source: trip-planner-front/node_modules/@angular/cdk/esm2015/overlay/position/flexible-connected-position-strategy.js@ 6c1585f

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { ElementRef } from '@angular/core';
import { ConnectedOverlayPositionChange, validateHorizontalPosition, validateVerticalPosition, } from './connected-position';
import { Subscription, Subject } from 'rxjs';
import { isElementScrolledOutsideView, isElementClippedByScrolling } from './scroll-clip';
import { coerceCssPixelValue, coerceArray } from '@angular/cdk/coercion';
// TODO: refactor clipping detection into a separate thing (part of scrolling module)
// TODO: doesn't handle both flexible width and height when it has to scroll along both axis.
/** Class to be added to the overlay bounding box. */
const boundingBoxClass = 'cdk-overlay-connected-position-bounding-box';
/** Regex used to split a string on its CSS units. */
const cssUnitPattern = /([A-Za-z%]+)$/;
/**
 * A strategy for positioning overlays. Using this strategy, an overlay is given an
 * implicit position relative some origin element. The relative position is defined in terms of
 * a point on the origin element that is connected to a point on the overlay element. For example,
 * a basic dropdown is connecting the bottom-left corner of the origin to the top-left corner
 * of the overlay.
 */
export class FlexibleConnectedPositionStrategy {
    constructor(connectedTo, _viewportRuler, _document, _platform, _overlayContainer) {
        this._viewportRuler = _viewportRuler;
        this._document = _document;
        this._platform = _platform;
        this._overlayContainer = _overlayContainer;
        /** Last size used for the bounding box. Used to avoid resizing the overlay after open. */
        this._lastBoundingBoxSize = { width: 0, height: 0 };
        /** Whether the overlay was pushed in a previous positioning. */
        this._isPushed = false;
        /** Whether the overlay can be pushed on-screen on the initial open. */
        this._canPush = true;
        /** Whether the overlay can grow via flexible width/height after the initial open. */
        this._growAfterOpen = false;
        /** Whether the overlay's width and height can be constrained to fit within the viewport. */
        this._hasFlexibleDimensions = true;
        /** Whether the overlay position is locked. */
        this._positionLocked = false;
        /** Amount of space that must be maintained between the overlay and the edge of the viewport. */
        this._viewportMargin = 0;
        /** The Scrollable containers used to check scrollable view properties on position change. */
        this._scrollables = [];
        /** Ordered list of preferred positions, from most to least desirable. */
        this._preferredPositions = [];
        /** Subject that emits whenever the position changes. */
        this._positionChanges = new Subject();
        /** Subscription to viewport size changes. */
        this._resizeSubscription = Subscription.EMPTY;
        /** Default offset for the overlay along the x axis. */
        this._offsetX = 0;
        /** Default offset for the overlay along the y axis. */
        this._offsetY = 0;
        /** Keeps track of the CSS classes that the position strategy has applied on the overlay panel. */
        this._appliedPanelClasses = [];
        /** Observable sequence of position changes. */
        this.positionChanges = this._positionChanges;
        this.setOrigin(connectedTo);
    }
    /** Ordered list of preferred positions, from most to least desirable. */
    get positions() {
        return this._preferredPositions;
    }
    /** Attaches this position strategy to an overlay. */
    attach(overlayRef) {
        if (this._overlayRef && overlayRef !== this._overlayRef &&
            (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw Error('This position strategy is already attached to an overlay');
        }
        this._validatePositions();
        overlayRef.hostElement.classList.add(boundingBoxClass);
        this._overlayRef = overlayRef;
        this._boundingBox = overlayRef.hostElement;
        this._pane = overlayRef.overlayElement;
        this._isDisposed = false;
        this._isInitialRender = true;
        this._lastPosition = null;
        this._resizeSubscription.unsubscribe();
        this._resizeSubscription = this._viewportRuler.change().subscribe(() => {
            // When the window is resized, we want to trigger the next reposition as if it
            // was an initial render, in order for the strategy to pick a new optimal position,
            // otherwise position locking will cause it to stay at the old one.
            this._isInitialRender = true;
            this.apply();
        });
    }
    /**
     * Updates the position of the overlay element, using whichever preferred position relative
     * to the origin best fits on-screen.
     *
     * The selection of a position goes as follows:
     *  - If any positions fit completely within the viewport as-is,
     *      choose the first position that does so.
     *  - If flexible dimensions are enabled and at least one satifies the given minimum width/height,
     *      choose the position with the greatest available size modified by the positions' weight.
     *  - If pushing is enabled, take the position that went off-screen the least and push it
     *      on-screen.
     *  - If none of the previous criteria were met, use the position that goes off-screen the least.
     * @docs-private
     */
    apply() {
        // We shouldn't do anything if the strategy was disposed or we're on the server.
        if (this._isDisposed || !this._platform.isBrowser) {
            return;
        }
        // If the position has been applied already (e.g. when the overlay was opened) and the
        // consumer opted into locking in the position, re-use the old position, in order to
        // prevent the overlay from jumping around.
        if (!this._isInitialRender && this._positionLocked && this._lastPosition) {
            this.reapplyLastPosition();
            return;
        }
        this._clearPanelClasses();
        this._resetOverlayElementStyles();
        this._resetBoundingBoxStyles();
        // We need the bounding rects for the origin and the overlay to determine how to position
        // the overlay relative to the origin.
        // We use the viewport rect to determine whether a position would go off-screen.
        this._viewportRect = this._getNarrowedViewportRect();
        this._originRect = this._getOriginRect();
        this._overlayRect = this._pane.getBoundingClientRect();
        const originRect = this._originRect;
        const overlayRect = this._overlayRect;
        const viewportRect = this._viewportRect;
        // Positions where the overlay will fit with flexible dimensions.
        const flexibleFits = [];
        // Fallback if none of the preferred positions fit within the viewport.
        let fallback;
        // Go through each of the preferred positions looking for a good fit.
        // If a good fit is found, it will be applied immediately.
        for (let pos of this._preferredPositions) {
            // Get the exact (x, y) coordinate for the point-of-origin on the origin element.
            let originPoint = this._getOriginPoint(originRect, pos);
            // From that point-of-origin, get the exact (x, y) coordinate for the top-left corner of the
            // overlay in this position. We use the top-left corner for calculations and later translate
            // this into an appropriate (top, left, bottom, right) style.
            let overlayPoint = this._getOverlayPoint(originPoint, overlayRect, pos);
            // Calculate how well the overlay would fit into the viewport with this point.
            let overlayFit = this._getOverlayFit(overlayPoint, overlayRect, viewportRect, pos);
            // If the overlay, without any further work, fits into the viewport, use this position.
            if (overlayFit.isCompletelyWithinViewport) {
                this._isPushed = false;
                this._applyPosition(pos, originPoint);
                return;
            }
            // If the overlay has flexible dimensions, we can use this position
            // so long as there's enough space for the minimum dimensions.
            if (this._canFitWithFlexibleDimensions(overlayFit, overlayPoint, viewportRect)) {
                // Save positions where the overlay will fit with flexible dimensions. We will use these
                // if none of the positions fit *without* flexible dimensions.
                flexibleFits.push({
                    position: pos,
                    origin: originPoint,
                    overlayRect,
                    boundingBoxRect: this._calculateBoundingBoxRect(originPoint, pos)
                });
                continue;
            }
            // If the current preferred position does not fit on the screen, remember the position
            // if it has more visible area on-screen than we've seen and move onto the next preferred
            // position.
            if (!fallback || fallback.overlayFit.visibleArea < overlayFit.visibleArea) {
                fallback = { overlayFit, overlayPoint, originPoint, position: pos, overlayRect };
            }
        }
        // If there are any positions where the overlay would fit with flexible dimensions, choose the
        // one that has the greatest area available modified by the position's weight
        if (flexibleFits.length) {
            let bestFit = null;
            let bestScore = -1;
            for (const fit of flexibleFits) {
                const score = fit.boundingBoxRect.width * fit.boundingBoxRect.height * (fit.position.weight || 1);
                if (score > bestScore) {
                    bestScore = score;
                    bestFit = fit;
                }
            }
            this._isPushed = false;
            this._applyPosition(bestFit.position, bestFit.origin);
            return;
        }
        // When none of the preferred positions fit within the viewport, take the position
        // that went off-screen the least and attempt to push it on-screen.
        if (this._canPush) {
            // TODO(jelbourn): after pushing, the opening "direction" of the overlay might not make sense.
            this._isPushed = true;
            this._applyPosition(fallback.position, fallback.originPoint);
            return;
        }
        // All options for getting the overlay within the viewport have been exhausted, so go with the
        // position that went off-screen the least.
        this._applyPosition(fallback.position, fallback.originPoint);
    }
    detach() {
        this._clearPanelClasses();
        this._lastPosition = null;
        this._previousPushAmount = null;
        this._resizeSubscription.unsubscribe();
    }
    /** Cleanup after the element gets destroyed. */
    dispose() {
        if (this._isDisposed) {
            return;
        }
        // We can't use `_resetBoundingBoxStyles` here, because it resets
        // some properties to zero, rather than removing them.
        if (this._boundingBox) {
            extendStyles(this._boundingBox.style, {
                top: '',
                left: '',
                right: '',
                bottom: '',
                height: '',
                width: '',
                alignItems: '',
                justifyContent: '',
            });
        }
        if (this._pane) {
            this._resetOverlayElementStyles();
        }
        if (this._overlayRef) {
            this._overlayRef.hostElement.classList.remove(boundingBoxClass);
        }
        this.detach();
        this._positionChanges.complete();
        this._overlayRef = this._boundingBox = null;
        this._isDisposed = true;
    }
    /**
     * This re-aligns the overlay element with the trigger in its last calculated position,
     * even if a position higher in the "preferred positions" list would now fit. This
     * allows one to re-align the panel without changing the orientation of the panel.
     */
    reapplyLastPosition() {
        if (!this._isDisposed && (!this._platform || this._platform.isBrowser)) {
            this._originRect = this._getOriginRect();
            this._overlayRect = this._pane.getBoundingClientRect();
            this._viewportRect = this._getNarrowedViewportRect();
            const lastPosition = this._lastPosition || this._preferredPositions[0];
            const originPoint = this._getOriginPoint(this._originRect, lastPosition);
            this._applyPosition(lastPosition, originPoint);
        }
    }
    /**
     * Sets the list of Scrollable containers that host the origin element so that
     * on reposition we can evaluate if it or the overlay has been clipped or outside view. Every
     * Scrollable must be an ancestor element of the strategy's origin element.
     */
    withScrollableContainers(scrollables) {
        this._scrollables = scrollables;
        return this;
    }
    /**
     * Adds new preferred positions.
     * @param positions List of positions options for this overlay.
     */
    withPositions(positions) {
        this._preferredPositions = positions;
        // If the last calculated position object isn't part of the positions anymore, clear
        // it in order to avoid it being picked up if the consumer tries to re-apply.
        if (positions.indexOf(this._lastPosition) === -1) {
            this._lastPosition = null;
        }
        this._validatePositions();
        return this;
    }
    /**
     * Sets a minimum distance the overlay may be positioned to the edge of the viewport.
     * @param margin Required margin between the overlay and the viewport edge in pixels.
     */
    withViewportMargin(margin) {
        this._viewportMargin = margin;
        return this;
    }
    /** Sets whether the overlay's width and height can be constrained to fit within the viewport. */
    withFlexibleDimensions(flexibleDimensions = true) {
        this._hasFlexibleDimensions = flexibleDimensions;
        return this;
    }
    /** Sets whether the overlay can grow after the initial open via flexible width/height. */
    withGrowAfterOpen(growAfterOpen = true) {
        this._growAfterOpen = growAfterOpen;
        return this;
    }
    /** Sets whether the overlay can be pushed on-screen if none of the provided positions fit. */
    withPush(canPush = true) {
        this._canPush = canPush;
        return this;
    }
    /**
     * Sets whether the overlay's position should be locked in after it is positioned
     * initially. When an overlay is locked in, it won't attempt to reposition itself
     * when the position is re-applied (e.g. when the user scrolls away).
     * @param isLocked Whether the overlay should locked in.
     */
    withLockedPosition(isLocked = true) {
        this._positionLocked = isLocked;
        return this;
    }
    /**
     * Sets the origin, relative to which to position the overlay.
     * Using an element origin is useful for building components that need to be positioned
     * relatively to a trigger (e.g. dropdown menus or tooltips), whereas using a point can be
     * used for cases like contextual menus which open relative to the user's pointer.
     * @param origin Reference to the new origin.
     */
    setOrigin(origin) {
        this._origin = origin;
        return this;
    }
    /**
     * Sets the default offset for the overlay's connection point on the x-axis.
     * @param offset New offset in the X axis.
     */
    withDefaultOffsetX(offset) {
        this._offsetX = offset;
        return this;
    }
    /**
     * Sets the default offset for the overlay's connection point on the y-axis.
     * @param offset New offset in the Y axis.
     */
    withDefaultOffsetY(offset) {
        this._offsetY = offset;
        return this;
    }
    /**
     * Configures that the position strategy should set a `transform-origin` on some elements
     * inside the overlay, depending on the current position that is being applied. This is
     * useful for the cases where the origin of an animation can change depending on the
     * alignment of the overlay.
     * @param selector CSS selector that will be used to find the target
     *    elements onto which to set the transform origin.
     */
    withTransformOriginOn(selector) {
        this._transformOriginSelector = selector;
        return this;
    }
    /**
     * Gets the (x, y) coordinate of a connection point on the origin based on a relative position.
     */
    _getOriginPoint(originRect, pos) {
        let x;
        if (pos.originX == 'center') {
            // Note: when centering we should always use the `left`
            // offset, otherwise the position will be wrong in RTL.
            x = originRect.left + (originRect.width / 2);
        }
        else {
            const startX = this._isRtl() ? originRect.right : originRect.left;
            const endX = this._isRtl() ? originRect.left : originRect.right;
            x = pos.originX == 'start' ? startX : endX;
        }
        let y;
        if (pos.originY == 'center') {
            y = originRect.top + (originRect.height / 2);
        }
        else {
            y = pos.originY == 'top' ? originRect.top : originRect.bottom;
        }
        return { x, y };
    }
    /**
     * Gets the (x, y) coordinate of the top-left corner of the overlay given a given position and
     * origin point to which the overlay should be connected.
     */
    _getOverlayPoint(originPoint, overlayRect, pos) {
        // Calculate the (overlayStartX, overlayStartY), the start of the
        // potential overlay position relative to the origin point.
        let overlayStartX;
        if (pos.overlayX == 'center') {
            overlayStartX = -overlayRect.width / 2;
        }
        else if (pos.overlayX === 'start') {
            overlayStartX = this._isRtl() ? -overlayRect.width : 0;
        }
        else {
            overlayStartX = this._isRtl() ? 0 : -overlayRect.width;
        }
        let overlayStartY;
        if (pos.overlayY == 'center') {
            overlayStartY = -overlayRect.height / 2;
        }
        else {
            overlayStartY = pos.overlayY == 'top' ? 0 : -overlayRect.height;
        }
        // The (x, y) coordinates of the overlay.
        return {
            x: originPoint.x + overlayStartX,
            y: originPoint.y + overlayStartY,
        };
    }
    /** Gets how well an overlay at the given point will fit within the viewport. */
    _getOverlayFit(point, rawOverlayRect, viewport, position) {
        // Round the overlay rect when comparing against the
        // viewport, because the viewport is always rounded.
        const overlay = getRoundedBoundingClientRect(rawOverlayRect);
        let { x, y } = point;
        let offsetX = this._getOffset(position, 'x');
        let offsetY = this._getOffset(position, 'y');
        // Account for the offsets since they could push the overlay out of the viewport.
        if (offsetX) {
            x += offsetX;
        }
        if (offsetY) {
            y += offsetY;
        }
        // How much the overlay would overflow at this position, on each side.
        let leftOverflow = 0 - x;
        let rightOverflow = (x + overlay.width) - viewport.width;
        let topOverflow = 0 - y;
        let bottomOverflow = (y + overlay.height) - viewport.height;
        // Visible parts of the element on each axis.
        let visibleWidth = this._subtractOverflows(overlay.width, leftOverflow, rightOverflow);
        let visibleHeight = this._subtractOverflows(overlay.height, topOverflow, bottomOverflow);
        let visibleArea = visibleWidth * visibleHeight;
        return {
            visibleArea,
            isCompletelyWithinViewport: (overlay.width * overlay.height) === visibleArea,
            fitsInViewportVertically: visibleHeight === overlay.height,
            fitsInViewportHorizontally: visibleWidth == overlay.width,
        };
    }
    /**
     * Whether the overlay can fit within the viewport when it may resize either its width or height.
     * @param fit How well the overlay fits in the viewport at some position.
     * @param point The (x, y) coordinates of the overlat at some position.
     * @param viewport The geometry of the viewport.
     */
    _canFitWithFlexibleDimensions(fit, point, viewport) {
        if (this._hasFlexibleDimensions) {
            const availableHeight = viewport.bottom - point.y;
            const availableWidth = viewport.right - point.x;
            const minHeight = getPixelValue(this._overlayRef.getConfig().minHeight);
            const minWidth = getPixelValue(this._overlayRef.getConfig().minWidth);
            const verticalFit = fit.fitsInViewportVertically ||
                (minHeight != null && minHeight <= availableHeight);
            const horizontalFit = fit.fitsInViewportHorizontally ||
                (minWidth != null && minWidth <= availableWidth);
            return verticalFit && horizontalFit;
        }
        return false;
    }
    /**
     * Gets the point at which the overlay can be "pushed" on-screen. If the overlay is larger than
     * the viewport, the top-left corner will be pushed on-screen (with overflow occuring on the
     * right and bottom).
     *
     * @param start Starting point from which the overlay is pushed.
     * @param overlay Dimensions of the overlay.
     * @param scrollPosition Current viewport scroll position.
     * @returns The point at which to position the overlay after pushing. This is effectively a new
     *     originPoint.
     */
    _pushOverlayOnScreen(start, rawOverlayRect, scrollPosition) {
        // If the position is locked and we've pushed the overlay already, reuse the previous push
        // amount, rather than pushing it again. If we were to continue pushing, the element would
        // remain in the viewport, which goes against the expectations when position locking is enabled.
        if (this._previousPushAmount && this._positionLocked) {
            return {
                x: start.x + this._previousPushAmount.x,
                y: start.y + this._previousPushAmount.y
            };
        }
        // Round the overlay rect when comparing against the
        // viewport, because the viewport is always rounded.
        const overlay = getRoundedBoundingClientRect(rawOverlayRect);
        const viewport = this._viewportRect;
        // Determine how much the overlay goes outside the viewport on each
        // side, which we'll use to decide which direction to push it.
        const overflowRight = Math.max(start.x + overlay.width - viewport.width, 0);
        const overflowBottom = Math.max(start.y + overlay.height - viewport.height, 0);
        const overflowTop = Math.max(viewport.top - scrollPosition.top - start.y, 0);
        const overflowLeft = Math.max(viewport.left - scrollPosition.left - start.x, 0);
        // Amount by which to push the overlay in each axis such that it remains on-screen.
        let pushX = 0;
        let pushY = 0;
        // If the overlay fits completely within the bounds of the viewport, push it from whichever
        // direction is goes off-screen. Otherwise, push the top-left corner such that its in the
        // viewport and allow for the trailing end of the overlay to go out of bounds.
        if (overlay.width <= viewport.width) {
            pushX = overflowLeft || -overflowRight;
        }
        else {
            pushX = start.x < this._viewportMargin ? (viewport.left - scrollPosition.left) - start.x : 0;
        }
        if (overlay.height <= viewport.height) {
            pushY = overflowTop || -overflowBottom;
        }
        else {
            pushY = start.y < this._viewportMargin ? (viewport.top - scrollPosition.top) - start.y : 0;
        }
        this._previousPushAmount = { x: pushX, y: pushY };
        return {
            x: start.x + pushX,
            y: start.y + pushY,
        };
    }
    /**
     * Applies a computed position to the overlay and emits a position change.
     * @param position The position preference
     * @param originPoint The point on the origin element where the overlay is connected.
     */
    _applyPosition(position, originPoint) {
        this._setTransformOrigin(position);
        this._setOverlayElementStyles(originPoint, position);
        this._setBoundingBoxStyles(originPoint, position);
        if (position.panelClass) {
            this._addPanelClasses(position.panelClass);
        }
        // Save the last connected position in case the position needs to be re-calculated.
        this._lastPosition = position;
        // Notify that the position has been changed along with its change properties.
        // We only emit if we've got any subscriptions, because the scroll visibility
        // calculcations can be somewhat expensive.
        if (this._positionChanges.observers.length) {
            const scrollableViewProperties = this._getScrollVisibility();
            const changeEvent = new ConnectedOverlayPositionChange(position, scrollableViewProperties);
            this._positionChanges.next(changeEvent);
        }
        this._isInitialRender = false;
    }
    /** Sets the transform origin based on the configured selector and the passed-in position.  */
    _setTransformOrigin(position) {
        if (!this._transformOriginSelector) {
            return;
        }
        const elements = this._boundingBox.querySelectorAll(this._transformOriginSelector);
        let xOrigin;
        let yOrigin = position.overlayY;
        if (position.overlayX === 'center') {
            xOrigin = 'center';
        }
        else if (this._isRtl()) {
            xOrigin = position.overlayX === 'start' ? 'right' : 'left';
        }
        else {
            xOrigin = position.overlayX === 'start' ? 'left' : 'right';
        }
        for (let i = 0; i < elements.length; i++) {
            elements[i].style.transformOrigin = `${xOrigin} ${yOrigin}`;
        }
    }
    /**
     * Gets the position and size of the overlay's sizing container.
     *
     * This method does no measuring and applies no styles so that we can cheaply compute the
     * bounds for all positions and choose the best fit based on these results.
     */
    _calculateBoundingBoxRect(origin, position) {
        const viewport = this._viewportRect;
        const isRtl = this._isRtl();
        let height, top, bottom;
        if (position.overlayY === 'top') {
            // Overlay is opening "downward" and thus is bound by the bottom viewport edge.
            top = origin.y;
            height = viewport.height - top + this._viewportMargin;
        }
        else if (position.overlayY === 'bottom') {
            // Overlay is opening "upward" and thus is bound by the top viewport edge. We need to add
            // the viewport margin back in, because the viewport rect is narrowed down to remove the
            // margin, whereas the `origin` position is calculated based on its `ClientRect`.
            bottom = viewport.height - origin.y + this._viewportMargin * 2;
            height = viewport.height - bottom + this._viewportMargin;
        }
        else {
            // If neither top nor bottom, it means that the overlay is vertically centered on the
            // origin point. Note that we want the position relative to the viewport, rather than
            // the page, which is why we don't use something like `viewport.bottom - origin.y` and
            // `origin.y - viewport.top`.
            const smallestDistanceToViewportEdge = Math.min(viewport.bottom - origin.y + viewport.top, origin.y);
            const previousHeight = this._lastBoundingBoxSize.height;
            height = smallestDistanceToViewportEdge * 2;
            top = origin.y - smallestDistanceToViewportEdge;
            if (height > previousHeight && !this._isInitialRender && !this._growAfterOpen) {
                top = origin.y - (previousHeight / 2);
            }
        }
        // The overlay is opening 'right-ward' (the content flows to the right).
        const isBoundedByRightViewportEdge = (position.overlayX === 'start' && !isRtl) ||
            (position.overlayX === 'end' && isRtl);
        // The overlay is opening 'left-ward' (the content flows to the left).
        const isBoundedByLeftViewportEdge = (position.overlayX === 'end' && !isRtl) ||
            (position.overlayX === 'start' && isRtl);
        let width, left, right;
        if (isBoundedByLeftViewportEdge) {
            right = viewport.width - origin.x + this._viewportMargin;
            width = origin.x - this._viewportMargin;
        }
        else if (isBoundedByRightViewportEdge) {
            left = origin.x;
            width = viewport.right - origin.x;
        }
        else {
            // If neither start nor end, it means that the overlay is horizontally centered on the
            // origin point. Note that we want the position relative to the viewport, rather than
            // the page, which is why we don't use something like `viewport.right - origin.x` and
            // `origin.x - viewport.left`.
            const smallestDistanceToViewportEdge = Math.min(viewport.right - origin.x + viewport.left, origin.x);
            const previousWidth = this._lastBoundingBoxSize.width;
            width = smallestDistanceToViewportEdge * 2;
            left = origin.x - smallestDistanceToViewportEdge;
            if (width > previousWidth && !this._isInitialRender && !this._growAfterOpen) {
                left = origin.x - (previousWidth / 2);
            }
        }
        return { top: top, left: left, bottom: bottom, right: right, width, height };
    }
    /**
     * Sets the position and size of the overlay's sizing wrapper. The wrapper is positioned on the
     * origin's connection point and stetches to the bounds of the viewport.
     *
     * @param origin The point on the origin element where the overlay is connected.
     * @param position The position preference
     */
    _setBoundingBoxStyles(origin, position) {
        const boundingBoxRect = this._calculateBoundingBoxRect(origin, position);
        // It's weird if the overlay *grows* while scrolling, so we take the last size into account
        // when applying a new size.
        if (!this._isInitialRender && !this._growAfterOpen) {
            boundingBoxRect.height = Math.min(boundingBoxRect.height, this._lastBoundingBoxSize.height);
            boundingBoxRect.width = Math.min(boundingBoxRect.width, this._lastBoundingBoxSize.width);
        }
        const styles = {};
        if (this._hasExactPosition()) {
            styles.top = styles.left = '0';
            styles.bottom = styles.right = styles.maxHeight = styles.maxWidth = '';
            styles.width = styles.height = '100%';
        }
        else {
            const maxHeight = this._overlayRef.getConfig().maxHeight;
            const maxWidth = this._overlayRef.getConfig().maxWidth;
            styles.height = coerceCssPixelValue(boundingBoxRect.height);
            styles.top = coerceCssPixelValue(boundingBoxRect.top);
            styles.bottom = coerceCssPixelValue(boundingBoxRect.bottom);
            styles.width = coerceCssPixelValue(boundingBoxRect.width);
            styles.left = coerceCssPixelValue(boundingBoxRect.left);
            styles.right = coerceCssPixelValue(boundingBoxRect.right);
            // Push the pane content towards the proper direction.
            if (position.overlayX === 'center') {
                styles.alignItems = 'center';
            }
            else {
                styles.alignItems = position.overlayX === 'end' ? 'flex-end' : 'flex-start';
            }
            if (position.overlayY === 'center') {
                styles.justifyContent = 'center';
            }
            else {
                styles.justifyContent = position.overlayY === 'bottom' ? 'flex-end' : 'flex-start';
            }
            if (maxHeight) {
                styles.maxHeight = coerceCssPixelValue(maxHeight);
            }
            if (maxWidth) {
                styles.maxWidth = coerceCssPixelValue(maxWidth);
            }
        }
        this._lastBoundingBoxSize = boundingBoxRect;
        extendStyles(this._boundingBox.style, styles);
    }
    /** Resets the styles for the bounding box so that a new positioning can be computed. */
    _resetBoundingBoxStyles() {
        extendStyles(this._boundingBox.style, {
            top: '0',
            left: '0',
            right: '0',
            bottom: '0',
            height: '',
            width: '',
            alignItems: '',
            justifyContent: '',
        });
    }
    /** Resets the styles for the overlay pane so that a new positioning can be computed. */
    _resetOverlayElementStyles() {
        extendStyles(this._pane.style, {
            top: '',
            left: '',
            bottom: '',
            right: '',
            position: '',
            transform: '',
        });
    }
    /** Sets positioning styles to the overlay element. */
    _setOverlayElementStyles(originPoint, position) {
        const styles = {};
        const hasExactPosition = this._hasExactPosition();
        const hasFlexibleDimensions = this._hasFlexibleDimensions;
        const config = this._overlayRef.getConfig();
        if (hasExactPosition) {
            const scrollPosition = this._viewportRuler.getViewportScrollPosition();
            extendStyles(styles, this._getExactOverlayY(position, originPoint, scrollPosition));
            extendStyles(styles, this._getExactOverlayX(position, originPoint, scrollPosition));
        }
        else {
            styles.position = 'static';
        }
        // Use a transform to apply the offsets. We do this because the `center` positions rely on
        // being in the normal flex flow and setting a `top` / `left` at all will completely throw
        // off the position. We also can't use margins, because they won't have an effect in some
        // cases where the element doesn't have anything to "push off of". Finally, this works
        // better both with flexible and non-flexible positioning.
        let transformString = '';
        let offsetX = this._getOffset(position, 'x');
        let offsetY = this._getOffset(position, 'y');
        if (offsetX) {
            transformString += `translateX(${offsetX}px) `;
        }
        if (offsetY) {
            transformString += `translateY(${offsetY}px)`;
        }
        styles.transform = transformString.trim();
        // If a maxWidth or maxHeight is specified on the overlay, we remove them. We do this because
        // we need these values to both be set to "100%" for the automatic flexible sizing to work.
        // The maxHeight and maxWidth are set on the boundingBox in order to enforce the constraint.
        // Note that this doesn't apply when we have an exact position, in which case we do want to
        // apply them because they'll be cleared from the bounding box.
        if (config.maxHeight) {
            if (hasExactPosition) {
                styles.maxHeight = coerceCssPixelValue(config.maxHeight);
            }
            else if (hasFlexibleDimensions) {
                styles.maxHeight = '';
            }
        }
        if (config.maxWidth) {
            if (hasExactPosition) {
                styles.maxWidth = coerceCssPixelValue(config.maxWidth);
            }
            else if (hasFlexibleDimensions) {
                styles.maxWidth = '';
            }
        }
        extendStyles(this._pane.style, styles);
    }
    /** Gets the exact top/bottom for the overlay when not using flexible sizing or when pushing. */
    _getExactOverlayY(position, originPoint, scrollPosition) {
        // Reset any existing styles. This is necessary in case the
        // preferred position has changed since the last `apply`.
        let styles = { top: '', bottom: '' };
        let overlayPoint = this._getOverlayPoint(originPoint, this._overlayRect, position);
        if (this._isPushed) {
            overlayPoint = this._pushOverlayOnScreen(overlayPoint, this._overlayRect, scrollPosition);
        }
        let virtualKeyboardOffset = this._overlayContainer.getContainerElement().getBoundingClientRect().top;
        // Normally this would be zero, however when the overlay is attached to an input (e.g. in an
        // autocomplete), mobile browsers will shift everything in order to put the input in the middle
        // of the screen and to make space for the virtual keyboard. We need to account for this offset,
        // otherwise our positioning will be thrown off.
        overlayPoint.y -= virtualKeyboardOffset;
        // We want to set either `top` or `bottom` based on whether the overlay wants to appear
        // above or below the origin and the direction in which the element will expand.
        if (position.overlayY === 'bottom') {
            // When using `bottom`, we adjust the y position such that it is the distance
            // from the bottom of the viewport rather than the top.
            const documentHeight = this._document.documentElement.clientHeight;
            styles.bottom = `${documentHeight - (overlayPoint.y + this._overlayRect.height)}px`;
        }
        else {
            styles.top = coerceCssPixelValue(overlayPoint.y);
        }
        return styles;
    }
    /** Gets the exact left/right for the overlay when not using flexible sizing or when pushing. */
    _getExactOverlayX(position, originPoint, scrollPosition) {
        // Reset any existing styles. This is necessary in case the preferred position has
        // changed since the last `apply`.
        let styles = { left: '', right: '' };
        let overlayPoint = this._getOverlayPoint(originPoint, this._overlayRect, position);
        if (this._isPushed) {
            overlayPoint = this._pushOverlayOnScreen(overlayPoint, this._overlayRect, scrollPosition);
        }
        // We want to set either `left` or `right` based on whether the overlay wants to appear "before"
        // or "after" the origin, which determines the direction in which the element will expand.
        // For the horizontal axis, the meaning of "before" and "after" change based on whether the
        // page is in RTL or LTR.
        let horizontalStyleProperty;
        if (this._isRtl()) {
            horizontalStyleProperty = position.overlayX === 'end' ? 'left' : 'right';
        }
        else {
            horizontalStyleProperty = position.overlayX === 'end' ? 'right' : 'left';
        }
        // When we're setting `right`, we adjust the x position such that it is the distance
        // from the right edge of the viewport rather than the left edge.
        if (horizontalStyleProperty === 'right') {
            const documentWidth = this._document.documentElement.clientWidth;
            styles.right = `${documentWidth - (overlayPoint.x + this._overlayRect.width)}px`;
        }
        else {
            styles.left = coerceCssPixelValue(overlayPoint.x);
        }
        return styles;
    }
    /**
     * Gets the view properties of the trigger and overlay, including whether they are clipped
     * or completely outside the view of any of the strategy's scrollables.
     */
    _getScrollVisibility() {
        // Note: needs fresh rects since the position could've changed.
        const originBounds = this._getOriginRect();
        const overlayBounds = this._pane.getBoundingClientRect();
        // TODO(jelbourn): instead of needing all of the client rects for these scrolling containers
        // every time, we should be able to use the scrollTop of the containers if the size of those
        // containers hasn't changed.
        const scrollContainerBounds = this._scrollables.map(scrollable => {
            return scrollable.getElementRef().nativeElement.getBoundingClientRect();
        });
        return {
            isOriginClipped: isElementClippedByScrolling(originBounds, scrollContainerBounds),
            isOriginOutsideView: isElementScrolledOutsideView(originBounds, scrollContainerBounds),
            isOverlayClipped: isElementClippedByScrolling(overlayBounds, scrollContainerBounds),
            isOverlayOutsideView: isElementScrolledOutsideView(overlayBounds, scrollContainerBounds),
        };
    }
    /** Subtracts the amount that an element is overflowing on an axis from its length. */
    _subtractOverflows(length, ...overflows) {
        return overflows.reduce((currentValue, currentOverflow) => {
            return currentValue - Math.max(currentOverflow, 0);
        }, length);
    }
    /** Narrows the given viewport rect by the current _viewportMargin. */
    _getNarrowedViewportRect() {
        // We recalculate the viewport rect here ourselves, rather than using the ViewportRuler,
        // because we want to use the `clientWidth` and `clientHeight` as the base. The difference
        // being that the client properties don't include the scrollbar, as opposed to `innerWidth`
        // and `innerHeight` that do. This is necessary, because the overlay container uses
        // 100% `width` and `height` which don't include the scrollbar either.
        const width = this._document.documentElement.clientWidth;
        const height = this._document.documentElement.clientHeight;
        const scrollPosition = this._viewportRuler.getViewportScrollPosition();
        return {
            top: scrollPosition.top + this._viewportMargin,
            left: scrollPosition.left + this._viewportMargin,
            right: scrollPosition.left + width - this._viewportMargin,
            bottom: scrollPosition.top + height - this._viewportMargin,
            width: width - (2 * this._viewportMargin),
            height: height - (2 * this._viewportMargin),
        };
    }
    /** Whether the we're dealing with an RTL context */
    _isRtl() {
        return this._overlayRef.getDirection() === 'rtl';
    }
    /** Determines whether the overlay uses exact or flexible positioning. */
    _hasExactPosition() {
        return !this._hasFlexibleDimensions || this._isPushed;
    }
    /** Retrieves the offset of a position along the x or y axis. */
    _getOffset(position, axis) {
        if (axis === 'x') {
            // We don't do something like `position['offset' + axis]` in
            // order to avoid breking minifiers that rename properties.
            return position.offsetX == null ? this._offsetX : position.offsetX;
        }
        return position.offsetY == null ? this._offsetY : position.offsetY;
    }
    /** Validates that the current position match the expected values. */
    _validatePositions() {
        if (typeof ngDevMode === 'undefined' || ngDevMode) {
            if (!this._preferredPositions.length) {
                throw Error('FlexibleConnectedPositionStrategy: At least one position is required.');
            }
            // TODO(crisbeto): remove these once Angular's template type
            // checking is advanced enough to catch these cases.
            this._preferredPositions.forEach(pair => {
                validateHorizontalPosition('originX', pair.originX);
                validateVerticalPosition('originY', pair.originY);
                validateHorizontalPosition('overlayX', pair.overlayX);
                validateVerticalPosition('overlayY', pair.overlayY);
            });
        }
    }
    /** Adds a single CSS class or an array of classes on the overlay panel. */
    _addPanelClasses(cssClasses) {
        if (this._pane) {
            coerceArray(cssClasses).forEach(cssClass => {
                if (cssClass !== '' && this._appliedPanelClasses.indexOf(cssClass) === -1) {
                    this._appliedPanelClasses.push(cssClass);
                    this._pane.classList.add(cssClass);
                }
            });
        }
    }
    /** Clears the classes that the position strategy has applied from the overlay panel. */
    _clearPanelClasses() {
        if (this._pane) {
            this._appliedPanelClasses.forEach(cssClass => {
                this._pane.classList.remove(cssClass);
            });
            this._appliedPanelClasses = [];
        }
    }
    /** Returns the ClientRect of the current origin. */
    _getOriginRect() {
        const origin = this._origin;
        if (origin instanceof ElementRef) {
            return origin.nativeElement.getBoundingClientRect();
        }
        // Check for Element so SVG elements are also supported.
        if (origin instanceof Element) {
            return origin.getBoundingClientRect();
        }
        const width = origin.width || 0;
        const height = origin.height || 0;
        // If the origin is a point, return a client rect as if it was a 0x0 element at the point.
        return {
            top: origin.y,
            bottom: origin.y + height,
            left: origin.x,
            right: origin.x + width,
            height,
            width
        };
    }
}
/** Shallow-extends a stylesheet object with another stylesheet object. */
function extendStyles(destination, source) {
    for (let key in source) {
        if (source.hasOwnProperty(key)) {
            destination[key] = source[key];
        }
    }
    return destination;
}
/**
 * Extracts the pixel value as a number from a value, if it's a number
 * or a CSS pixel string (e.g. `1337px`). Otherwise returns null.
 */
function getPixelValue(input) {
    if (typeof input !== 'number' && input != null) {
        const [value, units] = input.split(cssUnitPattern);
        return (!units || units === 'px') ? parseFloat(value) : null;
    }
    return input || null;
}
/**
 * Gets a version of an element's bounding `ClientRect` where all the values are rounded down to
 * the nearest pixel. This allows us to account for the cases where there may be sub-pixel
 * deviations in the `ClientRect` returned by the browser (e.g. when zoomed in with a percentage
 * size, see #21350).
 */
function getRoundedBoundingClientRect(clientRect) {
    return {
        top: Math.floor(clientRect.top),
        right: Math.floor(clientRect.right),
        bottom: Math.floor(clientRect.bottom),
        left: Math.floor(clientRect.left),
        width: Math.floor(clientRect.width),
        height: Math.floor(clientRect.height)
    };
}
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* @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"]}