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menu.mjs
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import * as i0 from '@angular/core';
import { InjectionToken, inject, ElementRef, ChangeDetectorRef, booleanAttribute, Component, ChangeDetectionStrategy, ViewEncapsulation, Input, TemplateRef, ApplicationRef, Injector, ViewContainerRef, Directive, QueryList, EventEmitter, afterNextRender, ContentChildren, ViewChild, ContentChild, Output, NgZone, NgModule } from '@angular/core';
import { FocusMonitor, FocusKeyManager, isFakeTouchstartFromScreenReader, isFakeMousedownFromScreenReader } from '@angular/cdk/a11y';
import { UP_ARROW, DOWN_ARROW, RIGHT_ARROW, LEFT_ARROW, ESCAPE, hasModifierKey, ENTER, SPACE } from '@angular/cdk/keycodes';
import { Subject, merge, Subscription, of, asapScheduler } from 'rxjs';
import { startWith, switchMap, takeUntil, filter, take, delay } from 'rxjs/operators';
import { DOCUMENT } from '@angular/common';
import { _StructuralStylesLoader, MatRipple, MatRippleModule, MatCommonModule } from '@angular/material/core';
import { _CdkPrivateStyleLoader } from '@angular/cdk/private';
import { TemplatePortal, DomPortalOutlet } from '@angular/cdk/portal';
import { trigger, state, style, transition, animate } from '@angular/animations';
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';
/**
* Injection token used to provide the parent menu to menu-specific components.
* @docs-private
*/
const MAT_MENU_PANEL = new InjectionToken('MAT_MENU_PANEL');
/**
* Single item inside a `mat-menu`. Provides the menu item styling and accessibility treatment.
*/
class MatMenuItem {
constructor() {
this._elementRef = inject(ElementRef);
this._document = inject(DOCUMENT);
this._focusMonitor = inject(FocusMonitor);
this._parentMenu = inject(MAT_MENU_PANEL, { optional: true });
this._changeDetectorRef = inject(ChangeDetectorRef);
/** ARIA role for the menu item. */
this.role = 'menuitem';
/** Whether the menu item is disabled. */
this.disabled = false;
/** Whether ripples are disabled on the menu item. */
this.disableRipple = false;
/** 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;
inject(_CdkPrivateStyleLoader).load(_StructuralStylesLoader);
this._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. */
_checkDisabled(event) {
if (this.disabled) {
event.preventDefault();
event.stopPropagation();
}
}
/** Emits to the hover stream. */
_handleMouseEnter() {
this._hovered.next(this);
}
/** Gets the label to be used when determining whether the option should be focused. */
getLabel() {
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++) {
icons[i].remove();
}
return clone.textContent?.trim() || '';
}
_setHighlighted(isHighlighted) {
// 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.
this._highlighted = isHighlighted;
this._changeDetectorRef.markForCheck();
}
_setTriggersSubmenu(triggersSubmenu) {
this._triggersSubmenu = triggersSubmenu;
this._changeDetectorRef.markForCheck();
}
_hasFocus() {
return this._document && this._document.activeElement === this._getHostElement();
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "19.0.0-next.10", ngImport: i0, type: MatMenuItem, deps: [], target: i0.ɵɵFactoryTarget.Component }); }
static { this.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "17.0.0", version: "19.0.0-next.10", type: MatMenuItem, isStandalone: true, selector: "[mat-menu-item]", inputs: { role: "role", disabled: ["disabled", "disabled", booleanAttribute], disableRipple: ["disableRipple", "disableRipple", booleanAttribute] }, host: { listeners: { "click": "_checkDisabled($event)", "mouseenter": "_handleMouseEnter()" }, properties: { "attr.role": "role", "class.mat-mdc-menu-item-highlighted": "_highlighted", "class.mat-mdc-menu-item-submenu-trigger": "_triggersSubmenu", "attr.tabindex": "_getTabIndex()", "attr.aria-disabled": "disabled", "attr.disabled": "disabled || null" }, classAttribute: "mat-mdc-menu-item mat-focus-indicator" }, exportAs: ["matMenuItem"], ngImport: i0, template: "<ng-content select=\"mat-icon, [matMenuItemIcon]\"></ng-content>\n<span class=\"mat-mdc-menu-item-text\"><ng-content></ng-content></span>\n<div class=\"mat-mdc-menu-ripple\" matRipple\n [matRippleDisabled]=\"disableRipple || disabled\"\n [matRippleTrigger]=\"_getHostElement()\">\n</div>\n\n@if (_triggersSubmenu) {\n <svg\n class=\"mat-mdc-menu-submenu-icon\"\n viewBox=\"0 0 5 10\"\n focusable=\"false\"\n aria-hidden=\"true\"><polygon points=\"0,0 5,5 0,10\"/></svg>\n}\n", dependencies: [{ kind: "directive", type: MatRipple, selector: "[mat-ripple], [matRipple]", inputs: ["matRippleColor", "matRippleUnbounded", "matRippleCentered", "matRippleRadius", "matRippleAnimation", "matRippleDisabled", "matRippleTrigger"], exportAs: ["matRipple"] }], changeDetection: i0.ChangeDetectionStrategy.OnPush, encapsulation: i0.ViewEncapsulation.None }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "19.0.0-next.10", ngImport: i0, type: MatMenuItem, decorators: [{
type: Component,
args: [{ selector: '[mat-menu-item]', exportAs: 'matMenuItem', host: {
'[attr.role]': 'role',
'class': 'mat-mdc-menu-item mat-focus-indicator',
'[class.mat-mdc-menu-item-highlighted]': '_highlighted',
'[class.mat-mdc-menu-item-submenu-trigger]': '_triggersSubmenu',
'[attr.tabindex]': '_getTabIndex()',
'[attr.aria-disabled]': 'disabled',
'[attr.disabled]': 'disabled || null',
'(click)': '_checkDisabled($event)',
'(mouseenter)': '_handleMouseEnter()',
}, changeDetection: ChangeDetectionStrategy.OnPush, encapsulation: ViewEncapsulation.None, imports: [MatRipple], template: "<ng-content select=\"mat-icon, [matMenuItemIcon]\"></ng-content>\n<span class=\"mat-mdc-menu-item-text\"><ng-content></ng-content></span>\n<div class=\"mat-mdc-menu-ripple\" matRipple\n [matRippleDisabled]=\"disableRipple || disabled\"\n [matRippleTrigger]=\"_getHostElement()\">\n</div>\n\n@if (_triggersSubmenu) {\n <svg\n class=\"mat-mdc-menu-submenu-icon\"\n viewBox=\"0 0 5 10\"\n focusable=\"false\"\n aria-hidden=\"true\"><polygon points=\"0,0 5,5 0,10\"/></svg>\n}\n" }]
}], ctorParameters: () => [], propDecorators: { role: [{
type: Input
}], disabled: [{
type: Input,
args: [{ transform: booleanAttribute }]
}], disableRipple: [{
type: Input,
args: [{ transform: booleanAttribute }]
}] } });
/**
* 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.`);
}
/**
* 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');
/** Menu content that will be rendered lazily once the menu is opened. */
class MatMenuContent {
constructor() {
this._template = inject(TemplateRef);
this._appRef = inject(ApplicationRef);
this._injector = inject(Injector);
this._viewContainerRef = inject(ViewContainerRef);
this._document = inject(DOCUMENT);
this._changeDetectorRef = inject(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'), null, 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`.
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();
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "19.0.0-next.10", ngImport: i0, type: MatMenuContent, deps: [], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "19.0.0-next.10", type: MatMenuContent, isStandalone: true, selector: "ng-template[matMenuContent]", providers: [{ provide: MAT_MENU_CONTENT, useExisting: MatMenuContent }], ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "19.0.0-next.10", ngImport: i0, type: MatMenuContent, decorators: [{
type: Directive,
args: [{
selector: 'ng-template[matMenuContent]',
providers: [{ provide: MAT_MENU_CONTENT, useExisting: MatMenuContent }],
}]
}], ctorParameters: () => [] });
/**
* 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;
let menuPanelUid = 0;
/** 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',
};
}
class MatMenu {
/** 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();
}
/**
* 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;
const newClassList = { ...this._classList };
if (previousPanelClass && previousPanelClass.length) {
previousPanelClass.split(' ').forEach((className) => {
newClassList[className] = false;
});
}
this._previousPanelClass = classes;
if (classes && classes.length) {
classes.split(' ').forEach((className) => {
newClassList[className] = true;
});
this._elementRef.nativeElement.className = '';
}
this._classList = newClassList;
}
/**
* 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;
}
constructor() {
this._elementRef = inject(ElementRef);
this._changeDetectorRef = inject(ChangeDetectorRef);
this._elevationPrefix = 'mat-elevation-z';
this._baseElevation = null;
/** Only the direct descendant menu items. */
this._directDescendantItems = new QueryList();
/** Classes to be applied to the menu panel. */
this._classList = {};
/** Current state of the panel animation. */
this._panelAnimationState = 'void';
/** Emits whenever an animation on the menu completes. */
this._animationDone = new Subject();
/** 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++}`;
this._injector = inject(Injector);
const defaultOptions = inject(MAT_MENU_DEFAULT_OPTIONS);
this.overlayPanelClass = defaultOptions.overlayPanelClass || '';
this._xPosition = defaultOptions.xPosition;
this._yPosition = defaultOptions.yPosition;
this.backdropClass = defaultOptions.backdropClass;
this.overlapTrigger = defaultOptions.overlapTrigger;
this.hasBackdrop = defaultOptions.hasBackdrop;
}
ngOnInit() {
this.setPositionClasses();
}
ngAfterContentInit() {
this._updateDirectDescendants();
this._keyManager = new FocusKeyManager(this._directDescendantItems)
.withWrap()
.withTypeAhead()
.withHomeAndEnd();
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));
this._directDescendantItems.changes.subscribe((itemsList) => {
// Move focus to another item, if the active item is removed from the list.
// We need to debounce the callback, because multiple items might be removed
// in quick succession.
const manager = this._keyManager;
if (this._panelAnimationState === 'enter' && manager.activeItem?._hasFocus()) {
const items = itemsList.toArray();
const index = Math.max(0, Math.min(items.length - 1, manager.activeItemIndex || 0));
if (items[index] && !items[index].disabled) {
manager.setActiveItem(index);
}
else {
manager.setNextItemActive();
}
}
});
}
ngOnDestroy() {
this._keyManager?.destroy();
this._directDescendantItems.destroy();
this.closed.complete();
this._firstItemFocusRef?.destroy();
}
/** 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);
return;
}
// Don't allow the event to propagate if we've already handled it, or it may
// end up reaching other overlays that were opened earlier (see #22694).
event.stopPropagation();
}
/**
* Focus the first item in the menu.
* @param origin Action from which the focus originated. Used to set the correct styling.
*/
focusFirstItem(origin = 'program') {
// Wait for `afterNextRender` to ensure iOS VoiceOver screen reader focuses the first item (#24735).
this._firstItemFocusRef?.destroy();
this._firstItemFocusRef = afterNextRender(() => {
let menuPanel = null;
if (this._directDescendantItems.length) {
// Because the `mat-menuPanel` is at the DOM insertion point, not inside the overlay, we don't
// have a nice way of getting a hold of the menuPanel 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.
menuPanel = this._directDescendantItems.first._getHostElement().closest('[role="menu"]');
}
// If an item in the menuPanel is already focused, avoid overriding the focus.
if (!menuPanel || !menuPanel.contains(document.activeElement)) {
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 menuPanel panel so keyboard events like Escape still work. Also this will
// give _some_ feedback to screen readers.
if (!manager.activeItem && menuPanel) {
menuPanel.focus();
}
}
}, { injector: this._injector });
}
/**
* 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 base elevation depends on which version of the spec
// we're running so we have to resolve it at runtime.
if (this._baseElevation === null) {
const styles = typeof getComputedStyle === 'function'
? getComputedStyle(this._elementRef.nativeElement)
: null;
const value = styles?.getPropertyValue('--mat-menu-base-elevation-level') || '8';
this._baseElevation = parseInt(value);
}
// 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) {
const newClassList = { ...this._classList };
if (this._previousElevation) {
newClassList[this._previousElevation] = false;
}
newClassList[newElevation] = true;
this._previousElevation = newElevation;
this._classList = newClassList;
}
}
/**
* 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) {
this._classList = {
...this._classList,
['mat-menu-before']: posX === 'before',
['mat-menu-after']: posX === 'after',
['mat-menu-above']: posY === 'above',
['mat-menu-below']: posY === 'below',
};
this._changeDetectorRef.markForCheck();
}
/** 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();
});
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "19.0.0-next.10", ngImport: i0, type: MatMenu, deps: [], target: i0.ɵɵFactoryTarget.Component }); }
static { this.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "16.1.0", version: "19.0.0-next.10", type: MatMenu, isStandalone: true, selector: "mat-menu", inputs: { backdropClass: "backdropClass", ariaLabel: ["aria-label", "ariaLabel"], ariaLabelledby: ["aria-labelledby", "ariaLabelledby"], ariaDescribedby: ["aria-describedby", "ariaDescribedby"], xPosition: "xPosition", yPosition: "yPosition", overlapTrigger: ["overlapTrigger", "overlapTrigger", booleanAttribute], hasBackdrop: ["hasBackdrop", "hasBackdrop", (value) => (value == null ? null : booleanAttribute(value))], panelClass: ["class", "panelClass"], classList: "classList" }, outputs: { closed: "closed", close: "close" }, host: { properties: { "attr.aria-label": "null", "attr.aria-labelledby": "null", "attr.aria-describedby": "null" } }, providers: [{ provide: MAT_MENU_PANEL, useExisting: MatMenu }], queries: [{ propertyName: "lazyContent", first: true, predicate: MAT_MENU_CONTENT, descendants: true }, { propertyName: "_allItems", predicate: MatMenuItem, descendants: true }, { propertyName: "items", predicate: MatMenuItem }], viewQueries: [{ propertyName: "templateRef", first: true, predicate: TemplateRef, descendants: true }], exportAs: ["matMenu"], ngImport: i0, template: "<ng-template>\n <div\n class=\"mat-mdc-menu-panel mat-mdc-elevation-specific\"\n [id]=\"panelId\"\n [class]=\"_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-mdc-menu-content\">\n <ng-content></ng-content>\n </div>\n </div>\n</ng-template>\n", styles: ["mat-menu{display:none}.mat-mdc-menu-content{margin:0;padding:8px 0;outline:0}.mat-mdc-menu-content,.mat-mdc-menu-content .mat-mdc-menu-item .mat-mdc-menu-item-text{-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased;flex:1;white-space:normal;font-family:var(--mat-menu-item-label-text-font, var(--mat-sys-label-large-font));line-height:var(--mat-menu-item-label-text-line-height, var(--mat-sys-label-large-line-height));font-size:var(--mat-menu-item-label-text-size, var(--mat-sys-label-large-size));letter-spacing:var(--mat-menu-item-label-text-tracking, var(--mat-sys-label-large-tracking));font-weight:var(--mat-menu-item-label-text-weight, var(--mat-sys-label-large-weight))}.mat-mdc-menu-panel{min-width:112px;max-width:280px;overflow:auto;-webkit-overflow-scrolling:touch;box-sizing:border-box;outline:0;border-radius:var(--mat-menu-container-shape, var(--mat-sys-corner-extra-small));background-color:var(--mat-menu-container-color, var(--mat-sys-surface-container));will-change:transform,opacity}.mat-mdc-menu-panel.ng-animating{pointer-events:none}.mat-mdc-menu-panel.ng-animating:has(.mat-mdc-menu-content:empty){display:none}@media(forced-colors: active){.mat-mdc-menu-panel{outline:solid 1px}}.mat-mdc-menu-panel .mat-divider{color:var(--mat-menu-divider-color, var(--mat-sys-surface-variant));margin-bottom:var(--mat-menu-divider-bottom-spacing, 8px);margin-top:var(--mat-menu-divider-top-spacing, 8px)}.mat-mdc-menu-item{display:flex;position:relative;align-items:center;justify-content:flex-start;overflow:hidden;padding:0;cursor:pointer;width:100%;text-align:left;box-sizing:border-box;color:inherit;font-size:inherit;background:none;text-decoration:none;margin:0;min-height:48px;padding-left:var(--mat-menu-item-leading-spacing, 12px);padding-right:var(--mat-menu-item-trailing-spacing, 12px);-webkit-user-select:none;user-select:none;cursor:pointer;outline:none;border:none;-webkit-tap-highlight-color:rgba(0,0,0,0)}.mat-mdc-menu-item::-moz-focus-inner{border:0}[dir=rtl] .mat-mdc-menu-item{padding-left:var(--mat-menu-item-trailing-spacing, 12px);padding-right:var(--mat-menu-item-leading-spacing, 12px)}.mat-mdc-menu-item:has(.material-icons,mat-icon,[matButtonIcon]){padding-left:var(--mat-menu-item-with-icon-leading-spacing, 12px);padding-right:var(--mat-menu-item-with-icon-trailing-spacing, 12px)}[dir=rtl] .mat-mdc-menu-item:has(.material-icons,mat-icon,[matButtonIcon]){padding-left:var(--mat-menu-item-with-icon-trailing-spacing, 12px);padding-right:var(--mat-menu-item-with-icon-leading-spacing, 12px)}.mat-mdc-menu-item,.mat-mdc-menu-item:visited,.mat-mdc-menu-item:link{color:var(--mat-menu-item-label-text-color, var(--mat-sys-on-surface))}.mat-mdc-menu-item .mat-icon-no-color,.mat-mdc-menu-item .mat-mdc-menu-submenu-icon{color:var(--mat-menu-item-icon-color, var(--mat-sys-on-surface-variant))}.mat-mdc-menu-item[disabled]{cursor:default;opacity:.38}.mat-mdc-menu-item[disabled]::after{display:block;position:absolute;content:\"\";top:0;left:0;bottom:0;right:0}.mat-mdc-menu-item:focus{outline:0}.mat-mdc-menu-item .mat-icon{flex-shrink:0;margin-right:var(--mat-menu-item-spacing, 12px);height:var(--mat-menu-item-icon-size, 24px);width:var(--mat-menu-item-icon-size, 24px)}[dir=rtl] .mat-mdc-menu-item{text-align:right}[dir=rtl] .mat-mdc-menu-item .mat-icon{margin-right:0;margin-left:var(--mat-menu-item-spacing, 12px)}.mat-mdc-menu-item:not([disabled]):hover{background-color:var(--mat-menu-item-hover-state-layer-color, color-mix(in srgb, var(--mat-sys-on-surface) calc(var(--mat-sys-hover-state-layer-opacity) * 100%), transparent))}.mat-mdc-menu-item:not([disabled]).cdk-program-focused,.mat-mdc-menu-item:not([disabled]).cdk-keyboard-focused,.mat-mdc-menu-item:not([disabled]).mat-mdc-menu-item-highlighted{background-color:var(--mat-menu-item-focus-state-layer-color, color-mix(in srgb, var(--mat-sys-on-surface) calc(var(--mat-sys-focus-state-layer-opacity) * 100%), transparent))}@media(forced-colors: active){.mat-mdc-menu-item{margin-top:1px}}.mat-mdc-menu-submenu-icon{width:var(--mat-menu-item-icon-size, 24px);height:10px;fill:currentColor;padding-left:var(--mat-menu-item-spacing, 12px)}[dir=rtl] .mat-mdc-menu-submenu-icon{padding-right:var(--mat-menu-item-spacing, 12px);padding-left:0}[dir=rtl] .mat-mdc-menu-submenu-icon polygon{transform:scaleX(-1);transform-origin:center}@media(forced-colors: active){.mat-mdc-menu-submenu-icon{fill:CanvasText}}.mat-mdc-menu-item .mat-mdc-menu-ripple{top:0;left:0;right:0;bottom:0;position:absolute;pointer-events:none}"], animations: [matMenuAnimations.transformMenu, matMenuAnimations.fadeInItems], changeDetection: i0.ChangeDetectionStrategy.OnPush, encapsulation: i0.ViewEncapsulation.None }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "19.0.0-next.10", ngImport: i0, type: MatMenu, decorators: [{
type: Component,
args: [{ selector: 'mat-menu', 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 }], template: "<ng-template>\n <div\n class=\"mat-mdc-menu-panel mat-mdc-elevation-specific\"\n [id]=\"panelId\"\n [class]=\"_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-mdc-menu-content\">\n <ng-content></ng-content>\n </div>\n </div>\n</ng-template>\n", styles: ["mat-menu{display:none}.mat-mdc-menu-content{margin:0;padding:8px 0;outline:0}.mat-mdc-menu-content,.mat-mdc-menu-content .mat-mdc-menu-item .mat-mdc-menu-item-text{-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased;flex:1;white-space:normal;font-family:var(--mat-menu-item-label-text-font, var(--mat-sys-label-large-font));line-height:var(--mat-menu-item-label-text-line-height, var(--mat-sys-label-large-line-height));font-size:var(--mat-menu-item-label-text-size, var(--mat-sys-label-large-size));letter-spacing:var(--mat-menu-item-label-text-tracking, var(--mat-sys-label-large-tracking));font-weight:var(--mat-menu-item-label-text-weight, var(--mat-sys-label-large-weight))}.mat-mdc-menu-panel{min-width:112px;max-width:280px;overflow:auto;-webkit-overflow-scrolling:touch;box-sizing:border-box;outline:0;border-radius:var(--mat-menu-container-shape, var(--mat-sys-corner-extra-small));background-color:var(--mat-menu-container-color, var(--mat-sys-surface-container));will-change:transform,opacity}.mat-mdc-menu-panel.ng-animating{pointer-events:none}.mat-mdc-menu-panel.ng-animating:has(.mat-mdc-menu-content:empty){display:none}@media(forced-colors: active){.mat-mdc-menu-panel{outline:solid 1px}}.mat-mdc-menu-panel .mat-divider{color:var(--mat-menu-divider-color, var(--mat-sys-surface-variant));margin-bottom:var(--mat-menu-divider-bottom-spacing, 8px);margin-top:var(--mat-menu-divider-top-spacing, 8px)}.mat-mdc-menu-item{display:flex;position:relative;align-items:center;justify-content:flex-start;overflow:hidden;padding:0;cursor:pointer;width:100%;text-align:left;box-sizing:border-box;color:inherit;font-size:inherit;background:none;text-decoration:none;margin:0;min-height:48px;padding-left:var(--mat-menu-item-leading-spacing, 12px);padding-right:var(--mat-menu-item-trailing-spacing, 12px);-webkit-user-select:none;user-select:none;cursor:pointer;outline:none;border:none;-webkit-tap-highlight-color:rgba(0,0,0,0)}.mat-mdc-menu-item::-moz-focus-inner{border:0}[dir=rtl] .mat-mdc-menu-item{padding-left:var(--mat-menu-item-trailing-spacing, 12px);padding-right:var(--mat-menu-item-leading-spacing, 12px)}.mat-mdc-menu-item:has(.material-icons,mat-icon,[matButtonIcon]){padding-left:var(--mat-menu-item-with-icon-leading-spacing, 12px);padding-right:var(--mat-menu-item-with-icon-trailing-spacing, 12px)}[dir=rtl] .mat-mdc-menu-item:has(.material-icons,mat-icon,[matButtonIcon]){padding-left:var(--mat-menu-item-with-icon-trailing-spacing, 12px);padding-right:var(--mat-menu-item-with-icon-leading-spacing, 12px)}.mat-mdc-menu-item,.mat-mdc-menu-item:visited,.mat-mdc-menu-item:link{color:var(--mat-menu-item-label-text-color, var(--mat-sys-on-surface))}.mat-mdc-menu-item .mat-icon-no-color,.mat-mdc-menu-item .mat-mdc-menu-submenu-icon{color:var(--mat-menu-item-icon-color, var(--mat-sys-on-surface-variant))}.mat-mdc-menu-item[disabled]{cursor:default;opacity:.38}.mat-mdc-menu-item[disabled]::after{display:block;position:absolute;content:\"\";top:0;left:0;bottom:0;right:0}.mat-mdc-menu-item:focus{outline:0}.mat-mdc-menu-item .mat-icon{flex-shrink:0;margin-right:var(--mat-menu-item-spacing, 12px);height:var(--mat-menu-item-icon-size, 24px);width:var(--mat-menu-item-icon-size, 24px)}[dir=rtl] .mat-mdc-menu-item{text-align:right}[dir=rtl] .mat-mdc-menu-item .mat-icon{margin-right:0;margin-left:var(--mat-menu-item-spacing, 12px)}.mat-mdc-menu-item:not([disabled]):hover{background-color:var(--mat-menu-item-hover-state-layer-color, color-mix(in srgb, var(--mat-sys-on-surface) calc(var(--mat-sys-hover-state-layer-opacity) * 100%), transparent))}.mat-mdc-menu-item:not([disabled]).cdk-program-focused,.mat-mdc-menu-item:not([disabled]).cdk-keyboard-focused,.mat-mdc-menu-item:not([disabled]).mat-mdc-menu-item-highlighted{background-color:var(--mat-menu-item-focus-state-layer-color, color-mix(in srgb, var(--mat-sys-on-surface) calc(var(--mat-sys-focus-state-layer-opacity) * 100%), transparent))}@media(forced-colors: active){.mat-mdc-menu-item{margin-top:1px}}.mat-mdc-menu-submenu-icon{width:var(--mat-menu-item-icon-size, 24px);height:10px;fill:currentColor;padding-left:var(--mat-menu-item-spacing, 12px)}[dir=rtl] .mat-mdc-menu-submenu-icon{padding-right:var(--mat-menu-item-spacing, 12px);padding-left:0}[dir=rtl] .mat-mdc-menu-submenu-icon polygon{transform:scaleX(-1);transform-origin:center}@media(forced-colors: active){.mat-mdc-menu-submenu-icon{fill:CanvasText}}.mat-mdc-menu-item .mat-mdc-menu-ripple{top:0;left:0;right:0;bottom:0;position:absolute;pointer-events:none}"] }]
}], ctorParameters: () => [], 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,
args: [{ transform: booleanAttribute }]
}], hasBackdrop: [{
type: Input,
args: [{ transform: (value) => (value == null ? null : booleanAttribute(value)) }]
}], panelClass: [{
type: Input,
args: ['class']
}], classList: [{
type: Input
}], closed: [{
type: Output
}], close: [{
type: Output
}] } });
/** Injection token that determines the scroll handling while the menu is open. */
const MAT_MENU_SCROLL_STRATEGY = new InjectionToken('mat-menu-scroll-strategy', {
providedIn: 'root',
factory: () => {
const overlay = inject(Overlay);
return () => overlay.scrollStrategies.reposition();
},
});
/** @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,
};
/** Options for binding a passive event listener. */
const passiveEventListenerOptions = normalizePassiveListenerOptions({ passive: true });
/**
* Default top padding of the menu panel.
* @deprecated No longer being used. Will be removed.
* @breaking-change 15.0.0
*/
const MENU_PANEL_TOP_PADDING = 8;
/** Directive applied to an element that should trigger a `mat-menu`. */
class MatMenuTrigger {
/**
* @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);
}
});
}
this._menuItemInstance?._setTriggersSubmenu(this.triggersSubmenu());
}
constructor() {
this._overlay = inject(Overlay);
this._element = inject(ElementRef);
this._viewContainerRef = inject(ViewContainerRef);
this._menuItemInstance = inject(MatMenuItem, { optional: true, self: true });
this._dir = inject(Directionality, { optional: true });
this._focusMonitor = inject(FocusMonitor);
this._ngZone = inject(NgZone);
this._scrollStrategy = inject(MAT_MENU_SCROLL_STRATEGY);
this._changeDetectorRef = inject(ChangeDetectorRef);
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;
const parentMenu = inject(MAT_MENU_PANEL, { optional: true });
this._parentMaterialMenu = parentMenu instanceof MatMenu ? parentMenu : undefined;
this._element.nativeElement.addEventListener('touchstart', this._handleTouchStart, passiveEventListenerOptions);
}
ngAfterContentInit() {
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 && this.menu);
}
/** Toggles the menu between the open and closed states. */
toggleMenu() {
return this._menuOpen ? this.closeMenu() : this.openMenu();
}
/** Opens the menu. */
openMenu() {
const menu = this.menu;
if (this._menuOpen || !menu) {
return;
}
const overlayRef = this._createOverlay(menu);
const overlayConfig = overlayRef.getConfig();
const positionStrategy = overlayConfig.positionStrategy;
this._setPosition(menu, positionStrategy);
overlayConfig.hasBackdrop =
menu.hasBackdrop == null ? !this.triggersSubmenu() : menu.hasBackdrop;
overlayRef.attach(this._getPortal(menu));
if (menu.lazyContent) {
menu.lazyContent.attach(this.menuData);
}
this._closingActionsSubscription = this._menuClosingActions().subscribe(() => this.closeMenu());
this._initMenu(menu);
if (menu instanceof MatMenu) {
menu._startAnimation();
menu._directDescendantItems.changes.pipe(takeUntil(menu.close)).subscribe(() => {
// Re-adjust the position without locking when the amount of items
// changes so that the overlay is allowed to pick a new optimal position.
positionStrategy.withLockedPosition(false).reapplyLastPosition();
positionStrategy.withLockedPosition(true);
});
}
}
/** 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() {
this._overlayRef?.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 MatMenu) {
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);
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(menu) {
menu.parentMenu = this.triggersSubmenu() ? this._parentMaterialMenu : undefined;
menu.direction = this.dir;
this._setMenuElevation(menu);
menu.focusFirstItem(this._openedBy || 'program');
this._setIsMenuOpen(true);
}
/** Updates the menu elevation based on the amount of parent menus that it has. */
_setMenuElevation(menu) {
if (menu.setElevation) {
let depth = 0;
let parentMenu = menu.parentMenu;
while (parentMenu) {
depth++;
parentMenu = parentMenu.parentMenu;
}
menu.setElevation(depth);
}
}
// set state rather than toggle to support triggers sharing a menu
_setIsMenuOpen(isOpen) {
if (isOpen !== this._menuOpen) {
this._menuOpen = isOpen;
this._menuOpen ? this.menuOpened.emit() : this.menuClosed.emit();
if (this.triggersSubmenu()) {
this._menuItemInstance._setHighlighted(isOpen);
}
this._changeDetectorRef.markForCheck();
}
}
/**
* 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(menu) {
if (!this._overlayRef) {
const config = this._getOverlayConfig(menu);
this._subscribeToPositions(menu, 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(menu) {
return new OverlayConfig({
positionStrategy: this._overlay
.position()
.flexibleConnectedTo(this._element)
.withLockedPosition()
.withGrowAfterOpen()
.withTransformOriginOn('.mat-menu-panel, .mat-mdc-menu-panel'),
backdropClass: menu.backdropClass || 'cdk-overlay-transparent-backdrop',
panelClass: menu.overlayPanelClass,
scrollStrategy: this._scrollStrategy(),
direction: this._dir || 'ltr',
});
}
/**
* 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(menu, position) {
if (menu.setPositionClasses) {
position.positionChanges.subscribe(change => {
this._ngZone.run(() => {
const posX = change.connectionPair.overlayX === 'start' ? 'after' : 'before';
const posY = change.connectionPair.overlayY === 'top' ? 'below' : 'above';
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(menu, positionStrategy) {
let [originX, originFallbackX] = menu.xPosition === 'before' ? ['end', 'start'] : ['start', 'end'];
let [overlayY, overlayFallbackY] = menu.yPosition === 'above' ? ['bottom', 'top'] : ['top', 'bottom'];