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/**
* @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 { FocusMonitor, isFakeMousedownFromScreenReader, isFakeTouchstartFromScreenReader, } from '@angular/cdk/a11y';
import { Directionality } from '@angular/cdk/bidi';
import { ENTER, LEFT_ARROW, RIGHT_ARROW, SPACE } from '@angular/cdk/keycodes';
import { Overlay, OverlayConfig, } from '@angular/cdk/overlay';
import { TemplatePortal } from '@angular/cdk/portal';
import { Directive, ElementRef, EventEmitter, Inject, InjectionToken, Input, Optional, Output, Self, ViewContainerRef, } from '@angular/core';
import { normalizePassiveListenerOptions } from '@angular/cdk/platform';
import { asapScheduler, merge, of as observableOf, Subscription } from 'rxjs';
import { delay, filter, take, takeUntil } from 'rxjs/operators';
import { _MatMenuBase } from './menu';
import { throwMatMenuMissingError, throwMatMenuRecursiveError } from './menu-errors';
import { MatMenuItem } from './menu-item';
import { MAT_MENU_PANEL } from './menu-panel';
/** Injection token that determines the scroll handling while the menu is open. */
export const MAT_MENU_SCROLL_STRATEGY = new InjectionToken('mat-menu-scroll-strategy');
/** @docs-private */
export function MAT_MENU_SCROLL_STRATEGY_FACTORY(overlay) {
return () => overlay.scrollStrategies.reposition();
}
/** @docs-private */
export 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. */
export 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
/** Directive applied to an element that should trigger a `mat-menu`. */
export class MatMenuTrigger {
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;
/**
* 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();
}
}
/**
* @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);
}
}
/** 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._highlighted = 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 : observableOf();
const hover = this._parentMaterialMenu ? this._parentMaterialMenu._hovered().pipe(filter(active => active !== this._menuItemInstance), filter(() => this._menuOpen)) : observableOf();
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;
}
}
MatMenuTrigger.decorators = [
{ type: Directive, args: [{
selector: `[mat-menu-trigger-for], [matMenuTriggerFor]`,
host: {
'class': 'mat-menu-trigger',
'aria-haspopup': 'true',
'[attr.aria-expanded]': 'menuOpen || null',
'[attr.aria-controls]': 'menuOpen ? menu.panelId : null',
'(mousedown)': '_handleMousedown($event)',
'(keydown)': '_handleKeydown($event)',
'(click)': '_handleClick($event)',
},
exportAs: 'matMenuTrigger'
},] }
];
MatMenuTrigger.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 }
];
MatMenuTrigger.propDecorators = {
_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 }]
};
//# 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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 {\n  FocusMonitor,\n  FocusOrigin,\n  isFakeMousedownFromScreenReader,\n  isFakeTouchstartFromScreenReader,\n} from '@angular/cdk/a11y';\nimport {Direction, Directionality} from '@angular/cdk/bidi';\nimport {ENTER, LEFT_ARROW, RIGHT_ARROW, SPACE} from '@angular/cdk/keycodes';\nimport {\n  FlexibleConnectedPositionStrategy,\n  HorizontalConnectionPos,\n  Overlay,\n  OverlayConfig,\n  OverlayRef,\n  VerticalConnectionPos,\n  ScrollStrategy,\n} from '@angular/cdk/overlay';\nimport {TemplatePortal} from '@angular/cdk/portal';\nimport {\n  AfterContentInit,\n  Directive,\n  ElementRef,\n  EventEmitter,\n  Inject,\n  InjectionToken,\n  Input,\n  OnDestroy,\n  Optional,\n  Output,\n  Self,\n  ViewContainerRef,\n} from '@angular/core';\nimport {normalizePassiveListenerOptions} from '@angular/cdk/platform';\nimport {asapScheduler, merge, of as observableOf, Subscription} from 'rxjs';\nimport {delay, filter, take, takeUntil} from 'rxjs/operators';\nimport {MenuCloseReason, _MatMenuBase} from './menu';\nimport {throwMatMenuMissingError, throwMatMenuRecursiveError} from './menu-errors';\nimport {MatMenuItem} from './menu-item';\nimport {MatMenuPanel, MAT_MENU_PANEL} from './menu-panel';\nimport {MenuPositionX, MenuPositionY} from './menu-positions';\n\n/** Injection token that determines the scroll handling while the menu is open. */\nexport const MAT_MENU_SCROLL_STRATEGY =\n    new InjectionToken<() => ScrollStrategy>('mat-menu-scroll-strategy');\n\n/** @docs-private */\nexport function MAT_MENU_SCROLL_STRATEGY_FACTORY(overlay: Overlay): () => ScrollStrategy {\n  return () => overlay.scrollStrategies.reposition();\n}\n\n/** @docs-private */\nexport const MAT_MENU_SCROLL_STRATEGY_FACTORY_PROVIDER = {\n  provide: MAT_MENU_SCROLL_STRATEGY,\n  deps: [Overlay],\n  useFactory: MAT_MENU_SCROLL_STRATEGY_FACTORY,\n};\n\n/** Default top padding of the menu panel. */\nexport const MENU_PANEL_TOP_PADDING = 8;\n\n/** Options for binding a passive event listener. */\nconst passiveEventListenerOptions = normalizePassiveListenerOptions({passive: true});\n\n// TODO(andrewseguin): Remove the kebab versions in favor of camelCased attribute selectors\n\n/** Directive applied to an element that should trigger a `mat-menu`. */\n@Directive({\n  selector: `[mat-menu-trigger-for], [matMenuTriggerFor]`,\n  host: {\n    'class': 'mat-menu-trigger',\n    'aria-haspopup': 'true',\n    '[attr.aria-expanded]': 'menuOpen || null',\n    '[attr.aria-controls]': 'menuOpen ? menu.panelId : null',\n    '(mousedown)': '_handleMousedown($event)',\n    '(keydown)': '_handleKeydown($event)',\n    '(click)': '_handleClick($event)',\n  },\n  exportAs: 'matMenuTrigger'\n})\nexport class MatMenuTrigger implements AfterContentInit, OnDestroy {\n  private _portal: TemplatePortal;\n  private _overlayRef: OverlayRef | null = null;\n  private _menuOpen: boolean = false;\n  private _closingActionsSubscription = Subscription.EMPTY;\n  private _hoverSubscription = Subscription.EMPTY;\n  private _menuCloseSubscription = Subscription.EMPTY;\n  private _scrollStrategy: () => ScrollStrategy;\n\n  /**\n   * We're specifically looking for a `MatMenu` here since the generic `MatMenuPanel`\n   * interface lacks some functionality around nested menus and animations.\n   */\n  private _parentMaterialMenu: _MatMenuBase | undefined;\n\n  /**\n   * Handles touch start events on the trigger.\n   * Needs to be an arrow function so we can easily use addEventListener and removeEventListener.\n   */\n  private _handleTouchStart = (event: TouchEvent) => {\n    if (!isFakeTouchstartFromScreenReader(event)) {\n      this._openedBy = 'touch';\n    }\n  }\n\n  // Tracking input type is necessary so it's possible to only auto-focus\n  // the first item of the list when the menu is opened via the keyboard\n  _openedBy: Exclude<FocusOrigin, 'program' | null> | undefined = undefined;\n\n  /**\n   * @deprecated\n   * @breaking-change 8.0.0\n   */\n  @Input('mat-menu-trigger-for')\n  get _deprecatedMatMenuTriggerFor(): MatMenuPanel { return this.menu; }\n  set _deprecatedMatMenuTriggerFor(v: MatMenuPanel) {\n    this.menu = v;\n  }\n\n  /** References the menu instance that the trigger is associated with. */\n  @Input('matMenuTriggerFor')\n  get menu() { return this._menu; }\n  set menu(menu: MatMenuPanel) {\n    if (menu === this._menu) {\n      return;\n    }\n\n    this._menu = menu;\n    this._menuCloseSubscription.unsubscribe();\n\n    if (menu) {\n      if (menu === this._parentMaterialMenu && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n        throwMatMenuRecursiveError();\n      }\n\n      this._menuCloseSubscription = menu.close.subscribe((reason: MenuCloseReason) => {\n        this._destroyMenu(reason);\n\n        // If a click closed the menu, we should close the entire chain of nested menus.\n        if ((reason === 'click' || reason === 'tab') && this._parentMaterialMenu) {\n          this._parentMaterialMenu.closed.emit(reason);\n        }\n      });\n    }\n  }\n  private _menu: MatMenuPanel;\n\n  /** Data to be passed along to any lazily-rendered content. */\n  @Input('matMenuTriggerData') menuData: any;\n\n  /**\n   * Whether focus should be restored when the menu is closed.\n   * Note that disabling this option can have accessibility implications\n   * and it's up to you to manage focus, if you decide to turn it off.\n   */\n  @Input('matMenuTriggerRestoreFocus') restoreFocus: boolean = true;\n\n  /** Event emitted when the associated menu is opened. */\n  @Output() readonly menuOpened: EventEmitter<void> = new EventEmitter<void>();\n\n  /**\n   * Event emitted when the associated menu is opened.\n   * @deprecated Switch to `menuOpened` instead\n   * @breaking-change 8.0.0\n   */\n  // tslint:disable-next-line:no-output-on-prefix\n  @Output() readonly onMenuOpen: EventEmitter<void> = this.menuOpened;\n\n  /** Event emitted when the associated menu is closed. */\n  @Output() readonly menuClosed: EventEmitter<void> = new EventEmitter<void>();\n\n  /**\n   * Event emitted when the associated menu is closed.\n   * @deprecated Switch to `menuClosed` instead\n   * @breaking-change 8.0.0\n   */\n  // tslint:disable-next-line:no-output-on-prefix\n  @Output() readonly onMenuClose: EventEmitter<void> = this.menuClosed;\n\n  constructor(private _overlay: Overlay,\n              private _element: ElementRef<HTMLElement>,\n              private _viewContainerRef: ViewContainerRef,\n              @Inject(MAT_MENU_SCROLL_STRATEGY) scrollStrategy: any,\n              @Inject(MAT_MENU_PANEL) @Optional() parentMenu: MatMenuPanel,\n              // `MatMenuTrigger` is commonly used in combination with a `MatMenuItem`.\n              // tslint:disable-next-line: lightweight-tokens\n              @Optional() @Self() private _menuItemInstance: MatMenuItem,\n              @Optional() private _dir: Directionality,\n              // TODO(crisbeto): make the _focusMonitor required when doing breaking changes.\n              // @breaking-change 8.0.0\n              private _focusMonitor?: FocusMonitor) {\n    this._scrollStrategy = scrollStrategy;\n    this._parentMaterialMenu = parentMenu instanceof _MatMenuBase ? parentMenu : undefined;\n\n    _element.nativeElement.addEventListener('touchstart', this._handleTouchStart,\n        passiveEventListenerOptions);\n\n    if (_menuItemInstance) {\n      _menuItemInstance._triggersSubmenu = this.triggersSubmenu();\n    }\n  }\n\n  ngAfterContentInit() {\n    this._checkMenu();\n    this._handleHover();\n  }\n\n  ngOnDestroy() {\n    if (this._overlayRef) {\n      this._overlayRef.dispose();\n      this._overlayRef = null;\n    }\n\n    this._element.nativeElement.removeEventListener('touchstart', this._handleTouchStart,\n        passiveEventListenerOptions);\n\n    this._menuCloseSubscription.unsubscribe();\n    this._closingActionsSubscription.unsubscribe();\n    this._hoverSubscription.unsubscribe();\n  }\n\n  /** Whether the menu is open. */\n  get menuOpen(): boolean {\n    return this._menuOpen;\n  }\n\n  /** The text direction of the containing app. */\n  get dir(): Direction {\n    return this._dir && this._dir.value === 'rtl' ? 'rtl' : 'ltr';\n  }\n\n  /** Whether the menu triggers a sub-menu or a top-level one. */\n  triggersSubmenu(): boolean {\n    return !!(this._menuItemInstance && this._parentMaterialMenu);\n  }\n\n  /** Toggles the menu between the open and closed states. */\n  toggleMenu(): void {\n    return this._menuOpen ? this.closeMenu() : this.openMenu();\n  }\n\n  /** Opens the menu. */\n  openMenu(): void {\n    if (this._menuOpen) {\n      return;\n    }\n\n    this._checkMenu();\n\n    const overlayRef = this._createOverlay();\n    const overlayConfig = overlayRef.getConfig();\n\n    this._setPosition(overlayConfig.positionStrategy as FlexibleConnectedPositionStrategy);\n    overlayConfig.hasBackdrop = this.menu.hasBackdrop == null ? !this.triggersSubmenu() :\n        this.menu.hasBackdrop;\n    overlayRef.attach(this._getPortal());\n\n    if (this.menu.lazyContent) {\n      this.menu.lazyContent.attach(this.menuData);\n    }\n\n    this._closingActionsSubscription = this._menuClosingActions().subscribe(() => this.closeMenu());\n    this._initMenu();\n\n    if (this.menu instanceof _MatMenuBase) {\n      this.menu._startAnimation();\n    }\n  }\n\n  /** Closes the menu. */\n  closeMenu(): void {\n    this.menu.close.emit();\n  }\n\n  /**\n   * Focuses the menu trigger.\n   * @param origin Source of the menu trigger's focus.\n   */\n  focus(origin?: FocusOrigin, options?: FocusOptions) {\n    if (this._focusMonitor && origin) {\n      this._focusMonitor.focusVia(this._element, origin, options);\n    } else {\n      this._element.nativeElement.focus(options);\n    }\n  }\n\n  /** Closes the menu and does the necessary cleanup. */\n  private _destroyMenu(reason: MenuCloseReason) {\n    if (!this._overlayRef || !this.menuOpen) {\n      return;\n    }\n\n    const menu = this.menu;\n    this._closingActionsSubscription.unsubscribe();\n    this._overlayRef.detach();\n\n    // Always restore focus if the user is navigating using the keyboard or the menu was opened\n    // programmatically. We don't restore for non-root triggers, because it can prevent focus\n    // from making it back to the root trigger when closing a long chain of menus by clicking\n    // on the backdrop.\n    if (this.restoreFocus && (reason === 'keydown' || !this._openedBy || !this.triggersSubmenu())) {\n      this.focus(this._openedBy);\n    }\n\n    this._openedBy = undefined;\n\n    if (menu instanceof _MatMenuBase) {\n      menu._resetAnimation();\n\n      if (menu.lazyContent) {\n        // Wait for the exit animation to finish before detaching the content.\n        menu._animationDone\n          .pipe(\n            filter(event => event.toState === 'void'),\n            take(1),\n            // Interrupt if the content got re-attached.\n            takeUntil(menu.lazyContent._attached)\n          )\n          .subscribe({\n            next: () => menu.lazyContent!.detach(),\n            // No matter whether the content got re-attached, reset the menu.\n            complete: () => this._setIsMenuOpen(false)\n          });\n      } else {\n        this._setIsMenuOpen(false);\n      }\n    } else {\n      this._setIsMenuOpen(false);\n\n      if (menu.lazyContent) {\n        menu.lazyContent.detach();\n      }\n    }\n  }\n\n  /**\n   * This method sets the menu state to open and focuses the first item if\n   * the menu was opened via the keyboard.\n   */\n  private _initMenu(): void {\n    this.menu.parentMenu = this.triggersSubmenu() ? this._parentMaterialMenu : undefined;\n    this.menu.direction = this.dir;\n    this._setMenuElevation();\n    this.menu.focusFirstItem(this._openedBy || 'program');\n    this._setIsMenuOpen(true);\n  }\n\n  /** Updates the menu elevation based on the amount of parent menus that it has. */\n  private _setMenuElevation(): void {\n    if (this.menu.setElevation) {\n      let depth = 0;\n      let parentMenu = this.menu.parentMenu;\n\n      while (parentMenu) {\n        depth++;\n        parentMenu = parentMenu.parentMenu;\n      }\n\n      this.menu.setElevation(depth);\n    }\n  }\n\n  // set state rather than toggle to support triggers sharing a menu\n  private _setIsMenuOpen(isOpen: boolean): void {\n    this._menuOpen = isOpen;\n    this._menuOpen ? this.menuOpened.emit() : this.menuClosed.emit();\n\n    if (this.triggersSubmenu()) {\n      this._menuItemInstance._highlighted = isOpen;\n    }\n  }\n\n  /**\n   * This method checks that a valid instance of MatMenu has been passed into\n   * matMenuTriggerFor. If not, an exception is thrown.\n   */\n  private _checkMenu() {\n    if (!this.menu && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throwMatMenuMissingError();\n    }\n  }\n\n  /**\n   * This method creates the overlay from the provided menu's template and saves its\n   * OverlayRef so that it can be attached to the DOM when openMenu is called.\n   */\n  private _createOverlay(): OverlayRef {\n    if (!this._overlayRef) {\n      const config = this._getOverlayConfig();\n      this._subscribeToPositions(config.positionStrategy as FlexibleConnectedPositionStrategy);\n      this._overlayRef = this._overlay.create(config);\n\n      // Consume the `keydownEvents` in order to prevent them from going to another overlay.\n      // Ideally we'd also have our keyboard event logic in here, however doing so will\n      // break anybody that may have implemented the `MatMenuPanel` themselves.\n      this._overlayRef.keydownEvents().subscribe();\n    }\n\n    return this._overlayRef;\n  }\n\n  /**\n   * This method builds the configuration object needed to create the overlay, the OverlayState.\n   * @returns OverlayConfig\n   */\n  private _getOverlayConfig(): OverlayConfig {\n    return new OverlayConfig({\n      positionStrategy: this._overlay.position()\n          .flexibleConnectedTo(this._element)\n          .withLockedPosition()\n          .withGrowAfterOpen()\n          .withTransformOriginOn('.mat-menu-panel, .mat-mdc-menu-panel'),\n      backdropClass: this.menu.backdropClass || 'cdk-overlay-transparent-backdrop',\n      panelClass: this.menu.overlayPanelClass,\n      scrollStrategy: this._scrollStrategy(),\n      direction: this._dir\n    });\n  }\n\n  /**\n   * Listens to changes in the position of the overlay and sets the correct classes\n   * on the menu based on the new position. This ensures the animation origin is always\n   * correct, even if a fallback position is used for the overlay.\n   */\n  private _subscribeToPositions(position: FlexibleConnectedPositionStrategy): void {\n    if (this.menu.setPositionClasses) {\n      position.positionChanges.subscribe(change => {\n        const posX: MenuPositionX = change.connectionPair.overlayX === 'start' ? 'after' : 'before';\n        const posY: MenuPositionY = change.connectionPair.overlayY === 'top' ? 'below' : 'above';\n\n        this.menu.setPositionClasses!(posX, posY);\n      });\n    }\n  }\n\n  /**\n   * Sets the appropriate positions on a position strategy\n   * so the overlay connects with the trigger correctly.\n   * @param positionStrategy Strategy whose position to update.\n   */\n  private _setPosition(positionStrategy: FlexibleConnectedPositionStrategy) {\n    let [originX, originFallbackX]: HorizontalConnectionPos[] =\n        this.menu.xPosition === 'before' ? ['end', 'start'] : ['start', 'end'];\n\n    let [overlayY, overlayFallbackY]: VerticalConnectionPos[] =\n        this.menu.yPosition === 'above' ? ['bottom', 'top'] : ['top', 'bottom'];\n\n    let [originY, originFallbackY] = [overlayY, overlayFallbackY];\n    let [overlayX, overlayFallbackX] = [originX, originFallbackX];\n    let offsetY = 0;\n\n    if (this.triggersSubmenu()) {\n      // When the menu is a sub-menu, it should always align itself\n      // to the edges of the trigger, instead of overlapping it.\n      overlayFallbackX = originX = this.menu.xPosition === 'before' ? 'start' : 'end';\n      originFallbackX = overlayX = originX === 'end' ? 'start' : 'end';\n      offsetY = overlayY === 'bottom' ? MENU_PANEL_TOP_PADDING : -MENU_PANEL_TOP_PADDING;\n    } else if (!this.menu.overlapTrigger) {\n      originY = overlayY === 'top' ? 'bottom' : 'top';\n      originFallbackY = overlayFallbackY === 'top' ? 'bottom' : 'top';\n    }\n\n    positionStrategy.withPositions([\n      {originX, originY, overlayX, overlayY, offsetY},\n      {originX: originFallbackX, originY, overlayX: overlayFallbackX, overlayY, offsetY},\n      {\n        originX,\n        originY: originFallbackY,\n        overlayX,\n        overlayY: overlayFallbackY,\n        offsetY: -offsetY\n      },\n      {\n        originX: originFallbackX,\n        originY: originFallbackY,\n        overlayX: overlayFallbackX,\n        overlayY: overlayFallbackY,\n        offsetY: -offsetY\n      }\n    ]);\n  }\n\n  /** Returns a stream that emits whenever an action that should close the menu occurs. */\n  private _menuClosingActions() {\n    const backdrop = this._overlayRef!.backdropClick();\n    const detachments = this._overlayRef!.detachments();\n    const parentClose = this._parentMaterialMenu ? this._parentMaterialMenu.closed : observableOf();\n    const hover = this._parentMaterialMenu ? this._parentMaterialMenu._hovered().pipe(\n      filter(active => active !== this._menuItemInstance),\n      filter(() => this._menuOpen)\n    ) : observableOf();\n\n    return merge(backdrop, parentClose, hover, detachments);\n  }\n\n  /** Handles mouse presses on the trigger. */\n  _handleMousedown(event: MouseEvent): void {\n    if (!isFakeMousedownFromScreenReader(event)) {\n      // Since right or middle button clicks won't trigger the `click` event,\n      // we shouldn't consider the menu as opened by mouse in those cases.\n      this._openedBy = event.button === 0 ? 'mouse' : undefined;\n\n      // Since clicking on the trigger won't close the menu if it opens a sub-menu,\n      // we should prevent focus from moving onto it via click to avoid the\n      // highlight from lingering on the menu item.\n      if (this.triggersSubmenu()) {\n        event.preventDefault();\n      }\n    }\n  }\n\n  /** Handles key presses on the trigger. */\n  _handleKeydown(event: KeyboardEvent): void {\n    const keyCode = event.keyCode;\n\n    // Pressing enter on the trigger will trigger the click handler later.\n    if (keyCode === ENTER || keyCode === SPACE) {\n      this._openedBy = 'keyboard';\n    }\n\n    if (this.triggersSubmenu() && (\n            (keyCode === RIGHT_ARROW && this.dir === 'ltr') ||\n            (keyCode === LEFT_ARROW && this.dir === 'rtl'))) {\n      this._openedBy = 'keyboard';\n      this.openMenu();\n    }\n  }\n\n  /** Handles click events on the trigger. */\n  _handleClick(event: MouseEvent): void {\n    if (this.triggersSubmenu()) {\n      // Stop event propagation to avoid closing the parent menu.\n      event.stopPropagation();\n      this.openMenu();\n    } else {\n      this.toggleMenu();\n    }\n  }\n\n  /** Handles the cases where the user hovers over the trigger. */\n  private _handleHover() {\n    // Subscribe to changes in the hovered item in order to toggle the panel.\n    if (!this.triggersSubmenu() || !this._parentMaterialMenu) {\n      return;\n    }\n\n    this._hoverSubscription = this._parentMaterialMenu._hovered()\n      // Since we might have multiple competing triggers for the same menu (e.g. a sub-menu\n      // with different data and triggers), we have to delay it by a tick to ensure that\n      // it won't be closed immediately after it is opened.\n      .pipe(\n        filter(active => active === this._menuItemInstance && !active.disabled),\n        delay(0, asapScheduler)\n      )\n      .subscribe(() => {\n        this._openedBy = 'mouse';\n\n        // If the same menu is used between multiple triggers, it might still be animating\n        // while the new trigger tries to re-open it. Wait for the animation to finish\n        // before doing so. Also interrupt if the user moves to another item.\n        if (this.menu instanceof _MatMenuBase && this.menu._isAnimating) {\n          // We need the `delay(0)` here in order to avoid\n          // 'changed after checked' errors in some cases. See #12194.\n          this.menu._animationDone\n            .pipe(take(1), delay(0, asapScheduler), takeUntil(this._parentMaterialMenu!._hovered()))\n            .subscribe(() => this.openMenu());\n        } else {\n          this.openMenu();\n        }\n      });\n  }\n\n  /** Gets the portal that should be attached to the overlay. */\n  private _getPortal(): TemplatePortal {\n    // Note that we can avoid this check by keeping the portal on the menu panel.\n    // While it would be cleaner, we'd have to introduce another required method on\n    // `MatMenuPanel`, making it harder to consume.\n    if (!this._portal || this._portal.templateRef !== this.menu.templateRef) {\n      this._portal = new TemplatePortal(this.menu.templateRef, this._viewContainerRef);\n    }\n\n    return this._portal;\n  }\n\n}\n"]}