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@angular/cdk

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Angular Material Component Development Kit

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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 { Directive, ElementRef, inject, NgZone } from '@angular/core'; import { Directionality } from '@angular/cdk/bidi'; import { Overlay, OverlayConfig, STANDARD_DROPDOWN_ADJACENT_POSITIONS, STANDARD_DROPDOWN_BELOW_POSITIONS, } from '@angular/cdk/overlay'; import { DOWN_ARROW, ENTER, hasModifierKey, LEFT_ARROW, RIGHT_ARROW, SPACE, UP_ARROW, } from '@angular/cdk/keycodes'; import { _getEventTarget } from '@angular/cdk/platform'; import { InputModalityDetector } from '@angular/cdk/a11y'; import { fromEvent } from 'rxjs'; import { filter, takeUntil } from 'rxjs/operators'; import { CDK_MENU } from './menu-interface'; import { PARENT_OR_NEW_MENU_STACK_PROVIDER } from './menu-stack'; import { MENU_AIM } from './menu-aim'; import { CdkMenuTriggerBase, MENU_TRIGGER } from './menu-trigger-base'; import * as i0 from "@angular/core"; /** * A directive that turns its host element into a trigger for a popup menu. * It can be combined with cdkMenuItem to create sub-menus. If the element is in a top level * MenuBar it will open the menu on click, or if a sibling is already opened it will open on hover. * If it is inside of a Menu it will open the attached Submenu on hover regardless of its sibling * state. */ class CdkMenuTrigger extends CdkMenuTriggerBase { constructor() { super(); this._elementRef = inject(ElementRef); this._overlay = inject(Overlay); this._ngZone = inject(NgZone); this._directionality = inject(Directionality, { optional: true }); this._inputModalityDetector = inject(InputModalityDetector); /** The parent menu this trigger belongs to. */ this._parentMenu = inject(CDK_MENU, { optional: true }); /** The menu aim service used by this menu. */ this._menuAim = inject(MENU_AIM, { optional: true }); this._setRole(); this._registerCloseHandler(); this._subscribeToMenuStackClosed(); this._subscribeToMouseEnter(); this._subscribeToMenuStackHasFocus(); this._setType(); } /** Toggle the attached menu. */ toggle() { this.isOpen() ? this.close() : this.open(); } /** Open the attached menu. */ open() { if (!this.isOpen() && this.menuTemplateRef != null) { this.opened.next(); this.overlayRef = this.overlayRef || this._overlay.create(this._getOverlayConfig()); this.overlayRef.attach(this.getMenuContentPortal()); this._subscribeToOutsideClicks(); } } /** Close the opened menu. */ close() { if (this.isOpen()) { this.closed.next(); this.overlayRef.detach(); } this._closeSiblingTriggers(); } /** * Get a reference to the rendered Menu if the Menu is open and rendered in the DOM. */ getMenu() { return this.childMenu; } /** * Handles keyboard events for the menu item. * @param event The keyboard event to handle */ _toggleOnKeydown(event) { const isParentVertical = this._parentMenu?.orientation === 'vertical'; switch (event.keyCode) { case SPACE: case ENTER: if (!hasModifierKey(event)) { this.toggle(); this.childMenu?.focusFirstItem('keyboard'); } break; case RIGHT_ARROW: if (!hasModifierKey(event)) { if (this._parentMenu && isParentVertical && this._directionality?.value !== 'rtl') { event.preventDefault(); this.open(); this.childMenu?.focusFirstItem('keyboard'); } } break; case LEFT_ARROW: if (!hasModifierKey(event)) { if (this._parentMenu && isParentVertical && this._directionality?.value === 'rtl') { event.preventDefault(); this.open(); this.childMenu?.focusFirstItem('keyboard'); } } break; case DOWN_ARROW: case UP_ARROW: if (!hasModifierKey(event)) { if (!isParentVertical) { event.preventDefault(); this.open(); event.keyCode === DOWN_ARROW ? this.childMenu?.focusFirstItem('keyboard') : this.childMenu?.focusLastItem('keyboard'); } } break; } } /** Handles clicks on the menu trigger. */ _handleClick() { // Don't handle clicks originating from the keyboard since we // already do the same on `keydown` events for enter and space. if (this._inputModalityDetector.mostRecentModality !== 'keyboard') { this.toggle(); this.childMenu?.focusFirstItem('mouse'); } } /** * Sets whether the trigger's menu stack has focus. * @param hasFocus Whether the menu stack has focus. */ _setHasFocus(hasFocus) { if (!this._parentMenu) { this.menuStack.setHasFocus(hasFocus); } } /** * Subscribe to the mouseenter events and close any sibling menu items if this element is moused * into. */ _subscribeToMouseEnter() { this._ngZone.runOutsideAngular(() => { fromEvent(this._elementRef.nativeElement, 'mouseenter') .pipe(filter(() => !this.menuStack.isEmpty() && !this.isOpen()), takeUntil(this.destroyed)) .subscribe(() => { // Closes any sibling menu items and opens the menu associated with this trigger. const toggleMenus = () => this._ngZone.run(() => { this._closeSiblingTriggers(); this.open(); }); if (this._menuAim) { this._menuAim.toggle(toggleMenus); } else { toggleMenus(); } }); }); } /** Close out any sibling menu trigger menus. */ _closeSiblingTriggers() { if (this._parentMenu) { // If nothing was removed from the stack and the last element is not the parent item // that means that the parent menu is a menu bar since we don't put the menu bar on the // stack const isParentMenuBar = !this.menuStack.closeSubMenuOf(this._parentMenu) && this.menuStack.peek() !== this._parentMenu; if (isParentMenuBar) { this.menuStack.closeAll(); } } else { this.menuStack.closeAll(); } } /** Get the configuration object used to create the overlay. */ _getOverlayConfig() { return new OverlayConfig({ positionStrategy: this._getOverlayPositionStrategy(), scrollStrategy: this._overlay.scrollStrategies.reposition(), direction: this._directionality || undefined, }); } /** Build the position strategy for the overlay which specifies where to place the menu. */ _getOverlayPositionStrategy() { return this._overlay .position() .flexibleConnectedTo(this._elementRef) .withLockedPosition() .withGrowAfterOpen() .withPositions(this._getOverlayPositions()); } /** Get the preferred positions for the opened menu relative to the menu item. */ _getOverlayPositions() { return (this.menuPosition ?? (!this._parentMenu || this._parentMenu.orientation === 'horizontal' ? STANDARD_DROPDOWN_BELOW_POSITIONS : STANDARD_DROPDOWN_ADJACENT_POSITIONS)); } /** * Subscribe to the MenuStack close events if this is a standalone trigger and close out the menu * this triggers when requested. */ _registerCloseHandler() { if (!this._parentMenu) { this.menuStack.closed.pipe(takeUntil(this.destroyed)).subscribe(({ item }) => { if (item === this.childMenu) { this.close(); } }); } } /** * Subscribe to the overlays outside pointer events stream and handle closing out the stack if a * click occurs outside the menus. */ _subscribeToOutsideClicks() { if (this.overlayRef) { this.overlayRef .outsidePointerEvents() .pipe(takeUntil(this.stopOutsideClicksListener)) .subscribe(event => { const target = _getEventTarget(event); const element = this._elementRef.nativeElement; if (target !== element && !element.contains(target)) { if (!this.isElementInsideMenuStack(target)) { this.menuStack.closeAll(); } else { this._closeSiblingTriggers(); } } }); } } /** Subscribe to the MenuStack hasFocus events. */ _subscribeToMenuStackHasFocus() { if (!this._parentMenu) { this.menuStack.hasFocus.pipe(takeUntil(this.destroyed)).subscribe(hasFocus => { if (!hasFocus) { this.menuStack.closeAll(); } }); } } /** Subscribe to the MenuStack closed events. */ _subscribeToMenuStackClosed() { if (!this._parentMenu) { this.menuStack.closed.subscribe(({ focusParentTrigger }) => { if (focusParentTrigger && !this.menuStack.length()) { this._elementRef.nativeElement.focus(); } }); } } /** Sets the role attribute for this trigger if needed. */ _setRole() { // If this trigger is part of another menu, the cdkMenuItem directive will handle setting the // role, otherwise this is a standalone trigger, and we should ensure it has role="button". if (!this._parentMenu) { this._elementRef.nativeElement.setAttribute('role', 'button'); } } /** Sets thte `type` attribute of the trigger. */ _setType() { const element = this._elementRef.nativeElement; if (element.nodeName === 'BUTTON' && !element.getAttribute('type')) { // Prevents form submissions. element.setAttribute('type', 'button'); } } static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: CdkMenuTrigger, deps: [], target: i0.ɵɵFactoryTarget.Directive }); } static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.0.0", type: CdkMenuTrigger, isStandalone: true, selector: "[cdkMenuTriggerFor]", inputs: { menuTemplateRef: ["cdkMenuTriggerFor", "menuTemplateRef"], menuPosition: ["cdkMenuPosition", "menuPosition"], menuData: ["cdkMenuTriggerData", "menuData"] }, outputs: { opened: "cdkMenuOpened", closed: "cdkMenuClosed" }, host: { listeners: { "focusin": "_setHasFocus(true)", "focusout": "_setHasFocus(false)", "keydown": "_toggleOnKeydown($event)", "click": "_handleClick()" }, properties: { "attr.aria-haspopup": "menuTemplateRef ? \"menu\" : null", "attr.aria-expanded": "menuTemplateRef == null ? null : isOpen()" }, classAttribute: "cdk-menu-trigger" }, providers: [ { provide: MENU_TRIGGER, useExisting: CdkMenuTrigger }, PARENT_OR_NEW_MENU_STACK_PROVIDER, ], exportAs: ["cdkMenuTriggerFor"], usesInheritance: true, ngImport: i0 }); } } export { CdkMenuTrigger }; i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: CdkMenuTrigger, decorators: [{ type: Directive, args: [{ selector: '[cdkMenuTriggerFor]', exportAs: 'cdkMenuTriggerFor', standalone: true, host: { 'class': 'cdk-menu-trigger', '[attr.aria-haspopup]': 'menuTemplateRef ? "menu" : null', '[attr.aria-expanded]': 'menuTemplateRef == null ? null : isOpen()', '(focusin)': '_setHasFocus(true)', '(focusout)': '_setHasFocus(false)', '(keydown)': '_toggleOnKeydown($event)', '(click)': '_handleClick()', }, inputs: [ 'menuTemplateRef: cdkMenuTriggerFor', 'menuPosition: cdkMenuPosition', 'menuData: cdkMenuTriggerData', ], outputs: ['opened: cdkMenuOpened', 'closed: cdkMenuClosed'], providers: [ { provide: MENU_TRIGGER, useExisting: CdkMenuTrigger }, PARENT_OR_NEW_MENU_STACK_PROVIDER, ], }] }], ctorParameters: function () { return []; } }); //# 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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 {Directive, ElementRef, inject, NgZone, OnDestroy} from '@angular/core';\nimport {Directionality} from '@angular/cdk/bidi';\nimport {\n  ConnectedPosition,\n  FlexibleConnectedPositionStrategy,\n  Overlay,\n  OverlayConfig,\n  STANDARD_DROPDOWN_ADJACENT_POSITIONS,\n  STANDARD_DROPDOWN_BELOW_POSITIONS,\n} from '@angular/cdk/overlay';\nimport {\n  DOWN_ARROW,\n  ENTER,\n  hasModifierKey,\n  LEFT_ARROW,\n  RIGHT_ARROW,\n  SPACE,\n  UP_ARROW,\n} from '@angular/cdk/keycodes';\nimport {_getEventTarget} from '@angular/cdk/platform';\nimport {InputModalityDetector} from '@angular/cdk/a11y';\nimport {fromEvent} from 'rxjs';\nimport {filter, takeUntil} from 'rxjs/operators';\nimport {CDK_MENU, Menu} from './menu-interface';\nimport {PARENT_OR_NEW_MENU_STACK_PROVIDER} from './menu-stack';\nimport {MENU_AIM} from './menu-aim';\nimport {CdkMenuTriggerBase, MENU_TRIGGER} from './menu-trigger-base';\n\n/**\n * A directive that turns its host element into a trigger for a popup menu.\n * It can be combined with cdkMenuItem to create sub-menus. If the element is in a top level\n * MenuBar it will open the menu on click, or if a sibling is already opened it will open on hover.\n * If it is inside of a Menu it will open the attached Submenu on hover regardless of its sibling\n * state.\n */\n@Directive({\n  selector: '[cdkMenuTriggerFor]',\n  exportAs: 'cdkMenuTriggerFor',\n  standalone: true,\n  host: {\n    'class': 'cdk-menu-trigger',\n    '[attr.aria-haspopup]': 'menuTemplateRef ? \"menu\" : null',\n    '[attr.aria-expanded]': 'menuTemplateRef == null ? null : isOpen()',\n    '(focusin)': '_setHasFocus(true)',\n    '(focusout)': '_setHasFocus(false)',\n    '(keydown)': '_toggleOnKeydown($event)',\n    '(click)': '_handleClick()',\n  },\n  inputs: [\n    'menuTemplateRef: cdkMenuTriggerFor',\n    'menuPosition: cdkMenuPosition',\n    'menuData: cdkMenuTriggerData',\n  ],\n  outputs: ['opened: cdkMenuOpened', 'closed: cdkMenuClosed'],\n  providers: [\n    {provide: MENU_TRIGGER, useExisting: CdkMenuTrigger},\n    PARENT_OR_NEW_MENU_STACK_PROVIDER,\n  ],\n})\nexport class CdkMenuTrigger extends CdkMenuTriggerBase implements OnDestroy {\n  private readonly _elementRef: ElementRef<HTMLElement> = inject(ElementRef);\n  private readonly _overlay = inject(Overlay);\n  private readonly _ngZone = inject(NgZone);\n  private readonly _directionality = inject(Directionality, {optional: true});\n  private readonly _inputModalityDetector = inject(InputModalityDetector);\n\n  /** The parent menu this trigger belongs to. */\n  private readonly _parentMenu = inject(CDK_MENU, {optional: true});\n\n  /** The menu aim service used by this menu. */\n  private readonly _menuAim = inject(MENU_AIM, {optional: true});\n\n  constructor() {\n    super();\n    this._setRole();\n    this._registerCloseHandler();\n    this._subscribeToMenuStackClosed();\n    this._subscribeToMouseEnter();\n    this._subscribeToMenuStackHasFocus();\n    this._setType();\n  }\n\n  /** Toggle the attached menu. */\n  toggle() {\n    this.isOpen() ? this.close() : this.open();\n  }\n\n  /** Open the attached menu. */\n  open() {\n    if (!this.isOpen() && this.menuTemplateRef != null) {\n      this.opened.next();\n\n      this.overlayRef = this.overlayRef || this._overlay.create(this._getOverlayConfig());\n      this.overlayRef.attach(this.getMenuContentPortal());\n      this._subscribeToOutsideClicks();\n    }\n  }\n\n  /** Close the opened menu. */\n  close() {\n    if (this.isOpen()) {\n      this.closed.next();\n\n      this.overlayRef!.detach();\n    }\n    this._closeSiblingTriggers();\n  }\n\n  /**\n   * Get a reference to the rendered Menu if the Menu is open and rendered in the DOM.\n   */\n  getMenu(): Menu | undefined {\n    return this.childMenu;\n  }\n\n  /**\n   * Handles keyboard events for the menu item.\n   * @param event The keyboard event to handle\n   */\n  _toggleOnKeydown(event: KeyboardEvent) {\n    const isParentVertical = this._parentMenu?.orientation === 'vertical';\n    switch (event.keyCode) {\n      case SPACE:\n      case ENTER:\n        if (!hasModifierKey(event)) {\n          this.toggle();\n          this.childMenu?.focusFirstItem('keyboard');\n        }\n        break;\n\n      case RIGHT_ARROW:\n        if (!hasModifierKey(event)) {\n          if (this._parentMenu && isParentVertical && this._directionality?.value !== 'rtl') {\n            event.preventDefault();\n            this.open();\n            this.childMenu?.focusFirstItem('keyboard');\n          }\n        }\n        break;\n\n      case LEFT_ARROW:\n        if (!hasModifierKey(event)) {\n          if (this._parentMenu && isParentVertical && this._directionality?.value === 'rtl') {\n            event.preventDefault();\n            this.open();\n            this.childMenu?.focusFirstItem('keyboard');\n          }\n        }\n        break;\n\n      case DOWN_ARROW:\n      case UP_ARROW:\n        if (!hasModifierKey(event)) {\n          if (!isParentVertical) {\n            event.preventDefault();\n            this.open();\n            event.keyCode === DOWN_ARROW\n              ? this.childMenu?.focusFirstItem('keyboard')\n              : this.childMenu?.focusLastItem('keyboard');\n          }\n        }\n        break;\n    }\n  }\n\n  /** Handles clicks on the menu trigger. */\n  _handleClick() {\n    // Don't handle clicks originating from the keyboard since we\n    // already do the same on `keydown` events for enter and space.\n    if (this._inputModalityDetector.mostRecentModality !== 'keyboard') {\n      this.toggle();\n      this.childMenu?.focusFirstItem('mouse');\n    }\n  }\n\n  /**\n   * Sets whether the trigger's menu stack has focus.\n   * @param hasFocus Whether the menu stack has focus.\n   */\n  _setHasFocus(hasFocus: boolean) {\n    if (!this._parentMenu) {\n      this.menuStack.setHasFocus(hasFocus);\n    }\n  }\n\n  /**\n   * Subscribe to the mouseenter events and close any sibling menu items if this element is moused\n   * into.\n   */\n  private _subscribeToMouseEnter() {\n    this._ngZone.runOutsideAngular(() => {\n      fromEvent(this._elementRef.nativeElement, 'mouseenter')\n        .pipe(\n          filter(() => !this.menuStack.isEmpty() && !this.isOpen()),\n          takeUntil(this.destroyed),\n        )\n        .subscribe(() => {\n          // Closes any sibling menu items and opens the menu associated with this trigger.\n          const toggleMenus = () =>\n            this._ngZone.run(() => {\n              this._closeSiblingTriggers();\n              this.open();\n            });\n\n          if (this._menuAim) {\n            this._menuAim.toggle(toggleMenus);\n          } else {\n            toggleMenus();\n          }\n        });\n    });\n  }\n\n  /** Close out any sibling menu trigger menus. */\n  private _closeSiblingTriggers() {\n    if (this._parentMenu) {\n      // If nothing was removed from the stack and the last element is not the parent item\n      // that means that the parent menu is a menu bar since we don't put the menu bar on the\n      // stack\n      const isParentMenuBar =\n        !this.menuStack.closeSubMenuOf(this._parentMenu) &&\n        this.menuStack.peek() !== this._parentMenu;\n\n      if (isParentMenuBar) {\n        this.menuStack.closeAll();\n      }\n    } else {\n      this.menuStack.closeAll();\n    }\n  }\n\n  /** Get the configuration object used to create the overlay. */\n  private _getOverlayConfig() {\n    return new OverlayConfig({\n      positionStrategy: this._getOverlayPositionStrategy(),\n      scrollStrategy: this._overlay.scrollStrategies.reposition(),\n      direction: this._directionality || undefined,\n    });\n  }\n\n  /** Build the position strategy for the overlay which specifies where to place the menu. */\n  private _getOverlayPositionStrategy(): FlexibleConnectedPositionStrategy {\n    return this._overlay\n      .position()\n      .flexibleConnectedTo(this._elementRef)\n      .withLockedPosition()\n      .withGrowAfterOpen()\n      .withPositions(this._getOverlayPositions());\n  }\n\n  /** Get the preferred positions for the opened menu relative to the menu item. */\n  private _getOverlayPositions(): ConnectedPosition[] {\n    return (\n      this.menuPosition ??\n      (!this._parentMenu || this._parentMenu.orientation === 'horizontal'\n        ? STANDARD_DROPDOWN_BELOW_POSITIONS\n        : STANDARD_DROPDOWN_ADJACENT_POSITIONS)\n    );\n  }\n\n  /**\n   * Subscribe to the MenuStack close events if this is a standalone trigger and close out the menu\n   * this triggers when requested.\n   */\n  private _registerCloseHandler() {\n    if (!this._parentMenu) {\n      this.menuStack.closed.pipe(takeUntil(this.destroyed)).subscribe(({item}) => {\n        if (item === this.childMenu) {\n          this.close();\n        }\n      });\n    }\n  }\n\n  /**\n   * Subscribe to the overlays outside pointer events stream and handle closing out the stack if a\n   * click occurs outside the menus.\n   */\n  private _subscribeToOutsideClicks() {\n    if (this.overlayRef) {\n      this.overlayRef\n        .outsidePointerEvents()\n        .pipe(takeUntil(this.stopOutsideClicksListener))\n        .subscribe(event => {\n          const target = _getEventTarget(event) as Element;\n          const element = this._elementRef.nativeElement;\n\n          if (target !== element && !element.contains(target)) {\n            if (!this.isElementInsideMenuStack(target)) {\n              this.menuStack.closeAll();\n            } else {\n              this._closeSiblingTriggers();\n            }\n          }\n        });\n    }\n  }\n\n  /** Subscribe to the MenuStack hasFocus events. */\n  private _subscribeToMenuStackHasFocus() {\n    if (!this._parentMenu) {\n      this.menuStack.hasFocus.pipe(takeUntil(this.destroyed)).subscribe(hasFocus => {\n        if (!hasFocus) {\n          this.menuStack.closeAll();\n        }\n      });\n    }\n  }\n\n  /** Subscribe to the MenuStack closed events. */\n  private _subscribeToMenuStackClosed() {\n    if (!this._parentMenu) {\n      this.menuStack.closed.subscribe(({focusParentTrigger}) => {\n        if (focusParentTrigger && !this.menuStack.length()) {\n          this._elementRef.nativeElement.focus();\n        }\n      });\n    }\n  }\n\n  /** Sets the role attribute for this trigger if needed. */\n  private _setRole() {\n    // If this trigger is part of another menu, the cdkMenuItem directive will handle setting the\n    // role, otherwise this is a standalone trigger, and we should ensure it has role=\"button\".\n    if (!this._parentMenu) {\n      this._elementRef.nativeElement.setAttribute('role', 'button');\n    }\n  }\n\n  /** Sets thte `type` attribute of the trigger. */\n  private _setType() {\n    const element = this._elementRef.nativeElement;\n\n    if (element.nodeName === 'BUTTON' && !element.getAttribute('type')) {\n      // Prevents form submissions.\n      element.setAttribute('type', 'button');\n    }\n  }\n}\n"]}