| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { DOCUMENT } from '@angular/common';
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| 9 | import { Inject, Injectable } from '@angular/core';
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| 10 | import { BaseOverlayDispatcher } from './base-overlay-dispatcher';
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| 11 | import * as i0 from "@angular/core";
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| 12 | import * as i1 from "@angular/common";
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| 13 | /**
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| 14 | * Service for dispatching keyboard events that land on the body to appropriate overlay ref,
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| 15 | * if any. It maintains a list of attached overlays to determine best suited overlay based
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| 16 | * on event target and order of overlay opens.
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| 17 | */
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| 18 | export class OverlayKeyboardDispatcher extends BaseOverlayDispatcher {
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| 19 | constructor(document) {
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| 20 | super(document);
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| 21 | /** Keyboard event listener that will be attached to the body. */
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| 22 | this._keydownListener = (event) => {
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| 23 | const overlays = this._attachedOverlays;
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| 24 | for (let i = overlays.length - 1; i > -1; i--) {
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| 25 | // Dispatch the keydown event to the top overlay which has subscribers to its keydown events.
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| 26 | // We want to target the most recent overlay, rather than trying to match where the event came
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| 27 | // from, because some components might open an overlay, but keep focus on a trigger element
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| 28 | // (e.g. for select and autocomplete). We skip overlays without keydown event subscriptions,
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| 29 | // because we don't want overlays that don't handle keyboard events to block the ones below
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| 30 | // them that do.
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| 31 | if (overlays[i]._keydownEvents.observers.length > 0) {
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| 32 | overlays[i]._keydownEvents.next(event);
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| 33 | break;
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| 34 | }
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| 35 | }
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| 36 | };
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| 37 | }
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| 38 | /** Add a new overlay to the list of attached overlay refs. */
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| 39 | add(overlayRef) {
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| 40 | super.add(overlayRef);
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| 41 | // Lazily start dispatcher once first overlay is added
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| 42 | if (!this._isAttached) {
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| 43 | this._document.body.addEventListener('keydown', this._keydownListener);
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| 44 | this._isAttached = true;
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| 45 | }
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| 46 | }
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| 47 | /** Detaches the global keyboard event listener. */
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| 48 | detach() {
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| 49 | if (this._isAttached) {
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| 50 | this._document.body.removeEventListener('keydown', this._keydownListener);
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| 51 | this._isAttached = false;
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| 52 | }
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| 53 | }
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| 54 | }
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| 55 | OverlayKeyboardDispatcher.ɵprov = i0.ɵɵdefineInjectable({ factory: function OverlayKeyboardDispatcher_Factory() { return new OverlayKeyboardDispatcher(i0.ɵɵinject(i1.DOCUMENT)); }, token: OverlayKeyboardDispatcher, providedIn: "root" });
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| 56 | OverlayKeyboardDispatcher.decorators = [
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| 57 | { type: Injectable, args: [{ providedIn: 'root' },] }
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| 58 | ];
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| 59 | OverlayKeyboardDispatcher.ctorParameters = () => [
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| 60 | { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
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| 61 | ];
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| 62 | //# 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