingBoxRect.right);\n\n // Push the pane content towards the proper direction.\n if (position.overlayX === 'center') {\n styles.alignItems = 'center';\n } else {\n styles.alignItems = position.overlayX === 'end' ? 'flex-end' : 'flex-start';\n }\n\n if (position.overlayY === 'center') {\n styles.justifyContent = 'center';\n } else {\n styles.justifyContent = position.overlayY === 'bottom' ? 'flex-end' : 'flex-start';\n }\n\n if (maxHeight) {\n styles.maxHeight = coerceCssPixelValue(maxHeight);\n }\n\n if (maxWidth) {\n styles.maxWidth = coerceCssPixelValue(maxWidth);\n }\n }\n\n this._lastBoundingBoxSize = boundingBoxRect;\n\n extendStyles(this._boundingBox!.style, styles);\n }\n\n /** Resets the styles for the bounding box so that a new positioning can be computed. /\n private _resetBoundingBoxStyles() {\n extendStyles(this._boundingBox!.style, {\n top: '0',\n left: '0',\n right: '0',\n bottom: '0',\n height: '',\n width: '',\n alignItems: '',\n justifyContent: '',\n } as CSSStyleDeclaration);\n }\n\n /* Resets the styles for the overlay pane so that a new positioning can be computed. /\n private _resetOverlayElementStyles() {\n extendStyles(this._pane.style, {\n top: '',\n left: '',\n bottom: '',\n right: '',\n position: '',\n transform: '',\n } as CSSStyleDeclaration);\n }\n\n /* Sets positioning styles to the overlay element. /\n private _setOverlayElementStyles(originPoint: Point, position: ConnectedPosition): void {\n const styles = {} as CSSStyleDeclaration;\n const hasExactPosition = this._hasExactPosition();\n const hasFlexibleDimensions = this._hasFlexibleDimensions;\n const config = this._overlayRef.getConfig();\n\n if (hasExactPosition) {\n const scrollPosition = this._viewportRuler.getViewportScrollPosition();\n extendStyles(styles, this._getExactOverlayY(position, originPoint, scrollPosition));\n extendStyles(styles, this._getExactOverlayX(position, originPoint, scrollPosition));\n } else {\n styles.position = 'static';\n }\n\n // Use a transform to apply the offsets. We do this because the `center` positions rely on\n // being in the normal flex flow and setting a `top` / `left` at all will completely throw\n // off the position. We also can't use margins, because they won't have an effect in some\n // cases where the element doesn't have anything to \"push off of\". Finally, this works\n // better both with flexible and non-flexible positioning.\n let transformString = '';\n let offsetX = this._getOffset(position, 'x');\n let offsetY = this._getOffset(position, 'y');\n\n if (offsetX) {\n transformString += `translateX(${offsetX}px) `;\n }\n\n if (offsetY) {\n transformString += `translateY(${offsetY}px)`;\n }\n\n styles.transform = transformString.trim();\n\n // If a maxWidth or maxHeight is specified on the overlay, we remove them. We do this because\n // we need these values to both be set to \"100%\" for the automatic flexible sizing to work.\n // The maxHeight and maxWidth are set on the boundingBox in order to enforce the constraint.\n // Note that this doesn't apply when we have an exact position, in which case we do want to\n // apply them because they'll be cleared from the bounding box.\n if (config.maxHeight) {\n if (hasExactPosition) {\n styles.maxHeight = coerceCssPixelValue(config.maxHeight);\n } else if (hasFlexibleDimensions) {\n styles.maxHeight = '';\n }\n }\n\n if (config.maxWidth) {\n if (hasExactPosition) {\n styles.maxWidth = coerceCssPixelValue(config.maxWidth);\n } else if (hasFlexibleDimensions) {\n styles.maxWidth = '';\n }\n }\n\n extendStyles(this._pane.style, styles);\n }\n\n /* Gets the exact top/bottom for the overlay when not using flexible sizing or when pushing. /\n private _getExactOverlayY(position: ConnectedPosition,\n originPoint: Point,\n scrollPosition: ViewportScrollPosition) {\n // Reset any existing styles. This is necessary in case the\n // preferred position has changed since the last `apply`.\n let styles = {top: '', bottom: ''} as CSSStyleDeclaration;\n let overlayPoint = this._getOverlayPoint(originPoint, this._overlayRect, position);\n\n if (this._isPushed) {\n overlayPoint = this._pushOverlayOnScreen(overlayPoint, this._overlayRect, scrollPosition);\n }\n\n let virtualKeyboardOffset =\n this._overlayContainer.getContainerElement().getBoundingClientRect().top;\n\n // Normally this would be zero, however when the overlay is attached to an input (e.g. in an\n // autocomplete), mobile browsers will shift everything in order to put the input in the middle\n // of the screen and to make space for the virtual keyboard. We need to account for this offset,\n // otherwise our positioning will be thrown off.\n overlayPoint.y -= virtualKeyboardOffset;\n\n // We want to set either `top` or `bottom` based on whether the overlay wants to appear\n // above or below the origin and the direction in which the element will expand.\n if (position.overlayY === 'bottom') {\n // When using `bottom`, we adjust the y position such that it is the distance\n // from the bottom of the viewport rather than the top.\n const documentHeight = this._document.documentElement!.clientHeight;\n styles.bottom = `${documentHeight - (overlayPoint.y + this._overlayRect.height)}px`;\n } else {\n styles.top = coerceCssPixelValue(overlayPoint.y);\n }\n\n return styles;\n }\n\n /* Gets the exact left/right for the overlay when not using flexible sizing or when pushing. /\n private _getExactOverlayX(position: ConnectedPosition,\n originPoint: Point,\n scrollPosition: ViewportScrollPosition) {\n // Reset any existing styles. This is necessary in case the preferred position has\n // changed since the last `apply`.\n let styles = {left: '', right: ''} as CSSStyleDeclaration;\n let overlayPoint = this._getOverlayPoint(originPoint, this._overlayRect, position);\n\n if (this._isPushed) {\n overlayPoint = this._pushOverlayOnScreen(overlayPoint, this._overlayRect, scrollPosition);\n }\n\n // We want to set either `left` or `right` based on whether the overlay wants to appear \"before\"\n // or \"after\" the origin, which determines the direction in which the element will expand.\n // For the horizontal axis, the meaning of \"before\" and \"after\" change based on whether the\n // page is in RTL or LTR.\n let horizontalStyleProperty: 'left' \| 'right';\n\n if (this._isRtl()) {\n horizontalStyleProperty = position.overlayX === 'end' ? 'left' : 'right';\n } else {\n horizontalStyleProperty = position.overlayX === 'end' ? 'right' : 'left';\n }\n\n // When we're setting `right`, we adjust the x position such that it is the distance\n // from the right edge of the viewport rather than the left edge.\n if (horizontalStyleProperty === 'right') {\n const documentWidth = this._document.documentElement!.clientWidth;\n styles.right = `${documentWidth - (overlayPoint.x + this._overlayRect.width)}px`;\n } else {\n styles.left = coerceCssPixelValue(overlayPoint.x);\n }\n\n return styles;\n }\n\n /\n Gets the view properties of the trigger and overlay, including whether they are clipped\n * or completely outside the view of any of the strategy's scrollables.\n /\n private _getScrollVisibility(): ScrollingVisibility {\n // Note: needs fresh rects since the position could've changed.\n const originBounds = this._getOriginRect();\n const overlayBounds = this._pane.getBoundingClientRect();\n\n // TODO(jelbourn): instead of needing all of the client rects for these scrolling containers\n // every time, we should be able to use the scrollTop of the containers if the size of those\n // containers hasn't changed.\n const scrollContainerBounds = this._scrollables.map(scrollable => {\n return scrollable.getElementRef().nativeElement.getBoundingClientRect();\n });\n\n return {\n isOriginClipped: isElementClippedByScrolling(originBounds, scrollContainerBounds),\n isOriginOutsideView: isElementScrolledOutsideView(originBounds, scrollContainerBounds),\n isOverlayClipped: isElementClippedByScrolling(overlayBounds, scrollContainerBounds),\n isOverlayOutsideView: isElementScrolledOutsideView(overlayBounds, scrollContainerBounds),\n };\n }\n\n /* Subtracts the amount that an element is overflowing on an axis from its length. /\n private _subtractOverflows(length: number, ...overflows: number[]): number {\n return overflows.reduce((currentValue: number, currentOverflow: number) => {\n return currentValue - Math.max(currentOverflow, 0);\n }, length);\n }\n\n /* Narrows the given viewport rect by the current _viewportMargin. /\n private _getNarrowedViewportRect(): ClientRect {\n // We recalculate the viewport rect here ourselves, rather than using the ViewportRuler,\n // because we want to use the `clientWidth` and `clientHeight` as the base. The difference\n // being that the client properties don't include the scrollbar, as opposed to `innerWidth`\n // and `innerHeight` that do. This is necessary, because the overlay container uses\n // 100% `width` and `height` which don't include the scrollbar either.\n const width = this._document.documentElement!.clientWidth;\n const height = this._document.documentElement!.clientHeight;\n const scrollPosition = this._viewportRuler.getViewportScrollPosition();\n\n return {\n top: scrollPosition.top + this._viewportMargin,\n left: scrollPosition.left + this._viewportMargin,\n right: scrollPosition.left + width - this._viewportMargin,\n bottom: scrollPosition.top + height - this._viewportMargin,\n width: width - (2 this._viewportMargin),\n height: height - (2 * this._viewportMargin),\n };\n }\n\n /** Whether the we're dealing with an RTL context /\n private _isRtl() {\n return this._overlayRef.getDirection() === 'rtl';\n }\n\n /* Determines whether the overlay uses exact or flexible positioning. /\n private _hasExactPosition() {\n return !this._hasFlexibleDimensions \|\| this._isPushed;\n }\n\n /* Retrieves the offset of a position along the x or y axis. /\n private _getOffset(position: ConnectedPosition, axis: 'x' \| 'y') {\n if (axis === 'x') {\n // We don't do something like `position['offset' + axis]` in\n // order to avoid breking minifiers that rename properties.\n return position.offsetX == null ? this._offsetX : position.offsetX;\n }\n\n return position.offsetY == null ? this._offsetY : position.offsetY;\n }\n\n /* Validates that the current position match the expected values. /\n private _validatePositions(): void {\n if (typeof ngDevMode === 'undefined' \|\| ngDevMode) {\n if (!this._preferredPositions.length) {\n throw Error('FlexibleConnectedPositionStrategy: At least one position is required.');\n }\n\n // TODO(crisbeto): remove these once Angular's template type\n // checking is advanced enough to catch these cases.\n this._preferredPositions.forEach(pair => {\n validateHorizontalPosition('originX', pair.originX);\n validateVerticalPosition('originY', pair.originY);\n validateHorizontalPosition('overlayX', pair.overlayX);\n validateVerticalPosition('overlayY', pair.overlayY);\n });\n }\n }\n\n /* Adds a single CSS class or an array of classes on the overlay panel. /\n private _addPanelClasses(cssClasses: string \| string[]) {\n if (this._pane) {\n coerceArray(cssClasses).forEach(cssClass => {\n if (cssClass !== '' && this._appliedPanelClasses.indexOf(cssClass) === -1) {\n this._appliedPanelClasses.push(cssClass);\n this._pane.classList.add(cssClass);\n }\n });\n }\n }\n\n /* Clears the classes that the position strategy has applied from the overlay panel. /\n private _clearPanelClasses() {\n if (this._pane) {\n this._appliedPanelClasses.forEach(cssClass => {\n this._pane.classList.remove(cssClass);\n });\n this._appliedPanelClasses = [];\n }\n }\n\n /* Returns the ClientRect of the current origin. /\n private _getOriginRect(): ClientRect {\n const origin = this._origin;\n\n if (origin instanceof ElementRef) {\n return origin.nativeElement.getBoundingClientRect();\n }\n\n // Check for Element so SVG elements are also supported.\n if (origin instanceof Element) {\n return origin.getBoundingClientRect();\n }\n\n const width = origin.width \|\| 0;\n const height = origin.height \|\| 0;\n\n // If the origin is a point, return a client rect as if it was a 0x0 element at the point.\n return {\n top: origin.y,\n bottom: origin.y + height,\n left: origin.x,\n right: origin.x + width,\n height,\n width\n };\n }\n}\n\n/* A simple (x, y) coordinate. /\ninterface Point {\n x: number;\n y: number;\n}\n\n/* Record of measurements for how an overlay (at a given position) fits into the viewport. /\ninterface OverlayFit {\n /* Whether the overlay fits completely in the viewport. /\n isCompletelyWithinViewport: boolean;\n\n /* Whether the overlay fits in the viewport on the y-axis. /\n fitsInViewportVertically: boolean;\n\n /* Whether the overlay fits in the viewport on the x-axis. /\n fitsInViewportHorizontally: boolean;\n\n /* The total visible area (in px^2) of the overlay inside the viewport. /\n visibleArea: number;\n}\n\n/* Record of the measurments determining whether an overlay will fit in a specific position. /\ninterface FallbackPosition {\n position: ConnectedPosition;\n originPoint: Point;\n overlayPoint: Point;\n overlayFit: OverlayFit;\n overlayRect: ClientRect;\n}\n\n/* Position and size of the overlay sizing wrapper for a specific position. /\ninterface BoundingBoxRect {\n top: number;\n left: number;\n bottom: number;\n right: number;\n height: number;\n width: number;\n}\n\n/* Record of measures determining how well a given position will fit with flexible dimensions. /\ninterface FlexibleFit {\n position: ConnectedPosition;\n origin: Point;\n overlayRect: ClientRect;\n boundingBoxRect: BoundingBoxRect;\n}\n\n/* A connected position as specified by the user. /\nexport interface ConnectedPosition {\n originX: 'start' \| 'center' \| 'end';\n originY: 'top' \| 'center' \| 'bottom';\n\n overlayX: 'start' \| 'center' \| 'end';\n overlayY: 'top' \| 'center' \| 'bottom';\n\n weight?: number;\n offsetX?: number;\n offsetY?: number;\n panelClass?: string \| string[];\n}\n\n/* Shallow-extends a stylesheet object with another stylesheet object. /\nfunction extendStyles(destination: CSSStyleDeclaration,\n source: CSSStyleDeclaration): CSSStyleDeclaration {\n for (let key in source) {\n if (source.hasOwnProperty(key)) {\n destination[key] = source[key];\n }\n }\n\n return destination;\n}\n\n\n/\n Extracts the pixel value as a number from a value, if it's a number\n * or a CSS pixel string (e.g. `1337px`). Otherwise returns null.\n /\nfunction getPixelValue(input: number\|string\|null\|undefined): number\|null {\n if (typeof input !== 'number' && input != null) {\n const [value, units] = input.split(cssUnitPattern);\n return (!units \|\| units === 'px') ? parseFloat(value) : null;\n }\n\n return input \|\| null;\n}\n\n/\n Gets a version of an element's bounding `ClientRect` where all the values are rounded down to\n * the nearest pixel. This allows us to account for the cases where there may be sub-pixel\n * deviations in the `ClientRect` returned by the browser (e.g. when zoomed in with a percentage\n * size, see #21350).\n /\nfunction getRoundedBoundingClientRect(clientRect: ClientRect): ClientRect {\n return {\n top: Math.floor(clientRect.top),\n right: Math.floor(clientRect.right),\n bottom: Math.floor(clientRect.bottom),\n left: Math.floor(clientRect.left),\n width: Math.floor(clientRect.width),\n height: Math.floor(clientRect.height)\n };\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Direction} from '@angular/cdk/bidi';\nimport {Platform} from '@angular/cdk/platform';\nimport {CdkScrollable, ViewportRuler} from '@angular/cdk/scrolling';\nimport {ElementRef} from '@angular/core';\nimport {Observable} from 'rxjs';\n\nimport {OverlayContainer} from '../overlay-container';\nimport {OverlayReference} from '../overlay-reference';\n\nimport {\n ConnectedOverlayPositionChange,\n ConnectionPositionPair,\n OriginConnectionPosition,\n OverlayConnectionPosition,\n} from './connected-position';\nimport {FlexibleConnectedPositionStrategy} from './flexible-connected-position-strategy';\nimport {PositionStrategy} from './position-strategy';\n\n/\n A strategy for positioning overlays. Using this strategy, an overlay is given an\n * implicit position relative to some origin element. The relative position is defined in terms of\n * a point on the origin element that is connected to a point on the overlay element. For example,\n * a basic dropdown is connecting the bottom-left corner of the origin to the top-left corner\n * of the overlay.\n * @deprecated Use `FlexibleConnectedPositionStrategy` instead.\n * @breaking-change 8.0.0\n /\nexport class ConnectedPositionStrategy implements PositionStrategy {\n /\n Reference to the underlying position strategy to which all the API calls are proxied.\n * @docs-private\n /\n _positionStrategy: FlexibleConnectedPositionStrategy;\n\n /* The overlay to which this strategy is attached. /\n private _overlayRef: OverlayReference;\n\n private _direction: Direction \| null;\n\n /* Ordered list of preferred positions, from most to least desirable. /\n _preferredPositions: ConnectionPositionPair[] = [];\n\n /* Emits an event when the connection point changes. /\n readonly onPositionChange: Observable<ConnectedOverlayPositionChange>;\n\n constructor(\n originPos: OriginConnectionPosition, overlayPos: OverlayConnectionPosition,\n connectedTo: ElementRef<HTMLElement>, viewportRuler: ViewportRuler, document: Document,\n platform: Platform, overlayContainer: OverlayContainer) {\n // Since the `ConnectedPositionStrategy` is deprecated and we don't want to maintain\n // the extra logic, we create an instance of the positioning strategy that has some\n // defaults that make it behave as the old position strategy and to which we'll\n // proxy all of the API calls.\n this._positionStrategy = new FlexibleConnectedPositionStrategy(\n connectedTo, viewportRuler, document, platform, overlayContainer)\n .withFlexibleDimensions(false)\n .withPush(false)\n .withViewportMargin(0);\n\n this.withFallbackPosition(originPos, overlayPos);\n this.onPositionChange = this._positionStrategy.positionChanges;\n }\n\n /* Ordered list of preferred positions, from most to least desirable. /\n get positions(): ConnectionPositionPair[] {\n return this._preferredPositions;\n }\n\n /* Attach this position strategy to an overlay. /\n attach(overlayRef: OverlayReference): void {\n this._overlayRef = overlayRef;\n this._positionStrategy.attach(overlayRef);\n\n if (this._direction) {\n overlayRef.setDirection(this._direction);\n this._direction = null;\n }\n }\n\n /* Disposes all resources used by the position strategy. /\n dispose() {\n this._positionStrategy.dispose();\n }\n\n /* @docs-private /\n detach() {\n this._positionStrategy.detach();\n }\n\n /\n Updates the position of the overlay element, using whichever preferred position relative\n * to the origin fits on-screen.\n * @docs-private\n /\n apply(): void {\n this._positionStrategy.apply();\n }\n\n /\n Re-positions the overlay element with the trigger in its last calculated position,\n * even if a position higher in the \"preferred positions\" list would now fit. This\n * allows one to re-align the panel without changing the orientation of the panel.\n /\n recalculateLastPosition(): void {\n this._positionStrategy.reapplyLastPosition();\n }\n\n /\n Sets the list of Scrollable containers that host the origin element so that\n * on reposition we can evaluate if it or the overlay has been clipped or outside view. Every\n * Scrollable must be an ancestor element of the strategy's origin element.\n /\n withScrollableContainers(scrollables: CdkScrollable[]) {\n this._positionStrategy.withScrollableContainers(scrollables);\n }\n\n /\n Adds a new preferred fallback position.\n * @param originPos\n * @param overlayPos\n /\n withFallbackPosition(\n originPos: OriginConnectionPosition,\n overlayPos: OverlayConnectionPosition,\n offsetX?: number,\n offsetY?: number): this {\n\n const position = new ConnectionPositionPair(originPos, overlayPos, offsetX, offsetY);\n this._preferredPositions.push(position);\n this._positionStrategy.withPositions(this._preferredPositions);\n return this;\n }\n\n /\n Sets the layout direction so the overlay's position can be adjusted to match.\n * @param dir New layout direction.\n /\n withDirection(dir: 'ltr' \| 'rtl'): this {\n // Since the direction might be declared before the strategy is attached,\n // we save the value in a temporary property and we'll transfer it to the\n // overlay ref on attachment.\n if (this._overlayRef) {\n this._overlayRef.setDirection(dir);\n } else {\n this._direction = dir;\n }\n\n return this;\n }\n\n /\n Sets an offset for the overlay's connection point on the x-axis\n * @param offset New offset in the X axis.\n /\n withOffsetX(offset: number): this {\n this._positionStrategy.withDefaultOffsetX(offset);\n return this;\n }\n\n /\n Sets an offset for the overlay's connection point on the y-axis\n * @param offset New offset in the Y axis.\n /\n withOffsetY(offset: number): this {\n this._positionStrategy.withDefaultOffsetY(offset);\n return this;\n }\n\n /\n Sets whether the overlay's position should be locked in after it is positioned\n * initially. When an overlay is locked in, it won't attempt to reposition itself\n * when the position is re-applied (e.g. when the user scrolls away).\n * @param isLocked Whether the overlay should locked in.\n /\n withLockedPosition(isLocked: boolean): this {\n this._positionStrategy.withLockedPosition(isLocked);\n return this;\n }\n\n /\n Overwrites the current set of positions with an array of new ones.\n * @param positions Position pairs to be set on the strategy.\n /\n withPositions(positions: ConnectionPositionPair[]): this {\n this._preferredPositions = positions.slice();\n this._positionStrategy.withPositions(this._preferredPositions);\n return this;\n }\n\n /\n Sets the origin element, relative to which to position the overlay.\n * @param origin Reference to the new origin element.\n /\n setOrigin(origin: ElementRef): this {\n this._positionStrategy.setOrigin(origin);\n return this;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {PositionStrategy} from './position-strategy';\nimport {OverlayReference} from '../overlay-reference';\n\n/* Class to be added to the overlay pane wrapper. /\nconst wrapperClass = 'cdk-global-overlay-wrapper';\n\n/\n A strategy for positioning overlays. Using this strategy, an overlay is given an\n * explicit position relative to the browser's viewport. We use flexbox, instead of\n * transforms, in order to avoid issues with subpixel rendering which can cause the\n * element to become blurry.\n /\nexport class GlobalPositionStrategy implements PositionStrategy {\n /* The overlay to which this strategy is attached. /\n private _overlayRef: OverlayReference;\n private _cssPosition: string = 'static';\n private _topOffset: string = '';\n private _bottomOffset: string = '';\n private _leftOffset: string = '';\n private _rightOffset: string = '';\n private _alignItems: string = '';\n private _justifyContent: string = '';\n private _width: string = '';\n private _height: string = '';\n private _isDisposed: boolean;\n\n attach(overlayRef: OverlayReference): void {\n const config = overlayRef.getConfig();\n\n this._overlayRef = overlayRef;\n\n if (this._width && !config.width) {\n overlayRef.updateSize({width: this._width});\n }\n\n if (this._height && !config.height) {\n overlayRef.updateSize({height: this._height});\n }\n\n overlayRef.hostElement.classList.add(wrapperClass);\n this._isDisposed = false;\n }\n\n /\n Sets the top position of the overlay. Clears any previously set vertical position.\n * @param value New top offset.\n /\n top(value: string = ''): this {\n this._bottomOffset = '';\n this._topOffset = value;\n this._alignItems = 'flex-start';\n return this;\n }\n\n /\n Sets the left position of the overlay. Clears any previously set horizontal position.\n * @param value New left offset.\n /\n left(value: string = ''): this {\n this._rightOffset = '';\n this._leftOffset = value;\n this._justifyContent = 'flex-start';\n return this;\n }\n\n /\n Sets the bottom position of the overlay. Clears any previously set vertical position.\n * @param value New bottom offset.\n /\n bottom(value: string = ''): this {\n this._topOffset = '';\n this._bottomOffset = value;\n this._alignItems = 'flex-end';\n return this;\n }\n\n /\n Sets the right position of the overlay. Clears any previously set horizontal position.\n * @param value New right offset.\n /\n right(value: string = ''): this {\n this._leftOffset = '';\n this._rightOffset = value;\n this._justifyContent = 'flex-end';\n return this;\n }\n\n /\n Sets the overlay width and clears any previously set width.\n * @param value New width for the overlay\n * @deprecated Pass the `width` through the `OverlayConfig`.\n * @breaking-change 8.0.0\n /\n width(value: string = ''): this {\n if (this._overlayRef) {\n this._overlayRef.updateSize({width: value});\n } else {\n this._width = value;\n }\n\n return this;\n }\n\n /\n Sets the overlay height and clears any previously set height.\n * @param value New height for the overlay\n * @deprecated Pass the `height` through the `OverlayConfig`.\n * @breaking-change 8.0.0\n /\n height(value: string = ''): this {\n if (this._overlayRef) {\n this._overlayRef.updateSize({height: value});\n } else {\n this._height = value;\n }\n\n return this;\n }\n\n /\n Centers the overlay horizontally with an optional offset.\n * Clears any previously set horizontal position.\n \n @param offset Overlay offset from the horizontal center.\n /\n centerHorizontally(offset: string = ''): this {\n this.left(offset);\n this._justifyContent = 'center';\n return this;\n }\n\n /\n Centers the overlay vertically with an optional offset.\n * Clears any previously set vertical position.\n \n @param offset Overlay offset from the vertical center.\n /\n centerVertically(offset: string = ''): this {\n this.top(offset);\n this._alignItems = 'center';\n return this;\n }\n\n /\n Apply the position to the element.\n * @docs-private\n /\n apply(): void {\n // Since the overlay ref applies the strategy asynchronously, it could\n // have been disposed before it ends up being applied. If that is the\n // case, we shouldn't do anything.\n if (!this._overlayRef \|\| !this._overlayRef.hasAttached()) {\n return;\n }\n\n const styles = this._overlayRef.overlayElement.style;\n const parentStyles = this._overlayRef.hostElement.style;\n const config = this._overlayRef.getConfig();\n const {width, height, maxWidth, maxHeight} = config;\n const shouldBeFlushHorizontally = (width === '100%' \|\| width === '100vw') &&\n (!maxWidth \|\| maxWidth === '100%' \|\| maxWidth === '100vw');\n const shouldBeFlushVertically = (height === '100%' \|\| height === '100vh') &&\n (!maxHeight \|\| maxHeight === '100%' \|\| maxHeight === '100vh');\n\n styles.position = this._cssPosition;\n styles.marginLeft = shouldBeFlushHorizontally ? '0' : this._leftOffset;\n styles.marginTop = shouldBeFlushVertically ? '0' : this._topOffset;\n styles.marginBottom = this._bottomOffset;\n styles.marginRight = this._rightOffset;\n\n if (shouldBeFlushHorizontally) {\n parentStyles.justifyContent = 'flex-start';\n } else if (this._justifyContent === 'center') {\n parentStyles.justifyContent = 'center';\n } else if (this._overlayRef.getConfig().direction === 'rtl') {\n // In RTL the browser will invert `flex-start` and `flex-end` automatically, but we\n // don't want that because our positioning is explicitly `left` and `right`, hence\n // why we do another inversion to ensure that the overlay stays in the same position.\n // TODO: reconsider this if we add `start` and `end` methods.\n if (this._justifyContent === 'flex-start') {\n parentStyles.justifyContent = 'flex-end';\n } else if (this._justifyContent === 'flex-end') {\n parentStyles.justifyContent = 'flex-start';\n }\n } else {\n parentStyles.justifyContent = this._justifyContent;\n }\n\n parentStyles.alignItems = shouldBeFlushVertically ? 'flex-start' : this._alignItems;\n }\n\n /\n Cleans up the DOM changes from the position strategy.\n * @docs-private\n /\n dispose(): void {\n if (this._isDisposed \|\| !this._overlayRef) {\n return;\n }\n\n const styles = this._overlayRef.overlayElement.style;\n const parent = this._overlayRef.hostElement;\n const parentStyles = parent.style;\n\n parent.classList.remove(wrapperClass);\n parentStyles.justifyContent = parentStyles.alignItems = styles.marginTop =\n styles.marginBottom = styles.marginLeft = styles.marginRight = styles.position = '';\n\n this._overlayRef = null!;\n this._isDisposed = true;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Platform} from '@angular/cdk/platform';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {DOCUMENT} from '@angular/common';\nimport {ElementRef, Inject, Injectable} from '@angular/core';\n\nimport {OverlayContainer} from '../overlay-container';\n\nimport {OriginConnectionPosition, OverlayConnectionPosition} from './connected-position';\nimport {ConnectedPositionStrategy} from './connected-position-strategy';\nimport {\n FlexibleConnectedPositionStrategy,\n FlexibleConnectedPositionStrategyOrigin,\n} from './flexible-connected-position-strategy';\nimport {GlobalPositionStrategy} from './global-position-strategy';\n\n\n/* Builder for overlay position strategy. /\n@Injectable({providedIn: 'root'})\nexport class OverlayPositionBuilder {\n constructor(\n private _viewportRuler: ViewportRuler, @Inject(DOCUMENT) private _document: any,\n private _platform: Platform, private _overlayContainer: OverlayContainer) {}\n\n /\n Creates a global position strategy.\n /\n global(): GlobalPositionStrategy {\n return new GlobalPositionStrategy();\n }\n\n /\n Creates a relative position strategy.\n * @param elementRef\n * @param originPos\n * @param overlayPos\n * @deprecated Use `flexibleConnectedTo` instead.\n * @breaking-change 8.0.0\n /\n connectedTo(\n elementRef: ElementRef,\n originPos: OriginConnectionPosition,\n overlayPos: OverlayConnectionPosition): ConnectedPositionStrategy {\n return new ConnectedPositionStrategy(\n originPos, overlayPos, elementRef, this._viewportRuler, this._document, this._platform,\n this._overlayContainer);\n }\n\n /\n Creates a flexible position strategy.\n * @param origin Origin relative to which to position the overlay.\n /\n flexibleConnectedTo(origin: FlexibleConnectedPositionStrategyOrigin):\n FlexibleConnectedPositionStrategy {\n return new FlexibleConnectedPositionStrategy(origin, this._viewportRuler, this._document,\n this._platform, this._overlayContainer);\n }\n\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Directionality} from '@angular/cdk/bidi';\nimport {DomPortalOutlet} from '@angular/cdk/portal';\nimport {DOCUMENT, Location} from '@angular/common';\nimport {\n ApplicationRef,\n ComponentFactoryResolver,\n Inject,\n Injectable,\n Injector,\n NgZone,\n} from '@angular/core';\nimport {OverlayKeyboardDispatcher} from './dispatchers/overlay-keyboard-dispatcher';\nimport {OverlayOutsideClickDispatcher} from './dispatchers/overlay-outside-click-dispatcher';\nimport {OverlayConfig} from './overlay-config';\nimport {OverlayContainer} from './overlay-container';\nimport {OverlayRef} from './overlay-ref';\nimport {OverlayPositionBuilder} from './position/overlay-position-builder';\nimport {ScrollStrategyOptions} from './scroll/index';\n\n\n/* Next overlay unique ID. /\nlet nextUniqueId = 0;\n\n// Note that Overlay is not* scoped to the app root because of the ComponentFactoryResolver\n// which needs to be different depending on where OverlayModule is imported.\n\n/*\n Service to create Overlays. Overlays are dynamically added pieces of floating UI, meant to be\n * used as a low-level building block for other components. Dialogs, tooltips, menus,\n * selects, etc. can all be built using overlays. The service should primarily be used by authors\n * of re-usable components rather than developers building end-user applications.\n \n An overlay is a PortalOutlet, so any kind of Portal can be loaded into one.\n /\n@Injectable()\nexport class Overlay {\n private _appRef: ApplicationRef;\n\n constructor(\n /* Scrolling strategies that can be used when creating an overlay. /\n public scrollStrategies: ScrollStrategyOptions,\n private _overlayContainer: OverlayContainer,\n private _componentFactoryResolver: ComponentFactoryResolver,\n private _positionBuilder: OverlayPositionBuilder,\n private _keyboardDispatcher: OverlayKeyboardDispatcher,\n private _injector: Injector,\n private _ngZone: NgZone,\n @Inject(DOCUMENT) private _document: any,\n private _directionality: Directionality,\n private _location: Location,\n private _outsideClickDispatcher: OverlayOutsideClickDispatcher) { }\n\n /\n Creates an overlay.\n * @param config Configuration applied to the overlay.\n * @returns Reference to the created overlay.\n /\n create(config?: OverlayConfig): OverlayRef {\n const host = this._createHostElement();\n const pane = this._createPaneElement(host);\n const portalOutlet = this._createPortalOutlet(pane);\n const overlayConfig = new OverlayConfig(config);\n\n overlayConfig.direction = overlayConfig.direction \|\| this._directionality.value;\n\n return new OverlayRef(portalOutlet, host, pane, overlayConfig, this._ngZone,\n this._keyboardDispatcher, this._document, this._location, this._outsideClickDispatcher);\n }\n\n /\n Gets a position builder that can be used, via fluent API,\n * to construct and configure a position strategy.\n * @returns An overlay position builder.\n /\n position(): OverlayPositionBuilder {\n return this._positionBuilder;\n }\n\n /\n Creates the DOM element for an overlay and appends it to the overlay container.\n * @returns Newly-created pane element\n /\n private _createPaneElement(host: HTMLElement): HTMLElement {\n const pane = this._document.createElement('div');\n\n pane.id = `cdk-overlay-${nextUniqueId++}`;\n pane.classList.add('cdk-overlay-pane');\n host.appendChild(pane);\n\n return pane;\n }\n\n /\n Creates the host element that wraps around an overlay\n * and can be used for advanced positioning.\n * @returns Newly-create host element.\n /\n private _createHostElement(): HTMLElement {\n const host = this._document.createElement('div');\n this._overlayContainer.getContainerElement().appendChild(host);\n return host;\n }\n\n /\n Create a DomPortalOutlet into which the overlay content can be loaded.\n * @param pane The DOM element to turn into a portal outlet.\n * @returns A portal outlet for the given DOM element.\n /\n private _createPortalOutlet(pane: HTMLElement): DomPortalOutlet {\n // We have to resolve the ApplicationRef later in order to allow people\n // to use overlay-based providers during app initialization.\n if (!this._appRef) {\n this._appRef = this._injector.get<ApplicationRef>(ApplicationRef);\n }\n\n return new DomPortalOutlet(pane, this._componentFactoryResolver, this._appRef, this._injector,\n this._document);\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Direction, Directionality} from '@angular/cdk/bidi';\nimport {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {ESCAPE, hasModifierKey} from '@angular/cdk/keycodes';\nimport {TemplatePortal} from '@angular/cdk/portal';\nimport {\n Directive,\n ElementRef,\n EventEmitter,\n Inject,\n InjectionToken,\n Input,\n OnChanges,\n OnDestroy,\n Optional,\n Output,\n SimpleChanges,\n TemplateRef,\n ViewContainerRef,\n} from '@angular/core';\nimport {Subscription} from 'rxjs';\nimport {takeWhile} from 'rxjs/operators';\nimport {Overlay} from './overlay';\nimport {OverlayConfig} from './overlay-config';\nimport {OverlayRef} from './overlay-ref';\nimport {ConnectedOverlayPositionChange} from './position/connected-position';\nimport {\n ConnectedPosition,\n FlexibleConnectedPositionStrategy,\n} from './position/flexible-connected-position-strategy';\nimport {\n RepositionScrollStrategy,\n ScrollStrategy,\n} from './scroll/index';\n\n\n/* Default set of positions for the overlay. Follows the behavior of a dropdown. /\nconst defaultPositionList: ConnectedPosition[] = [\n {\n originX: 'start',\n originY: 'bottom',\n overlayX: 'start',\n overlayY: 'top'\n },\n {\n originX: 'start',\n originY: 'top',\n overlayX: 'start',\n overlayY: 'bottom'\n },\n {\n originX: 'end',\n originY: 'top',\n overlayX: 'end',\n overlayY: 'bottom'\n },\n {\n originX: 'end',\n originY: 'bottom',\n overlayX: 'end',\n overlayY: 'top'\n }\n];\n\n/* Injection token that determines the scroll handling while the connected overlay is open. /\nexport const CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY =\n new InjectionToken<() => ScrollStrategy>('cdk-connected-overlay-scroll-strategy');\n\n/\n Directive applied to an element to make it usable as an origin for an Overlay using a\n * ConnectedPositionStrategy.\n /\n@Directive({\n selector: '[cdk-overlay-origin], [overlay-origin], [cdkOverlayOrigin]',\n exportAs: 'cdkOverlayOrigin',\n})\nexport class CdkOverlayOrigin {\n constructor(\n /* Reference to the element on which the directive is applied. /\n public elementRef: ElementRef) { }\n}\n\n\n/\n Directive to facilitate declarative creation of an\n * Overlay using a FlexibleConnectedPositionStrategy.\n /\n@Directive({\n selector: '[cdk-connected-overlay], [connected-overlay], [cdkConnectedOverlay]',\n exportAs: 'cdkConnectedOverlay'\n})\nexport class CdkConnectedOverlay implements OnDestroy, OnChanges {\n private _overlayRef: OverlayRef;\n private _templatePortal: TemplatePortal;\n private _hasBackdrop = false;\n private _lockPosition = false;\n private _growAfterOpen = false;\n private _flexibleDimensions = false;\n private _push = false;\n private _backdropSubscription = Subscription.EMPTY;\n private _attachSubscription = Subscription.EMPTY;\n private _detachSubscription = Subscription.EMPTY;\n private _positionSubscription = Subscription.EMPTY;\n private _offsetX: number;\n private _offsetY: number;\n private _position: FlexibleConnectedPositionStrategy;\n private _scrollStrategyFactory: () => ScrollStrategy;\n\n /* Origin for the connected overlay. /\n @Input('cdkConnectedOverlayOrigin') origin: CdkOverlayOrigin;\n\n /* Registered connected position pairs. /\n @Input('cdkConnectedOverlayPositions') positions: ConnectedPosition[];\n\n /\n This input overrides the positions input if specified. It lets users pass\n * in arbitrary positioning strategies.\n /\n @Input('cdkConnectedOverlayPositionStrategy') positionStrategy: FlexibleConnectedPositionStrategy;\n\n /* The offset in pixels for the overlay connection point on the x-axis /\n @Input('cdkConnectedOverlayOffsetX')\n get offsetX(): number { return this._offsetX; }\n set offsetX(offsetX: number) {\n this._offsetX = offsetX;\n\n if (this._position) {\n this._updatePositionStrategy(this._position);\n }\n }\n\n /* The offset in pixels for the overlay connection point on the y-axis /\n @Input('cdkConnectedOverlayOffsetY')\n get offsetY() { return this._offsetY; }\n set offsetY(offsetY: number) {\n this._offsetY = offsetY;\n\n if (this._position) {\n this._updatePositionStrategy(this._position);\n }\n }\n\n /* The width of the overlay panel. /\n @Input('cdkConnectedOverlayWidth') width: number \| string;\n\n /* The height of the overlay panel. /\n @Input('cdkConnectedOverlayHeight') height: number \| string;\n\n /* The min width of the overlay panel. /\n @Input('cdkConnectedOverlayMinWidth') minWidth: number \| string;\n\n /* The min height of the overlay panel. /\n @Input('cdkConnectedOverlayMinHeight') minHeight: number \| string;\n\n /* The custom class to be set on the backdrop element. /\n @Input('cdkConnectedOverlayBackdropClass') backdropClass: string;\n\n /* The custom class to add to the overlay pane element. /\n @Input('cdkConnectedOverlayPanelClass') panelClass: string \| string[];\n\n /* Margin between the overlay and the viewport edges. /\n @Input('cdkConnectedOverlayViewportMargin') viewportMargin: number = 0;\n\n /* Strategy to be used when handling scroll events while the overlay is open. /\n @Input('cdkConnectedOverlayScrollStrategy') scrollStrategy: ScrollStrategy;\n\n /* Whether the overlay is open. /\n @Input('cdkConnectedOverlayOpen') open: boolean = false;\n\n /* Whether the overlay can be closed by user interaction. /\n @Input('cdkConnectedOverlayDisableClose') disableClose: boolean = false;\n\n /* CSS selector which to set the transform origin. /\n @Input('cdkConnectedOverlayTransformOriginOn') transformOriginSelector: string;\n\n /* Whether or not the overlay should attach a backdrop. /\n @Input('cdkConnectedOverlayHasBackdrop')\n get hasBackdrop() { return this._hasBackdrop; }\n set hasBackdrop(value: any) { this._hasBackdrop = coerceBooleanProperty(value); }\n\n /* Whether or not the overlay should be locked when scrolling. /\n @Input('cdkConnectedOverlayLockPosition')\n get lockPosition() { return this._lockPosition; }\n set lockPosition(value: any) { this._lockPosition = coerceBooleanProperty(value); }\n\n /* Whether the overlay's width and height can be constrained to fit within the viewport. /\n @Input('cdkConnectedOverlayFlexibleDimensions')\n get flexibleDimensions() { return this._flexibleDimensions; }\n set flexibleDimensions(value: boolean) {\n this._flexibleDimensions = coerceBooleanProperty(value);\n }\n\n /* Whether the overlay can grow after the initial open when flexible positioning is turned on. /\n @Input('cdkConnectedOverlayGrowAfterOpen')\n get growAfterOpen() { return this._growAfterOpen; }\n set growAfterOpen(value: boolean) { this._growAfterOpen = coerceBooleanProperty(value); }\n\n /* Whether the overlay can be pushed on-screen if none of the provided positions fit. /\n @Input('cdkConnectedOverlayPush')\n get push() { return this._push; }\n set push(value: boolean) { this._push = coerceBooleanProperty(value); }\n\n /* Event emitted when the backdrop is clicked. /\n @Output() readonly backdropClick = new EventEmitter<MouseEvent>();\n\n /* Event emitted when the position has changed. /\n @Output() readonly positionChange = new EventEmitter<ConnectedOverlayPositionChange>();\n\n /* Event emitted when the overlay has been attached. /\n @Output() readonly attach = new EventEmitter<void>();\n\n /* Event emitted when the overlay has been detached. /\n @Output() readonly detach = new EventEmitter<void>();\n\n /* Emits when there are keyboard events that are targeted at the overlay. /\n @Output() readonly overlayKeydown = new EventEmitter<KeyboardEvent>();\n\n /* Emits when there are mouse outside click events that are targeted at the overlay. /\n @Output() readonly overlayOutsideClick = new EventEmitter<MouseEvent>();\n\n // TODO(jelbourn): inputs for size, scroll behavior, animation, etc.\n\n constructor(\n private _overlay: Overlay,\n templateRef: TemplateRef<any>,\n viewContainerRef: ViewContainerRef,\n @Inject(CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY) scrollStrategyFactory: any,\n @Optional() private _dir: Directionality) {\n this._templatePortal = new TemplatePortal(templateRef, viewContainerRef);\n this._scrollStrategyFactory = scrollStrategyFactory;\n this.scrollStrategy = this._scrollStrategyFactory();\n }\n\n /* The associated overlay reference. /\n get overlayRef(): OverlayRef {\n return this._overlayRef;\n }\n\n /* The element's layout direction. /\n get dir(): Direction {\n return this._dir ? this._dir.value : 'ltr';\n }\n\n ngOnDestroy() {\n this._attachSubscription.unsubscribe();\n this._detachSubscription.unsubscribe();\n this._backdropSubscription.unsubscribe();\n this._positionSubscription.unsubscribe();\n\n if (this._overlayRef) {\n this._overlayRef.dispose();\n }\n }\n\n ngOnChanges(changes: SimpleChanges) {\n if (this._position) {\n this._updatePositionStrategy(this._position);\n this._overlayRef.updateSize({\n width: this.width,\n minWidth: this.minWidth,\n height: this.height,\n minHeight: this.minHeight,\n });\n\n if (changes['origin'] && this.open) {\n this._position.apply();\n }\n }\n\n if (changes['open']) {\n this.open ? this._attachOverlay() : this._detachOverlay();\n }\n }\n\n /* Creates an overlay /\n private _createOverlay() {\n if (!this.positions \|\| !this.positions.length) {\n this.positions = defaultPositionList;\n }\n\n const overlayRef = this._overlayRef = this._overlay.create(this._buildConfig());\n this._attachSubscription = overlayRef.attachments().subscribe(() => this.attach.emit());\n this._detachSubscription = overlayRef.detachments().subscribe(() => this.detach.emit());\n overlayRef.keydownEvents().subscribe((event: KeyboardEvent) => {\n this.overlayKeydown.next(event);\n\n if (event.keyCode === ESCAPE && !this.disableClose && !hasModifierKey(event)) {\n event.preventDefault();\n this._detachOverlay();\n }\n });\n\n this._overlayRef.outsidePointerEvents().subscribe((event: MouseEvent) => {\n this.overlayOutsideClick.next(event);\n });\n }\n\n /* Builds the overlay config based on the directive's inputs /\n private _buildConfig(): OverlayConfig {\n const positionStrategy = this._position =\n this.positionStrategy \|\| this._createPositionStrategy();\n const overlayConfig = new OverlayConfig({\n direction: this._dir,\n positionStrategy,\n scrollStrategy: this.scrollStrategy,\n hasBackdrop: this.hasBackdrop\n });\n\n if (this.width \|\| this.width === 0) {\n overlayConfig.width = this.width;\n }\n\n if (this.height \|\| this.height === 0) {\n overlayConfig.height = this.height;\n }\n\n if (this.minWidth \|\| this.minWidth === 0) {\n overlayConfig.minWidth = this.minWidth;\n }\n\n if (this.minHeight \|\| this.minHeight === 0) {\n overlayConfig.minHeight = this.minHeight;\n }\n\n if (this.backdropClass) {\n overlayConfig.backdropClass = this.backdropClass;\n }\n\n if (this.panelClass) {\n overlayConfig.panelClass = this.panelClass;\n }\n\n return overlayConfig;\n }\n\n /* Updates the state of a position strategy, based on the values of the directive inputs. /\n private _updatePositionStrategy(positionStrategy: FlexibleConnectedPositionStrategy) {\n const positions: ConnectedPosition[] = this.positions.map(currentPosition => ({\n originX: currentPosition.originX,\n originY: currentPosition.originY,\n overlayX: currentPosition.overlayX,\n overlayY: currentPosition.overlayY,\n offsetX: currentPosition.offsetX \|\| this.offsetX,\n offsetY: currentPosition.offsetY \|\| this.offsetY,\n panelClass: currentPosition.panelClass \|\| undefined,\n }));\n\n return positionStrategy\n .setOrigin(this.origin.elementRef)\n .withPositions(positions)\n .withFlexibleDimensions(this.flexibleDimensions)\n .withPush(this.push)\n .withGrowAfterOpen(this.growAfterOpen)\n .withViewportMargin(this.viewportMargin)\n .withLockedPosition(this.lockPosition)\n .withTransformOriginOn(this.transformOriginSelector);\n }\n\n /* Returns the position strategy of the overlay to be set on the overlay config /\n private _createPositionStrategy(): FlexibleConnectedPositionStrategy {\n const strategy = this._overlay.position().flexibleConnectedTo(this.origin.elementRef);\n this._updatePositionStrategy(strategy);\n return strategy;\n }\n\n /* Attaches the overlay and subscribes to backdrop clicks if backdrop exists /\n private _attachOverlay() {\n if (!this._overlayRef) {\n this._createOverlay();\n } else {\n // Update the overlay size, in case the directive's inputs have changed\n this._overlayRef.getConfig().hasBackdrop = this.hasBackdrop;\n }\n\n if (!this._overlayRef.hasAttached()) {\n this._overlayRef.attach(this._templatePortal);\n }\n\n if (this.hasBackdrop) {\n this._backdropSubscription = this._overlayRef.backdropClick().subscribe(event => {\n this.backdropClick.emit(event);\n });\n } else {\n this._backdropSubscription.unsubscribe();\n }\n\n this._positionSubscription.unsubscribe();\n\n // Only subscribe to `positionChanges` if requested, because putting\n // together all the information for it can be expensive.\n if (this.positionChange.observers.length > 0) {\n this._positionSubscription = this._position.positionChanges\n .pipe(takeWhile(() => this.positionChange.observers.length > 0))\n .subscribe(position => {\n this.positionChange.emit(position);\n\n if (this.positionChange.observers.length === 0) {\n this._positionSubscription.unsubscribe();\n }\n });\n }\n }\n\n /* Detaches the overlay and unsubscribes to backdrop clicks if backdrop exists /\n private _detachOverlay() {\n if (this._overlayRef) {\n this._overlayRef.detach();\n }\n\n this._backdropSubscription.unsubscribe();\n this._positionSubscription.unsubscribe();\n }\n\n static ngAcceptInputType_hasBackdrop: BooleanInput;\n static ngAcceptInputType_lockPosition: BooleanInput;\n static ngAcceptInputType_flexibleDimensions: BooleanInput;\n static ngAcceptInputType_growAfterOpen: BooleanInput;\n static ngAcceptInputType_push: BooleanInput;\n}\n\n\n/* @docs-private /\nexport function CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER_FACTORY(overlay: Overlay):\n () => RepositionScrollStrategy {\n return () => overlay.scrollStrategies.reposition();\n}\n\n/* @docs-private /\nexport const CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER = {\n provide: CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY,\n deps: [Overlay],\n useFactory: CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER_FACTORY,\n};\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {BidiModule} from '@angular/cdk/bidi';\nimport {PortalModule} from '@angular/cdk/portal';\nimport {ScrollingModule} from '@angular/cdk/scrolling';\nimport {NgModule} from '@angular/core';\nimport {Overlay} from './overlay';\nimport {\n CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER,\n CdkConnectedOverlay,\n CdkOverlayOrigin,\n} from './overlay-directives';\n\n\n@NgModule({\n imports: [BidiModule, PortalModule, ScrollingModule],\n exports: [CdkConnectedOverlay, CdkOverlayOrigin, ScrollingModule],\n declarations: [CdkConnectedOverlay, CdkOverlayOrigin],\n providers: [\n Overlay,\n CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER,\n ],\n})\nexport class OverlayModule {}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nexport {OverlayOutsideClickDispatcher} from './overlay-outside-click-dispatcher';\nexport {OverlayKeyboardDispatcher} from './overlay-keyboard-dispatcher';\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Injectable, Inject, OnDestroy} from '@angular/core';\nimport {OverlayContainer} from './overlay-container';\nimport {DOCUMENT} from '@angular/common';\nimport {Platform} from '@angular/cdk/platform';\n\n\n/\n Alternative to OverlayContainer that supports correct displaying of overlay elements in\n * Fullscreen mode\n * https://developer.mozilla.org/en-US/docs/Web/API/Element/requestFullScreen\n \n Should be provided in the root component.\n /\n@Injectable({providedIn: 'root'})\nexport class FullscreenOverlayContainer extends OverlayContainer implements OnDestroy {\n private _fullScreenEventName: string \| undefined;\n private _fullScreenListener: () => void;\n\n constructor(@Inject(DOCUMENT) _document: any, platform: Platform) {\n super(_document, platform);\n }\n\n override ngOnDestroy() {\n super.ngOnDestroy();\n\n if (this._fullScreenEventName && this._fullScreenListener) {\n this._document.removeEventListener(this._fullScreenEventName, this._fullScreenListener);\n }\n }\n\n protected override _createContainer(): void {\n super._createContainer();\n this._adjustParentForFullscreenChange();\n this._addFullscreenChangeListener(() => this._adjustParentForFullscreenChange());\n }\n\n private _adjustParentForFullscreenChange(): void {\n if (!this._containerElement) {\n return;\n }\n\n const fullscreenElement = this.getFullscreenElement();\n const parent = fullscreenElement \|\| this._document.body;\n parent.appendChild(this._containerElement);\n }\n\n private _addFullscreenChangeListener(fn: () => void) {\n const eventName = this._getEventName();\n\n if (eventName) {\n if (this._fullScreenListener) {\n this._document.removeEventListener(eventName, this._fullScreenListener);\n }\n\n this._document.addEventListener(eventName, fn);\n this._fullScreenListener = fn;\n }\n }\n\n private _getEventName(): string \| undefined {\n if (!this._fullScreenEventName) {\n const _document = this._document as any;\n\n if (_document.fullscreenEnabled) {\n this._fullScreenEventName = 'fullscreenchange';\n } else if (_document.webkitFullscreenEnabled) {\n this._fullScreenEventName = 'webkitfullscreenchange';\n } else if (_document.mozFullScreenEnabled) {\n this._fullScreenEventName = 'mozfullscreenchange';\n } else if (_document.msFullscreenEnabled) {\n this._fullScreenEventName = 'MSFullscreenChange';\n }\n }\n\n return this._fullScreenEventName;\n }\n\n /\n When the page is put into fullscreen mode, a specific element is specified.\n * Only that element and its children are visible when in fullscreen mode.\n /\n getFullscreenElement(): Element {\n const _document = this._document as any;\n\n return _document.fullscreenElement \|\|\n _document.webkitFullscreenElement \|\|\n _document.mozFullScreenElement \|\|\n _document.msFullscreenElement \|\|\n null;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nexport from './overlay-config';\nexport * from './position/connected-position';\nexport * from './scroll/index';\nexport * from './overlay-module';\nexport * from './dispatchers/index';\nexport {Overlay} from './overlay';\nexport {OverlayContainer} from './overlay-container';\nexport {CdkOverlayOrigin, CdkConnectedOverlay} from './overlay-directives';\nexport {FullscreenOverlayContainer} from './fullscreen-overlay-container';\nexport {OverlayRef, OverlaySizeConfig} from './overlay-ref';\nexport {ViewportRuler} from '@angular/cdk/scrolling';\nexport {ComponentType} from '@angular/cdk/portal';\nexport {OverlayPositionBuilder} from './position/overlay-position-builder';\n\n// Export pre-defined position strategies and interface to build custom ones.\nexport {PositionStrategy} from './position/position-strategy';\nexport {GlobalPositionStrategy} from './position/global-position-strategy';\nexport {ConnectedPositionStrategy} from './position/connected-position-strategy';\nexport {\n ConnectedPosition,\n FlexibleConnectedPositionStrategy,\n FlexibleConnectedPositionStrategyOrigin,\n} from './position/flexible-connected-position-strategy';\n","/*\n Generated bundle index. 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	1	{"version":3,"file":"overlay.js","sources":["../../../../../../src/cdk/overlay/scroll/block-scroll-strategy.ts","../../../../../../src/cdk/overlay/scroll/scroll-strategy.ts","../../../../../../src/cdk/overlay/scroll/close-scroll-strategy.ts","../../../../../../src/cdk/overlay/scroll/noop-scroll-strategy.ts","../../../../../../src/cdk/overlay/position/scroll-clip.ts","../../../../../../src/cdk/overlay/scroll/reposition-scroll-strategy.ts","../../../../../../src/cdk/overlay/scroll/scroll-strategy-options.ts","../../../../../../src/cdk/overlay/scroll/index.ts","../../../../../../src/cdk/overlay/overlay-config.ts","../../../../../../src/cdk/overlay/position/connected-position.ts","../../../../../../src/cdk/overlay/dispatchers/base-overlay-dispatcher.ts","../../../../../../src/cdk/overlay/dispatchers/overlay-keyboard-dispatcher.ts","../../../../../../src/cdk/overlay/dispatchers/overlay-outside-click-dispatcher.ts","../../../../../../src/cdk/overlay/overlay-container.ts","../../../../../../src/cdk/overlay/overlay-ref.ts","../../../../../../src/cdk/overlay/position/flexible-connected-position-strategy.ts","../../../../../../src/cdk/overlay/position/connected-position-strategy.ts","../../../../../../src/cdk/overlay/position/global-position-strategy.ts","../../../../../../src/cdk/overlay/position/overlay-position-builder.ts","../../../../../../src/cdk/overlay/overlay.ts","../../../../../../src/cdk/overlay/overlay-directives.ts","../../../../../../src/cdk/overlay/overlay-module.ts","../../../../../../src/cdk/overlay/dispatchers/index.ts","../../../../../../src/cdk/overlay/fullscreen-overlay-container.ts","../../../../../../src/cdk/overlay/public-api.ts","../../../../../../src/cdk/overlay/index.ts"],"sourcesContent":["/*\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {ScrollStrategy} from './scroll-strategy';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {coerceCssPixelValue} from '@angular/cdk/coercion';\nimport {supportsScrollBehavior} from '@angular/cdk/platform';\n\nconst scrollBehaviorSupported = supportsScrollBehavior();\n\n/\n Strategy that will prevent the user from scrolling while the overlay is visible.\n /\nexport class BlockScrollStrategy implements ScrollStrategy {\n private _previousHTMLStyles = {top: '', left: ''};\n private _previousScrollPosition: {top: number, left: number};\n private _isEnabled = false;\n private _document: Document;\n\n constructor(private _viewportRuler: ViewportRuler, document: any) {\n this._document = document;\n }\n\n /* Attaches this scroll strategy to an overlay. /\n attach() {}\n\n /* Blocks page-level scroll while the attached overlay is open. /\n enable() {\n if (this._canBeEnabled()) {\n const root = this._document.documentElement!;\n\n this._previousScrollPosition = this._viewportRuler.getViewportScrollPosition();\n\n // Cache the previous inline styles in case the user had set them.\n this._previousHTMLStyles.left = root.style.left \|\| '';\n this._previousHTMLStyles.top = root.style.top \|\| '';\n\n // Note: we're using the `html` node, instead of the `body`, because the `body` may\n // have the user agent margin, whereas the `html` is guaranteed not to have one.\n root.style.left = coerceCssPixelValue(-this._previousScrollPosition.left);\n root.style.top = coerceCssPixelValue(-this._previousScrollPosition.top);\n root.classList.add('cdk-global-scrollblock');\n this._isEnabled = true;\n }\n }\n\n /* Unblocks page-level scroll while the attached overlay is open. /\n disable() {\n if (this._isEnabled) {\n const html = this._document.documentElement!;\n const body = this._document.body!;\n const htmlStyle = html.style;\n const bodyStyle = body.style;\n const previousHtmlScrollBehavior = htmlStyle.scrollBehavior \|\| '';\n const previousBodyScrollBehavior = bodyStyle.scrollBehavior \|\| '';\n\n this._isEnabled = false;\n\n htmlStyle.left = this._previousHTMLStyles.left;\n htmlStyle.top = this._previousHTMLStyles.top;\n html.classList.remove('cdk-global-scrollblock');\n\n // Disable user-defined smooth scrolling temporarily while we restore the scroll position.\n // See https://developer.mozilla.org/en-US/docs/Web/CSS/scroll-behavior\n // Note that we don't mutate the property if the browser doesn't support `scroll-behavior`,\n // because it can throw off feature detections in `supportsScrollBehavior` which\n // checks for `'scrollBehavior' in documentElement.style`.\n if (scrollBehaviorSupported) {\n htmlStyle.scrollBehavior = bodyStyle.scrollBehavior = 'auto';\n }\n\n window.scroll(this._previousScrollPosition.left, this._previousScrollPosition.top);\n\n if (scrollBehaviorSupported) {\n htmlStyle.scrollBehavior = previousHtmlScrollBehavior;\n bodyStyle.scrollBehavior = previousBodyScrollBehavior;\n }\n }\n }\n\n private _canBeEnabled(): boolean {\n // Since the scroll strategies can't be singletons, we have to use a global CSS class\n // (`cdk-global-scrollblock`) to make sure that we don't try to disable global\n // scrolling multiple times.\n const html = this._document.documentElement!;\n\n if (html.classList.contains('cdk-global-scrollblock') \|\| this._isEnabled) {\n return false;\n }\n\n const body = this._document.body;\n const viewport = this._viewportRuler.getViewportSize();\n return body.scrollHeight > viewport.height \|\| body.scrollWidth > viewport.width;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {OverlayReference} from '../overlay-reference';\n\n/\n Describes a strategy that will be used by an overlay to handle scroll events while it is open.\n /\nexport interface ScrollStrategy {\n /* Enable this scroll strategy (called when the attached overlay is attached to a portal). /\n enable: () => void;\n\n /* Disable this scroll strategy (called when the attached overlay is detached from a portal). /\n disable: () => void;\n\n /* Attaches this `ScrollStrategy` to an overlay. /\n attach: (overlayRef: OverlayReference) => void;\n\n /* Detaches the scroll strategy from the current overlay. /\n detach?: () => void;\n}\n\n/\n Returns an error to be thrown when attempting to attach an already-attached scroll strategy.\n /\nexport function getMatScrollStrategyAlreadyAttachedError(): Error {\n return Error(`Scroll strategy has already been attached.`);\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\nimport {NgZone} from '@angular/core';\nimport {ScrollStrategy, getMatScrollStrategyAlreadyAttachedError} from './scroll-strategy';\nimport {OverlayReference} from '../overlay-reference';\nimport {Subscription} from 'rxjs';\nimport {ScrollDispatcher, ViewportRuler} from '@angular/cdk/scrolling';\n\n/\n Config options for the CloseScrollStrategy.\n /\nexport interface CloseScrollStrategyConfig {\n /* Amount of pixels the user has to scroll before the overlay is closed. /\n threshold?: number;\n}\n\n/\n Strategy that will close the overlay as soon as the user starts scrolling.\n /\nexport class CloseScrollStrategy implements ScrollStrategy {\n private _scrollSubscription: Subscription\|null = null;\n private _overlayRef: OverlayReference;\n private _initialScrollPosition: number;\n\n constructor(\n private _scrollDispatcher: ScrollDispatcher,\n private _ngZone: NgZone,\n private _viewportRuler: ViewportRuler,\n private _config?: CloseScrollStrategyConfig) {}\n\n /* Attaches this scroll strategy to an overlay. /\n attach(overlayRef: OverlayReference) {\n if (this._overlayRef && (typeof ngDevMode === 'undefined' \|\| ngDevMode)) {\n throw getMatScrollStrategyAlreadyAttachedError();\n }\n\n this._overlayRef = overlayRef;\n }\n\n /* Enables the closing of the attached overlay on scroll. /\n enable() {\n if (this._scrollSubscription) {\n return;\n }\n\n const stream = this._scrollDispatcher.scrolled(0);\n\n if (this._config && this._config.threshold && this._config.threshold > 1) {\n this._initialScrollPosition = this._viewportRuler.getViewportScrollPosition().top;\n\n this._scrollSubscription = stream.subscribe(() => {\n const scrollPosition = this._viewportRuler.getViewportScrollPosition().top;\n\n if (Math.abs(scrollPosition - this._initialScrollPosition) > this._config!.threshold!) {\n this._detach();\n } else {\n this._overlayRef.updatePosition();\n }\n });\n } else {\n this._scrollSubscription = stream.subscribe(this._detach);\n }\n }\n\n /* Disables the closing the attached overlay on scroll. /\n disable() {\n if (this._scrollSubscription) {\n this._scrollSubscription.unsubscribe();\n this._scrollSubscription = null;\n }\n }\n\n detach() {\n this.disable();\n this._overlayRef = null!;\n }\n\n /* Detaches the overlay ref and disables the scroll strategy. /\n private _detach = () => {\n this.disable();\n\n if (this._overlayRef.hasAttached()) {\n this._ngZone.run(() => this._overlayRef.detach());\n }\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {ScrollStrategy} from './scroll-strategy';\n\n/* Scroll strategy that doesn't do anything. /\nexport class NoopScrollStrategy implements ScrollStrategy {\n /* Does nothing, as this scroll strategy is a no-op. /\n enable() { }\n /* Does nothing, as this scroll strategy is a no-op. /\n disable() { }\n /* Does nothing, as this scroll strategy is a no-op. /\n attach() { }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\n// TODO(jelbourn): move this to live with the rest of the scrolling code\n// TODO(jelbourn): someday replace this with IntersectionObservers\n\n/\n Gets whether an element is scrolled outside of view by any of its parent scrolling containers.\n * @param element Dimensions of the element (from getBoundingClientRect)\n * @param scrollContainers Dimensions of element's scrolling containers (from getBoundingClientRect)\n * @returns Whether the element is scrolled out of view\n * @docs-private\n /\nexport function isElementScrolledOutsideView(element: ClientRect, scrollContainers: ClientRect[]) {\n return scrollContainers.some(containerBounds => {\n const outsideAbove = element.bottom < containerBounds.top;\n const outsideBelow = element.top > containerBounds.bottom;\n const outsideLeft = element.right < containerBounds.left;\n const outsideRight = element.left > containerBounds.right;\n\n return outsideAbove \|\| outsideBelow \|\| outsideLeft \|\| outsideRight;\n });\n}\n\n\n/\n Gets whether an element is clipped by any of its scrolling containers.\n * @param element Dimensions of the element (from getBoundingClientRect)\n * @param scrollContainers Dimensions of element's scrolling containers (from getBoundingClientRect)\n * @returns Whether the element is clipped\n * @docs-private\n /\nexport function isElementClippedByScrolling(element: ClientRect, scrollContainers: ClientRect[]) {\n return scrollContainers.some(scrollContainerRect => {\n const clippedAbove = element.top < scrollContainerRect.top;\n const clippedBelow = element.bottom > scrollContainerRect.bottom;\n const clippedLeft = element.left < scrollContainerRect.left;\n const clippedRight = element.right > scrollContainerRect.right;\n\n return clippedAbove \|\| clippedBelow \|\| clippedLeft \|\| clippedRight;\n });\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {NgZone} from '@angular/core';\nimport {Subscription} from 'rxjs';\nimport {ScrollStrategy, getMatScrollStrategyAlreadyAttachedError} from './scroll-strategy';\nimport {OverlayReference} from '../overlay-reference';\nimport {ScrollDispatcher, ViewportRuler} from '@angular/cdk/scrolling';\nimport {isElementScrolledOutsideView} from '../position/scroll-clip';\n\n/\n Config options for the RepositionScrollStrategy.\n /\nexport interface RepositionScrollStrategyConfig {\n /* Time in milliseconds to throttle the scroll events. /\n scrollThrottle?: number;\n\n /* Whether to close the overlay once the user has scrolled away completely. /\n autoClose?: boolean;\n}\n\n/\n Strategy that will update the element position as the user is scrolling.\n /\nexport class RepositionScrollStrategy implements ScrollStrategy {\n private _scrollSubscription: Subscription\|null = null;\n private _overlayRef: OverlayReference;\n\n constructor(\n private _scrollDispatcher: ScrollDispatcher,\n private _viewportRuler: ViewportRuler,\n private _ngZone: NgZone,\n private _config?: RepositionScrollStrategyConfig) { }\n\n /* Attaches this scroll strategy to an overlay. /\n attach(overlayRef: OverlayReference) {\n if (this._overlayRef && (typeof ngDevMode === 'undefined' \|\| ngDevMode)) {\n throw getMatScrollStrategyAlreadyAttachedError();\n }\n\n this._overlayRef = overlayRef;\n }\n\n /* Enables repositioning of the attached overlay on scroll. /\n enable() {\n if (!this._scrollSubscription) {\n const throttle = this._config ? this._config.scrollThrottle : 0;\n\n this._scrollSubscription = this._scrollDispatcher.scrolled(throttle).subscribe(() => {\n this._overlayRef.updatePosition();\n\n // TODO(crisbeto): make `close` on by default once all components can handle it.\n if (this._config && this._config.autoClose) {\n const overlayRect = this._overlayRef.overlayElement.getBoundingClientRect();\n const {width, height} = this._viewportRuler.getViewportSize();\n\n // TODO(crisbeto): include all ancestor scroll containers here once\n // we have a way of exposing the trigger element to the scroll strategy.\n const parentRects = [{width, height, bottom: height, right: width, top: 0, left: 0}];\n\n if (isElementScrolledOutsideView(overlayRect, parentRects)) {\n this.disable();\n this._ngZone.run(() => this._overlayRef.detach());\n }\n }\n });\n }\n }\n\n /* Disables repositioning of the attached overlay on scroll. /\n disable() {\n if (this._scrollSubscription) {\n this._scrollSubscription.unsubscribe();\n this._scrollSubscription = null;\n }\n }\n\n detach() {\n this.disable();\n this._overlayRef = null!;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {ScrollDispatcher, ViewportRuler} from '@angular/cdk/scrolling';\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, NgZone} from '@angular/core';\nimport {BlockScrollStrategy} from './block-scroll-strategy';\nimport {CloseScrollStrategy, CloseScrollStrategyConfig} from './close-scroll-strategy';\nimport {NoopScrollStrategy} from './noop-scroll-strategy';\nimport {\n RepositionScrollStrategy,\n RepositionScrollStrategyConfig,\n} from './reposition-scroll-strategy';\n\n\n/\n Options for how an overlay will handle scrolling.\n \n Users can provide a custom value for `ScrollStrategyOptions` to replace the default\n * behaviors. This class primarily acts as a factory for ScrollStrategy instances.\n /\n@Injectable({providedIn: 'root'})\nexport class ScrollStrategyOptions {\n private _document: Document;\n\n constructor(\n private _scrollDispatcher: ScrollDispatcher,\n private _viewportRuler: ViewportRuler,\n private _ngZone: NgZone,\n @Inject(DOCUMENT) document: any) {\n this._document = document;\n }\n\n /* Do nothing on scroll. /\n noop = () => new NoopScrollStrategy();\n\n /\n Close the overlay as soon as the user scrolls.\n * @param config Configuration to be used inside the scroll strategy.\n /\n close = (config?: CloseScrollStrategyConfig) => new CloseScrollStrategy(this._scrollDispatcher,\n this._ngZone, this._viewportRuler, config)\n\n /* Block scrolling. /\n block = () => new BlockScrollStrategy(this._viewportRuler, this._document);\n\n /\n Update the overlay's position on scroll.\n * @param config Configuration to be used inside the scroll strategy.\n * Allows debouncing the reposition calls.\n /\n reposition = (config?: RepositionScrollStrategyConfig) => new RepositionScrollStrategy(\n this._scrollDispatcher, this._viewportRuler, this._ngZone, config)\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nexport {CdkScrollable, ScrollDispatcher} from '@angular/cdk/scrolling';\n\n// Export pre-defined scroll strategies and interface to build custom ones.\nexport {ScrollStrategy} from './scroll-strategy';\nexport {ScrollStrategyOptions} from './scroll-strategy-options';\nexport {\n RepositionScrollStrategy,\n RepositionScrollStrategyConfig\n} from './reposition-scroll-strategy';\nexport {CloseScrollStrategy} from './close-scroll-strategy';\nexport {NoopScrollStrategy} from './noop-scroll-strategy';\nexport {BlockScrollStrategy} from './block-scroll-strategy';\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {PositionStrategy} from './position/position-strategy';\nimport {Direction, Directionality} from '@angular/cdk/bidi';\nimport {ScrollStrategy, NoopScrollStrategy} from './scroll/index';\n\n\n/* Initial configuration used when creating an overlay. /\nexport class OverlayConfig {\n /* Strategy with which to position the overlay. /\n positionStrategy?: PositionStrategy;\n\n /* Strategy to be used when handling scroll events while the overlay is open. /\n scrollStrategy?: ScrollStrategy = new NoopScrollStrategy();\n\n /* Custom class to add to the overlay pane. /\n panelClass?: string \| string[] = '';\n\n /* Whether the overlay has a backdrop. /\n hasBackdrop?: boolean = false;\n\n /* Custom class to add to the backdrop /\n backdropClass?: string \| string[] = 'cdk-overlay-dark-backdrop';\n\n /* The width of the overlay panel. If a number is provided, pixel units are assumed. /\n width?: number \| string;\n\n /* The height of the overlay panel. If a number is provided, pixel units are assumed. /\n height?: number \| string;\n\n /* The min-width of the overlay panel. If a number is provided, pixel units are assumed. /\n minWidth?: number \| string;\n\n /* The min-height of the overlay panel. If a number is provided, pixel units are assumed. /\n minHeight?: number \| string;\n\n /* The max-width of the overlay panel. If a number is provided, pixel units are assumed. /\n maxWidth?: number \| string;\n\n /* The max-height of the overlay panel. If a number is provided, pixel units are assumed. /\n maxHeight?: number \| string;\n\n /\n Direction of the text in the overlay panel. If a `Directionality` instance\n * is passed in, the overlay will handle changes to its value automatically.\n /\n direction?: Direction \| Directionality;\n\n /\n Whether the overlay should be disposed of when the user goes backwards/forwards in history.\n * Note that this usually doesn't include clicking on links (unless the user is using\n * the `HashLocationStrategy`).\n /\n disposeOnNavigation?: boolean = false;\n\n constructor(config?: OverlayConfig) {\n if (config) {\n // Use `Iterable` instead of `Array` because TypeScript, as of 3.6.3,\n // loses the array generic type in the `for of`. But we also* have to use `Array` because\n // typescript won't iterate over an `Iterable` unless you compile with `--downlevelIteration`\n const configKeys =\n Object.keys(config) as Iterable<keyof OverlayConfig> & (keyof OverlayConfig)[];\n for (const key of configKeys) {\n if (config[key] !== undefined) {\n // TypeScript, as of version 3.5, sees the left-hand-side of this expression\n // as \"I don't know which key this is, so the only valid value is the intersection\n // of all the posible values.\" In this case, that happens to be `undefined`. TypeScript\n // is not smart enough to see that the right-hand-side is actually an access of the same\n // exact type with the same exact key, meaning that the value type must be identical.\n // So we use `any` to work around this.\n this[key] = config[key] as any;\n }\n }\n }\n }\n}\n","/*\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\n/* Horizontal dimension of a connection point on the perimeter of the origin or overlay element. /\nimport {Optional} from '@angular/core';\nexport type HorizontalConnectionPos = 'start' \| 'center' \| 'end';\n\n/* Vertical dimension of a connection point on the perimeter of the origin or overlay element. /\nexport type VerticalConnectionPos = 'top' \| 'center' \| 'bottom';\n\n\n/* A connection point on the origin element. /\nexport interface OriginConnectionPosition {\n originX: HorizontalConnectionPos;\n originY: VerticalConnectionPos;\n}\n\n/* A connection point on the overlay element. /\nexport interface OverlayConnectionPosition {\n overlayX: HorizontalConnectionPos;\n overlayY: VerticalConnectionPos;\n}\n\n/* The points of the origin element and the overlay element to connect. /\nexport class ConnectionPositionPair {\n /* X-axis attachment point for connected overlay origin. Can be 'start', 'end', or 'center'. /\n originX: HorizontalConnectionPos;\n /* Y-axis attachment point for connected overlay origin. Can be 'top', 'bottom', or 'center'. /\n originY: VerticalConnectionPos;\n /* X-axis attachment point for connected overlay. Can be 'start', 'end', or 'center'. /\n overlayX: HorizontalConnectionPos;\n /* Y-axis attachment point for connected overlay. Can be 'top', 'bottom', or 'center'. /\n overlayY: VerticalConnectionPos;\n\n constructor(\n origin: OriginConnectionPosition,\n overlay: OverlayConnectionPosition,\n /* Offset along the X axis. /\n public offsetX?: number,\n /* Offset along the Y axis. /\n public offsetY?: number,\n /* Class(es) to be applied to the panel while this position is active. /\n public panelClass?: string \| string[]) {\n\n this.originX = origin.originX;\n this.originY = origin.originY;\n this.overlayX = overlay.overlayX;\n this.overlayY = overlay.overlayY;\n }\n}\n\n/\n Set of properties regarding the position of the origin and overlay relative to the viewport\n * with respect to the containing Scrollable elements.\n \n The overlay and origin are clipped if any part of their bounding client rectangle exceeds the\n * bounds of any one of the strategy's Scrollable's bounding client rectangle.\n \n The overlay and origin are outside view if there is no overlap between their bounding client\n * rectangle and any one of the strategy's Scrollable's bounding client rectangle.\n \n ----------- -----------\n * \| outside \| \| clipped \|\n * \| view \| --------------------------\n * \| \| \| \| \| \|\n * ---------- \| ----------- \|\n * -------------------------- \| \|\n * \| \| \| Scrollable \|\n * \| \| \| \|\n * \| \| --------------------------\n * \| Scrollable \|\n * \| \|\n * --------------------------\n \n @docs-private\n /\nexport class ScrollingVisibility {\n isOriginClipped: boolean;\n isOriginOutsideView: boolean;\n isOverlayClipped: boolean;\n isOverlayOutsideView: boolean;\n}\n\n/* The change event emitted by the strategy when a fallback position is used. /\nexport class ConnectedOverlayPositionChange {\n constructor(\n /* The position used as a result of this change. /\n public connectionPair: ConnectionPositionPair,\n /* @docs-private /\n @Optional() public scrollableViewProperties: ScrollingVisibility) {}\n}\n\n/\n Validates whether a vertical position property matches the expected values.\n * @param property Name of the property being validated.\n * @param value Value of the property being validated.\n * @docs-private\n /\nexport function validateVerticalPosition(property: string, value: VerticalConnectionPos) {\n if (value !== 'top' && value !== 'bottom' && value !== 'center') {\n throw Error(`ConnectedPosition: Invalid ${property} \"${value}\". ` +\n `Expected \"top\", \"bottom\" or \"center\".`);\n }\n}\n\n/\n Validates whether a horizontal position property matches the expected values.\n * @param property Name of the property being validated.\n * @param value Value of the property being validated.\n * @docs-private\n /\nexport function validateHorizontalPosition(property: string, value: HorizontalConnectionPos) {\n if (value !== 'start' && value !== 'end' && value !== 'center') {\n throw Error(`ConnectedPosition: Invalid ${property} \"${value}\". ` +\n `Expected \"start\", \"end\" or \"center\".`);\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, OnDestroy} from '@angular/core';\nimport {OverlayReference} from '../overlay-reference';\n\n\n/\n Service for dispatching events that land on the body to appropriate overlay ref,\n * if any. It maintains a list of attached overlays to determine best suited overlay based\n * on event target and order of overlay opens.\n /\n@Injectable({providedIn: 'root'})\nexport abstract class BaseOverlayDispatcher implements OnDestroy {\n\n /* Currently attached overlays in the order they were attached. /\n _attachedOverlays: OverlayReference[] = [];\n\n protected _document: Document;\n protected _isAttached: boolean;\n\n constructor(@Inject(DOCUMENT) document: any) {\n this._document = document;\n }\n\n ngOnDestroy(): void {\n this.detach();\n }\n\n /* Add a new overlay to the list of attached overlay refs. /\n add(overlayRef: OverlayReference): void {\n // Ensure that we don't get the same overlay multiple times.\n this.remove(overlayRef);\n this._attachedOverlays.push(overlayRef);\n }\n\n /* Remove an overlay from the list of attached overlay refs. /\n remove(overlayRef: OverlayReference): void {\n const index = this._attachedOverlays.indexOf(overlayRef);\n\n if (index > -1) {\n this._attachedOverlays.splice(index, 1);\n }\n\n // Remove the global listener once there are no more overlays.\n if (this._attachedOverlays.length === 0) {\n this.detach();\n }\n }\n\n /* Detaches the global event listener. /\n protected abstract detach(): void;\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable} from '@angular/core';\nimport {OverlayReference} from '../overlay-reference';\nimport {BaseOverlayDispatcher} from './base-overlay-dispatcher';\n\n\n/\n Service for dispatching keyboard events that land on the body to appropriate overlay ref,\n * if any. It maintains a list of attached overlays to determine best suited overlay based\n * on event target and order of overlay opens.\n /\n@Injectable({providedIn: 'root'})\nexport class OverlayKeyboardDispatcher extends BaseOverlayDispatcher {\n\n constructor(@Inject(DOCUMENT) document: any) {\n super(document);\n }\n\n /* Add a new overlay to the list of attached overlay refs. /\n override add(overlayRef: OverlayReference): void {\n super.add(overlayRef);\n\n // Lazily start dispatcher once first overlay is added\n if (!this._isAttached) {\n this._document.body.addEventListener('keydown', this._keydownListener);\n this._isAttached = true;\n }\n }\n\n /* Detaches the global keyboard event listener. /\n protected detach() {\n if (this._isAttached) {\n this._document.body.removeEventListener('keydown', this._keydownListener);\n this._isAttached = false;\n }\n }\n\n /* Keyboard event listener that will be attached to the body. /\n private _keydownListener = (event: KeyboardEvent) => {\n const overlays = this._attachedOverlays;\n\n for (let i = overlays.length - 1; i > -1; i--) {\n // Dispatch the keydown event to the top overlay which has subscribers to its keydown events.\n // We want to target the most recent overlay, rather than trying to match where the event came\n // from, because some components might open an overlay, but keep focus on a trigger element\n // (e.g. for select and autocomplete). We skip overlays without keydown event subscriptions,\n // because we don't want overlays that don't handle keyboard events to block the ones below\n // them that do.\n if (overlays[i]._keydownEvents.observers.length > 0) {\n overlays[i]._keydownEvents.next(event);\n break;\n }\n }\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable} from '@angular/core';\nimport {OverlayReference} from '../overlay-reference';\nimport {Platform, _getEventTarget} from '@angular/cdk/platform';\nimport {BaseOverlayDispatcher} from './base-overlay-dispatcher';\n\n/\n Service for dispatching mouse click events that land on the body to appropriate overlay ref,\n * if any. It maintains a list of attached overlays to determine best suited overlay based\n * on event target and order of overlay opens.\n /\n@Injectable({providedIn: 'root'})\nexport class OverlayOutsideClickDispatcher extends BaseOverlayDispatcher {\n private _cursorOriginalValue: string;\n private _cursorStyleIsSet = false;\n private _pointerDownEventTarget: EventTarget \| null;\n\n constructor(@Inject(DOCUMENT) document: any, private _platform: Platform) {\n super(document);\n }\n\n /* Add a new overlay to the list of attached overlay refs. /\n override add(overlayRef: OverlayReference): void {\n super.add(overlayRef);\n\n // Safari on iOS does not generate click events for non-interactive\n // elements. However, we want to receive a click for any element outside\n // the overlay. We can force a \"clickable\" state by setting\n // `cursor: pointer` on the document body. See:\n // https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event#Safari_Mobile\n // https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html\n if (!this._isAttached) {\n const body = this._document.body;\n body.addEventListener('pointerdown', this._pointerDownListener, true);\n body.addEventListener('click', this._clickListener, true);\n body.addEventListener('auxclick', this._clickListener, true);\n body.addEventListener('contextmenu', this._clickListener, true);\n\n // click event is not fired on iOS. To make element \"clickable\" we are\n // setting the cursor to pointer\n if (this._platform.IOS && !this._cursorStyleIsSet) {\n this._cursorOriginalValue = body.style.cursor;\n body.style.cursor = 'pointer';\n this._cursorStyleIsSet = true;\n }\n\n this._isAttached = true;\n }\n }\n\n /* Detaches the global keyboard event listener. /\n protected detach() {\n if (this._isAttached) {\n const body = this._document.body;\n body.removeEventListener('pointerdown', this._pointerDownListener, true);\n body.removeEventListener('click', this._clickListener, true);\n body.removeEventListener('auxclick', this._clickListener, true);\n body.removeEventListener('contextmenu', this._clickListener, true);\n if (this._platform.IOS && this._cursorStyleIsSet) {\n body.style.cursor = this._cursorOriginalValue;\n this._cursorStyleIsSet = false;\n }\n this._isAttached = false;\n }\n }\n\n /* Store pointerdown event target to track origin of click. /\n private _pointerDownListener = (event: PointerEvent) => {\n this._pointerDownEventTarget = _getEventTarget(event);\n }\n\n /* Click event listener that will be attached to the body propagate phase. /\n private _clickListener = (event: MouseEvent) => {\n const target = _getEventTarget(event);\n // In case of a click event, we want to check the origin of the click\n // (e.g. in case where a user starts a click inside the overlay and\n // releases the click outside of it).\n // This is done by using the event target of the preceding pointerdown event.\n // Every click event caused by a pointer device has a preceding pointerdown\n // event, unless the click was programmatically triggered (e.g. in a unit test).\n const origin = event.type === 'click' && this._pointerDownEventTarget\n ? this._pointerDownEventTarget : target;\n // Reset the stored pointerdown event target, to avoid having it interfere\n // in subsequent events.\n this._pointerDownEventTarget = null;\n\n // We copy the array because the original may be modified asynchronously if the\n // outsidePointerEvents listener decides to detach overlays resulting in index errors inside\n // the for loop.\n const overlays = this._attachedOverlays.slice();\n\n // Dispatch the mouse event to the top overlay which has subscribers to its mouse events.\n // We want to target all overlays for which the click could be considered as outside click.\n // As soon as we reach an overlay for which the click is not outside click we break off\n // the loop.\n for (let i = overlays.length - 1; i > -1; i--) {\n const overlayRef = overlays[i];\n if (overlayRef._outsidePointerEvents.observers.length < 1 \|\| !overlayRef.hasAttached()) {\n continue;\n }\n\n // If it's a click inside the overlay, just break - we should do nothing\n // If it's an outside click (both origin and target of the click) dispatch the mouse event,\n // and proceed with the next overlay\n if (overlayRef.overlayElement.contains(target as Node) \|\|\n overlayRef.overlayElement.contains(origin as Node)) {\n break;\n }\n\n overlayRef._outsidePointerEvents.next(event);\n }\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, OnDestroy} from '@angular/core';\nimport {Platform, _isTestEnvironment} from '@angular/cdk/platform';\n\n/* Container inside which all overlays will render. /\n@Injectable({providedIn: 'root'})\nexport class OverlayContainer implements OnDestroy {\n protected _containerElement: HTMLElement;\n protected _document: Document;\n\n constructor(@Inject(DOCUMENT) document: any, protected _platform: Platform) {\n this._document = document;\n }\n\n ngOnDestroy() {\n const container = this._containerElement;\n\n if (container && container.parentNode) {\n container.parentNode.removeChild(container);\n }\n }\n\n /\n This method returns the overlay container element. It will lazily\n * create the element the first time it is called to facilitate using\n * the container in non-browser environments.\n * @returns the container element\n /\n getContainerElement(): HTMLElement {\n if (!this._containerElement) {\n this._createContainer();\n }\n\n return this._containerElement;\n }\n\n /\n Create the overlay container element, which is simply a div\n * with the 'cdk-overlay-container' class on the document body.\n /\n protected _createContainer(): void {\n const containerClass = 'cdk-overlay-container';\n\n // TODO(crisbeto): remove the testing check once we have an overlay testing\n // module or Angular starts tearing down the testing `NgModule`. See:\n // https://github.com/angular/angular/issues/18831\n if (this._platform.isBrowser \|\| _isTestEnvironment()) {\n const oppositePlatformContainers =\n this._document.querySelectorAll(`.${containerClass}[platform=\"server\"], ` +\n `.${containerClass}[platform=\"test\"]`);\n\n // Remove any old containers from the opposite platform.\n // This can happen when transitioning from the server to the client.\n for (let i = 0; i < oppositePlatformContainers.length; i++) {\n oppositePlatformContainers[i].parentNode!.removeChild(oppositePlatformContainers[i]);\n }\n }\n\n const container = this._document.createElement('div');\n container.classList.add(containerClass);\n\n // A long time ago we kept adding new overlay containers whenever a new app was instantiated,\n // but at some point we added logic which clears the duplicate ones in order to avoid leaks.\n // The new logic was a little too aggressive since it was breaking some legitimate use cases.\n // To mitigate the problem we made it so that only containers from a different platform are\n // cleared, but the side-effect was that people started depending on the overly-aggressive\n // logic to clean up their tests for them. Until we can introduce an overlay-specific testing\n // module which does the cleanup, we try to detect that we're in a test environment and we\n // always clear the container. See #17006.\n // TODO(crisbeto): remove the test environment check once we have an overlay testing module.\n if (_isTestEnvironment()) {\n container.setAttribute('platform', 'test');\n } else if (!this._platform.isBrowser) {\n container.setAttribute('platform', 'server');\n }\n\n this._document.body.appendChild(container);\n this._containerElement = container;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Direction, Directionality} from '@angular/cdk/bidi';\nimport {ComponentPortal, Portal, PortalOutlet, TemplatePortal} from '@angular/cdk/portal';\nimport {ComponentRef, EmbeddedViewRef, NgZone} from '@angular/core';\nimport {Location} from '@angular/common';\nimport {Observable, Subject, merge, SubscriptionLike, Subscription} from 'rxjs';\nimport {take, takeUntil} from 'rxjs/operators';\nimport {OverlayKeyboardDispatcher} from './dispatchers/overlay-keyboard-dispatcher';\nimport {OverlayOutsideClickDispatcher} from './dispatchers/overlay-outside-click-dispatcher';\nimport {OverlayConfig} from './overlay-config';\nimport {coerceCssPixelValue, coerceArray} from '@angular/cdk/coercion';\nimport {OverlayReference} from './overlay-reference';\nimport {PositionStrategy} from './position/position-strategy';\nimport {ScrollStrategy} from './scroll';\n\n\n/* An object where all of its properties cannot be written. /\nexport type ImmutableObject<T> = {\n readonly [P in keyof T]: T[P];\n};\n\n/\n Reference to an overlay that has been created with the Overlay service.\n * Used to manipulate or dispose of said overlay.\n /\nexport class OverlayRef implements PortalOutlet, OverlayReference {\n private _backdropElement: HTMLElement \| null = null;\n private readonly _backdropClick = new Subject<MouseEvent>();\n private readonly _attachments = new Subject<void>();\n private readonly _detachments = new Subject<void>();\n private _positionStrategy: PositionStrategy \| undefined;\n private _scrollStrategy: ScrollStrategy \| undefined;\n private _locationChanges: SubscriptionLike = Subscription.EMPTY;\n private _backdropClickHandler = (event: MouseEvent) => this._backdropClick.next(event);\n\n /\n Reference to the parent of the `_host` at the time it was detached. Used to restore\n * the `_host` to its original position in the DOM when it gets re-attached.\n /\n private _previousHostParent: HTMLElement;\n\n /* Stream of keydown events dispatched to this overlay. /\n readonly _keydownEvents = new Subject<KeyboardEvent>();\n\n /* Stream of mouse outside events dispatched to this overlay. /\n readonly _outsidePointerEvents = new Subject<MouseEvent>();\n\n constructor(\n private _portalOutlet: PortalOutlet,\n private _host: HTMLElement,\n private _pane: HTMLElement,\n private _config: ImmutableObject<OverlayConfig>,\n private _ngZone: NgZone,\n private _keyboardDispatcher: OverlayKeyboardDispatcher,\n private _document: Document,\n private _location: Location,\n private _outsideClickDispatcher: OverlayOutsideClickDispatcher) {\n\n if (_config.scrollStrategy) {\n this._scrollStrategy = _config.scrollStrategy;\n this._scrollStrategy.attach(this);\n }\n\n this._positionStrategy = _config.positionStrategy;\n }\n\n /* The overlay's HTML element /\n get overlayElement(): HTMLElement {\n return this._pane;\n }\n\n /* The overlay's backdrop HTML element. /\n get backdropElement(): HTMLElement \| null {\n return this._backdropElement;\n }\n\n /\n Wrapper around the panel element. Can be used for advanced\n * positioning where a wrapper with specific styling is\n * required around the overlay pane.\n /\n get hostElement(): HTMLElement {\n return this._host;\n }\n\n attach<T>(portal: ComponentPortal<T>): ComponentRef<T>;\n attach<T>(portal: TemplatePortal<T>): EmbeddedViewRef<T>;\n attach(portal: any): any;\n\n /\n Attaches content, given via a Portal, to the overlay.\n * If the overlay is configured to have a backdrop, it will be created.\n \n @param portal Portal instance to which to attach the overlay.\n * @returns The portal attachment result.\n /\n attach(portal: Portal<any>): any {\n let attachResult = this._portalOutlet.attach(portal);\n\n // Update the pane element with the given configuration.\n if (!this._host.parentElement && this._previousHostParent) {\n this._previousHostParent.appendChild(this._host);\n }\n\n if (this._positionStrategy) {\n this._positionStrategy.attach(this);\n }\n\n this._updateStackingOrder();\n this._updateElementSize();\n this._updateElementDirection();\n\n if (this._scrollStrategy) {\n this._scrollStrategy.enable();\n }\n\n // Update the position once the zone is stable so that the overlay will be fully rendered\n // before attempting to position it, as the position may depend on the size of the rendered\n // content.\n this._ngZone.onStable\n .pipe(take(1))\n .subscribe(() => {\n // The overlay could've been detached before the zone has stabilized.\n if (this.hasAttached()) {\n this.updatePosition();\n }\n });\n\n // Enable pointer events for the overlay pane element.\n this._togglePointerEvents(true);\n\n if (this._config.hasBackdrop) {\n this._attachBackdrop();\n }\n\n if (this._config.panelClass) {\n this._toggleClasses(this._pane, this._config.panelClass, true);\n }\n\n // Only emit the `attachments` event once all other setup is done.\n this._attachments.next();\n\n // Track this overlay by the keyboard dispatcher\n this._keyboardDispatcher.add(this);\n\n if (this._config.disposeOnNavigation) {\n this._locationChanges = this._location.subscribe(() => this.dispose());\n }\n\n this._outsideClickDispatcher.add(this);\n return attachResult;\n }\n\n /\n Detaches an overlay from a portal.\n * @returns The portal detachment result.\n /\n detach(): any {\n if (!this.hasAttached()) {\n return;\n }\n\n this.detachBackdrop();\n\n // When the overlay is detached, the pane element should disable pointer events.\n // This is necessary because otherwise the pane element will cover the page and disable\n // pointer events therefore. Depends on the position strategy and the applied pane boundaries.\n this._togglePointerEvents(false);\n\n if (this._positionStrategy && this._positionStrategy.detach) {\n this._positionStrategy.detach();\n }\n\n if (this._scrollStrategy) {\n this._scrollStrategy.disable();\n }\n\n const detachmentResult = this._portalOutlet.detach();\n\n // Only emit after everything is detached.\n this._detachments.next();\n\n // Remove this overlay from keyboard dispatcher tracking.\n this._keyboardDispatcher.remove(this);\n\n // Keeping the host element in the DOM can cause scroll jank, because it still gets\n // rendered, even though it's transparent and unclickable which is why we remove it.\n this._detachContentWhenStable();\n this._locationChanges.unsubscribe();\n this._outsideClickDispatcher.remove(this);\n return detachmentResult;\n }\n\n /* Cleans up the overlay from the DOM. /\n dispose(): void {\n const isAttached = this.hasAttached();\n\n if (this._positionStrategy) {\n this._positionStrategy.dispose();\n }\n\n this._disposeScrollStrategy();\n this._disposeBackdrop(this._backdropElement);\n this._locationChanges.unsubscribe();\n this._keyboardDispatcher.remove(this);\n this._portalOutlet.dispose();\n this._attachments.complete();\n this._backdropClick.complete();\n this._keydownEvents.complete();\n this._outsidePointerEvents.complete();\n this._outsideClickDispatcher.remove(this);\n\n if (this._host && this._host.parentNode) {\n this._host.parentNode.removeChild(this._host);\n this._host = null!;\n }\n\n this._previousHostParent = this._pane = null!;\n\n if (isAttached) {\n this._detachments.next();\n }\n\n this._detachments.complete();\n }\n\n /* Whether the overlay has attached content. /\n hasAttached(): boolean {\n return this._portalOutlet.hasAttached();\n }\n\n /* Gets an observable that emits when the backdrop has been clicked. /\n backdropClick(): Observable<MouseEvent> {\n return this._backdropClick;\n }\n\n /* Gets an observable that emits when the overlay has been attached. /\n attachments(): Observable<void> {\n return this._attachments;\n }\n\n /* Gets an observable that emits when the overlay has been detached. /\n detachments(): Observable<void> {\n return this._detachments;\n }\n\n /* Gets an observable of keydown events targeted to this overlay. /\n keydownEvents(): Observable<KeyboardEvent> {\n return this._keydownEvents;\n }\n\n /* Gets an observable of pointer events targeted outside this overlay. /\n outsidePointerEvents(): Observable<MouseEvent> {\n return this._outsidePointerEvents;\n }\n\n /* Gets the current overlay configuration, which is immutable. /\n getConfig(): OverlayConfig {\n return this._config;\n }\n\n /* Updates the position of the overlay based on the position strategy. /\n updatePosition(): void {\n if (this._positionStrategy) {\n this._positionStrategy.apply();\n }\n }\n\n /* Switches to a new position strategy and updates the overlay position. /\n updatePositionStrategy(strategy: PositionStrategy): void {\n if (strategy === this._positionStrategy) {\n return;\n }\n\n if (this._positionStrategy) {\n this._positionStrategy.dispose();\n }\n\n this._positionStrategy = strategy;\n\n if (this.hasAttached()) {\n strategy.attach(this);\n this.updatePosition();\n }\n }\n\n /* Update the size properties of the overlay. /\n updateSize(sizeConfig: OverlaySizeConfig): void {\n this._config = {...this._config, ...sizeConfig};\n this._updateElementSize();\n }\n\n /* Sets the LTR/RTL direction for the overlay. /\n setDirection(dir: Direction \| Directionality): void {\n this._config = {...this._config, direction: dir};\n this._updateElementDirection();\n }\n\n /* Add a CSS class or an array of classes to the overlay pane. /\n addPanelClass(classes: string \| string[]): void {\n if (this._pane) {\n this._toggleClasses(this._pane, classes, true);\n }\n }\n\n /* Remove a CSS class or an array of classes from the overlay pane. /\n removePanelClass(classes: string \| string[]): void {\n if (this._pane) {\n this._toggleClasses(this._pane, classes, false);\n }\n }\n\n /\n Returns the layout direction of the overlay panel.\n /\n getDirection(): Direction {\n const direction = this._config.direction;\n\n if (!direction) {\n return 'ltr';\n }\n\n return typeof direction === 'string' ? direction : direction.value;\n }\n\n /* Switches to a new scroll strategy. /\n updateScrollStrategy(strategy: ScrollStrategy): void {\n if (strategy === this._scrollStrategy) {\n return;\n }\n\n this._disposeScrollStrategy();\n this._scrollStrategy = strategy;\n\n if (this.hasAttached()) {\n strategy.attach(this);\n strategy.enable();\n }\n }\n\n /* Updates the text direction of the overlay panel. /\n private _updateElementDirection() {\n this._host.setAttribute('dir', this.getDirection());\n }\n\n /* Updates the size of the overlay element based on the overlay config. /\n private _updateElementSize() {\n if (!this._pane) {\n return;\n }\n\n const style = this._pane.style;\n\n style.width = coerceCssPixelValue(this._config.width);\n style.height = coerceCssPixelValue(this._config.height);\n style.minWidth = coerceCssPixelValue(this._config.minWidth);\n style.minHeight = coerceCssPixelValue(this._config.minHeight);\n style.maxWidth = coerceCssPixelValue(this._config.maxWidth);\n style.maxHeight = coerceCssPixelValue(this._config.maxHeight);\n }\n\n /* Toggles the pointer events for the overlay pane element. /\n private _togglePointerEvents(enablePointer: boolean) {\n this._pane.style.pointerEvents = enablePointer ? '' : 'none';\n }\n\n /* Attaches a backdrop for this overlay. /\n private _attachBackdrop() {\n const showingClass = 'cdk-overlay-backdrop-showing';\n\n this._backdropElement = this._document.createElement('div');\n this._backdropElement.classList.add('cdk-overlay-backdrop');\n\n if (this._config.backdropClass) {\n this._toggleClasses(this._backdropElement, this._config.backdropClass, true);\n }\n\n // Insert the backdrop before the pane in the DOM order,\n // in order to handle stacked overlays properly.\n this._host.parentElement!.insertBefore(this._backdropElement, this._host);\n\n // Forward backdrop clicks such that the consumer of the overlay can perform whatever\n // action desired when such a click occurs (usually closing the overlay).\n this._backdropElement.addEventListener('click', this._backdropClickHandler);\n\n // Add class to fade-in the backdrop after one frame.\n if (typeof requestAnimationFrame !== 'undefined') {\n this._ngZone.runOutsideAngular(() => {\n requestAnimationFrame(() => {\n if (this._backdropElement) {\n this._backdropElement.classList.add(showingClass);\n }\n });\n });\n } else {\n this._backdropElement.classList.add(showingClass);\n }\n }\n\n /\n Updates the stacking order of the element, moving it to the top if necessary.\n * This is required in cases where one overlay was detached, while another one,\n * that should be behind it, was destroyed. The next time both of them are opened,\n * the stacking will be wrong, because the detached element's pane will still be\n * in its original DOM position.\n /\n private _updateStackingOrder() {\n if (this._host.nextSibling) {\n this._host.parentNode!.appendChild(this._host);\n }\n }\n\n /* Detaches the backdrop (if any) associated with the overlay. /\n detachBackdrop(): void {\n const backdropToDetach = this._backdropElement;\n\n if (!backdropToDetach) {\n return;\n }\n\n let timeoutId: number;\n const finishDetach = () => {\n // It may not be attached to anything in certain cases (e.g. unit tests).\n if (backdropToDetach) {\n backdropToDetach.removeEventListener('click', this._backdropClickHandler);\n backdropToDetach.removeEventListener('transitionend', finishDetach);\n this._disposeBackdrop(backdropToDetach);\n }\n\n if (this._config.backdropClass) {\n this._toggleClasses(backdropToDetach!, this._config.backdropClass, false);\n }\n\n clearTimeout(timeoutId);\n };\n\n backdropToDetach.classList.remove('cdk-overlay-backdrop-showing');\n\n this._ngZone.runOutsideAngular(() => {\n backdropToDetach!.addEventListener('transitionend', finishDetach);\n });\n\n // If the backdrop doesn't have a transition, the `transitionend` event won't fire.\n // In this case we make it unclickable and we try to remove it after a delay.\n backdropToDetach.style.pointerEvents = 'none';\n\n // Run this outside the Angular zone because there's nothing that Angular cares about.\n // If it were to run inside the Angular zone, every test that used Overlay would have to be\n // either async or fakeAsync.\n timeoutId = this._ngZone.runOutsideAngular(() => setTimeout(finishDetach, 500));\n }\n\n /* Toggles a single CSS class or an array of classes on an element. /\n private _toggleClasses(element: HTMLElement, cssClasses: string \| string[], isAdd: boolean) {\n const classList = element.classList;\n\n coerceArray(cssClasses).forEach(cssClass => {\n // We can't do a spread here, because IE doesn't support setting multiple classes.\n // Also trying to add an empty string to a DOMTokenList will throw.\n if (cssClass) {\n isAdd ? classList.add(cssClass) : classList.remove(cssClass);\n }\n });\n }\n\n /* Detaches the overlay content next time the zone stabilizes. /\n private _detachContentWhenStable() {\n // Normally we wouldn't have to explicitly run this outside the `NgZone`, however\n // if the consumer is using `zone-patch-rxjs`, the `Subscription.unsubscribe` call will\n // be patched to run inside the zone, which will throw us into an infinite loop.\n this._ngZone.runOutsideAngular(() => {\n // We can't remove the host here immediately, because the overlay pane's content\n // might still be animating. This stream helps us avoid interrupting the animation\n // by waiting for the pane to become empty.\n const subscription = this._ngZone.onStable\n .pipe(takeUntil(merge(this._attachments, this._detachments)))\n .subscribe(() => {\n // Needs a couple of checks for the pane and host, because\n // they may have been removed by the time the zone stabilizes.\n if (!this._pane \|\| !this._host \|\| this._pane.children.length === 0) {\n if (this._pane && this._config.panelClass) {\n this._toggleClasses(this._pane, this._config.panelClass, false);\n }\n\n if (this._host && this._host.parentElement) {\n this._previousHostParent = this._host.parentElement;\n this._previousHostParent.removeChild(this._host);\n }\n\n subscription.unsubscribe();\n }\n });\n });\n }\n\n /* Disposes of a scroll strategy. /\n private _disposeScrollStrategy() {\n const scrollStrategy = this._scrollStrategy;\n\n if (scrollStrategy) {\n scrollStrategy.disable();\n\n if (scrollStrategy.detach) {\n scrollStrategy.detach();\n }\n }\n }\n\n /* Removes a backdrop element from the DOM. /\n private _disposeBackdrop(backdrop: HTMLElement \| null) {\n if (backdrop) {\n if (backdrop.parentNode) {\n backdrop.parentNode.removeChild(backdrop);\n }\n\n // It is possible that a new portal has been attached to this overlay since we started\n // removing the backdrop. If that is the case, only clear the backdrop reference if it\n // is still the same instance that we started to remove.\n if (this._backdropElement === backdrop) {\n this._backdropElement = null;\n }\n }\n }\n}\n\n\n/* Size properties for an overlay. /\nexport interface OverlaySizeConfig {\n width?: number \| string;\n height?: number \| string;\n minWidth?: number \| string;\n minHeight?: number \| string;\n maxWidth?: number \| string;\n maxHeight?: number \| string;\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {PositionStrategy} from './position-strategy';\nimport {ElementRef} from '@angular/core';\nimport {ViewportRuler, CdkScrollable, ViewportScrollPosition} from '@angular/cdk/scrolling';\nimport {\n ConnectedOverlayPositionChange,\n ConnectionPositionPair,\n ScrollingVisibility,\n validateHorizontalPosition,\n validateVerticalPosition,\n} from './connected-position';\nimport {Observable, Subscription, Subject} from 'rxjs';\nimport {OverlayReference} from '../overlay-reference';\nimport {isElementScrolledOutsideView, isElementClippedByScrolling} from './scroll-clip';\nimport {coerceCssPixelValue, coerceArray} from '@angular/cdk/coercion';\nimport {Platform} from '@angular/cdk/platform';\nimport {OverlayContainer} from '../overlay-container';\n\n// TODO: refactor clipping detection into a separate thing (part of scrolling module)\n// TODO: doesn't handle both flexible width and height when it has to scroll along both axis.\n\n/* Class to be added to the overlay bounding box. /\nconst boundingBoxClass = 'cdk-overlay-connected-position-bounding-box';\n\n/* Regex used to split a string on its CSS units. /\nconst cssUnitPattern = /([A-Za-z%]+)$/;\n\n/* Possible values that can be set as the origin of a FlexibleConnectedPositionStrategy. /\nexport type FlexibleConnectedPositionStrategyOrigin = ElementRef \| Element \| Point & {\n width?: number;\n height?: number;\n};\n\n/\n A strategy for positioning overlays. Using this strategy, an overlay is given an\n * implicit position relative some origin element. The relative position is defined in terms of\n * a point on the origin element that is connected to a point on the overlay element. For example,\n * a basic dropdown is connecting the bottom-left corner of the origin to the top-left corner\n * of the overlay.\n /\nexport class FlexibleConnectedPositionStrategy implements PositionStrategy {\n /* The overlay to which this strategy is attached. /\n private _overlayRef: OverlayReference;\n\n /* Whether we're performing the very first positioning of the overlay. /\n private _isInitialRender: boolean;\n\n /* Last size used for the bounding box. Used to avoid resizing the overlay after open. /\n private _lastBoundingBoxSize = {width: 0, height: 0};\n\n /* Whether the overlay was pushed in a previous positioning. /\n private _isPushed = false;\n\n /* Whether the overlay can be pushed on-screen on the initial open. /\n private _canPush = true;\n\n /* Whether the overlay can grow via flexible width/height after the initial open. /\n private _growAfterOpen = false;\n\n /* Whether the overlay's width and height can be constrained to fit within the viewport. /\n private _hasFlexibleDimensions = true;\n\n /* Whether the overlay position is locked. /\n private _positionLocked = false;\n\n /* Cached origin dimensions /\n private _originRect: ClientRect;\n\n /* Cached overlay dimensions /\n private _overlayRect: ClientRect;\n\n /* Cached viewport dimensions /\n private _viewportRect: ClientRect;\n\n /* Amount of space that must be maintained between the overlay and the edge of the viewport. /\n private _viewportMargin = 0;\n\n /* The Scrollable containers used to check scrollable view properties on position change. /\n private _scrollables: CdkScrollable[] = [];\n\n /* Ordered list of preferred positions, from most to least desirable. /\n _preferredPositions: ConnectionPositionPair[] = [];\n\n /* The origin element against which the overlay will be positioned. /\n private _origin: FlexibleConnectedPositionStrategyOrigin;\n\n /* The overlay pane element. /\n private _pane: HTMLElement;\n\n /* Whether the strategy has been disposed of already. /\n private _isDisposed: boolean;\n\n /\n Parent element for the overlay panel used to constrain the overlay panel's size to fit\n * within the viewport.\n /\n private _boundingBox: HTMLElement \| null;\n\n /* The last position to have been calculated as the best fit position. /\n private _lastPosition: ConnectedPosition \| null;\n\n /* Subject that emits whenever the position changes. /\n private readonly _positionChanges = new Subject<ConnectedOverlayPositionChange>();\n\n /* Subscription to viewport size changes. /\n private _resizeSubscription = Subscription.EMPTY;\n\n /* Default offset for the overlay along the x axis. /\n private _offsetX = 0;\n\n /* Default offset for the overlay along the y axis. /\n private _offsetY = 0;\n\n /* Selector to be used when finding the elements on which to set the transform origin. /\n private _transformOriginSelector: string;\n\n /* Keeps track of the CSS classes that the position strategy has applied on the overlay panel. /\n private _appliedPanelClasses: string[] = [];\n\n /* Amount by which the overlay was pushed in each axis during the last time it was positioned. /\n private _previousPushAmount: {x: number, y: number} \| null;\n\n /* Observable sequence of position changes. /\n positionChanges: Observable<ConnectedOverlayPositionChange> = this._positionChanges;\n\n /* Ordered list of preferred positions, from most to least desirable. /\n get positions(): ConnectionPositionPair[] {\n return this._preferredPositions;\n }\n\n constructor(\n connectedTo: FlexibleConnectedPositionStrategyOrigin, private _viewportRuler: ViewportRuler,\n private _document: Document, private _platform: Platform,\n private _overlayContainer: OverlayContainer) {\n this.setOrigin(connectedTo);\n }\n\n /* Attaches this position strategy to an overlay. /\n attach(overlayRef: OverlayReference): void {\n if (this._overlayRef && overlayRef !== this._overlayRef &&\n (typeof ngDevMode === 'undefined' \|\| ngDevMode)) {\n throw Error('This position strategy is already attached to an overlay');\n }\n\n this._validatePositions();\n\n overlayRef.hostElement.classList.add(boundingBoxClass);\n\n this._overlayRef = overlayRef;\n this._boundingBox = overlayRef.hostElement;\n this._pane = overlayRef.overlayElement;\n this._isDisposed = false;\n this._isInitialRender = true;\n this._lastPosition = null;\n this._resizeSubscription.unsubscribe();\n this._resizeSubscription = this._viewportRuler.change().subscribe(() => {\n // When the window is resized, we want to trigger the next reposition as if it\n // was an initial render, in order for the strategy to pick a new optimal position,\n // otherwise position locking will cause it to stay at the old one.\n this._isInitialRender = true;\n this.apply();\n });\n }\n\n /\n Updates the position of the overlay element, using whichever preferred position relative\n * to the origin best fits on-screen.\n \n The selection of a position goes as follows:\n * - If any positions fit completely within the viewport as-is,\n * choose the first position that does so.\n * - If flexible dimensions are enabled and at least one satifies the given minimum width/height,\n * choose the position with the greatest available size modified by the positions' weight.\n * - If pushing is enabled, take the position that went off-screen the least and push it\n * on-screen.\n * - If none of the previous criteria were met, use the position that goes off-screen the least.\n * @docs-private\n /\n apply(): void {\n // We shouldn't do anything if the strategy was disposed or we're on the server.\n if (this._isDisposed \|\| !this._platform.isBrowser) {\n return;\n }\n\n // If the position has been applied already (e.g. when the overlay was opened) and the\n // consumer opted into locking in the position, re-use the old position, in order to\n // prevent the overlay from jumping around.\n if (!this._isInitialRender && this._positionLocked && this._lastPosition) {\n this.reapplyLastPosition();\n return;\n }\n\n this._clearPanelClasses();\n this._resetOverlayElementStyles();\n this._resetBoundingBoxStyles();\n\n // We need the bounding rects for the origin and the overlay to determine how to position\n // the overlay relative to the origin.\n // We use the viewport rect to determine whether a position would go off-screen.\n this._viewportRect = this._getNarrowedViewportRect();\n this._originRect = this._getOriginRect();\n this._overlayRect = this._pane.getBoundingClientRect();\n\n const originRect = this._originRect;\n const overlayRect = this._overlayRect;\n const viewportRect = this._viewportRect;\n\n // Positions where the overlay will fit with flexible dimensions.\n const flexibleFits: FlexibleFit[] = [];\n\n // Fallback if none of the preferred positions fit within the viewport.\n let fallback: FallbackPosition \| undefined;\n\n // Go through each of the preferred positions looking for a good fit.\n // If a good fit is found, it will be applied immediately.\n for (let pos of this._preferredPositions) {\n // Get the exact (x, y) coordinate for the point-of-origin on the origin element.\n let originPoint = this._getOriginPoint(originRect, pos);\n\n // From that point-of-origin, get the exact (x, y) coordinate for the top-left corner of the\n // overlay in this position. We use the top-left corner for calculations and later translate\n // this into an appropriate (top, left, bottom, right) style.\n let overlayPoint = this._getOverlayPoint(originPoint, overlayRect, pos);\n\n // Calculate how well the overlay would fit into the viewport with this point.\n let overlayFit = this._getOverlayFit(overlayPoint, overlayRect, viewportRect, pos);\n\n // If the overlay, without any further work, fits into the viewport, use this position.\n if (overlayFit.isCompletelyWithinViewport) {\n this._isPushed = false;\n this._applyPosition(pos, originPoint);\n return;\n }\n\n // If the overlay has flexible dimensions, we can use this position\n // so long as there's enough space for the minimum dimensions.\n if (this._canFitWithFlexibleDimensions(overlayFit, overlayPoint, viewportRect)) {\n // Save positions where the overlay will fit with flexible dimensions. We will use these\n // if none of the positions fit without* flexible dimensions.\n flexibleFits.push({\n position: pos,\n origin: originPoint,\n overlayRect,\n boundingBoxRect: this._calculateBoundingBoxRect(originPoint, pos)\n });\n\n continue;\n }\n\n // If the current preferred position does not fit on the screen, remember the position\n // if it has more visible area on-screen than we've seen and move onto the next preferred\n // position.\n if (!fallback \|\| fallback.overlayFit.visibleArea < overlayFit.visibleArea) {\n fallback = {overlayFit, overlayPoint, originPoint, position: pos, overlayRect};\n }\n }\n\n // If there are any positions where the overlay would fit with flexible dimensions, choose the\n // one that has the greatest area available modified by the position's weight\n if (flexibleFits.length) {\n let bestFit: FlexibleFit \| null = null;\n let bestScore = -1;\n for (const fit of flexibleFits) {\n const score =\n fit.boundingBoxRect.width * fit.boundingBoxRect.height * (fit.position.weight \|\| 1);\n if (score > bestScore) {\n bestScore = score;\n bestFit = fit;\n }\n }\n\n this._isPushed = false;\n this._applyPosition(bestFit!.position, bestFit!.origin);\n return;\n }\n\n // When none of the preferred positions fit within the viewport, take the position\n // that went off-screen the least and attempt to push it on-screen.\n if (this._canPush) {\n // TODO(jelbourn): after pushing, the opening \"direction\" of the overlay might not make sense.\n this._isPushed = true;\n this._applyPosition(fallback!.position, fallback!.originPoint);\n return;\n }\n\n // All options for getting the overlay within the viewport have been exhausted, so go with the\n // position that went off-screen the least.\n this._applyPosition(fallback!.position, fallback!.originPoint);\n }\n\n detach(): void {\n this._clearPanelClasses();\n this._lastPosition = null;\n this._previousPushAmount = null;\n this._resizeSubscription.unsubscribe();\n }\n\n /** Cleanup after the element gets destroyed. /\n dispose(): void {\n if (this._isDisposed) {\n return;\n }\n\n // We can't use `_resetBoundingBoxStyles` here, because it resets\n // some properties to zero, rather than removing them.\n if (this._boundingBox) {\n extendStyles(this._boundingBox.style, {\n top: '',\n left: '',\n right: '',\n bottom: '',\n height: '',\n width: '',\n alignItems: '',\n justifyContent: '',\n } as CSSStyleDeclaration);\n }\n\n if (this._pane) {\n this._resetOverlayElementStyles();\n }\n\n if (this._overlayRef) {\n this._overlayRef.hostElement.classList.remove(boundingBoxClass);\n }\n\n this.detach();\n this._positionChanges.complete();\n this._overlayRef = this._boundingBox = null!;\n this._isDisposed = true;\n }\n\n /\n This re-aligns the overlay element with the trigger in its last calculated position,\n * even if a position higher in the \"preferred positions\" list would now fit. This\n * allows one to re-align the panel without changing the orientation of the panel.\n /\n reapplyLastPosition(): void {\n if (!this._isDisposed && (!this._platform \|\| this._platform.isBrowser)) {\n this._originRect = this._getOriginRect();\n this._overlayRect = this._pane.getBoundingClientRect();\n this._viewportRect = this._getNarrowedViewportRect();\n\n const lastPosition = this._lastPosition \|\| this._preferredPositions[0];\n const originPoint = this._getOriginPoint(this._originRect, lastPosition);\n\n this._applyPosition(lastPosition, originPoint);\n }\n }\n\n /\n Sets the list of Scrollable containers that host the origin element so that\n * on reposition we can evaluate if it or the overlay has been clipped or outside view. Every\n * Scrollable must be an ancestor element of the strategy's origin element.\n /\n withScrollableContainers(scrollables: CdkScrollable[]): this {\n this._scrollables = scrollables;\n return this;\n }\n\n /\n Adds new preferred positions.\n * @param positions List of positions options for this overlay.\n /\n withPositions(positions: ConnectedPosition[]): this {\n this._preferredPositions = positions;\n\n // If the last calculated position object isn't part of the positions anymore, clear\n // it in order to avoid it being picked up if the consumer tries to re-apply.\n if (positions.indexOf(this._lastPosition!) === -1) {\n this._lastPosition = null;\n }\n\n this._validatePositions();\n\n return this;\n }\n\n /\n Sets a minimum distance the overlay may be positioned to the edge of the viewport.\n * @param margin Required margin between the overlay and the viewport edge in pixels.\n /\n withViewportMargin(margin: number): this {\n this._viewportMargin = margin;\n return this;\n }\n\n /* Sets whether the overlay's width and height can be constrained to fit within the viewport. /\n withFlexibleDimensions(flexibleDimensions = true): this {\n this._hasFlexibleDimensions = flexibleDimensions;\n return this;\n }\n\n /* Sets whether the overlay can grow after the initial open via flexible width/height. /\n withGrowAfterOpen(growAfterOpen = true): this {\n this._growAfterOpen = growAfterOpen;\n return this;\n }\n\n /* Sets whether the overlay can be pushed on-screen if none of the provided positions fit. /\n withPush(canPush = true): this {\n this._canPush = canPush;\n return this;\n }\n\n /\n Sets whether the overlay's position should be locked in after it is positioned\n * initially. When an overlay is locked in, it won't attempt to reposition itself\n * when the position is re-applied (e.g. when the user scrolls away).\n * @param isLocked Whether the overlay should locked in.\n /\n withLockedPosition(isLocked = true): this {\n this._positionLocked = isLocked;\n return this;\n }\n\n /\n Sets the origin, relative to which to position the overlay.\n * Using an element origin is useful for building components that need to be positioned\n * relatively to a trigger (e.g. dropdown menus or tooltips), whereas using a point can be\n * used for cases like contextual menus which open relative to the user's pointer.\n * @param origin Reference to the new origin.\n /\n setOrigin(origin: FlexibleConnectedPositionStrategyOrigin): this {\n this._origin = origin;\n return this;\n }\n\n /\n Sets the default offset for the overlay's connection point on the x-axis.\n * @param offset New offset in the X axis.\n /\n withDefaultOffsetX(offset: number): this {\n this._offsetX = offset;\n return this;\n }\n\n /\n Sets the default offset for the overlay's connection point on the y-axis.\n * @param offset New offset in the Y axis.\n /\n withDefaultOffsetY(offset: number): this {\n this._offsetY = offset;\n return this;\n }\n\n /\n Configures that the position strategy should set a `transform-origin` on some elements\n * inside the overlay, depending on the current position that is being applied. This is\n * useful for the cases where the origin of an animation can change depending on the\n * alignment of the overlay.\n * @param selector CSS selector that will be used to find the target\n * elements onto which to set the transform origin.\n /\n withTransformOriginOn(selector: string): this {\n this._transformOriginSelector = selector;\n return this;\n }\n\n /\n Gets the (x, y) coordinate of a connection point on the origin based on a relative position.\n /\n private _getOriginPoint(originRect: ClientRect, pos: ConnectedPosition): Point {\n let x: number;\n if (pos.originX == 'center') {\n // Note: when centering we should always use the `left`\n // offset, otherwise the position will be wrong in RTL.\n x = originRect.left + (originRect.width / 2);\n } else {\n const startX = this._isRtl() ? originRect.right : originRect.left;\n const endX = this._isRtl() ? originRect.left : originRect.right;\n x = pos.originX == 'start' ? startX : endX;\n }\n\n let y: number;\n if (pos.originY == 'center') {\n y = originRect.top + (originRect.height / 2);\n } else {\n y = pos.originY == 'top' ? originRect.top : originRect.bottom;\n }\n\n return {x, y};\n }\n\n\n /\n Gets the (x, y) coordinate of the top-left corner of the overlay given a given position and\n * origin point to which the overlay should be connected.\n /\n private _getOverlayPoint(\n originPoint: Point,\n overlayRect: ClientRect,\n pos: ConnectedPosition): Point {\n\n // Calculate the (overlayStartX, overlayStartY), the start of the\n // potential overlay position relative to the origin point.\n let overlayStartX: number;\n if (pos.overlayX == 'center') {\n overlayStartX = -overlayRect.width / 2;\n } else if (pos.overlayX === 'start') {\n overlayStartX = this._isRtl() ? -overlayRect.width : 0;\n } else {\n overlayStartX = this._isRtl() ? 0 : -overlayRect.width;\n }\n\n let overlayStartY: number;\n if (pos.overlayY == 'center') {\n overlayStartY = -overlayRect.height / 2;\n } else {\n overlayStartY = pos.overlayY == 'top' ? 0 : -overlayRect.height;\n }\n\n // The (x, y) coordinates of the overlay.\n return {\n x: originPoint.x + overlayStartX,\n y: originPoint.y + overlayStartY,\n };\n }\n\n /* Gets how well an overlay at the given point will fit within the viewport. /\n private _getOverlayFit(point: Point, rawOverlayRect: ClientRect, viewport: ClientRect,\n position: ConnectedPosition): OverlayFit {\n\n // Round the overlay rect when comparing against the\n // viewport, because the viewport is always rounded.\n const overlay = getRoundedBoundingClientRect(rawOverlayRect);\n let {x, y} = point;\n let offsetX = this._getOffset(position, 'x');\n let offsetY = this._getOffset(position, 'y');\n\n // Account for the offsets since they could push the overlay out of the viewport.\n if (offsetX) {\n x += offsetX;\n }\n\n if (offsetY) {\n y += offsetY;\n }\n\n // How much the overlay would overflow at this position, on each side.\n let leftOverflow = 0 - x;\n let rightOverflow = (x + overlay.width) - viewport.width;\n let topOverflow = 0 - y;\n let bottomOverflow = (y + overlay.height) - viewport.height;\n\n // Visible parts of the element on each axis.\n let visibleWidth = this._subtractOverflows(overlay.width, leftOverflow, rightOverflow);\n let visibleHeight = this._subtractOverflows(overlay.height, topOverflow, bottomOverflow);\n let visibleArea = visibleWidth visibleHeight;\n\n return {\n visibleArea,\n isCompletelyWithinViewport: (overlay.width * overlay.height) === visibleArea,\n fitsInViewportVertically: visibleHeight === overlay.height,\n fitsInViewportHorizontally: visibleWidth == overlay.width,\n };\n }\n\n /*\n Whether the overlay can fit within the viewport when it may resize either its width or height.\n * @param fit How well the overlay fits in the viewport at some position.\n * @param point The (x, y) coordinates of the overlat at some position.\n * @param viewport The geometry of the viewport.\n /\n private _canFitWithFlexibleDimensions(fit: OverlayFit, point: Point, viewport: ClientRect) {\n if (this._hasFlexibleDimensions) {\n const availableHeight = viewport.bottom - point.y;\n const availableWidth = viewport.right - point.x;\n const minHeight = getPixelValue(this._overlayRef.getConfig().minHeight);\n const minWidth = getPixelValue(this._overlayRef.getConfig().minWidth);\n\n const verticalFit = fit.fitsInViewportVertically \|\|\n (minHeight != null && minHeight <= availableHeight);\n const horizontalFit = fit.fitsInViewportHorizontally \|\|\n (minWidth != null && minWidth <= availableWidth);\n\n return verticalFit && horizontalFit;\n }\n return false;\n }\n\n /\n Gets the point at which the overlay can be \"pushed\" on-screen. If the overlay is larger than\n * the viewport, the top-left corner will be pushed on-screen (with overflow occuring on the\n * right and bottom).\n \n @param start Starting point from which the overlay is pushed.\n * @param overlay Dimensions of the overlay.\n * @param scrollPosition Current viewport scroll position.\n * @returns The point at which to position the overlay after pushing. This is effectively a new\n * originPoint.\n /\n private _pushOverlayOnScreen(start: Point,\n rawOverlayRect: ClientRect,\n scrollPosition: ViewportScrollPosition): Point {\n // If the position is locked and we've pushed the overlay already, reuse the previous push\n // amount, rather than pushing it again. If we were to continue pushing, the element would\n // remain in the viewport, which goes against the expectations when position locking is enabled.\n if (this._previousPushAmount && this._positionLocked) {\n return {\n x: start.x + this._previousPushAmount.x,\n y: start.y + this._previousPushAmount.y\n };\n }\n\n // Round the overlay rect when comparing against the\n // viewport, because the viewport is always rounded.\n const overlay = getRoundedBoundingClientRect(rawOverlayRect);\n const viewport = this._viewportRect;\n\n // Determine how much the overlay goes outside the viewport on each\n // side, which we'll use to decide which direction to push it.\n const overflowRight = Math.max(start.x + overlay.width - viewport.width, 0);\n const overflowBottom = Math.max(start.y + overlay.height - viewport.height, 0);\n const overflowTop = Math.max(viewport.top - scrollPosition.top - start.y, 0);\n const overflowLeft = Math.max(viewport.left - scrollPosition.left - start.x, 0);\n\n // Amount by which to push the overlay in each axis such that it remains on-screen.\n let pushX = 0;\n let pushY = 0;\n\n // If the overlay fits completely within the bounds of the viewport, push it from whichever\n // direction is goes off-screen. Otherwise, push the top-left corner such that its in the\n // viewport and allow for the trailing end of the overlay to go out of bounds.\n if (overlay.width <= viewport.width) {\n pushX = overflowLeft \|\| -overflowRight;\n } else {\n pushX = start.x < this._viewportMargin ? (viewport.left - scrollPosition.left) - start.x : 0;\n }\n\n if (overlay.height <= viewport.height) {\n pushY = overflowTop \|\| -overflowBottom;\n } else {\n pushY = start.y < this._viewportMargin ? (viewport.top - scrollPosition.top) - start.y : 0;\n }\n\n this._previousPushAmount = {x: pushX, y: pushY};\n\n return {\n x: start.x + pushX,\n y: start.y + pushY,\n };\n }\n\n /\n Applies a computed position to the overlay and emits a position change.\n * @param position The position preference\n * @param originPoint The point on the origin element where the overlay is connected.\n /\n private _applyPosition(position: ConnectedPosition, originPoint: Point) {\n this._setTransformOrigin(position);\n this._setOverlayElementStyles(originPoint, position);\n this._setBoundingBoxStyles(originPoint, position);\n\n if (position.panelClass) {\n this._addPanelClasses(position.panelClass);\n }\n\n // Save the last connected position in case the position needs to be re-calculated.\n this._lastPosition = position;\n\n // Notify that the position has been changed along with its change properties.\n // We only emit if we've got any subscriptions, because the scroll visibility\n // calculcations can be somewhat expensive.\n if (this._positionChanges.observers.length) {\n const scrollableViewProperties = this._getScrollVisibility();\n const changeEvent = new ConnectedOverlayPositionChange(position, scrollableViewProperties);\n this._positionChanges.next(changeEvent);\n }\n\n this._isInitialRender = false;\n }\n\n /* Sets the transform origin based on the configured selector and the passed-in position. /\n private _setTransformOrigin(position: ConnectedPosition) {\n if (!this._transformOriginSelector) {\n return;\n }\n\n const elements: NodeListOf<HTMLElement> =\n this._boundingBox!.querySelectorAll(this._transformOriginSelector);\n let xOrigin: 'left' \| 'right' \| 'center';\n let yOrigin: 'top' \| 'bottom' \| 'center' = position.overlayY;\n\n if (position.overlayX === 'center') {\n xOrigin = 'center';\n } else if (this._isRtl()) {\n xOrigin = position.overlayX === 'start' ? 'right' : 'left';\n } else {\n xOrigin = position.overlayX === 'start' ? 'left' : 'right';\n }\n\n for (let i = 0; i < elements.length; i++) {\n elements[i].style.transformOrigin = `${xOrigin} ${yOrigin}`;\n }\n }\n\n /\n Gets the position and size of the overlay's sizing container.\n \n This method does no measuring and applies no styles so that we can cheaply compute the\n * bounds for all positions and choose the best fit based on these results.\n /\n private _calculateBoundingBoxRect(origin: Point, position: ConnectedPosition): BoundingBoxRect {\n const viewport = this._viewportRect;\n const isRtl = this._isRtl();\n let height: number, top: number, bottom: number;\n\n if (position.overlayY === 'top') {\n // Overlay is opening \"downward\" and thus is bound by the bottom viewport edge.\n top = origin.y;\n height = viewport.height - top + this._viewportMargin;\n } else if (position.overlayY === 'bottom') {\n // Overlay is opening \"upward\" and thus is bound by the top viewport edge. We need to add\n // the viewport margin back in, because the viewport rect is narrowed down to remove the\n // margin, whereas the `origin` position is calculated based on its `ClientRect`.\n bottom = viewport.height - origin.y + this._viewportMargin 2;\n height = viewport.height - bottom + this._viewportMargin;\n } else {\n // If neither top nor bottom, it means that the overlay is vertically centered on the\n // origin point. Note that we want the position relative to the viewport, rather than\n // the page, which is why we don't use something like `viewport.bottom - origin.y` and\n // `origin.y - viewport.top`.\n const smallestDistanceToViewportEdge =\n Math.min(viewport.bottom - origin.y + viewport.top, origin.y);\n\n const previousHeight = this._lastBoundingBoxSize.height;\n\n height = smallestDistanceToViewportEdge * 2;\n top = origin.y - smallestDistanceToViewportEdge;\n\n if (height > previousHeight && !this._isInitialRender && !this._growAfterOpen) {\n top = origin.y - (previousHeight / 2);\n }\n }\n\n // The overlay is opening 'right-ward' (the content flows to the right).\n const isBoundedByRightViewportEdge =\n (position.overlayX === 'start' && !isRtl) \|\|\n (position.overlayX === 'end' && isRtl);\n\n // The overlay is opening 'left-ward' (the content flows to the left).\n const isBoundedByLeftViewportEdge =\n (position.overlayX === 'end' && !isRtl) \|\|\n (position.overlayX === 'start' && isRtl);\n\n let width: number, left: number, right: number;\n\n if (isBoundedByLeftViewportEdge) {\n right = viewport.width - origin.x + this._viewportMargin;\n width = origin.x - this._viewportMargin;\n } else if (isBoundedByRightViewportEdge) {\n left = origin.x;\n width = viewport.right - origin.x;\n } else {\n // If neither start nor end, it means that the overlay is horizontally centered on the\n // origin point. Note that we want the position relative to the viewport, rather than\n // the page, which is why we don't use something like `viewport.right - origin.x` and\n // `origin.x - viewport.left`.\n const smallestDistanceToViewportEdge =\n Math.min(viewport.right - origin.x + viewport.left, origin.x);\n const previousWidth = this._lastBoundingBoxSize.width;\n\n width = smallestDistanceToViewportEdge * 2;\n left = origin.x - smallestDistanceToViewportEdge;\n\n if (width > previousWidth && !this._isInitialRender && !this._growAfterOpen) {\n left = origin.x - (previousWidth / 2);\n }\n }\n\n return {top: top!, left: left!, bottom: bottom!, right: right!, width, height};\n }\n\n /*\n Sets the position and size of the overlay's sizing wrapper. The wrapper is positioned on the\n * origin's connection point and stetches to the bounds of the viewport.\n \n @param origin The point on the origin element where the overlay is connected.\n * @param position The position preference\n /\n private _setBoundingBoxStyles(origin: Point, position: ConnectedPosition): void {\n const boundingBoxRect = this._calculateBoundingBoxRect(origin, position);\n\n // It's weird if the overlay grows* while scrolling, so we take the last size into account\n // when applying a new size.\n if (!this._isInitialRender && !this._growAfterOpen) {\n boundingBoxRect.height = Math.min(boundingBoxRect.height, this._lastBoundingBoxSize.height);\n boundingBoxRect.width = Math.min(boundingBoxRect.width, this._lastBoundingBoxSize.width);\n }\n\n const styles = {} as CSSStyleDeclaration;\n\n if (this._hasExactPosition()) {\n styles.top = styles.left = '0';\n styles.bottom = styles.right = styles.maxHeight = styles.maxWidth = '';\n styles.width = styles.height = '100%';\n } else {\n const maxHeight = this._overlayRef.getConfig().maxHeight;\n const maxWidth = this._overlayRef.getConfig().maxWidth;\n\n styles.height = coerceCssPixelValue(boundingBoxRect.height);\n styles.top = coerceCssPixelValue(boundingBoxRect.top);\n styles.bottom = coerceCssPixelValue(boundingBoxRect.bottom);\n styles.width = coerceCssPixelValue(boundingBoxRect.width);\n styles.left = coerceCssPixelValue(boundingBoxRect.left);\n styles.right = coerceCssPixelValue(boundingBoxRect.right);\n\n // Push the pane content towards the proper direction.\n if (position.overlayX === 'center') {\n styles.alignItems = 'center';\n } else {\n styles.alignItems = position.overlayX === 'end' ? 'flex-end' : 'flex-start';\n }\n\n if (position.overlayY === 'center') {\n styles.justifyContent = 'center';\n } else {\n styles.justifyContent = position.overlayY === 'bottom' ? 'flex-end' : 'flex-start';\n }\n\n if (maxHeight) {\n styles.maxHeight = coerceCssPixelValue(maxHeight);\n }\n\n if (maxWidth) {\n styles.maxWidth = coerceCssPixelValue(maxWidth);\n }\n }\n\n this._lastBoundingBoxSize = boundingBoxRect;\n\n extendStyles(this._boundingBox!.style, styles);\n }\n\n /** Resets the styles for the bounding box so that a new positioning can be computed. /\n private _resetBoundingBoxStyles() {\n extendStyles(this._boundingBox!.style, {\n top: '0',\n left: '0',\n right: '0',\n bottom: '0',\n height: '',\n width: '',\n alignItems: '',\n justifyContent: '',\n } as CSSStyleDeclaration);\n }\n\n /* Resets the styles for the overlay pane so that a new positioning can be computed. /\n private _resetOverlayElementStyles() {\n extendStyles(this._pane.style, {\n top: '',\n left: '',\n bottom: '',\n right: '',\n position: '',\n transform: '',\n } as CSSStyleDeclaration);\n }\n\n /* Sets positioning styles to the overlay element. /\n private _setOverlayElementStyles(originPoint: Point, position: ConnectedPosition): void {\n const styles = {} as CSSStyleDeclaration;\n const hasExactPosition = this._hasExactPosition();\n const hasFlexibleDimensions = this._hasFlexibleDimensions;\n const config = this._overlayRef.getConfig();\n\n if (hasExactPosition) {\n const scrollPosition = this._viewportRuler.getViewportScrollPosition();\n extendStyles(styles, this._getExactOverlayY(position, originPoint, scrollPosition));\n extendStyles(styles, this._getExactOverlayX(position, originPoint, scrollPosition));\n } else {\n styles.position = 'static';\n }\n\n // Use a transform to apply the offsets. We do this because the `center` positions rely on\n // being in the normal flex flow and setting a `top` / `left` at all will completely throw\n // off the position. We also can't use margins, because they won't have an effect in some\n // cases where the element doesn't have anything to \"push off of\". Finally, this works\n // better both with flexible and non-flexible positioning.\n let transformString = '';\n let offsetX = this._getOffset(position, 'x');\n let offsetY = this._getOffset(position, 'y');\n\n if (offsetX) {\n transformString += `translateX(${offsetX}px) `;\n }\n\n if (offsetY) {\n transformString += `translateY(${offsetY}px)`;\n }\n\n styles.transform = transformString.trim();\n\n // If a maxWidth or maxHeight is specified on the overlay, we remove them. We do this because\n // we need these values to both be set to \"100%\" for the automatic flexible sizing to work.\n // The maxHeight and maxWidth are set on the boundingBox in order to enforce the constraint.\n // Note that this doesn't apply when we have an exact position, in which case we do want to\n // apply them because they'll be cleared from the bounding box.\n if (config.maxHeight) {\n if (hasExactPosition) {\n styles.maxHeight = coerceCssPixelValue(config.maxHeight);\n } else if (hasFlexibleDimensions) {\n styles.maxHeight = '';\n }\n }\n\n if (config.maxWidth) {\n if (hasExactPosition) {\n styles.maxWidth = coerceCssPixelValue(config.maxWidth);\n } else if (hasFlexibleDimensions) {\n styles.maxWidth = '';\n }\n }\n\n extendStyles(this._pane.style, styles);\n }\n\n /* Gets the exact top/bottom for the overlay when not using flexible sizing or when pushing. /\n private _getExactOverlayY(position: ConnectedPosition,\n originPoint: Point,\n scrollPosition: ViewportScrollPosition) {\n // Reset any existing styles. This is necessary in case the\n // preferred position has changed since the last `apply`.\n let styles = {top: '', bottom: ''} as CSSStyleDeclaration;\n let overlayPoint = this._getOverlayPoint(originPoint, this._overlayRect, position);\n\n if (this._isPushed) {\n overlayPoint = this._pushOverlayOnScreen(overlayPoint, this._overlayRect, scrollPosition);\n }\n\n let virtualKeyboardOffset =\n this._overlayContainer.getContainerElement().getBoundingClientRect().top;\n\n // Normally this would be zero, however when the overlay is attached to an input (e.g. in an\n // autocomplete), mobile browsers will shift everything in order to put the input in the middle\n // of the screen and to make space for the virtual keyboard. We need to account for this offset,\n // otherwise our positioning will be thrown off.\n overlayPoint.y -= virtualKeyboardOffset;\n\n // We want to set either `top` or `bottom` based on whether the overlay wants to appear\n // above or below the origin and the direction in which the element will expand.\n if (position.overlayY === 'bottom') {\n // When using `bottom`, we adjust the y position such that it is the distance\n // from the bottom of the viewport rather than the top.\n const documentHeight = this._document.documentElement!.clientHeight;\n styles.bottom = `${documentHeight - (overlayPoint.y + this._overlayRect.height)}px`;\n } else {\n styles.top = coerceCssPixelValue(overlayPoint.y);\n }\n\n return styles;\n }\n\n /* Gets the exact left/right for the overlay when not using flexible sizing or when pushing. /\n private _getExactOverlayX(position: ConnectedPosition,\n originPoint: Point,\n scrollPosition: ViewportScrollPosition) {\n // Reset any existing styles. This is necessary in case the preferred position has\n // changed since the last `apply`.\n let styles = {left: '', right: ''} as CSSStyleDeclaration;\n let overlayPoint = this._getOverlayPoint(originPoint, this._overlayRect, position);\n\n if (this._isPushed) {\n overlayPoint = this._pushOverlayOnScreen(overlayPoint, this._overlayRect, scrollPosition);\n }\n\n // We want to set either `left` or `right` based on whether the overlay wants to appear \"before\"\n // or \"after\" the origin, which determines the direction in which the element will expand.\n // For the horizontal axis, the meaning of \"before\" and \"after\" change based on whether the\n // page is in RTL or LTR.\n let horizontalStyleProperty: 'left' \| 'right';\n\n if (this._isRtl()) {\n horizontalStyleProperty = position.overlayX === 'end' ? 'left' : 'right';\n } else {\n horizontalStyleProperty = position.overlayX === 'end' ? 'right' : 'left';\n }\n\n // When we're setting `right`, we adjust the x position such that it is the distance\n // from the right edge of the viewport rather than the left edge.\n if (horizontalStyleProperty === 'right') {\n const documentWidth = this._document.documentElement!.clientWidth;\n styles.right = `${documentWidth - (overlayPoint.x + this._overlayRect.width)}px`;\n } else {\n styles.left = coerceCssPixelValue(overlayPoint.x);\n }\n\n return styles;\n }\n\n /\n Gets the view properties of the trigger and overlay, including whether they are clipped\n * or completely outside the view of any of the strategy's scrollables.\n /\n private _getScrollVisibility(): ScrollingVisibility {\n // Note: needs fresh rects since the position could've changed.\n const originBounds = this._getOriginRect();\n const overlayBounds = this._pane.getBoundingClientRect();\n\n // TODO(jelbourn): instead of needing all of the client rects for these scrolling containers\n // every time, we should be able to use the scrollTop of the containers if the size of those\n // containers hasn't changed.\n const scrollContainerBounds = this._scrollables.map(scrollable => {\n return scrollable.getElementRef().nativeElement.getBoundingClientRect();\n });\n\n return {\n isOriginClipped: isElementClippedByScrolling(originBounds, scrollContainerBounds),\n isOriginOutsideView: isElementScrolledOutsideView(originBounds, scrollContainerBounds),\n isOverlayClipped: isElementClippedByScrolling(overlayBounds, scrollContainerBounds),\n isOverlayOutsideView: isElementScrolledOutsideView(overlayBounds, scrollContainerBounds),\n };\n }\n\n /* Subtracts the amount that an element is overflowing on an axis from its length. /\n private _subtractOverflows(length: number, ...overflows: number[]): number {\n return overflows.reduce((currentValue: number, currentOverflow: number) => {\n return currentValue - Math.max(currentOverflow, 0);\n }, length);\n }\n\n /* Narrows the given viewport rect by the current _viewportMargin. /\n private _getNarrowedViewportRect(): ClientRect {\n // We recalculate the viewport rect here ourselves, rather than using the ViewportRuler,\n // because we want to use the `clientWidth` and `clientHeight` as the base. The difference\n // being that the client properties don't include the scrollbar, as opposed to `innerWidth`\n // and `innerHeight` that do. This is necessary, because the overlay container uses\n // 100% `width` and `height` which don't include the scrollbar either.\n const width = this._document.documentElement!.clientWidth;\n const height = this._document.documentElement!.clientHeight;\n const scrollPosition = this._viewportRuler.getViewportScrollPosition();\n\n return {\n top: scrollPosition.top + this._viewportMargin,\n left: scrollPosition.left + this._viewportMargin,\n right: scrollPosition.left + width - this._viewportMargin,\n bottom: scrollPosition.top + height - this._viewportMargin,\n width: width - (2 this._viewportMargin),\n height: height - (2 * this._viewportMargin),\n };\n }\n\n /** Whether the we're dealing with an RTL context /\n private _isRtl() {\n return this._overlayRef.getDirection() === 'rtl';\n }\n\n /* Determines whether the overlay uses exact or flexible positioning. /\n private _hasExactPosition() {\n return !this._hasFlexibleDimensions \|\| this._isPushed;\n }\n\n /* Retrieves the offset of a position along the x or y axis. /\n private _getOffset(position: ConnectedPosition, axis: 'x' \| 'y') {\n if (axis === 'x') {\n // We don't do something like `position['offset' + axis]` in\n // order to avoid breking minifiers that rename properties.\n return position.offsetX == null ? this._offsetX : position.offsetX;\n }\n\n return position.offsetY == null ? this._offsetY : position.offsetY;\n }\n\n /* Validates that the current position match the expected values. /\n private _validatePositions(): void {\n if (typeof ngDevMode === 'undefined' \|\| ngDevMode) {\n if (!this._preferredPositions.length) {\n throw Error('FlexibleConnectedPositionStrategy: At least one position is required.');\n }\n\n // TODO(crisbeto): remove these once Angular's template type\n // checking is advanced enough to catch these cases.\n this._preferredPositions.forEach(pair => {\n validateHorizontalPosition('originX', pair.originX);\n validateVerticalPosition('originY', pair.originY);\n validateHorizontalPosition('overlayX', pair.overlayX);\n validateVerticalPosition('overlayY', pair.overlayY);\n });\n }\n }\n\n /* Adds a single CSS class or an array of classes on the overlay panel. /\n private _addPanelClasses(cssClasses: string \| string[]) {\n if (this._pane) {\n coerceArray(cssClasses).forEach(cssClass => {\n if (cssClass !== '' && this._appliedPanelClasses.indexOf(cssClass) === -1) {\n this._appliedPanelClasses.push(cssClass);\n this._pane.classList.add(cssClass);\n }\n });\n }\n }\n\n /* Clears the classes that the position strategy has applied from the overlay panel. /\n private _clearPanelClasses() {\n if (this._pane) {\n this._appliedPanelClasses.forEach(cssClass => {\n this._pane.classList.remove(cssClass);\n });\n this._appliedPanelClasses = [];\n }\n }\n\n /* Returns the ClientRect of the current origin. /\n private _getOriginRect(): ClientRect {\n const origin = this._origin;\n\n if (origin instanceof ElementRef) {\n return origin.nativeElement.getBoundingClientRect();\n }\n\n // Check for Element so SVG elements are also supported.\n if (origin instanceof Element) {\n return origin.getBoundingClientRect();\n }\n\n const width = origin.width \|\| 0;\n const height = origin.height \|\| 0;\n\n // If the origin is a point, return a client rect as if it was a 0x0 element at the point.\n return {\n top: origin.y,\n bottom: origin.y + height,\n left: origin.x,\n right: origin.x + width,\n height,\n width\n };\n }\n}\n\n/* A simple (x, y) coordinate. /\ninterface Point {\n x: number;\n y: number;\n}\n\n/* Record of measurements for how an overlay (at a given position) fits into the viewport. /\ninterface OverlayFit {\n /* Whether the overlay fits completely in the viewport. /\n isCompletelyWithinViewport: boolean;\n\n /* Whether the overlay fits in the viewport on the y-axis. /\n fitsInViewportVertically: boolean;\n\n /* Whether the overlay fits in the viewport on the x-axis. /\n fitsInViewportHorizontally: boolean;\n\n /* The total visible area (in px^2) of the overlay inside the viewport. /\n visibleArea: number;\n}\n\n/* Record of the measurments determining whether an overlay will fit in a specific position. /\ninterface FallbackPosition {\n position: ConnectedPosition;\n originPoint: Point;\n overlayPoint: Point;\n overlayFit: OverlayFit;\n overlayRect: ClientRect;\n}\n\n/* Position and size of the overlay sizing wrapper for a specific position. /\ninterface BoundingBoxRect {\n top: number;\n left: number;\n bottom: number;\n right: number;\n height: number;\n width: number;\n}\n\n/* Record of measures determining how well a given position will fit with flexible dimensions. /\ninterface FlexibleFit {\n position: ConnectedPosition;\n origin: Point;\n overlayRect: ClientRect;\n boundingBoxRect: BoundingBoxRect;\n}\n\n/* A connected position as specified by the user. /\nexport interface ConnectedPosition {\n originX: 'start' \| 'center' \| 'end';\n originY: 'top' \| 'center' \| 'bottom';\n\n overlayX: 'start' \| 'center' \| 'end';\n overlayY: 'top' \| 'center' \| 'bottom';\n\n weight?: number;\n offsetX?: number;\n offsetY?: number;\n panelClass?: string \| string[];\n}\n\n/* Shallow-extends a stylesheet object with another stylesheet object. /\nfunction extendStyles(destination: CSSStyleDeclaration,\n source: CSSStyleDeclaration): CSSStyleDeclaration {\n for (let key in source) {\n if (source.hasOwnProperty(key)) {\n destination[key] = source[key];\n }\n }\n\n return destination;\n}\n\n\n/\n Extracts the pixel value as a number from a value, if it's a number\n * or a CSS pixel string (e.g. `1337px`). Otherwise returns null.\n /\nfunction getPixelValue(input: number\|string\|null\|undefined): number\|null {\n if (typeof input !== 'number' && input != null) {\n const [value, units] = input.split(cssUnitPattern);\n return (!units \|\| units === 'px') ? parseFloat(value) : null;\n }\n\n return input \|\| null;\n}\n\n/\n Gets a version of an element's bounding `ClientRect` where all the values are rounded down to\n * the nearest pixel. This allows us to account for the cases where there may be sub-pixel\n * deviations in the `ClientRect` returned by the browser (e.g. when zoomed in with a percentage\n * size, see #21350).\n /\nfunction getRoundedBoundingClientRect(clientRect: ClientRect): ClientRect {\n return {\n top: Math.floor(clientRect.top),\n right: Math.floor(clientRect.right),\n bottom: Math.floor(clientRect.bottom),\n left: Math.floor(clientRect.left),\n width: Math.floor(clientRect.width),\n height: Math.floor(clientRect.height)\n };\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Direction} from '@angular/cdk/bidi';\nimport {Platform} from '@angular/cdk/platform';\nimport {CdkScrollable, ViewportRuler} from '@angular/cdk/scrolling';\nimport {ElementRef} from '@angular/core';\nimport {Observable} from 'rxjs';\n\nimport {OverlayContainer} from '../overlay-container';\nimport {OverlayReference} from '../overlay-reference';\n\nimport {\n ConnectedOverlayPositionChange,\n ConnectionPositionPair,\n OriginConnectionPosition,\n OverlayConnectionPosition,\n} from './connected-position';\nimport {FlexibleConnectedPositionStrategy} from './flexible-connected-position-strategy';\nimport {PositionStrategy} from './position-strategy';\n\n/\n A strategy for positioning overlays. Using this strategy, an overlay is given an\n * implicit position relative to some origin element. The relative position is defined in terms of\n * a point on the origin element that is connected to a point on the overlay element. For example,\n * a basic dropdown is connecting the bottom-left corner of the origin to the top-left corner\n * of the overlay.\n * @deprecated Use `FlexibleConnectedPositionStrategy` instead.\n * @breaking-change 8.0.0\n /\nexport class ConnectedPositionStrategy implements PositionStrategy {\n /\n Reference to the underlying position strategy to which all the API calls are proxied.\n * @docs-private\n /\n _positionStrategy: FlexibleConnectedPositionStrategy;\n\n /* The overlay to which this strategy is attached. /\n private _overlayRef: OverlayReference;\n\n private _direction: Direction \| null;\n\n /* Ordered list of preferred positions, from most to least desirable. /\n _preferredPositions: ConnectionPositionPair[] = [];\n\n /* Emits an event when the connection point changes. /\n readonly onPositionChange: Observable<ConnectedOverlayPositionChange>;\n\n constructor(\n originPos: OriginConnectionPosition, overlayPos: OverlayConnectionPosition,\n connectedTo: ElementRef<HTMLElement>, viewportRuler: ViewportRuler, document: Document,\n platform: Platform, overlayContainer: OverlayContainer) {\n // Since the `ConnectedPositionStrategy` is deprecated and we don't want to maintain\n // the extra logic, we create an instance of the positioning strategy that has some\n // defaults that make it behave as the old position strategy and to which we'll\n // proxy all of the API calls.\n this._positionStrategy = new FlexibleConnectedPositionStrategy(\n connectedTo, viewportRuler, document, platform, overlayContainer)\n .withFlexibleDimensions(false)\n .withPush(false)\n .withViewportMargin(0);\n\n this.withFallbackPosition(originPos, overlayPos);\n this.onPositionChange = this._positionStrategy.positionChanges;\n }\n\n /* Ordered list of preferred positions, from most to least desirable. /\n get positions(): ConnectionPositionPair[] {\n return this._preferredPositions;\n }\n\n /* Attach this position strategy to an overlay. /\n attach(overlayRef: OverlayReference): void {\n this._overlayRef = overlayRef;\n this._positionStrategy.attach(overlayRef);\n\n if (this._direction) {\n overlayRef.setDirection(this._direction);\n this._direction = null;\n }\n }\n\n /* Disposes all resources used by the position strategy. /\n dispose() {\n this._positionStrategy.dispose();\n }\n\n /* @docs-private /\n detach() {\n this._positionStrategy.detach();\n }\n\n /\n Updates the position of the overlay element, using whichever preferred position relative\n * to the origin fits on-screen.\n * @docs-private\n /\n apply(): void {\n this._positionStrategy.apply();\n }\n\n /\n Re-positions the overlay element with the trigger in its last calculated position,\n * even if a position higher in the \"preferred positions\" list would now fit. This\n * allows one to re-align the panel without changing the orientation of the panel.\n /\n recalculateLastPosition(): void {\n this._positionStrategy.reapplyLastPosition();\n }\n\n /\n Sets the list of Scrollable containers that host the origin element so that\n * on reposition we can evaluate if it or the overlay has been clipped or outside view. Every\n * Scrollable must be an ancestor element of the strategy's origin element.\n /\n withScrollableContainers(scrollables: CdkScrollable[]) {\n this._positionStrategy.withScrollableContainers(scrollables);\n }\n\n /\n Adds a new preferred fallback position.\n * @param originPos\n * @param overlayPos\n /\n withFallbackPosition(\n originPos: OriginConnectionPosition,\n overlayPos: OverlayConnectionPosition,\n offsetX?: number,\n offsetY?: number): this {\n\n const position = new ConnectionPositionPair(originPos, overlayPos, offsetX, offsetY);\n this._preferredPositions.push(position);\n this._positionStrategy.withPositions(this._preferredPositions);\n return this;\n }\n\n /\n Sets the layout direction so the overlay's position can be adjusted to match.\n * @param dir New layout direction.\n /\n withDirection(dir: 'ltr' \| 'rtl'): this {\n // Since the direction might be declared before the strategy is attached,\n // we save the value in a temporary property and we'll transfer it to the\n // overlay ref on attachment.\n if (this._overlayRef) {\n this._overlayRef.setDirection(dir);\n } else {\n this._direction = dir;\n }\n\n return this;\n }\n\n /\n Sets an offset for the overlay's connection point on the x-axis\n * @param offset New offset in the X axis.\n /\n withOffsetX(offset: number): this {\n this._positionStrategy.withDefaultOffsetX(offset);\n return this;\n }\n\n /\n Sets an offset for the overlay's connection point on the y-axis\n * @param offset New offset in the Y axis.\n /\n withOffsetY(offset: number): this {\n this._positionStrategy.withDefaultOffsetY(offset);\n return this;\n }\n\n /\n Sets whether the overlay's position should be locked in after it is positioned\n * initially. When an overlay is locked in, it won't attempt to reposition itself\n * when the position is re-applied (e.g. when the user scrolls away).\n * @param isLocked Whether the overlay should locked in.\n /\n withLockedPosition(isLocked: boolean): this {\n this._positionStrategy.withLockedPosition(isLocked);\n return this;\n }\n\n /\n Overwrites the current set of positions with an array of new ones.\n * @param positions Position pairs to be set on the strategy.\n /\n withPositions(positions: ConnectionPositionPair[]): this {\n this._preferredPositions = positions.slice();\n this._positionStrategy.withPositions(this._preferredPositions);\n return this;\n }\n\n /\n Sets the origin element, relative to which to position the overlay.\n * @param origin Reference to the new origin element.\n /\n setOrigin(origin: ElementRef): this {\n this._positionStrategy.setOrigin(origin);\n return this;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {PositionStrategy} from './position-strategy';\nimport {OverlayReference} from '../overlay-reference';\n\n/* Class to be added to the overlay pane wrapper. /\nconst wrapperClass = 'cdk-global-overlay-wrapper';\n\n/\n A strategy for positioning overlays. Using this strategy, an overlay is given an\n * explicit position relative to the browser's viewport. We use flexbox, instead of\n * transforms, in order to avoid issues with subpixel rendering which can cause the\n * element to become blurry.\n /\nexport class GlobalPositionStrategy implements PositionStrategy {\n /* The overlay to which this strategy is attached. /\n private _overlayRef: OverlayReference;\n private _cssPosition: string = 'static';\n private _topOffset: string = '';\n private _bottomOffset: string = '';\n private _leftOffset: string = '';\n private _rightOffset: string = '';\n private _alignItems: string = '';\n private _justifyContent: string = '';\n private _width: string = '';\n private _height: string = '';\n private _isDisposed: boolean;\n\n attach(overlayRef: OverlayReference): void {\n const config = overlayRef.getConfig();\n\n this._overlayRef = overlayRef;\n\n if (this._width && !config.width) {\n overlayRef.updateSize({width: this._width});\n }\n\n if (this._height && !config.height) {\n overlayRef.updateSize({height: this._height});\n }\n\n overlayRef.hostElement.classList.add(wrapperClass);\n this._isDisposed = false;\n }\n\n /\n Sets the top position of the overlay. Clears any previously set vertical position.\n * @param value New top offset.\n /\n top(value: string = ''): this {\n this._bottomOffset = '';\n this._topOffset = value;\n this._alignItems = 'flex-start';\n return this;\n }\n\n /\n Sets the left position of the overlay. Clears any previously set horizontal position.\n * @param value New left offset.\n /\n left(value: string = ''): this {\n this._rightOffset = '';\n this._leftOffset = value;\n this._justifyContent = 'flex-start';\n return this;\n }\n\n /\n Sets the bottom position of the overlay. Clears any previously set vertical position.\n * @param value New bottom offset.\n /\n bottom(value: string = ''): this {\n this._topOffset = '';\n this._bottomOffset = value;\n this._alignItems = 'flex-end';\n return this;\n }\n\n /\n Sets the right position of the overlay. Clears any previously set horizontal position.\n * @param value New right offset.\n /\n right(value: string = ''): this {\n this._leftOffset = '';\n this._rightOffset = value;\n this._justifyContent = 'flex-end';\n return this;\n }\n\n /\n Sets the overlay width and clears any previously set width.\n * @param value New width for the overlay\n * @deprecated Pass the `width` through the `OverlayConfig`.\n * @breaking-change 8.0.0\n /\n width(value: string = ''): this {\n if (this._overlayRef) {\n this._overlayRef.updateSize({width: value});\n } else {\n this._width = value;\n }\n\n return this;\n }\n\n /\n Sets the overlay height and clears any previously set height.\n * @param value New height for the overlay\n * @deprecated Pass the `height` through the `OverlayConfig`.\n * @breaking-change 8.0.0\n /\n height(value: string = ''): this {\n if (this._overlayRef) {\n this._overlayRef.updateSize({height: value});\n } else {\n this._height = value;\n }\n\n return this;\n }\n\n /\n Centers the overlay horizontally with an optional offset.\n * Clears any previously set horizontal position.\n \n @param offset Overlay offset from the horizontal center.\n /\n centerHorizontally(offset: string = ''): this {\n this.left(offset);\n this._justifyContent = 'center';\n return this;\n }\n\n /\n Centers the overlay vertically with an optional offset.\n * Clears any previously set vertical position.\n \n @param offset Overlay offset from the vertical center.\n /\n centerVertically(offset: string = ''): this {\n this.top(offset);\n this._alignItems = 'center';\n return this;\n }\n\n /\n Apply the position to the element.\n * @docs-private\n /\n apply(): void {\n // Since the overlay ref applies the strategy asynchronously, it could\n // have been disposed before it ends up being applied. If that is the\n // case, we shouldn't do anything.\n if (!this._overlayRef \|\| !this._overlayRef.hasAttached()) {\n return;\n }\n\n const styles = this._overlayRef.overlayElement.style;\n const parentStyles = this._overlayRef.hostElement.style;\n const config = this._overlayRef.getConfig();\n const {width, height, maxWidth, maxHeight} = config;\n const shouldBeFlushHorizontally = (width === '100%' \|\| width === '100vw') &&\n (!maxWidth \|\| maxWidth === '100%' \|\| maxWidth === '100vw');\n const shouldBeFlushVertically = (height === '100%' \|\| height === '100vh') &&\n (!maxHeight \|\| maxHeight === '100%' \|\| maxHeight === '100vh');\n\n styles.position = this._cssPosition;\n styles.marginLeft = shouldBeFlushHorizontally ? '0' : this._leftOffset;\n styles.marginTop = shouldBeFlushVertically ? '0' : this._topOffset;\n styles.marginBottom = this._bottomOffset;\n styles.marginRight = this._rightOffset;\n\n if (shouldBeFlushHorizontally) {\n parentStyles.justifyContent = 'flex-start';\n } else if (this._justifyContent === 'center') {\n parentStyles.justifyContent = 'center';\n } else if (this._overlayRef.getConfig().direction === 'rtl') {\n // In RTL the browser will invert `flex-start` and `flex-end` automatically, but we\n // don't want that because our positioning is explicitly `left` and `right`, hence\n // why we do another inversion to ensure that the overlay stays in the same position.\n // TODO: reconsider this if we add `start` and `end` methods.\n if (this._justifyContent === 'flex-start') {\n parentStyles.justifyContent = 'flex-end';\n } else if (this._justifyContent === 'flex-end') {\n parentStyles.justifyContent = 'flex-start';\n }\n } else {\n parentStyles.justifyContent = this._justifyContent;\n }\n\n parentStyles.alignItems = shouldBeFlushVertically ? 'flex-start' : this._alignItems;\n }\n\n /\n Cleans up the DOM changes from the position strategy.\n * @docs-private\n /\n dispose(): void {\n if (this._isDisposed \|\| !this._overlayRef) {\n return;\n }\n\n const styles = this._overlayRef.overlayElement.style;\n const parent = this._overlayRef.hostElement;\n const parentStyles = parent.style;\n\n parent.classList.remove(wrapperClass);\n parentStyles.justifyContent = parentStyles.alignItems = styles.marginTop =\n styles.marginBottom = styles.marginLeft = styles.marginRight = styles.position = '';\n\n this._overlayRef = null!;\n this._isDisposed = true;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Platform} from '@angular/cdk/platform';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {DOCUMENT} from '@angular/common';\nimport {ElementRef, Inject, Injectable} from '@angular/core';\n\nimport {OverlayContainer} from '../overlay-container';\n\nimport {OriginConnectionPosition, OverlayConnectionPosition} from './connected-position';\nimport {ConnectedPositionStrategy} from './connected-position-strategy';\nimport {\n FlexibleConnectedPositionStrategy,\n FlexibleConnectedPositionStrategyOrigin,\n} from './flexible-connected-position-strategy';\nimport {GlobalPositionStrategy} from './global-position-strategy';\n\n\n/* Builder for overlay position strategy. /\n@Injectable({providedIn: 'root'})\nexport class OverlayPositionBuilder {\n constructor(\n private _viewportRuler: ViewportRuler, @Inject(DOCUMENT) private _document: any,\n private _platform: Platform, private _overlayContainer: OverlayContainer) {}\n\n /\n Creates a global position strategy.\n /\n global(): GlobalPositionStrategy {\n return new GlobalPositionStrategy();\n }\n\n /\n Creates a relative position strategy.\n * @param elementRef\n * @param originPos\n * @param overlayPos\n * @deprecated Use `flexibleConnectedTo` instead.\n * @breaking-change 8.0.0\n /\n connectedTo(\n elementRef: ElementRef,\n originPos: OriginConnectionPosition,\n overlayPos: OverlayConnectionPosition): ConnectedPositionStrategy {\n return new ConnectedPositionStrategy(\n originPos, overlayPos, elementRef, this._viewportRuler, this._document, this._platform,\n this._overlayContainer);\n }\n\n /\n Creates a flexible position strategy.\n * @param origin Origin relative to which to position the overlay.\n /\n flexibleConnectedTo(origin: FlexibleConnectedPositionStrategyOrigin):\n FlexibleConnectedPositionStrategy {\n return new FlexibleConnectedPositionStrategy(origin, this._viewportRuler, this._document,\n this._platform, this._overlayContainer);\n }\n\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Directionality} from '@angular/cdk/bidi';\nimport {DomPortalOutlet} from '@angular/cdk/portal';\nimport {DOCUMENT, Location} from '@angular/common';\nimport {\n ApplicationRef,\n ComponentFactoryResolver,\n Inject,\n Injectable,\n Injector,\n NgZone,\n} from '@angular/core';\nimport {OverlayKeyboardDispatcher} from './dispatchers/overlay-keyboard-dispatcher';\nimport {OverlayOutsideClickDispatcher} from './dispatchers/overlay-outside-click-dispatcher';\nimport {OverlayConfig} from './overlay-config';\nimport {OverlayContainer} from './overlay-container';\nimport {OverlayRef} from './overlay-ref';\nimport {OverlayPositionBuilder} from './position/overlay-position-builder';\nimport {ScrollStrategyOptions} from './scroll/index';\n\n\n/* Next overlay unique ID. /\nlet nextUniqueId = 0;\n\n// Note that Overlay is not* scoped to the app root because of the ComponentFactoryResolver\n// which needs to be different depending on where OverlayModule is imported.\n\n/*\n Service to create Overlays. Overlays are dynamically added pieces of floating UI, meant to be\n * used as a low-level building block for other components. Dialogs, tooltips, menus,\n * selects, etc. can all be built using overlays. The service should primarily be used by authors\n * of re-usable components rather than developers building end-user applications.\n \n An overlay is a PortalOutlet, so any kind of Portal can be loaded into one.\n /\n@Injectable()\nexport class Overlay {\n private _appRef: ApplicationRef;\n\n constructor(\n /* Scrolling strategies that can be used when creating an overlay. /\n public scrollStrategies: ScrollStrategyOptions,\n private _overlayContainer: OverlayContainer,\n private _componentFactoryResolver: ComponentFactoryResolver,\n private _positionBuilder: OverlayPositionBuilder,\n private _keyboardDispatcher: OverlayKeyboardDispatcher,\n private _injector: Injector,\n private _ngZone: NgZone,\n @Inject(DOCUMENT) private _document: any,\n private _directionality: Directionality,\n private _location: Location,\n private _outsideClickDispatcher: OverlayOutsideClickDispatcher) { }\n\n /\n Creates an overlay.\n * @param config Configuration applied to the overlay.\n * @returns Reference to the created overlay.\n /\n create(config?: OverlayConfig): OverlayRef {\n const host = this._createHostElement();\n const pane = this._createPaneElement(host);\n const portalOutlet = this._createPortalOutlet(pane);\n const overlayConfig = new OverlayConfig(config);\n\n overlayConfig.direction = overlayConfig.direction \|\| this._directionality.value;\n\n return new OverlayRef(portalOutlet, host, pane, overlayConfig, this._ngZone,\n this._keyboardDispatcher, this._document, this._location, this._outsideClickDispatcher);\n }\n\n /\n Gets a position builder that can be used, via fluent API,\n * to construct and configure a position strategy.\n * @returns An overlay position builder.\n /\n position(): OverlayPositionBuilder {\n return this._positionBuilder;\n }\n\n /\n Creates the DOM element for an overlay and appends it to the overlay container.\n * @returns Newly-created pane element\n /\n private _createPaneElement(host: HTMLElement): HTMLElement {\n const pane = this._document.createElement('div');\n\n pane.id = `cdk-overlay-${nextUniqueId++}`;\n pane.classList.add('cdk-overlay-pane');\n host.appendChild(pane);\n\n return pane;\n }\n\n /\n Creates the host element that wraps around an overlay\n * and can be used for advanced positioning.\n * @returns Newly-create host element.\n /\n private _createHostElement(): HTMLElement {\n const host = this._document.createElement('div');\n this._overlayContainer.getContainerElement().appendChild(host);\n return host;\n }\n\n /\n Create a DomPortalOutlet into which the overlay content can be loaded.\n * @param pane The DOM element to turn into a portal outlet.\n * @returns A portal outlet for the given DOM element.\n /\n private _createPortalOutlet(pane: HTMLElement): DomPortalOutlet {\n // We have to resolve the ApplicationRef later in order to allow people\n // to use overlay-based providers during app initialization.\n if (!this._appRef) {\n this._appRef = this._injector.get<ApplicationRef>(ApplicationRef);\n }\n\n return new DomPortalOutlet(pane, this._componentFactoryResolver, this._appRef, this._injector,\n this._document);\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Direction, Directionality} from '@angular/cdk/bidi';\nimport {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {ESCAPE, hasModifierKey} from '@angular/cdk/keycodes';\nimport {TemplatePortal} from '@angular/cdk/portal';\nimport {\n Directive,\n ElementRef,\n EventEmitter,\n Inject,\n InjectionToken,\n Input,\n OnChanges,\n OnDestroy,\n Optional,\n Output,\n SimpleChanges,\n TemplateRef,\n ViewContainerRef,\n} from '@angular/core';\nimport {Subscription} from 'rxjs';\nimport {takeWhile} from 'rxjs/operators';\nimport {Overlay} from './overlay';\nimport {OverlayConfig} from './overlay-config';\nimport {OverlayRef} from './overlay-ref';\nimport {ConnectedOverlayPositionChange} from './position/connected-position';\nimport {\n ConnectedPosition,\n FlexibleConnectedPositionStrategy,\n} from './position/flexible-connected-position-strategy';\nimport {\n RepositionScrollStrategy,\n ScrollStrategy,\n} from './scroll/index';\n\n\n/* Default set of positions for the overlay. Follows the behavior of a dropdown. /\nconst defaultPositionList: ConnectedPosition[] = [\n {\n originX: 'start',\n originY: 'bottom',\n overlayX: 'start',\n overlayY: 'top'\n },\n {\n originX: 'start',\n originY: 'top',\n overlayX: 'start',\n overlayY: 'bottom'\n },\n {\n originX: 'end',\n originY: 'top',\n overlayX: 'end',\n overlayY: 'bottom'\n },\n {\n originX: 'end',\n originY: 'bottom',\n overlayX: 'end',\n overlayY: 'top'\n }\n];\n\n/* Injection token that determines the scroll handling while the connected overlay is open. /\nexport const CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY =\n new InjectionToken<() => ScrollStrategy>('cdk-connected-overlay-scroll-strategy');\n\n/\n Directive applied to an element to make it usable as an origin for an Overlay using a\n * ConnectedPositionStrategy.\n /\n@Directive({\n selector: '[cdk-overlay-origin], [overlay-origin], [cdkOverlayOrigin]',\n exportAs: 'cdkOverlayOrigin',\n})\nexport class CdkOverlayOrigin {\n constructor(\n /* Reference to the element on which the directive is applied. /\n public elementRef: ElementRef) { }\n}\n\n\n/\n Directive to facilitate declarative creation of an\n * Overlay using a FlexibleConnectedPositionStrategy.\n /\n@Directive({\n selector: '[cdk-connected-overlay], [connected-overlay], [cdkConnectedOverlay]',\n exportAs: 'cdkConnectedOverlay'\n})\nexport class CdkConnectedOverlay implements OnDestroy, OnChanges {\n private _overlayRef: OverlayRef;\n private _templatePortal: TemplatePortal;\n private _hasBackdrop = false;\n private _lockPosition = false;\n private _growAfterOpen = false;\n private _flexibleDimensions = false;\n private _push = false;\n private _backdropSubscription = Subscription.EMPTY;\n private _attachSubscription = Subscription.EMPTY;\n private _detachSubscription = Subscription.EMPTY;\n private _positionSubscription = Subscription.EMPTY;\n private _offsetX: number;\n private _offsetY: number;\n private _position: FlexibleConnectedPositionStrategy;\n private _scrollStrategyFactory: () => ScrollStrategy;\n\n /* Origin for the connected overlay. /\n @Input('cdkConnectedOverlayOrigin') origin: CdkOverlayOrigin;\n\n /* Registered connected position pairs. /\n @Input('cdkConnectedOverlayPositions') positions: ConnectedPosition[];\n\n /\n This input overrides the positions input if specified. It lets users pass\n * in arbitrary positioning strategies.\n /\n @Input('cdkConnectedOverlayPositionStrategy') positionStrategy: FlexibleConnectedPositionStrategy;\n\n /* The offset in pixels for the overlay connection point on the x-axis /\n @Input('cdkConnectedOverlayOffsetX')\n get offsetX(): number { return this._offsetX; }\n set offsetX(offsetX: number) {\n this._offsetX = offsetX;\n\n if (this._position) {\n this._updatePositionStrategy(this._position);\n }\n }\n\n /* The offset in pixels for the overlay connection point on the y-axis /\n @Input('cdkConnectedOverlayOffsetY')\n get offsetY() { return this._offsetY; }\n set offsetY(offsetY: number) {\n this._offsetY = offsetY;\n\n if (this._position) {\n this._updatePositionStrategy(this._position);\n }\n }\n\n /* The width of the overlay panel. /\n @Input('cdkConnectedOverlayWidth') width: number \| string;\n\n /* The height of the overlay panel. /\n @Input('cdkConnectedOverlayHeight') height: number \| string;\n\n /* The min width of the overlay panel. /\n @Input('cdkConnectedOverlayMinWidth') minWidth: number \| string;\n\n /* The min height of the overlay panel. /\n @Input('cdkConnectedOverlayMinHeight') minHeight: number \| string;\n\n /* The custom class to be set on the backdrop element. /\n @Input('cdkConnectedOverlayBackdropClass') backdropClass: string;\n\n /* The custom class to add to the overlay pane element. /\n @Input('cdkConnectedOverlayPanelClass') panelClass: string \| string[];\n\n /* Margin between the overlay and the viewport edges. /\n @Input('cdkConnectedOverlayViewportMargin') viewportMargin: number = 0;\n\n /* Strategy to be used when handling scroll events while the overlay is open. /\n @Input('cdkConnectedOverlayScrollStrategy') scrollStrategy: ScrollStrategy;\n\n /* Whether the overlay is open. /\n @Input('cdkConnectedOverlayOpen') open: boolean = false;\n\n /* Whether the overlay can be closed by user interaction. /\n @Input('cdkConnectedOverlayDisableClose') disableClose: boolean = false;\n\n /* CSS selector which to set the transform origin. /\n @Input('cdkConnectedOverlayTransformOriginOn') transformOriginSelector: string;\n\n /* Whether or not the overlay should attach a backdrop. /\n @Input('cdkConnectedOverlayHasBackdrop')\n get hasBackdrop() { return this._hasBackdrop; }\n set hasBackdrop(value: any) { this._hasBackdrop = coerceBooleanProperty(value); }\n\n /* Whether or not the overlay should be locked when scrolling. /\n @Input('cdkConnectedOverlayLockPosition')\n get lockPosition() { return this._lockPosition; }\n set lockPosition(value: any) { this._lockPosition = coerceBooleanProperty(value); }\n\n /* Whether the overlay's width and height can be constrained to fit within the viewport. /\n @Input('cdkConnectedOverlayFlexibleDimensions')\n get flexibleDimensions() { return this._flexibleDimensions; }\n set flexibleDimensions(value: boolean) {\n this._flexibleDimensions = coerceBooleanProperty(value);\n }\n\n /* Whether the overlay can grow after the initial open when flexible positioning is turned on. /\n @Input('cdkConnectedOverlayGrowAfterOpen')\n get growAfterOpen() { return this._growAfterOpen; }\n set growAfterOpen(value: boolean) { this._growAfterOpen = coerceBooleanProperty(value); }\n\n /* Whether the overlay can be pushed on-screen if none of the provided positions fit. /\n @Input('cdkConnectedOverlayPush')\n get push() { return this._push; }\n set push(value: boolean) { this._push = coerceBooleanProperty(value); }\n\n /* Event emitted when the backdrop is clicked. /\n @Output() readonly backdropClick = new EventEmitter<MouseEvent>();\n\n /* Event emitted when the position has changed. /\n @Output() readonly positionChange = new EventEmitter<ConnectedOverlayPositionChange>();\n\n /* Event emitted when the overlay has been attached. /\n @Output() readonly attach = new EventEmitter<void>();\n\n /* Event emitted when the overlay has been detached. /\n @Output() readonly detach = new EventEmitter<void>();\n\n /* Emits when there are keyboard events that are targeted at the overlay. /\n @Output() readonly overlayKeydown = new EventEmitter<KeyboardEvent>();\n\n /* Emits when there are mouse outside click events that are targeted at the overlay. /\n @Output() readonly overlayOutsideClick = new EventEmitter<MouseEvent>();\n\n // TODO(jelbourn): inputs for size, scroll behavior, animation, etc.\n\n constructor(\n private _overlay: Overlay,\n templateRef: TemplateRef<any>,\n viewContainerRef: ViewContainerRef,\n @Inject(CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY) scrollStrategyFactory: any,\n @Optional() private _dir: Directionality) {\n this._templatePortal = new TemplatePortal(templateRef, viewContainerRef);\n this._scrollStrategyFactory = scrollStrategyFactory;\n this.scrollStrategy = this._scrollStrategyFactory();\n }\n\n /* The associated overlay reference. /\n get overlayRef(): OverlayRef {\n return this._overlayRef;\n }\n\n /* The element's layout direction. /\n get dir(): Direction {\n return this._dir ? this._dir.value : 'ltr';\n }\n\n ngOnDestroy() {\n this._attachSubscription.unsubscribe();\n this._detachSubscription.unsubscribe();\n this._backdropSubscription.unsubscribe();\n this._positionSubscription.unsubscribe();\n\n if (this._overlayRef) {\n this._overlayRef.dispose();\n }\n }\n\n ngOnChanges(changes: SimpleChanges) {\n if (this._position) {\n this._updatePositionStrategy(this._position);\n this._overlayRef.updateSize({\n width: this.width,\n minWidth: this.minWidth,\n height: this.height,\n minHeight: this.minHeight,\n });\n\n if (changes['origin'] && this.open) {\n this._position.apply();\n }\n }\n\n if (changes['open']) {\n this.open ? this._attachOverlay() : this._detachOverlay();\n }\n }\n\n /* Creates an overlay /\n private _createOverlay() {\n if (!this.positions \|\| !this.positions.length) {\n this.positions = defaultPositionList;\n }\n\n const overlayRef = this._overlayRef = this._overlay.create(this._buildConfig());\n this._attachSubscription = overlayRef.attachments().subscribe(() => this.attach.emit());\n this._detachSubscription = overlayRef.detachments().subscribe(() => this.detach.emit());\n overlayRef.keydownEvents().subscribe((event: KeyboardEvent) => {\n this.overlayKeydown.next(event);\n\n if (event.keyCode === ESCAPE && !this.disableClose && !hasModifierKey(event)) {\n event.preventDefault();\n this._detachOverlay();\n }\n });\n\n this._overlayRef.outsidePointerEvents().subscribe((event: MouseEvent) => {\n this.overlayOutsideClick.next(event);\n });\n }\n\n /* Builds the overlay config based on the directive's inputs /\n private _buildConfig(): OverlayConfig {\n const positionStrategy = this._position =\n this.positionStrategy \|\| this._createPositionStrategy();\n const overlayConfig = new OverlayConfig({\n direction: this._dir,\n positionStrategy,\n scrollStrategy: this.scrollStrategy,\n hasBackdrop: this.hasBackdrop\n });\n\n if (this.width \|\| this.width === 0) {\n overlayConfig.width = this.width;\n }\n\n if (this.height \|\| this.height === 0) {\n overlayConfig.height = this.height;\n }\n\n if (this.minWidth \|\| this.minWidth === 0) {\n overlayConfig.minWidth = this.minWidth;\n }\n\n if (this.minHeight \|\| this.minHeight === 0) {\n overlayConfig.minHeight = this.minHeight;\n }\n\n if (this.backdropClass) {\n overlayConfig.backdropClass = this.backdropClass;\n }\n\n if (this.panelClass) {\n overlayConfig.panelClass = this.panelClass;\n }\n\n return overlayConfig;\n }\n\n /* Updates the state of a position strategy, based on the values of the directive inputs. /\n private _updatePositionStrategy(positionStrategy: FlexibleConnectedPositionStrategy) {\n const positions: ConnectedPosition[] = this.positions.map(currentPosition => ({\n originX: currentPosition.originX,\n originY: currentPosition.originY,\n overlayX: currentPosition.overlayX,\n overlayY: currentPosition.overlayY,\n offsetX: currentPosition.offsetX \|\| this.offsetX,\n offsetY: currentPosition.offsetY \|\| this.offsetY,\n panelClass: currentPosition.panelClass \|\| undefined,\n }));\n\n return positionStrategy\n .setOrigin(this.origin.elementRef)\n .withPositions(positions)\n .withFlexibleDimensions(this.flexibleDimensions)\n .withPush(this.push)\n .withGrowAfterOpen(this.growAfterOpen)\n .withViewportMargin(this.viewportMargin)\n .withLockedPosition(this.lockPosition)\n .withTransformOriginOn(this.transformOriginSelector);\n }\n\n /* Returns the position strategy of the overlay to be set on the overlay config /\n private _createPositionStrategy(): FlexibleConnectedPositionStrategy {\n const strategy = this._overlay.position().flexibleConnectedTo(this.origin.elementRef);\n this._updatePositionStrategy(strategy);\n return strategy;\n }\n\n /* Attaches the overlay and subscribes to backdrop clicks if backdrop exists /\n private _attachOverlay() {\n if (!this._overlayRef) {\n this._createOverlay();\n } else {\n // Update the overlay size, in case the directive's inputs have changed\n this._overlayRef.getConfig().hasBackdrop = this.hasBackdrop;\n }\n\n if (!this._overlayRef.hasAttached()) {\n this._overlayRef.attach(this._templatePortal);\n }\n\n if (this.hasBackdrop) {\n this._backdropSubscription = this._overlayRef.backdropClick().subscribe(event => {\n this.backdropClick.emit(event);\n });\n } else {\n this._backdropSubscription.unsubscribe();\n }\n\n this._positionSubscription.unsubscribe();\n\n // Only subscribe to `positionChanges` if requested, because putting\n // together all the information for it can be expensive.\n if (this.positionChange.observers.length > 0) {\n this._positionSubscription = this._position.positionChanges\n .pipe(takeWhile(() => this.positionChange.observers.length > 0))\n .subscribe(position => {\n this.positionChange.emit(position);\n\n if (this.positionChange.observers.length === 0) {\n this._positionSubscription.unsubscribe();\n }\n });\n }\n }\n\n /* Detaches the overlay and unsubscribes to backdrop clicks if backdrop exists /\n private _detachOverlay() {\n if (this._overlayRef) {\n this._overlayRef.detach();\n }\n\n this._backdropSubscription.unsubscribe();\n this._positionSubscription.unsubscribe();\n }\n\n static ngAcceptInputType_hasBackdrop: BooleanInput;\n static ngAcceptInputType_lockPosition: BooleanInput;\n static ngAcceptInputType_flexibleDimensions: BooleanInput;\n static ngAcceptInputType_growAfterOpen: BooleanInput;\n static ngAcceptInputType_push: BooleanInput;\n}\n\n\n/* @docs-private /\nexport function CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER_FACTORY(overlay: Overlay):\n () => RepositionScrollStrategy {\n return () => overlay.scrollStrategies.reposition();\n}\n\n/* @docs-private /\nexport const CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER = {\n provide: CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY,\n deps: [Overlay],\n useFactory: CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER_FACTORY,\n};\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {BidiModule} from '@angular/cdk/bidi';\nimport {PortalModule} from '@angular/cdk/portal';\nimport {ScrollingModule} from '@angular/cdk/scrolling';\nimport {NgModule} from '@angular/core';\nimport {Overlay} from './overlay';\nimport {\n CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER,\n CdkConnectedOverlay,\n CdkOverlayOrigin,\n} from './overlay-directives';\n\n\n@NgModule({\n imports: [BidiModule, PortalModule, ScrollingModule],\n exports: [CdkConnectedOverlay, CdkOverlayOrigin, ScrollingModule],\n declarations: [CdkConnectedOverlay, CdkOverlayOrigin],\n providers: [\n Overlay,\n CDK_CONNECTED_OVERLAY_SCROLL_STRATEGY_PROVIDER,\n ],\n})\nexport class OverlayModule {}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nexport {OverlayOutsideClickDispatcher} from './overlay-outside-click-dispatcher';\nexport {OverlayKeyboardDispatcher} from './overlay-keyboard-dispatcher';\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nimport {Injectable, Inject, OnDestroy} from '@angular/core';\nimport {OverlayContainer} from './overlay-container';\nimport {DOCUMENT} from '@angular/common';\nimport {Platform} from '@angular/cdk/platform';\n\n\n/\n Alternative to OverlayContainer that supports correct displaying of overlay elements in\n * Fullscreen mode\n * https://developer.mozilla.org/en-US/docs/Web/API/Element/requestFullScreen\n \n Should be provided in the root component.\n /\n@Injectable({providedIn: 'root'})\nexport class FullscreenOverlayContainer extends OverlayContainer implements OnDestroy {\n private _fullScreenEventName: string \| undefined;\n private _fullScreenListener: () => void;\n\n constructor(@Inject(DOCUMENT) _document: any, platform: Platform) {\n super(_document, platform);\n }\n\n override ngOnDestroy() {\n super.ngOnDestroy();\n\n if (this._fullScreenEventName && this._fullScreenListener) {\n this._document.removeEventListener(this._fullScreenEventName, this._fullScreenListener);\n }\n }\n\n protected override _createContainer(): void {\n super._createContainer();\n this._adjustParentForFullscreenChange();\n this._addFullscreenChangeListener(() => this._adjustParentForFullscreenChange());\n }\n\n private _adjustParentForFullscreenChange(): void {\n if (!this._containerElement) {\n return;\n }\n\n const fullscreenElement = this.getFullscreenElement();\n const parent = fullscreenElement \|\| this._document.body;\n parent.appendChild(this._containerElement);\n }\n\n private _addFullscreenChangeListener(fn: () => void) {\n const eventName = this._getEventName();\n\n if (eventName) {\n if (this._fullScreenListener) {\n this._document.removeEventListener(eventName, this._fullScreenListener);\n }\n\n this._document.addEventListener(eventName, fn);\n this._fullScreenListener = fn;\n }\n }\n\n private _getEventName(): string \| undefined {\n if (!this._fullScreenEventName) {\n const _document = this._document as any;\n\n if (_document.fullscreenEnabled) {\n this._fullScreenEventName = 'fullscreenchange';\n } else if (_document.webkitFullscreenEnabled) {\n this._fullScreenEventName = 'webkitfullscreenchange';\n } else if (_document.mozFullScreenEnabled) {\n this._fullScreenEventName = 'mozfullscreenchange';\n } else if (_document.msFullscreenEnabled) {\n this._fullScreenEventName = 'MSFullscreenChange';\n }\n }\n\n return this._fullScreenEventName;\n }\n\n /\n When the page is put into fullscreen mode, a specific element is specified.\n * Only that element and its children are visible when in fullscreen mode.\n /\n getFullscreenElement(): Element {\n const _document = this._document as any;\n\n return _document.fullscreenElement \|\|\n _document.webkitFullscreenElement \|\|\n _document.mozFullScreenElement \|\|\n _document.msFullscreenElement \|\|\n null;\n }\n}\n","/\n @license\n * Copyright Google LLC All Rights Reserved.\n \n Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n /\n\nexport from './overlay-config';\nexport * from './position/connected-position';\nexport * from './scroll/index';\nexport * from './overlay-module';\nexport * from './dispatchers/index';\nexport {Overlay} from './overlay';\nexport {OverlayContainer} from './overlay-container';\nexport {CdkOverlayOrigin, CdkConnectedOverlay} from './overlay-directives';\nexport {FullscreenOverlayContainer} from './fullscreen-overlay-container';\nexport {OverlayRef, OverlaySizeConfig} from './overlay-ref';\nexport {ViewportRuler} from '@angular/cdk/scrolling';\nexport {ComponentType} from '@angular/cdk/portal';\nexport {OverlayPositionBuilder} from './position/overlay-position-builder';\n\n// Export pre-defined position strategies and interface to build custom ones.\nexport {PositionStrategy} from './position/position-strategy';\nexport {GlobalPositionStrategy} from './position/global-position-strategy';\nexport {ConnectedPositionStrategy} from './position/connected-position-strategy';\nexport {\n ConnectedPosition,\n FlexibleConnectedPositionStrategy,\n FlexibleConnectedPositionStrategyOrigin,\n} from './position/flexible-connected-position-strategy';\n","/*\n Generated bundle index. 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