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[Slider] Improve touch passive event handling #22269

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merged 8 commits into from
Aug 22, 2020
Merged

[Slider] Improve touch passive event handling #22269

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761d3ac
[Slider] Improve touch passive event handling (#13623)
mikhalev-im Aug 18, 2020
bc0f645
avoid warning console
oliviertassinari Aug 18, 2020
8d1db3a
minimize diff
oliviertassinari Aug 19, 2020
5d58d25
not relevant?
oliviertassinari Aug 19, 2020
1d113db
Sebastian review
oliviertassinari Aug 19, 2020
bc397e5
sebatian review
oliviertassinari Aug 21, 2020
3661517
yarn proptypes
oliviertassinari Aug 21, 2020
d32384d
Update packages/material-ui/src/Slider/Slider.js
oliviertassinari Aug 22, 2020
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36 changes: 32 additions & 4 deletions packages/material-ui/src/Slider/Slider.js
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,24 @@ const axisProps = {

const Identity = (x) => x;

// TODO: remove support for Safari < 13.
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Aside: I really need to get an implementation working with pointer events. With those we don't need touchAction: none if I remember correctly.

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Would we need to drop the support of older phones if we move to pointer events?

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I don't know what phones we're supporting. But even our current browserslist would match

// https://caniuse.com/#search=touch-action
//
// Safari, on iOS, supports touch action since v13.
// Over 80% of the iOS phones are compatible
// in August 2020.
let cachedSupportsTouchActionNone;
function doesSupportTouchActionNone() {
if (cachedSupportsTouchActionNone === undefined) {
const element = document.createElement('div');
element.style.touchAction = 'none';
document.body.appendChild(element);
cachedSupportsTouchActionNone = window.getComputedStyle(element).touchAction === 'none';
element.parentElement.removeChild(element);
}
return cachedSupportsTouchActionNone;
}

export const styles = (theme) => ({
/* Styles applied to the root element. */
root: {
Expand All @@ -136,6 +154,7 @@ export const styles = (theme) => ({
display: 'inline-block',
position: 'relative',
cursor: 'pointer',
// Disable scroll capabilities.
touchAction: 'none',
color: theme.palette.primary.main,
WebkitTapHighlightColor: 'transparent',
Expand Down Expand Up @@ -615,8 +634,11 @@ const Slider = React.forwardRef(function Slider(props, ref) {
});

const handleTouchStart = useEventCallback((event) => {
// Workaround as Safari has partial support for touchAction: 'none'.
event.preventDefault();
// If touch-action: none; is not supported we need to prevent the scroll manually.
if (!doesSupportTouchActionNone()) {
event.preventDefault();
}

const touch = event.changedTouches[0];
if (touch != null) {
// A number that uniquely identifies the current finger in the touch session.
Expand All @@ -639,11 +661,17 @@ const Slider = React.forwardRef(function Slider(props, ref) {

React.useEffect(() => {
const { current: slider } = sliderRef;
slider.addEventListener('touchstart', handleTouchStart);
slider.addEventListener('touchstart', handleTouchStart, {
passive: doesSupportTouchActionNone(),
});

const doc = ownerDocument(slider);

return () => {
slider.removeEventListener('touchstart', handleTouchStart);
slider.removeEventListener('touchstart', handleTouchStart, {
passive: doesSupportTouchActionNone(),
});

doc.removeEventListener('mousemove', handleTouchMove);
doc.removeEventListener('mouseup', handleTouchEnd);
doc.removeEventListener('touchmove', handleTouchMove);
Expand Down