57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
/**
|
|
* Copyright (c) Meta Platforms, Inc. and affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
* @flow strict
|
|
* @format
|
|
*/
|
|
|
|
import Platform from '../Utilities/Platform';
|
|
|
|
let isEnabled = false;
|
|
|
|
if (Platform.OS === 'web') {
|
|
const canUseDOM = Boolean(
|
|
typeof window !== 'undefined' &&
|
|
window.document &&
|
|
window.document.createElement,
|
|
);
|
|
|
|
if (canUseDOM) {
|
|
/**
|
|
* Web browsers emulate mouse events (and hover states) after touch events.
|
|
* This code infers when the currently-in-use modality supports hover
|
|
* (including for multi-modality devices) and considers "hover" to be enabled
|
|
* if a mouse movement occurs more than 1 second after the last touch event.
|
|
* This threshold is long enough to account for longer delays between the
|
|
* browser firing touch and mouse events on low-powered devices.
|
|
*/
|
|
const HOVER_THRESHOLD_MS = 1000;
|
|
let lastTouchTimestamp = 0;
|
|
|
|
const enableHover = () => {
|
|
if (isEnabled || Date.now() - lastTouchTimestamp < HOVER_THRESHOLD_MS) {
|
|
return;
|
|
}
|
|
isEnabled = true;
|
|
};
|
|
|
|
const disableHover = () => {
|
|
lastTouchTimestamp = Date.now();
|
|
if (isEnabled) {
|
|
isEnabled = false;
|
|
}
|
|
};
|
|
|
|
document.addEventListener('touchstart', disableHover, true);
|
|
document.addEventListener('touchmove', disableHover, true);
|
|
document.addEventListener('mousemove', enableHover, true);
|
|
}
|
|
}
|
|
|
|
export function isHoverEnabled(): boolean {
|
|
return isEnabled;
|
|
}
|