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Last change
on this file since e29cc2e was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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| 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 | /** Cached result of whether the user's browser supports passive event listeners. */
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| 9 | let supportsPassiveEvents;
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| 10 | /**
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| 11 | * Checks whether the user's browser supports passive event listeners.
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| 12 | * See: https://github.com/WICG/EventListenerOptions/blob/gh-pages/explainer.md
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| 13 | */
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| 14 | export function supportsPassiveEventListeners() {
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| 15 | if (supportsPassiveEvents == null && typeof window !== 'undefined') {
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| 16 | try {
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| 17 | window.addEventListener('test', null, Object.defineProperty({}, 'passive', {
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| 18 | get: () => supportsPassiveEvents = true
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| 19 | }));
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| 20 | }
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| 21 | finally {
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| 22 | supportsPassiveEvents = supportsPassiveEvents || false;
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| 23 | }
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| 24 | }
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| 25 | return supportsPassiveEvents;
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| 26 | }
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| 27 | /**
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| 28 | * Normalizes an `AddEventListener` object to something that can be passed
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| 29 | * to `addEventListener` on any browser, no matter whether it supports the
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| 30 | * `options` parameter.
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| 31 | * @param options Object to be normalized.
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| 32 | */
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| 33 | export function normalizePassiveListenerOptions(options) {
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| 34 | return supportsPassiveEventListeners() ? options : !!options.capture;
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| 35 | }
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| 36 | //# sourceMappingURL=data:application/json;base64,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 |
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