Marc Wieland
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59 lines
2.9 KiB
TypeScript
59 lines
2.9 KiB
TypeScript
/*
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* Copyright 2022 Adobe. All rights reserved.
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* This file is licensed to you under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under
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* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
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* OF ANY KIND, either express or implied. See the License for the specific language
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* governing permissions and limitations under the License.
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*/
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import {isAndroid} from './platform';
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// Original licensing for the following method can be found in the
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// NOTICE file in the root directory of this source tree.
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// See https://github.com/facebook/react/blob/3c713d513195a53788b3f8bb4b70279d68b15bcc/packages/react-interactions/events/src/dom/shared/index.js#L74-L87
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// Keyboards, Assistive Technologies, and element.click() all produce a "virtual"
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// click event. This is a method of inferring such clicks. Every browser except
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// IE 11 only sets a zero value of "detail" for click events that are "virtual".
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// However, IE 11 uses a zero value for all click events. For IE 11 we rely on
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// the quirk that it produces click events that are of type PointerEvent, and
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// where only the "virtual" click lacks a pointerType field.
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export function isVirtualClick(event: MouseEvent | PointerEvent): boolean {
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// JAWS/NVDA with Firefox.
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if ((event as any).mozInputSource === 0 && event.isTrusted) {
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return true;
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}
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// Android TalkBack's detail value varies depending on the event listener providing the event so we have specific logic here instead
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// If pointerType is defined, event is from a click listener. For events from mousedown listener, detail === 0 is a sufficient check
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// to detect TalkBack virtual clicks.
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if (isAndroid() && (event as PointerEvent).pointerType) {
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return event.type === 'click' && event.buttons === 1;
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}
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return event.detail === 0 && !(event as PointerEvent).pointerType;
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}
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export function isVirtualPointerEvent(event: PointerEvent): boolean {
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// If the pointer size is zero, then we assume it's from a screen reader.
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// Android TalkBack double tap will sometimes return a event with width and height of 1
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// and pointerType === 'mouse' so we need to check for a specific combination of event attributes.
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// Cannot use "event.pressure === 0" as the sole check due to Safari pointer events always returning pressure === 0
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// instead of .5, see https://bugs.webkit.org/show_bug.cgi?id=206216. event.pointerType === 'mouse' is to distingush
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// Talkback double tap from Windows Firefox touch screen press
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return (
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(!isAndroid() && event.width === 0 && event.height === 0) ||
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(event.width === 1 &&
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event.height === 1 &&
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event.pressure === 0 &&
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event.detail === 0 &&
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event.pointerType === 'mouse'
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)
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);
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}
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