@angular/cdk
Version:
Angular Material Component Development Kit
307 lines • 39 kB
JavaScript
/**
* @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"]}