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Allow touch scroll to be default prevented by making the handlers passive #423

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merged 9 commits into from
Apr 4, 2019
Merged

Allow touch scroll to be default prevented by making the handlers passive #423

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0d3a5f6
Allow touch scroll to be default prevented by making the handlers pas…
pradeepnschrodinger Apr 3, 2019
a86b63f
Uncomment and remove lines
pradeepnschrodinger Apr 3, 2019
fb83c2b
Typo in componentWillUnmount
pradeepnschrodinger Apr 3, 2019
803faaf
Added flag 'stopScrollDefaultHandling' to control preventDefault beha…
pradeepnschrodinger Apr 4, 2019
6db0796
Added issue reference
pradeepnschrodinger Apr 4, 2019
4127040
Add and fix tests
pradeepnschrodinger Apr 4, 2019
07a376f
Add prevent default calls in onTouchStart and onTouchEnd
pradeepnschrodinger Apr 4, 2019
44a1411
The flags now need to be booleans
pradeepnschrodinger Apr 4, 2019
3499535
Fix tests: Remove test cases where the flags were functions
pradeepnschrodinger Apr 4, 2019
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2 changes: 1 addition & 1 deletion examples/TouchScrollExample.js
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ class TouchScrollExample extends React.Component {
// scrolling of parent containers of FDT. This style is a work around to fix this. By applying 'none' to
// touch-action, we are disabling touch events from propagating.
const tableParentStyle = {
'touch-action': 'none'
'touchAction': 'none'
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Typo.. It worked anyway, so I guess React was being lenient.

};

return (
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13 changes: 12 additions & 1 deletion src/FixedDataTable.js
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Expand Up @@ -456,11 +456,18 @@ class FixedDataTable extends React.Component {
}

componentWillUnmount() {
// TODO (pradeep): Remove these and pass to our table component directly after
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Here's the related issue if you want to reference it:
facebook/react#6436

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thanks, will put.

// React provides an API where event handlers can be specified to be non-passive
this._divRef && this._divRef.removeEventListener(
'wheel',
this._wheelHandler.onWheel,
{ passive: false }
);
this._divRef && this._divRef.addEventListener(
'touchmove',
this._touchHandler.onTouchMove,
{ passive: false }
);
this._wheelHandler = null;
this._touchHandler = null;

Expand Down Expand Up @@ -576,6 +583,11 @@ class FixedDataTable extends React.Component {
this._wheelHandler.onWheel,
{ passive: false }
);
this._divRef && this._divRef.addEventListener(
'touchmove',
this._touchHandler.onTouchMove,
{ passive: false }
);
this._reportContentHeight();
}

Expand Down Expand Up @@ -798,7 +810,6 @@ class FixedDataTable extends React.Component {
onKeyDown={this._onKeyDown}
onTouchStart={this._touchHandler.onTouchStart}
onTouchEnd={this._touchHandler.onTouchEnd}
onTouchMove={this._touchHandler.onTouchMove}
onTouchCancel={this._touchHandler.onTouchCancel}
ref={this._onRef}
style={{
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3 changes: 1 addition & 2 deletions src/ReactTouchHandler.js
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Expand Up @@ -148,6 +148,7 @@ class ReactTouchHandler {
}

onTouchMove(/*object*/ event) {
event.preventDefault();
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if the delta is zero, preventDefault wasn't being called. This is why the parent container / page get's scrolled
when the table is at any start/end scroll position

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Will this lead to the issue where you can't scroll the parent page with your pointer over the grid?

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@wcjordan , Yes exactly. My reasoning was that I wouldn't want to scroll any container if the cursor is on the table. But now I agree, that it's better to have a FF control this instead (#419 (comment)). Will add


var moveX = event.touches[0].pageX;
var moveY = event.touches[0].pageY;
Expand Down Expand Up @@ -175,8 +176,6 @@ class ReactTouchHandler {
this._deltaY = 0;
}

event.preventDefault();

// Ensure minimum delta magnitude is met to avoid jitter
var changed = false;
if (Math.abs(this._deltaX) > 2 || Math.abs(this._deltaY) > 2) {
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3 changes: 2 additions & 1 deletion src/vendor_upstream/dom/ReactWheelHandler.js
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Expand Up @@ -64,6 +64,8 @@ class ReactWheelHandler {
}

onWheel(/*object*/ event) {
event.preventDefault();
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Will this lead to the issue where you can't scroll the parent page with your pointer over the grid?

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Yep, same as above.


var normalizedEvent = normalizeWheel(event);

// if shift is held, swap the axis of scrolling.
Expand All @@ -85,7 +87,6 @@ class ReactWheelHandler {

this._deltaX += handleScrollX ? normalizedEvent.pixelX : 0;
this._deltaY += handleScrollY ? normalizedEvent.pixelY : 0;
event.preventDefault();

var changed;
if (this._deltaX !== 0 || this._deltaY !== 0) {
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