@angular/cdk
Version:
Angular Material Component Development Kit
277 lines • 33.5 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, EventEmitter, inject, Input, NgZone, Output, } from '@angular/core';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { InputModalityDetector } from '@angular/cdk/a11y';
import { ENTER, hasModifierKey, LEFT_ARROW, RIGHT_ARROW, SPACE } from '@angular/cdk/keycodes';
import { Directionality } from '@angular/cdk/bidi';
import { fromEvent, Subject } from 'rxjs';
import { filter, takeUntil } from 'rxjs/operators';
import { CdkMenuTrigger } from './menu-trigger';
import { CDK_MENU } from './menu-interface';
import { MENU_STACK } from './menu-stack';
import { MENU_AIM } from './menu-aim';
import * as i0 from "@angular/core";
/**
* Directive which provides the ability for an element to be focused and navigated to using the
* keyboard when residing in a CdkMenu, CdkMenuBar, or CdkMenuGroup. It performs user defined
* behavior when clicked.
*/
export class CdkMenuItem {
/** Whether the CdkMenuItem is disabled - defaults to false */
get disabled() {
return this._disabled;
}
set disabled(value) {
this._disabled = coerceBooleanProperty(value);
}
/** Whether the menu item opens a menu. */
get hasMenu() {
return this._menuTrigger?.menuTemplateRef != null;
}
constructor() {
this._dir = inject(Directionality, { optional: true });
this._inputModalityDetector = inject(InputModalityDetector);
this._elementRef = inject(ElementRef);
this._ngZone = inject(NgZone);
/** The menu aim service used by this menu. */
this._menuAim = inject(MENU_AIM, { optional: true });
/** The stack of menus this menu belongs to. */
this._menuStack = inject(MENU_STACK);
/** The parent menu in which this menuitem resides. */
this._parentMenu = inject(CDK_MENU, { optional: true });
/** Reference to the CdkMenuItemTrigger directive if one is added to the same element */
this._menuTrigger = inject(CdkMenuTrigger, { optional: true, self: true });
this._disabled = false;
/**
* If this MenuItem is a regular MenuItem, outputs when it is triggered by a keyboard or mouse
* event.
*/
this.triggered = new EventEmitter();
/**
* The tabindex for this menu item managed internally and used for implementing roving a
* tab index.
*/
this._tabindex = -1;
/** Whether the item should close the menu if triggered by the spacebar. */
this.closeOnSpacebarTrigger = true;
/** Emits when the menu item is destroyed. */
this.destroyed = new Subject();
this._setupMouseEnter();
this._setType();
if (this._isStandaloneItem()) {
this._tabindex = 0;
}
}
ngOnDestroy() {
this.destroyed.next();
this.destroyed.complete();
}
/** Place focus on the element. */
focus() {
this._elementRef.nativeElement.focus();
}
/**
* If the menu item is not disabled and the element does not have a menu trigger attached, emit
* on the cdkMenuItemTriggered emitter and close all open menus.
* @param options Options the configure how the item is triggered
* - keepOpen: specifies that the menu should be kept open after triggering the item.
*/
trigger(options) {
const { keepOpen } = { ...options };
if (!this.disabled && !this.hasMenu) {
this.triggered.next();
if (!keepOpen) {
this._menuStack.closeAll({ focusParentTrigger: true });
}
}
}
/** Return true if this MenuItem has an attached menu and it is open. */
isMenuOpen() {
return !!this._menuTrigger?.isOpen();
}
/**
* Get a reference to the rendered Menu if the Menu is open and it is visible in the DOM.
* @return the menu if it is open, otherwise undefined.
*/
getMenu() {
return this._menuTrigger?.getMenu();
}
/** Get the CdkMenuTrigger associated with this element. */
getMenuTrigger() {
return this._menuTrigger;
}
/** Get the label for this element which is required by the FocusableOption interface. */
getLabel() {
return this.typeaheadLabel || this._elementRef.nativeElement.textContent?.trim() || '';
}
/** Reset the tabindex to -1. */
_resetTabIndex() {
if (!this._isStandaloneItem()) {
this._tabindex = -1;
}
}
/**
* Set the tab index to 0 if not disabled and it's a focus event, or a mouse enter if this element
* is not in a menu bar.
*/
_setTabIndex(event) {
if (this.disabled) {
return;
}
// don't set the tabindex if there are no open sibling or parent menus
if (!event || !this._menuStack.isEmpty()) {
this._tabindex = 0;
}
}
/**
* Handles keyboard events for the menu item, specifically either triggering the user defined
* callback or opening/closing the current menu based on whether the left or right arrow key was
* pressed.
* @param event the keyboard event to handle
*/
_onKeydown(event) {
switch (event.keyCode) {
case SPACE:
case ENTER:
if (!hasModifierKey(event)) {
this.trigger({ keepOpen: event.keyCode === SPACE && !this.closeOnSpacebarTrigger });
}
break;
case RIGHT_ARROW:
if (!hasModifierKey(event)) {
if (this._parentMenu && this._isParentVertical()) {
if (this._dir?.value !== 'rtl') {
this._forwardArrowPressed(event);
}
else {
this._backArrowPressed(event);
}
}
}
break;
case LEFT_ARROW:
if (!hasModifierKey(event)) {
if (this._parentMenu && this._isParentVertical()) {
if (this._dir?.value !== 'rtl') {
this._backArrowPressed(event);
}
else {
this._forwardArrowPressed(event);
}
}
}
break;
}
}
/** Handles clicks on the menu item. */
_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.trigger();
}
}
/** Whether this menu item is standalone or within a menu or menu bar. */
_isStandaloneItem() {
return !this._parentMenu;
}
/**
* Handles the user pressing the back arrow key.
* @param event The keyboard event.
*/
_backArrowPressed(event) {
const parentMenu = this._parentMenu;
if (this._menuStack.hasInlineMenu() || this._menuStack.length() > 1) {
event.preventDefault();
this._menuStack.close(parentMenu, {
focusNextOnEmpty: this._menuStack.inlineMenuOrientation() === 'horizontal'
? 1 /* FocusNext.previousItem */
: 2 /* FocusNext.currentItem */,
focusParentTrigger: true,
});
}
}
/**
* Handles the user pressing the forward arrow key.
* @param event The keyboard event.
*/
_forwardArrowPressed(event) {
if (!this.hasMenu && this._menuStack.inlineMenuOrientation() === 'horizontal') {
event.preventDefault();
this._menuStack.closeAll({
focusNextOnEmpty: 0 /* FocusNext.nextItem */,
focusParentTrigger: true,
});
}
}
/**
* Subscribe to the mouseenter events and close any sibling menu items if this element is moused
* into.
*/
_setupMouseEnter() {
if (!this._isStandaloneItem()) {
const closeOpenSiblings = () => this._ngZone.run(() => this._menuStack.closeSubMenuOf(this._parentMenu));
this._ngZone.runOutsideAngular(() => fromEvent(this._elementRef.nativeElement, 'mouseenter')
.pipe(filter(() => !this._menuStack.isEmpty() && !this.hasMenu), takeUntil(this.destroyed))
.subscribe(() => {
if (this._menuAim) {
this._menuAim.toggle(closeOpenSiblings);
}
else {
closeOpenSiblings();
}
}));
}
}
/**
* Return true if the enclosing parent menu is configured in a horizontal orientation, false
* otherwise or if no parent.
*/
_isParentVertical() {
return this._parentMenu?.orientation === 'vertical';
}
/** Sets the `type` attribute of the menu item. */
_setType() {
const element = this._elementRef.nativeElement;
if (element.nodeName === 'BUTTON' && !element.getAttribute('type')) {
// Prevent form submissions.
element.setAttribute('type', 'button');
}
}
}
CdkMenuItem.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.0-rc.0", ngImport: i0, type: CdkMenuItem, deps: [], target: i0.ɵɵFactoryTarget.Directive });
CdkMenuItem.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "15.2.0-rc.0", type: CdkMenuItem, isStandalone: true, selector: "[cdkMenuItem]", inputs: { disabled: ["cdkMenuItemDisabled", "disabled"], typeaheadLabel: ["cdkMenuitemTypeaheadLabel", "typeaheadLabel"] }, outputs: { triggered: "cdkMenuItemTriggered" }, host: { attributes: { "role": "menuitem" }, listeners: { "blur": "_resetTabIndex()", "focus": "_setTabIndex()", "click": "_handleClick()", "keydown": "_onKeydown($event)" }, properties: { "tabindex": "_tabindex", "attr.aria-disabled": "disabled || null" }, classAttribute: "cdk-menu-item" }, exportAs: ["cdkMenuItem"], ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.0-rc.0", ngImport: i0, type: CdkMenuItem, decorators: [{
type: Directive,
args: [{
selector: '[cdkMenuItem]',
exportAs: 'cdkMenuItem',
standalone: true,
host: {
'role': 'menuitem',
'class': 'cdk-menu-item',
'[tabindex]': '_tabindex',
'[attr.aria-disabled]': 'disabled || null',
'(blur)': '_resetTabIndex()',
'(focus)': '_setTabIndex()',
'(click)': '_handleClick()',
'(keydown)': '_onKeydown($event)',
},
}]
}], ctorParameters: function () { return []; }, propDecorators: { disabled: [{
type: Input,
args: ['cdkMenuItemDisabled']
}], typeaheadLabel: [{
type: Input,
args: ['cdkMenuitemTypeaheadLabel']
}], triggered: [{
type: Output,
args: ['cdkMenuItemTriggered']
}] } });
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  Directive,\n  ElementRef,\n  EventEmitter,\n  inject,\n  Input,\n  NgZone,\n  OnDestroy,\n  Output,\n} from '@angular/core';\nimport {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {FocusableOption, InputModalityDetector} from '@angular/cdk/a11y';\nimport {ENTER, hasModifierKey, LEFT_ARROW, RIGHT_ARROW, SPACE} from '@angular/cdk/keycodes';\nimport {Directionality} from '@angular/cdk/bidi';\nimport {fromEvent, Subject} from 'rxjs';\nimport {filter, takeUntil} from 'rxjs/operators';\nimport {CdkMenuTrigger} from './menu-trigger';\nimport {CDK_MENU, Menu} from './menu-interface';\nimport {FocusNext, MENU_STACK} from './menu-stack';\nimport {FocusableElement} from './pointer-focus-tracker';\nimport {MENU_AIM, Toggler} from './menu-aim';\n\n/**\n * Directive which provides the ability for an element to be focused and navigated to using the\n * keyboard when residing in a CdkMenu, CdkMenuBar, or CdkMenuGroup. It performs user defined\n * behavior when clicked.\n */\n@Directive({\n  selector: '[cdkMenuItem]',\n  exportAs: 'cdkMenuItem',\n  standalone: true,\n  host: {\n    'role': 'menuitem',\n    'class': 'cdk-menu-item',\n    '[tabindex]': '_tabindex',\n    '[attr.aria-disabled]': 'disabled || null',\n    '(blur)': '_resetTabIndex()',\n    '(focus)': '_setTabIndex()',\n    '(click)': '_handleClick()',\n    '(keydown)': '_onKeydown($event)',\n  },\n})\nexport class CdkMenuItem implements FocusableOption, FocusableElement, Toggler, OnDestroy {\n  protected readonly _dir = inject(Directionality, {optional: true});\n  private readonly _inputModalityDetector = inject(InputModalityDetector);\n  readonly _elementRef: ElementRef<HTMLElement> = inject(ElementRef);\n  protected _ngZone = inject(NgZone);\n\n  /** The menu aim service used by this menu. */\n  private readonly _menuAim = inject(MENU_AIM, {optional: true});\n\n  /** The stack of menus this menu belongs to. */\n  private readonly _menuStack = inject(MENU_STACK);\n\n  /** The parent menu in which this menuitem resides. */\n  private readonly _parentMenu = inject(CDK_MENU, {optional: true});\n\n  /** Reference to the CdkMenuItemTrigger directive if one is added to the same element */\n  private readonly _menuTrigger = inject(CdkMenuTrigger, {optional: true, self: true});\n\n  /**  Whether the CdkMenuItem is disabled - defaults to false */\n  @Input('cdkMenuItemDisabled')\n  get disabled(): boolean {\n    return this._disabled;\n  }\n  set disabled(value: BooleanInput) {\n    this._disabled = coerceBooleanProperty(value);\n  }\n  private _disabled = false;\n\n  /**\n   * The text used to locate this item during menu typeahead. If not specified,\n   * the `textContent` of the item will be used.\n   */\n  @Input('cdkMenuitemTypeaheadLabel') typeaheadLabel: string | null;\n\n  /**\n   * If this MenuItem is a regular MenuItem, outputs when it is triggered by a keyboard or mouse\n   * event.\n   */\n  @Output('cdkMenuItemTriggered') readonly triggered: EventEmitter<void> = new EventEmitter();\n\n  /** Whether the menu item opens a menu. */\n  get hasMenu() {\n    return this._menuTrigger?.menuTemplateRef != null;\n  }\n\n  /**\n   * The tabindex for this menu item managed internally and used for implementing roving a\n   * tab index.\n   */\n  _tabindex: 0 | -1 = -1;\n\n  /** Whether the item should close the menu if triggered by the spacebar. */\n  protected closeOnSpacebarTrigger = true;\n\n  /** Emits when the menu item is destroyed. */\n  protected readonly destroyed = new Subject<void>();\n\n  constructor() {\n    this._setupMouseEnter();\n    this._setType();\n\n    if (this._isStandaloneItem()) {\n      this._tabindex = 0;\n    }\n  }\n\n  ngOnDestroy() {\n    this.destroyed.next();\n    this.destroyed.complete();\n  }\n\n  /** Place focus on the element. */\n  focus() {\n    this._elementRef.nativeElement.focus();\n  }\n\n  /**\n   * If the menu item is not disabled and the element does not have a menu trigger attached, emit\n   * on the cdkMenuItemTriggered emitter and close all open menus.\n   * @param options Options the configure how the item is triggered\n   *   - keepOpen: specifies that the menu should be kept open after triggering the item.\n   */\n  trigger(options?: {keepOpen: boolean}) {\n    const {keepOpen} = {...options};\n    if (!this.disabled && !this.hasMenu) {\n      this.triggered.next();\n      if (!keepOpen) {\n        this._menuStack.closeAll({focusParentTrigger: true});\n      }\n    }\n  }\n\n  /** Return true if this MenuItem has an attached menu and it is open. */\n  isMenuOpen() {\n    return !!this._menuTrigger?.isOpen();\n  }\n\n  /**\n   * Get a reference to the rendered Menu if the Menu is open and it is visible in the DOM.\n   * @return the menu if it is open, otherwise undefined.\n   */\n  getMenu(): Menu | undefined {\n    return this._menuTrigger?.getMenu();\n  }\n\n  /** Get the CdkMenuTrigger associated with this element. */\n  getMenuTrigger(): CdkMenuTrigger | null {\n    return this._menuTrigger;\n  }\n\n  /** Get the label for this element which is required by the FocusableOption interface. */\n  getLabel(): string {\n    return this.typeaheadLabel || this._elementRef.nativeElement.textContent?.trim() || '';\n  }\n\n  /** Reset the tabindex to -1. */\n  _resetTabIndex() {\n    if (!this._isStandaloneItem()) {\n      this._tabindex = -1;\n    }\n  }\n\n  /**\n   * Set the tab index to 0 if not disabled and it's a focus event, or a mouse enter if this element\n   * is not in a menu bar.\n   */\n  _setTabIndex(event?: MouseEvent) {\n    if (this.disabled) {\n      return;\n    }\n\n    // don't set the tabindex if there are no open sibling or parent menus\n    if (!event || !this._menuStack.isEmpty()) {\n      this._tabindex = 0;\n    }\n  }\n\n  /**\n   * Handles keyboard events for the menu item, specifically either triggering the user defined\n   * callback or opening/closing the current menu based on whether the left or right arrow key was\n   * pressed.\n   * @param event the keyboard event to handle\n   */\n  _onKeydown(event: KeyboardEvent) {\n    switch (event.keyCode) {\n      case SPACE:\n      case ENTER:\n        if (!hasModifierKey(event)) {\n          this.trigger({keepOpen: event.keyCode === SPACE && !this.closeOnSpacebarTrigger});\n        }\n        break;\n\n      case RIGHT_ARROW:\n        if (!hasModifierKey(event)) {\n          if (this._parentMenu && this._isParentVertical()) {\n            if (this._dir?.value !== 'rtl') {\n              this._forwardArrowPressed(event);\n            } else {\n              this._backArrowPressed(event);\n            }\n          }\n        }\n        break;\n\n      case LEFT_ARROW:\n        if (!hasModifierKey(event)) {\n          if (this._parentMenu && this._isParentVertical()) {\n            if (this._dir?.value !== 'rtl') {\n              this._backArrowPressed(event);\n            } else {\n              this._forwardArrowPressed(event);\n            }\n          }\n        }\n        break;\n    }\n  }\n\n  /** Handles clicks on the menu item. */\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.trigger();\n    }\n  }\n\n  /** Whether this menu item is standalone or within a menu or menu bar. */\n  private _isStandaloneItem() {\n    return !this._parentMenu;\n  }\n\n  /**\n   * Handles the user pressing the back arrow key.\n   * @param event The keyboard event.\n   */\n  private _backArrowPressed(event: KeyboardEvent) {\n    const parentMenu = this._parentMenu!;\n    if (this._menuStack.hasInlineMenu() || this._menuStack.length() > 1) {\n      event.preventDefault();\n      this._menuStack.close(parentMenu, {\n        focusNextOnEmpty:\n          this._menuStack.inlineMenuOrientation() === 'horizontal'\n            ? FocusNext.previousItem\n            : FocusNext.currentItem,\n        focusParentTrigger: true,\n      });\n    }\n  }\n\n  /**\n   * Handles the user pressing the forward arrow key.\n   * @param event The keyboard event.\n   */\n  private _forwardArrowPressed(event: KeyboardEvent) {\n    if (!this.hasMenu && this._menuStack.inlineMenuOrientation() === 'horizontal') {\n      event.preventDefault();\n      this._menuStack.closeAll({\n        focusNextOnEmpty: FocusNext.nextItem,\n        focusParentTrigger: true,\n      });\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 _setupMouseEnter() {\n    if (!this._isStandaloneItem()) {\n      const closeOpenSiblings = () =>\n        this._ngZone.run(() => this._menuStack.closeSubMenuOf(this._parentMenu!));\n\n      this._ngZone.runOutsideAngular(() =>\n        fromEvent(this._elementRef.nativeElement, 'mouseenter')\n          .pipe(\n            filter(() => !this._menuStack.isEmpty() && !this.hasMenu),\n            takeUntil(this.destroyed),\n          )\n          .subscribe(() => {\n            if (this._menuAim) {\n              this._menuAim.toggle(closeOpenSiblings);\n            } else {\n              closeOpenSiblings();\n            }\n          }),\n      );\n    }\n  }\n\n  /**\n   * Return true if the enclosing parent menu is configured in a horizontal orientation, false\n   * otherwise or if no parent.\n   */\n  private _isParentVertical() {\n    return this._parentMenu?.orientation === 'vertical';\n  }\n\n  /** Sets the `type` attribute of the menu item. */\n  private _setType() {\n    const element = this._elementRef.nativeElement;\n\n    if (element.nodeName === 'BUTTON' && !element.getAttribute('type')) {\n      // Prevent form submissions.\n      element.setAttribute('type', 'button');\n    }\n  }\n}\n"]}