source: trip-planner-front/node_modules/@angular/material/fesm2015/menu.js@ 6a3a178

import { FocusMonitor, FocusKeyManager, isFakeTouchstartFromScreenReader, isFakeMousedownFromScreenReader } from '@angular/cdk/a11y';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { UP_ARROW, DOWN_ARROW, RIGHT_ARROW, LEFT_ARROW, ESCAPE, hasModifierKey, ENTER, SPACE } from '@angular/cdk/keycodes';
import { InjectionToken, Directive, TemplateRef, ComponentFactoryResolver, ApplicationRef, Injector, ViewContainerRef, Inject, ChangeDetectorRef, Component, ChangeDetectionStrategy, ViewEncapsulation, ElementRef, Optional, Input, HostListener, QueryList, EventEmitter, NgZone, ContentChildren, ViewChild, ContentChild, Output, Self, HostBinding, NgModule } from '@angular/core';
import { Subject, Subscription, merge, of, asapScheduler } from 'rxjs';
import { startWith, switchMap, take, filter, takeUntil, delay } from 'rxjs/operators';
import { trigger, state, style, transition, animate } from '@angular/animations';
import { TemplatePortal, DomPortalOutlet } from '@angular/cdk/portal';
import { DOCUMENT, CommonModule } from '@angular/common';
import { mixinDisableRipple, mixinDisabled, MatCommonModule, MatRippleModule } from '@angular/material/core';
import { Directionality } from '@angular/cdk/bidi';
import { Overlay, OverlayConfig, OverlayModule } from '@angular/cdk/overlay';
import { normalizePassiveListenerOptions } from '@angular/cdk/platform';
import { CdkScrollableModule } from '@angular/cdk/scrolling';

/**
 * @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
 */
/**
 * Animations used by the mat-menu component.
 * Animation duration and timing values are based on:
 * https://material.io/guidelines/components/menus.html#menus-usage
 * @docs-private
 */
const matMenuAnimations = {
    /**
     * This animation controls the menu panel's entry and exit from the page.
     *
     * When the menu panel is added to the DOM, it scales in and fades in its border.
     *
     * When the menu panel is removed from the DOM, it simply fades out after a brief
     * delay to display the ripple.
     */
    transformMenu: trigger('transformMenu', [
        state('void', style({
            opacity: 0,
            transform: 'scale(0.8)'
        })),
        transition('void => enter', animate('120ms cubic-bezier(0, 0, 0.2, 1)', style({
            opacity: 1,
            transform: 'scale(1)'
        }))),
        transition('* => void', animate('100ms 25ms linear', style({ opacity: 0 })))
    ]),
    /**
     * This animation fades in the background color and content of the menu panel
     * after its containing element is scaled in.
     */
    fadeInItems: trigger('fadeInItems', [
        // TODO(crisbeto): this is inside the `transformMenu`
        // now. Remove next time we do breaking changes.
        state('showing', style({ opacity: 1 })),
        transition('void => *', [
            style({ opacity: 0 }),
            animate('400ms 100ms cubic-bezier(0.55, 0, 0.55, 0.2)')
        ])
    ])
};
/**
 * @deprecated
 * @breaking-change 8.0.0
 * @docs-private
 */
const fadeInItems = matMenuAnimations.fadeInItems;
/**
 * @deprecated
 * @breaking-change 8.0.0
 * @docs-private
 */
const transformMenu = matMenuAnimations.transformMenu;

/**
 * @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
 */
/**
 * Injection token that can be used to reference instances of `MatMenuContent`. It serves
 * as alternative token to the actual `MatMenuContent` class which could cause unnecessary
 * retention of the class and its directive metadata.
 */
const MAT_MENU_CONTENT = new InjectionToken('MatMenuContent');
class _MatMenuContentBase {
    constructor(_template, _componentFactoryResolver, _appRef, _injector, _viewContainerRef, _document, _changeDetectorRef) {
        this._template = _template;
        this._componentFactoryResolver = _componentFactoryResolver;
        this._appRef = _appRef;
        this._injector = _injector;
        this._viewContainerRef = _viewContainerRef;
        this._document = _document;
        this._changeDetectorRef = _changeDetectorRef;
        /** Emits when the menu content has been attached. */
        this._attached = new Subject();
    }
    /**
     * Attaches the content with a particular context.
     * @docs-private
     */
    attach(context = {}) {
        if (!this._portal) {
            this._portal = new TemplatePortal(this._template, this._viewContainerRef);
        }
        this.detach();
        if (!this._outlet) {
            this._outlet = new DomPortalOutlet(this._document.createElement('div'), this._componentFactoryResolver, this._appRef, this._injector);
        }
        const element = this._template.elementRef.nativeElement;
        // Because we support opening the same menu from different triggers (which in turn have their
        // own `OverlayRef` panel), we have to re-insert the host element every time, otherwise we
        // risk it staying attached to a pane that's no longer in the DOM.
        element.parentNode.insertBefore(this._outlet.outletElement, element);
        // When `MatMenuContent` is used in an `OnPush` component, the insertion of the menu
        // content via `createEmbeddedView` does not cause the content to be seen as "dirty"
        // by Angular. This causes the `@ContentChildren` for menu items within the menu to
        // not be updated by Angular. By explicitly marking for check here, we tell Angular that
        // it needs to check for new menu items and update the `@ContentChild` in `MatMenu`.
        // @breaking-change 9.0.0 Make change detector ref required
        if (this._changeDetectorRef) {
            this._changeDetectorRef.markForCheck();
        }
        this._portal.attach(this._outlet, context);
        this._attached.next();
    }
    /**
     * Detaches the content.
     * @docs-private
     */
    detach() {
        if (this._portal.isAttached) {
            this._portal.detach();
        }
    }
    ngOnDestroy() {
        if (this._outlet) {
            this._outlet.dispose();
        }
    }
}
_MatMenuContentBase.decorators = [
    { type: Directive }
];
_MatMenuContentBase.ctorParameters = () => [
    { type: TemplateRef },
    { type: ComponentFactoryResolver },
    { type: ApplicationRef },
    { type: Injector },
    { type: ViewContainerRef },
    { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
    { type: ChangeDetectorRef }
];
/**
 * Menu content that will be rendered lazily once the menu is opened.
 */
class MatMenuContent extends _MatMenuContentBase {
}
MatMenuContent.decorators = [
    { type: Directive, args: [{
                selector: 'ng-template[matMenuContent]',
                providers: [{ provide: MAT_MENU_CONTENT, useExisting: MatMenuContent }],
            },] }
];

/**
 * @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
 */
/**
 * Throws an exception for the case when menu trigger doesn't have a valid mat-menu instance
 * @docs-private
 */
function throwMatMenuMissingError() {
    throw Error(`matMenuTriggerFor: must pass in an mat-menu instance.

    Example:
      <mat-menu #menu="matMenu"></mat-menu>
      <button [matMenuTriggerFor]="menu"></button>`);
}
/**
 * Throws an exception for the case when menu's x-position value isn't valid.
 * In other words, it doesn't match 'before' or 'after'.
 * @docs-private
 */
function throwMatMenuInvalidPositionX() {
    throw Error(`xPosition value must be either 'before' or after'.
      Example: <mat-menu xPosition="before" #menu="matMenu"></mat-menu>`);
}
/**
 * Throws an exception for the case when menu's y-position value isn't valid.
 * In other words, it doesn't match 'above' or 'below'.
 * @docs-private
 */
function throwMatMenuInvalidPositionY() {
    throw Error(`yPosition value must be either 'above' or below'.
      Example: <mat-menu yPosition="above" #menu="matMenu"></mat-menu>`);
}
/**
 * Throws an exception for the case when a menu is assigned
 * to a trigger that is placed inside the same menu.
 * @docs-private
 */
function throwMatMenuRecursiveError() {
    throw Error(`matMenuTriggerFor: menu cannot contain its own trigger. Assign a menu that is ` +
        `not a parent of the trigger or move the trigger outside of the menu.`);
}

/**
 * @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
 */
/**
 * Injection token used to provide the parent menu to menu-specific components.
 * @docs-private
 */
const MAT_MENU_PANEL = new InjectionToken('MAT_MENU_PANEL');

/**
 * @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
 */
// Boilerplate for applying mixins to MatMenuItem.
/** @docs-private */
const _MatMenuItemBase = mixinDisableRipple(mixinDisabled(class {
}));
/**
 * Single item inside of a `mat-menu`. Provides the menu item styling and accessibility treatment.
 */
class MatMenuItem extends _MatMenuItemBase {
    constructor(_elementRef, 
    /**
     * @deprecated `_document` parameter is no longer being used and will be removed.
     * @breaking-change 12.0.0
     */
    _document, _focusMonitor, _parentMenu, 
    /**
     * @deprecated `_changeDetectorRef` to become a required parameter.
     * @breaking-change 14.0.0
     */
    _changeDetectorRef) {
        // @breaking-change 8.0.0 make `_focusMonitor` and `document` required params.
        super();
        this._elementRef = _elementRef;
        this._focusMonitor = _focusMonitor;
        this._parentMenu = _parentMenu;
        this._changeDetectorRef = _changeDetectorRef;
        /** ARIA role for the menu item. */
        this.role = 'menuitem';
        /** Stream that emits when the menu item is hovered. */
        this._hovered = new Subject();
        /** Stream that emits when the menu item is focused. */
        this._focused = new Subject();
        /** Whether the menu item is highlighted. */
        this._highlighted = false;
        /** Whether the menu item acts as a trigger for a sub-menu. */
        this._triggersSubmenu = false;
        if (_parentMenu && _parentMenu.addItem) {
            _parentMenu.addItem(this);
        }
    }
    /** Focuses the menu item. */
    focus(origin, options) {
        if (this._focusMonitor && origin) {
            this._focusMonitor.focusVia(this._getHostElement(), origin, options);
        }
        else {
            this._getHostElement().focus(options);
        }
        this._focused.next(this);
    }
    ngAfterViewInit() {
        if (this._focusMonitor) {
            // Start monitoring the element so it gets the appropriate focused classes. We want
            // to show the focus style for menu items only when the focus was not caused by a
            // mouse or touch interaction.
            this._focusMonitor.monitor(this._elementRef, false);
        }
    }
    ngOnDestroy() {
        if (this._focusMonitor) {
            this._focusMonitor.stopMonitoring(this._elementRef);
        }
        if (this._parentMenu && this._parentMenu.removeItem) {
            this._parentMenu.removeItem(this);
        }
        this._hovered.complete();
        this._focused.complete();
    }
    /** Used to set the `tabindex`. */
    _getTabIndex() {
        return this.disabled ? '-1' : '0';
    }
    /** Returns the host DOM element. */
    _getHostElement() {
        return this._elementRef.nativeElement;
    }
    /** Prevents the default element actions if it is disabled. */
    // We have to use a `HostListener` here in order to support both Ivy and ViewEngine.
    // In Ivy the `host` bindings will be merged when this class is extended, whereas in
    // ViewEngine they're overwritten.
    // TODO(crisbeto): we move this back into `host` once Ivy is turned on by default.
    // tslint:disable-next-line:no-host-decorator-in-concrete
    _checkDisabled(event) {
        if (this.disabled) {
            event.preventDefault();
            event.stopPropagation();
        }
    }
    /** Emits to the hover stream. */
    // We have to use a `HostListener` here in order to support both Ivy and ViewEngine.
    // In Ivy the `host` bindings will be merged when this class is extended, whereas in
    // ViewEngine they're overwritten.
    // TODO(crisbeto): we move this back into `host` once Ivy is turned on by default.
    // tslint:disable-next-line:no-host-decorator-in-concrete
    _handleMouseEnter() {
        this._hovered.next(this);
    }
    /** Gets the label to be used when determining whether the option should be focused. */
    getLabel() {
        var _a, _b;
        const clone = this._elementRef.nativeElement.cloneNode(true);
        const icons = clone.querySelectorAll('mat-icon, .material-icons');
        // Strip away icons so they don't show up in the text.
        for (let i = 0; i < icons.length; i++) {
            const icon = icons[i];
            (_a = icon.parentNode) === null || _a === void 0 ? void 0 : _a.removeChild(icon);
        }
        return ((_b = clone.textContent) === null || _b === void 0 ? void 0 : _b.trim()) || '';
    }
    _setHighlighted(isHighlighted) {
        var _a;
        // We need to mark this for check for the case where the content is coming from a
        // `matMenuContent` whose change detection tree is at the declaration position,
        // not the insertion position. See #23175.
        // @breaking-change 14.0.0 Remove null check for `_changeDetectorRef`.
        this._highlighted = isHighlighted;
        (_a = this._changeDetectorRef) === null || _a === void 0 ? void 0 : _a.markForCheck();
    }
}
MatMenuItem.decorators = [
    { type: Component, args: [{
                selector: '[mat-menu-item]',
                exportAs: 'matMenuItem',
                inputs: ['disabled', 'disableRipple'],
                host: {
                    '[attr.role]': 'role',
                    '[class.mat-menu-item]': 'true',
                    '[class.mat-menu-item-highlighted]': '_highlighted',
                    '[class.mat-menu-item-submenu-trigger]': '_triggersSubmenu',
                    '[attr.tabindex]': '_getTabIndex()',
                    '[attr.aria-disabled]': 'disabled.toString()',
                    '[attr.disabled]': 'disabled || null',
                    'class': 'mat-focus-indicator',
                },
                changeDetection: ChangeDetectionStrategy.OnPush,
                encapsulation: ViewEncapsulation.None,
                template: "<ng-content></ng-content>\n<div class=\"mat-menu-ripple\" matRipple\n     [matRippleDisabled]=\"disableRipple || disabled\"\n     [matRippleTrigger]=\"_getHostElement()\">\n</div>\n\n<svg\n  *ngIf=\"_triggersSubmenu\"\n  class=\"mat-menu-submenu-icon\"\n  viewBox=\"0 0 5 10\"\n  focusable=\"false\"><polygon points=\"0,0 5,5 0,10\"/></svg>\n"
            },] }
];
MatMenuItem.ctorParameters = () => [
    { type: ElementRef },
    { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
    { type: FocusMonitor },
    { type: undefined, decorators: [{ type: Inject, args: [MAT_MENU_PANEL,] }, { type: Optional }] },
    { type: ChangeDetectorRef }
];
MatMenuItem.propDecorators = {
    role: [{ type: Input }],
    _checkDisabled: [{ type: HostListener, args: ['click', ['$event'],] }],
    _handleMouseEnter: [{ type: HostListener, args: ['mouseenter',] }]
};

/**
 * @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
 */
/** Injection token to be used to override the default options for `mat-menu`. */
const MAT_MENU_DEFAULT_OPTIONS = new InjectionToken('mat-menu-default-options', {
    providedIn: 'root',
    factory: MAT_MENU_DEFAULT_OPTIONS_FACTORY
});
/** @docs-private */
function MAT_MENU_DEFAULT_OPTIONS_FACTORY() {
    return {
        overlapTrigger: false,
        xPosition: 'after',
        yPosition: 'below',
        backdropClass: 'cdk-overlay-transparent-backdrop',
    };
}
let menuPanelUid = 0;
/** Base class with all of the `MatMenu` functionality. */
class _MatMenuBase {
    constructor(_elementRef, _ngZone, _defaultOptions) {
        this._elementRef = _elementRef;
        this._ngZone = _ngZone;
        this._defaultOptions = _defaultOptions;
        this._xPosition = this._defaultOptions.xPosition;
        this._yPosition = this._defaultOptions.yPosition;
        /** Only the direct descendant menu items. */
        this._directDescendantItems = new QueryList();
        /** Subscription to tab events on the menu panel */
        this._tabSubscription = Subscription.EMPTY;
        /** Config object to be passed into the menu's ngClass */
        this._classList = {};
        /** Current state of the panel animation. */
        this._panelAnimationState = 'void';
        /** Emits whenever an animation on the menu completes. */
        this._animationDone = new Subject();
        /** Class or list of classes to be added to the overlay panel. */
        this.overlayPanelClass = this._defaultOptions.overlayPanelClass || '';
        /** Class to be added to the backdrop element. */
        this.backdropClass = this._defaultOptions.backdropClass;
        this._overlapTrigger = this._defaultOptions.overlapTrigger;
        this._hasBackdrop = this._defaultOptions.hasBackdrop;
        /** Event emitted when the menu is closed. */
        this.closed = new EventEmitter();
        /**
         * Event emitted when the menu is closed.
         * @deprecated Switch to `closed` instead
         * @breaking-change 8.0.0
         */
        this.close = this.closed;
        this.panelId = `mat-menu-panel-${menuPanelUid++}`;
    }
    /** Position of the menu in the X axis. */
    get xPosition() { return this._xPosition; }
    set xPosition(value) {
        if (value !== 'before' && value !== 'after' &&
            (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throwMatMenuInvalidPositionX();
        }
        this._xPosition = value;
        this.setPositionClasses();
    }
    /** Position of the menu in the Y axis. */
    get yPosition() { return this._yPosition; }
    set yPosition(value) {
        if (value !== 'above' && value !== 'below' && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throwMatMenuInvalidPositionY();
        }
        this._yPosition = value;
        this.setPositionClasses();
    }
    /** Whether the menu should overlap its trigger. */
    get overlapTrigger() { return this._overlapTrigger; }
    set overlapTrigger(value) {
        this._overlapTrigger = coerceBooleanProperty(value);
    }
    /** Whether the menu has a backdrop. */
    get hasBackdrop() { return this._hasBackdrop; }
    set hasBackdrop(value) {
        this._hasBackdrop = coerceBooleanProperty(value);
    }
    /**
     * This method takes classes set on the host mat-menu element and applies them on the
     * menu template that displays in the overlay container.  Otherwise, it's difficult
     * to style the containing menu from outside the component.
     * @param classes list of class names
     */
    set panelClass(classes) {
        const previousPanelClass = this._previousPanelClass;
        if (previousPanelClass && previousPanelClass.length) {
            previousPanelClass.split(' ').forEach((className) => {
                this._classList[className] = false;
            });
        }
        this._previousPanelClass = classes;
        if (classes && classes.length) {
            classes.split(' ').forEach((className) => {
                this._classList[className] = true;
            });
            this._elementRef.nativeElement.className = '';
        }
    }
    /**
     * This method takes classes set on the host mat-menu element and applies them on the
     * menu template that displays in the overlay container.  Otherwise, it's difficult
     * to style the containing menu from outside the component.
     * @deprecated Use `panelClass` instead.
     * @breaking-change 8.0.0
     */
    get classList() { return this.panelClass; }
    set classList(classes) { this.panelClass = classes; }
    ngOnInit() {
        this.setPositionClasses();
    }
    ngAfterContentInit() {
        this._updateDirectDescendants();
        this._keyManager = new FocusKeyManager(this._directDescendantItems)
            .withWrap()
            .withTypeAhead()
            .withHomeAndEnd();
        this._tabSubscription = this._keyManager.tabOut.subscribe(() => this.closed.emit('tab'));
        // If a user manually (programmatically) focuses a menu item, we need to reflect that focus
        // change back to the key manager. Note that we don't need to unsubscribe here because _focused
        // is internal and we know that it gets completed on destroy.
        this._directDescendantItems.changes.pipe(startWith(this._directDescendantItems), switchMap(items => merge(...items.map((item) => item._focused)))).subscribe(focusedItem => this._keyManager.updateActiveItem(focusedItem));
    }
    ngOnDestroy() {
        this._directDescendantItems.destroy();
        this._tabSubscription.unsubscribe();
        this.closed.complete();
    }
    /** Stream that emits whenever the hovered menu item changes. */
    _hovered() {
        // Coerce the `changes` property because Angular types it as `Observable<any>`
        const itemChanges = this._directDescendantItems.changes;
        return itemChanges.pipe(startWith(this._directDescendantItems), switchMap(items => merge(...items.map((item) => item._hovered))));
    }
    /*
     * Registers a menu item with the menu.
     * @docs-private
     * @deprecated No longer being used. To be removed.
     * @breaking-change 9.0.0
     */
    addItem(_item) { }
    /**
     * Removes an item from the menu.
     * @docs-private
     * @deprecated No longer being used. To be removed.
     * @breaking-change 9.0.0
     */
    removeItem(_item) { }
    /** Handle a keyboard event from the menu, delegating to the appropriate action. */
    _handleKeydown(event) {
        const keyCode = event.keyCode;
        const manager = this._keyManager;
        switch (keyCode) {
            case ESCAPE:
                if (!hasModifierKey(event)) {
                    event.preventDefault();
                    this.closed.emit('keydown');
                }
                break;
            case LEFT_ARROW:
                if (this.parentMenu && this.direction === 'ltr') {
                    this.closed.emit('keydown');
                }
                break;
            case RIGHT_ARROW:
                if (this.parentMenu && this.direction === 'rtl') {
                    this.closed.emit('keydown');
                }
                break;
            default:
                if (keyCode === UP_ARROW || keyCode === DOWN_ARROW) {
                    manager.setFocusOrigin('keyboard');
                }
                manager.onKeydown(event);
        }
    }
    /**
     * Focus the first item in the menu.
     * @param origin Action from which the focus originated. Used to set the correct styling.
     */
    focusFirstItem(origin = 'program') {
        // When the content is rendered lazily, it takes a bit before the items are inside the DOM.
        if (this.lazyContent) {
            this._ngZone.onStable
                .pipe(take(1))
                .subscribe(() => this._focusFirstItem(origin));
        }
        else {
            this._focusFirstItem(origin);
        }
    }
    /**
     * Actual implementation that focuses the first item. Needs to be separated
     * out so we don't repeat the same logic in the public `focusFirstItem` method.
     */
    _focusFirstItem(origin) {
        const manager = this._keyManager;
        manager.setFocusOrigin(origin).setFirstItemActive();
        // If there's no active item at this point, it means that all the items are disabled.
        // Move focus to the menu panel so keyboard events like Escape still work. Also this will
        // give _some_ feedback to screen readers.
        if (!manager.activeItem && this._directDescendantItems.length) {
            let element = this._directDescendantItems.first._getHostElement().parentElement;
            // Because the `mat-menu` is at the DOM insertion point, not inside the overlay, we don't
            // have a nice way of getting a hold of the menu panel. We can't use a `ViewChild` either
            // because the panel is inside an `ng-template`. We work around it by starting from one of
            // the items and walking up the DOM.
            while (element) {
                if (element.getAttribute('role') === 'menu') {
                    element.focus();
                    break;
                }
                else {
                    element = element.parentElement;
                }
            }
        }
    }
    /**
     * Resets the active item in the menu. This is used when the menu is opened, allowing
     * the user to start from the first option when pressing the down arrow.
     */
    resetActiveItem() {
        this._keyManager.setActiveItem(-1);
    }
    /**
     * Sets the menu panel elevation.
     * @param depth Number of parent menus that come before the menu.
     */
    setElevation(depth) {
        // The elevation starts at the base and increases by one for each level.
        // Capped at 24 because that's the maximum elevation defined in the Material design spec.
        const elevation = Math.min(this._baseElevation + depth, 24);
        const newElevation = `${this._elevationPrefix}${elevation}`;
        const customElevation = Object.keys(this._classList).find(className => {
            return className.startsWith(this._elevationPrefix);
        });
        if (!customElevation || customElevation === this._previousElevation) {
            if (this._previousElevation) {
                this._classList[this._previousElevation] = false;
            }
            this._classList[newElevation] = true;
            this._previousElevation = newElevation;
        }
    }
    /**
     * Adds classes to the menu panel based on its position. Can be used by
     * consumers to add specific styling based on the position.
     * @param posX Position of the menu along the x axis.
     * @param posY Position of the menu along the y axis.
     * @docs-private
     */
    setPositionClasses(posX = this.xPosition, posY = this.yPosition) {
        const classes = this._classList;
        classes['mat-menu-before'] = posX === 'before';
        classes['mat-menu-after'] = posX === 'after';
        classes['mat-menu-above'] = posY === 'above';
        classes['mat-menu-below'] = posY === 'below';
    }
    /** Starts the enter animation. */
    _startAnimation() {
        // @breaking-change 8.0.0 Combine with _resetAnimation.
        this._panelAnimationState = 'enter';
    }
    /** Resets the panel animation to its initial state. */
    _resetAnimation() {
        // @breaking-change 8.0.0 Combine with _startAnimation.
        this._panelAnimationState = 'void';
    }
    /** Callback that is invoked when the panel animation completes. */
    _onAnimationDone(event) {
        this._animationDone.next(event);
        this._isAnimating = false;
    }
    _onAnimationStart(event) {
        this._isAnimating = true;
        // Scroll the content element to the top as soon as the animation starts. This is necessary,
        // because we move focus to the first item while it's still being animated, which can throw
        // the browser off when it determines the scroll position. Alternatively we can move focus
        // when the animation is done, however moving focus asynchronously will interrupt screen
        // readers which are in the process of reading out the menu already. We take the `element`
        // from the `event` since we can't use a `ViewChild` to access the pane.
        if (event.toState === 'enter' && this._keyManager.activeItemIndex === 0) {
            event.element.scrollTop = 0;
        }
    }
    /**
     * Sets up a stream that will keep track of any newly-added menu items and will update the list
     * of direct descendants. We collect the descendants this way, because `_allItems` can include
     * items that are part of child menus, and using a custom way of registering items is unreliable
     * when it comes to maintaining the item order.
     */
    _updateDirectDescendants() {
        this._allItems.changes
            .pipe(startWith(this._allItems))
            .subscribe((items) => {
            this._directDescendantItems.reset(items.filter(item => item._parentMenu === this));
            this._directDescendantItems.notifyOnChanges();
        });
    }
}
_MatMenuBase.decorators = [
    { type: Directive }
];
_MatMenuBase.ctorParameters = () => [
    { type: ElementRef },
    { type: NgZone },
    { type: undefined, decorators: [{ type: Inject, args: [MAT_MENU_DEFAULT_OPTIONS,] }] }
];
_MatMenuBase.propDecorators = {
    _allItems: [{ type: ContentChildren, args: [MatMenuItem, { descendants: true },] }],
    backdropClass: [{ type: Input }],
    ariaLabel: [{ type: Input, args: ['aria-label',] }],
    ariaLabelledby: [{ type: Input, args: ['aria-labelledby',] }],
    ariaDescribedby: [{ type: Input, args: ['aria-describedby',] }],
    xPosition: [{ type: Input }],
    yPosition: [{ type: Input }],
    templateRef: [{ type: ViewChild, args: [TemplateRef,] }],
    items: [{ type: ContentChildren, args: [MatMenuItem, { descendants: false },] }],
    lazyContent: [{ type: ContentChild, args: [MAT_MENU_CONTENT,] }],
    overlapTrigger: [{ type: Input }],
    hasBackdrop: [{ type: Input }],
    panelClass: [{ type: Input, args: ['class',] }],
    classList: [{ type: Input }],
    closed: [{ type: Output }],
    close: [{ type: Output }]
};
/** @docs-public MatMenu */
class MatMenu extends _MatMenuBase {
    constructor(elementRef, ngZone, defaultOptions) {
        super(elementRef, ngZone, defaultOptions);
        this._elevationPrefix = 'mat-elevation-z';
        this._baseElevation = 4;
    }
}
MatMenu.decorators = [
    { type: Component, args: [{
                selector: 'mat-menu',
                template: "<ng-template>\n  <div\n    class=\"mat-menu-panel\"\n    [id]=\"panelId\"\n    [ngClass]=\"_classList\"\n    (keydown)=\"_handleKeydown($event)\"\n    (click)=\"closed.emit('click')\"\n    [@transformMenu]=\"_panelAnimationState\"\n    (@transformMenu.start)=\"_onAnimationStart($event)\"\n    (@transformMenu.done)=\"_onAnimationDone($event)\"\n    tabindex=\"-1\"\n    role=\"menu\"\n    [attr.aria-label]=\"ariaLabel || null\"\n    [attr.aria-labelledby]=\"ariaLabelledby || null\"\n    [attr.aria-describedby]=\"ariaDescribedby || null\">\n    <div class=\"mat-menu-content\">\n      <ng-content></ng-content>\n    </div>\n  </div>\n</ng-template>\n",
                changeDetection: ChangeDetectionStrategy.OnPush,
                encapsulation: ViewEncapsulation.None,
                exportAs: 'matMenu',
                host: {
                    '[attr.aria-label]': 'null',
                    '[attr.aria-labelledby]': 'null',
                    '[attr.aria-describedby]': 'null',
                },
                animations: [
                    matMenuAnimations.transformMenu,
                    matMenuAnimations.fadeInItems
                ],
                providers: [
                    { provide: MAT_MENU_PANEL, useExisting: MatMenu },
                ],
                styles: ["mat-menu{display:none}.mat-menu-panel{min-width:112px;max-width:280px;overflow:auto;-webkit-overflow-scrolling:touch;max-height:calc(100vh - 48px);border-radius:4px;outline:0;min-height:64px}.mat-menu-panel.ng-animating{pointer-events:none}.cdk-high-contrast-active .mat-menu-panel{outline:solid 1px}.mat-menu-content:not(:empty){padding-top:8px;padding-bottom:8px}.mat-menu-item{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;cursor:pointer;outline:none;border:none;-webkit-tap-highlight-color:transparent;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block;line-height:48px;height:48px;padding:0 16px;text-align:left;text-decoration:none;max-width:100%;position:relative}.mat-menu-item::-moz-focus-inner{border:0}.mat-menu-item[disabled]{cursor:default}[dir=rtl] .mat-menu-item{text-align:right}.mat-menu-item .mat-icon{margin-right:16px;vertical-align:middle}.mat-menu-item .mat-icon svg{vertical-align:top}[dir=rtl] .mat-menu-item .mat-icon{margin-left:16px;margin-right:0}.mat-menu-item[disabled]{pointer-events:none}.cdk-high-contrast-active .mat-menu-item{margin-top:1px}.cdk-high-contrast-active .mat-menu-item.cdk-program-focused,.cdk-high-contrast-active .mat-menu-item.cdk-keyboard-focused,.cdk-high-contrast-active .mat-menu-item-highlighted{outline:dotted 1px}.mat-menu-item-submenu-trigger{padding-right:32px}[dir=rtl] .mat-menu-item-submenu-trigger{padding-right:16px;padding-left:32px}.mat-menu-submenu-icon{position:absolute;top:50%;right:16px;transform:translateY(-50%);width:5px;height:10px;fill:currentColor}[dir=rtl] .mat-menu-submenu-icon{right:auto;left:16px;transform:translateY(-50%) scaleX(-1)}.cdk-high-contrast-active .mat-menu-submenu-icon{fill:CanvasText}button.mat-menu-item{width:100%}.mat-menu-item .mat-menu-ripple{top:0;left:0;right:0;bottom:0;position:absolute;pointer-events:none}\n"]
            },] }
];
MatMenu.ctorParameters = () => [
    { type: ElementRef },
    { type: NgZone },
    { type: undefined, decorators: [{ type: Inject, args: [MAT_MENU_DEFAULT_OPTIONS,] }] }
];

/**
 * @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
 */
/** Injection token that determines the scroll handling while the menu is open. */
const MAT_MENU_SCROLL_STRATEGY = new InjectionToken('mat-menu-scroll-strategy');
/** @docs-private */
function MAT_MENU_SCROLL_STRATEGY_FACTORY(overlay) {
    return () => overlay.scrollStrategies.reposition();
}
/** @docs-private */
const MAT_MENU_SCROLL_STRATEGY_FACTORY_PROVIDER = {
    provide: MAT_MENU_SCROLL_STRATEGY,
    deps: [Overlay],
    useFactory: MAT_MENU_SCROLL_STRATEGY_FACTORY,
};
/** Default top padding of the menu panel. */
const MENU_PANEL_TOP_PADDING = 8;
/** Options for binding a passive event listener. */
const passiveEventListenerOptions = normalizePassiveListenerOptions({ passive: true });
// TODO(andrewseguin): Remove the kebab versions in favor of camelCased attribute selectors
class _MatMenuTriggerBase {
    constructor(_overlay, _element, _viewContainerRef, scrollStrategy, parentMenu, 
    // `MatMenuTrigger` is commonly used in combination with a `MatMenuItem`.
    // tslint:disable-next-line: lightweight-tokens
    _menuItemInstance, _dir, 
    // TODO(crisbeto): make the _focusMonitor required when doing breaking changes.
    // @breaking-change 8.0.0
    _focusMonitor) {
        this._overlay = _overlay;
        this._element = _element;
        this._viewContainerRef = _viewContainerRef;
        this._menuItemInstance = _menuItemInstance;
        this._dir = _dir;
        this._focusMonitor = _focusMonitor;
        this._overlayRef = null;
        this._menuOpen = false;
        this._closingActionsSubscription = Subscription.EMPTY;
        this._hoverSubscription = Subscription.EMPTY;
        this._menuCloseSubscription = Subscription.EMPTY;
        /**
         * Handles touch start events on the trigger.
         * Needs to be an arrow function so we can easily use addEventListener and removeEventListener.
         */
        this._handleTouchStart = (event) => {
            if (!isFakeTouchstartFromScreenReader(event)) {
                this._openedBy = 'touch';
            }
        };
        // Tracking input type is necessary so it's possible to only auto-focus
        // the first item of the list when the menu is opened via the keyboard
        this._openedBy = undefined;
        this._ariaHaspopup = true;
        /**
         * Whether focus should be restored when the menu is closed.
         * Note that disabling this option can have accessibility implications
         * and it's up to you to manage focus, if you decide to turn it off.
         */
        this.restoreFocus = true;
        /** Event emitted when the associated menu is opened. */
        this.menuOpened = new EventEmitter();
        /**
         * Event emitted when the associated menu is opened.
         * @deprecated Switch to `menuOpened` instead
         * @breaking-change 8.0.0
         */
        // tslint:disable-next-line:no-output-on-prefix
        this.onMenuOpen = this.menuOpened;
        /** Event emitted when the associated menu is closed. */
        this.menuClosed = new EventEmitter();
        /**
         * Event emitted when the associated menu is closed.
         * @deprecated Switch to `menuClosed` instead
         * @breaking-change 8.0.0
         */
        // tslint:disable-next-line:no-output-on-prefix
        this.onMenuClose = this.menuClosed;
        this._scrollStrategy = scrollStrategy;
        this._parentMaterialMenu = parentMenu instanceof _MatMenuBase ? parentMenu : undefined;
        _element.nativeElement.addEventListener('touchstart', this._handleTouchStart, passiveEventListenerOptions);
        if (_menuItemInstance) {
            _menuItemInstance._triggersSubmenu = this.triggersSubmenu();
        }
    }
    get _ariaExpanded() {
        return this.menuOpen || null;
    }
    get _ariaControl() {
        return this.menuOpen ? this.menu.panelId : null;
    }
    /**
     * @deprecated
     * @breaking-change 8.0.0
     */
    get _deprecatedMatMenuTriggerFor() { return this.menu; }
    set _deprecatedMatMenuTriggerFor(v) {
        this.menu = v;
    }
    /** References the menu instance that the trigger is associated with. */
    get menu() { return this._menu; }
    set menu(menu) {
        if (menu === this._menu) {
            return;
        }
        this._menu = menu;
        this._menuCloseSubscription.unsubscribe();
        if (menu) {
            if (menu === this._parentMaterialMenu && (typeof ngDevMode === 'undefined' || ngDevMode)) {
                throwMatMenuRecursiveError();
            }
            this._menuCloseSubscription = menu.close.subscribe((reason) => {
                this._destroyMenu(reason);
                // If a click closed the menu, we should close the entire chain of nested menus.
                if ((reason === 'click' || reason === 'tab') && this._parentMaterialMenu) {
                    this._parentMaterialMenu.closed.emit(reason);
                }
            });
        }
    }
    ngAfterContentInit() {
        this._checkMenu();
        this._handleHover();
    }
    ngOnDestroy() {
        if (this._overlayRef) {
            this._overlayRef.dispose();
            this._overlayRef = null;
        }
        this._element.nativeElement.removeEventListener('touchstart', this._handleTouchStart, passiveEventListenerOptions);
        this._menuCloseSubscription.unsubscribe();
        this._closingActionsSubscription.unsubscribe();
        this._hoverSubscription.unsubscribe();
    }
    /** Whether the menu is open. */
    get menuOpen() {
        return this._menuOpen;
    }
    /** The text direction of the containing app. */
    get dir() {
        return this._dir && this._dir.value === 'rtl' ? 'rtl' : 'ltr';
    }
    /** Whether the menu triggers a sub-menu or a top-level one. */
    triggersSubmenu() {
        return !!(this._menuItemInstance && this._parentMaterialMenu);
    }
    /** Toggles the menu between the open and closed states. */
    toggleMenu() {
        return this._menuOpen ? this.closeMenu() : this.openMenu();
    }
    /** Opens the menu. */
    openMenu() {
        if (this._menuOpen) {
            return;
        }
        this._checkMenu();
        const overlayRef = this._createOverlay();
        const overlayConfig = overlayRef.getConfig();
        this._setPosition(overlayConfig.positionStrategy);
        overlayConfig.hasBackdrop = this.menu.hasBackdrop == null ? !this.triggersSubmenu() :
            this.menu.hasBackdrop;
        overlayRef.attach(this._getPortal());
        if (this.menu.lazyContent) {
            this.menu.lazyContent.attach(this.menuData);
        }
        this._closingActionsSubscription = this._menuClosingActions().subscribe(() => this.closeMenu());
        this._initMenu();
        if (this.menu instanceof _MatMenuBase) {
            this.menu._startAnimation();
        }
    }
    /** Closes the menu. */
    closeMenu() {
        this.menu.close.emit();
    }
    /**
     * Focuses the menu trigger.
     * @param origin Source of the menu trigger's focus.
     */
    focus(origin, options) {
        if (this._focusMonitor && origin) {
            this._focusMonitor.focusVia(this._element, origin, options);
        }
        else {
            this._element.nativeElement.focus(options);
        }
    }
    /**
     * Updates the position of the menu to ensure that it fits all options within the viewport.
     */
    updatePosition() {
        var _a;
        (_a = this._overlayRef) === null || _a === void 0 ? void 0 : _a.updatePosition();
    }
    /** Closes the menu and does the necessary cleanup. */
    _destroyMenu(reason) {
        if (!this._overlayRef || !this.menuOpen) {
            return;
        }
        const menu = this.menu;
        this._closingActionsSubscription.unsubscribe();
        this._overlayRef.detach();
        // Always restore focus if the user is navigating using the keyboard or the menu was opened
        // programmatically. We don't restore for non-root triggers, because it can prevent focus
        // from making it back to the root trigger when closing a long chain of menus by clicking
        // on the backdrop.
        if (this.restoreFocus && (reason === 'keydown' || !this._openedBy || !this.triggersSubmenu())) {
            this.focus(this._openedBy);
        }
        this._openedBy = undefined;
        if (menu instanceof _MatMenuBase) {
            menu._resetAnimation();
            if (menu.lazyContent) {
                // Wait for the exit animation to finish before detaching the content.
                menu._animationDone
                    .pipe(filter(event => event.toState === 'void'), take(1), 
                // Interrupt if the content got re-attached.
                takeUntil(menu.lazyContent._attached))
                    .subscribe({
                    next: () => menu.lazyContent.detach(),
                    // No matter whether the content got re-attached, reset the menu.
                    complete: () => this._setIsMenuOpen(false)
                });
            }
            else {
                this._setIsMenuOpen(false);
            }
        }
        else {
            this._setIsMenuOpen(false);
            if (menu.lazyContent) {
                menu.lazyContent.detach();
            }
        }
    }
    /**
     * This method sets the menu state to open and focuses the first item if
     * the menu was opened via the keyboard.
     */
    _initMenu() {
        this.menu.parentMenu = this.triggersSubmenu() ? this._parentMaterialMenu : undefined;
        this.menu.direction = this.dir;
        this._setMenuElevation();
        this.menu.focusFirstItem(this._openedBy || 'program');
        this._setIsMenuOpen(true);
    }
    /** Updates the menu elevation based on the amount of parent menus that it has. */
    _setMenuElevation() {
        if (this.menu.setElevation) {
            let depth = 0;
            let parentMenu = this.menu.parentMenu;
            while (parentMenu) {
                depth++;
                parentMenu = parentMenu.parentMenu;
            }
            this.menu.setElevation(depth);
        }
    }
    // set state rather than toggle to support triggers sharing a menu
    _setIsMenuOpen(isOpen) {
        this._menuOpen = isOpen;
        this._menuOpen ? this.menuOpened.emit() : this.menuClosed.emit();
        if (this.triggersSubmenu()) {
            this._menuItemInstance._setHighlighted(isOpen);
        }
    }
    /**
     * This method checks that a valid instance of MatMenu has been passed into
     * matMenuTriggerFor. If not, an exception is thrown.
     */
    _checkMenu() {
        if (!this.menu && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throwMatMenuMissingError();
        }
    }
    /**
     * This method creates the overlay from the provided menu's template and saves its
     * OverlayRef so that it can be attached to the DOM when openMenu is called.
     */
    _createOverlay() {
        if (!this._overlayRef) {
            const config = this._getOverlayConfig();
            this._subscribeToPositions(config.positionStrategy);
            this._overlayRef = this._overlay.create(config);
            // Consume the `keydownEvents` in order to prevent them from going to another overlay.
            // Ideally we'd also have our keyboard event logic in here, however doing so will
            // break anybody that may have implemented the `MatMenuPanel` themselves.
            this._overlayRef.keydownEvents().subscribe();
        }
        return this._overlayRef;
    }
    /**
     * This method builds the configuration object needed to create the overlay, the OverlayState.
     * @returns OverlayConfig
     */
    _getOverlayConfig() {
        return new OverlayConfig({
            positionStrategy: this._overlay.position()
                .flexibleConnectedTo(this._element)
                .withLockedPosition()
                .withGrowAfterOpen()
                .withTransformOriginOn('.mat-menu-panel, .mat-mdc-menu-panel'),
            backdropClass: this.menu.backdropClass || 'cdk-overlay-transparent-backdrop',
            panelClass: this.menu.overlayPanelClass,
            scrollStrategy: this._scrollStrategy(),
            direction: this._dir
        });
    }
    /**
     * Listens to changes in the position of the overlay and sets the correct classes
     * on the menu based on the new position. This ensures the animation origin is always
     * correct, even if a fallback position is used for the overlay.
     */
    _subscribeToPositions(position) {
        if (this.menu.setPositionClasses) {
            position.positionChanges.subscribe(change => {
                const posX = change.connectionPair.overlayX === 'start' ? 'after' : 'before';
                const posY = change.connectionPair.overlayY === 'top' ? 'below' : 'above';
                this.menu.setPositionClasses(posX, posY);
            });
        }
    }
    /**
     * Sets the appropriate positions on a position strategy
     * so the overlay connects with the trigger correctly.
     * @param positionStrategy Strategy whose position to update.
     */
    _setPosition(positionStrategy) {
        let [originX, originFallbackX] = this.menu.xPosition === 'before' ? ['end', 'start'] : ['start', 'end'];
        let [overlayY, overlayFallbackY] = this.menu.yPosition === 'above' ? ['bottom', 'top'] : ['top', 'bottom'];
        let [originY, originFallbackY] = [overlayY, overlayFallbackY];
        let [overlayX, overlayFallbackX] = [originX, originFallbackX];
        let offsetY = 0;
        if (this.triggersSubmenu()) {
            // When the menu is a sub-menu, it should always align itself
            // to the edges of the trigger, instead of overlapping it.
            overlayFallbackX = originX = this.menu.xPosition === 'before' ? 'start' : 'end';
            originFallbackX = overlayX = originX === 'end' ? 'start' : 'end';
            offsetY = overlayY === 'bottom' ? MENU_PANEL_TOP_PADDING : -MENU_PANEL_TOP_PADDING;
        }
        else if (!this.menu.overlapTrigger) {
            originY = overlayY === 'top' ? 'bottom' : 'top';
            originFallbackY = overlayFallbackY === 'top' ? 'bottom' : 'top';
        }
        positionStrategy.withPositions([
            { originX, originY, overlayX, overlayY, offsetY },
            { originX: originFallbackX, originY, overlayX: overlayFallbackX, overlayY, offsetY },
            {
                originX,
                originY: originFallbackY,
                overlayX,
                overlayY: overlayFallbackY,
                offsetY: -offsetY
            },
            {
                originX: originFallbackX,
                originY: originFallbackY,
                overlayX: overlayFallbackX,
                overlayY: overlayFallbackY,
                offsetY: -offsetY
            }
        ]);
    }
    /** Returns a stream that emits whenever an action that should close the menu occurs. */
    _menuClosingActions() {
        const backdrop = this._overlayRef.backdropClick();
        const detachments = this._overlayRef.detachments();
        const parentClose = this._parentMaterialMenu ? this._parentMaterialMenu.closed : of();
        const hover = this._parentMaterialMenu ? this._parentMaterialMenu._hovered().pipe(filter(active => active !== this._menuItemInstance), filter(() => this._menuOpen)) : of();
        return merge(backdrop, parentClose, hover, detachments);
    }
    /** Handles mouse presses on the trigger. */
    _handleMousedown(event) {
        if (!isFakeMousedownFromScreenReader(event)) {
            // Since right or middle button clicks won't trigger the `click` event,
            // we shouldn't consider the menu as opened by mouse in those cases.
            this._openedBy = event.button === 0 ? 'mouse' : undefined;
            // Since clicking on the trigger won't close the menu if it opens a sub-menu,
            // we should prevent focus from moving onto it via click to avoid the
            // highlight from lingering on the menu item.
            if (this.triggersSubmenu()) {
                event.preventDefault();
            }
        }
    }
    /** Handles key presses on the trigger. */
    _handleKeydown(event) {
        const keyCode = event.keyCode;
        // Pressing enter on the trigger will trigger the click handler later.
        if (keyCode === ENTER || keyCode === SPACE) {
            this._openedBy = 'keyboard';
        }
        if (this.triggersSubmenu() && ((keyCode === RIGHT_ARROW && this.dir === 'ltr') ||
            (keyCode === LEFT_ARROW && this.dir === 'rtl'))) {
            this._openedBy = 'keyboard';
            this.openMenu();
        }
    }
    /** Handles click events on the trigger. */
    _handleClick(event) {
        if (this.triggersSubmenu()) {
            // Stop event propagation to avoid closing the parent menu.
            event.stopPropagation();
            this.openMenu();
        }
        else {
            this.toggleMenu();
        }
    }
    /** Handles the cases where the user hovers over the trigger. */
    _handleHover() {
        // Subscribe to changes in the hovered item in order to toggle the panel.
        if (!this.triggersSubmenu() || !this._parentMaterialMenu) {
            return;
        }
        this._hoverSubscription = this._parentMaterialMenu._hovered()
            // Since we might have multiple competing triggers for the same menu (e.g. a sub-menu
            // with different data and triggers), we have to delay it by a tick to ensure that
            // it won't be closed immediately after it is opened.
            .pipe(filter(active => active === this._menuItemInstance && !active.disabled), delay(0, asapScheduler))
            .subscribe(() => {
            this._openedBy = 'mouse';
            // If the same menu is used between multiple triggers, it might still be animating
            // while the new trigger tries to re-open it. Wait for the animation to finish
            // before doing so. Also interrupt if the user moves to another item.
            if (this.menu instanceof _MatMenuBase && this.menu._isAnimating) {
                // We need the `delay(0)` here in order to avoid
                // 'changed after checked' errors in some cases. See #12194.
                this.menu._animationDone
                    .pipe(take(1), delay(0, asapScheduler), takeUntil(this._parentMaterialMenu._hovered()))
                    .subscribe(() => this.openMenu());
            }
            else {
                this.openMenu();
            }
        });
    }
    /** Gets the portal that should be attached to the overlay. */
    _getPortal() {
        // Note that we can avoid this check by keeping the portal on the menu panel.
        // While it would be cleaner, we'd have to introduce another required method on
        // `MatMenuPanel`, making it harder to consume.
        if (!this._portal || this._portal.templateRef !== this.menu.templateRef) {
            this._portal = new TemplatePortal(this.menu.templateRef, this._viewContainerRef);
        }
        return this._portal;
    }
}
_MatMenuTriggerBase.decorators = [
    { type: Directive }
];
_MatMenuTriggerBase.ctorParameters = () => [
    { type: Overlay },
    { type: ElementRef },
    { type: ViewContainerRef },
    { type: undefined, decorators: [{ type: Inject, args: [MAT_MENU_SCROLL_STRATEGY,] }] },
    { type: undefined, decorators: [{ type: Inject, args: [MAT_MENU_PANEL,] }, { type: Optional }] },
    { type: MatMenuItem, decorators: [{ type: Optional }, { type: Self }] },
    { type: Directionality, decorators: [{ type: Optional }] },
    { type: FocusMonitor }
];
_MatMenuTriggerBase.propDecorators = {
    _ariaExpanded: [{ type: HostBinding, args: ['attr.aria-expanded',] }],
    _ariaControl: [{ type: HostBinding, args: ['attr.aria-controls',] }],
    _ariaHaspopup: [{ type: HostBinding, args: ['attr.aria-haspopup',] }],
    _deprecatedMatMenuTriggerFor: [{ type: Input, args: ['mat-menu-trigger-for',] }],
    menu: [{ type: Input, args: ['matMenuTriggerFor',] }],
    menuData: [{ type: Input, args: ['matMenuTriggerData',] }],
    restoreFocus: [{ type: Input, args: ['matMenuTriggerRestoreFocus',] }],
    menuOpened: [{ type: Output }],
    onMenuOpen: [{ type: Output }],
    menuClosed: [{ type: Output }],
    onMenuClose: [{ type: Output }],
    _handleMousedown: [{ type: HostListener, args: ['mousedown', ['$event'],] }],
    _handleKeydown: [{ type: HostListener, args: ['keydown', ['$event'],] }],
    _handleClick: [{ type: HostListener, args: ['click', ['$event'],] }]
};
/** Directive applied to an element that should trigger a `mat-menu`. */
class MatMenuTrigger extends _MatMenuTriggerBase {
}
MatMenuTrigger.decorators = [
    { type: Directive, args: [{
                selector: `[mat-menu-trigger-for], [matMenuTriggerFor]`,
                host: {
                    'class': 'mat-menu-trigger',
                },
                exportAs: 'matMenuTrigger'
            },] }
];

/**
 * @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
 */
class MatMenuModule {
}
MatMenuModule.decorators = [
    { type: NgModule, args: [{
                imports: [
                    CommonModule,
                    MatCommonModule,
                    MatRippleModule,
                    OverlayModule,
                ],
                exports: [
                    CdkScrollableModule,
                    MatCommonModule,
                    MatMenu,
                    MatMenuItem,
                    MatMenuTrigger,
                    MatMenuContent
                ],
                declarations: [MatMenu, MatMenuItem, MatMenuTrigger, MatMenuContent],
                providers: [MAT_MENU_SCROLL_STRATEGY_FACTORY_PROVIDER]
            },] }
];

/**
 * @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
 */

/**
 * @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
 */

/**
 * Generated bundle index. Do not edit.
 */

export { MAT_MENU_CONTENT, MAT_MENU_DEFAULT_OPTIONS, MAT_MENU_PANEL, MAT_MENU_SCROLL_STRATEGY, MatMenu, MatMenuContent, MatMenuItem, MatMenuModule, MatMenuTrigger, _MatMenuBase, _MatMenuContentBase, _MatMenuTriggerBase, fadeInItems, matMenuAnimations, transformMenu, MAT_MENU_DEFAULT_OPTIONS_FACTORY as ɵangular_material_src_material_menu_menu_a, MAT_MENU_SCROLL_STRATEGY_FACTORY as ɵangular_material_src_material_menu_menu_b, MAT_MENU_SCROLL_STRATEGY_FACTORY_PROVIDER as ɵangular_material_src_material_menu_menu_c };
//# sourceMappingURL=menu.js.map