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Fix InputManager.onTouchMove to work on scrolled-down pages

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`document.elementFromPoint` expects plain viewport coordinates [1],
while we used `page[XY]`, which are viewport coordinates with added
scroll offsets [2].

So on pages where no scrolling had yet occurred,
`InputManager.onTouchMove` worked as expected. But as soon as one
scrolled down/right on the page, the element detection was off by the
scroll offset.

We switch from `page[XY]` to `client[XY]` which are plain viewport
coordinates [3] and thereby make element detection work also on pages
that have been scrolled around.

[1] https://drafts.csswg.org/cssom-view/#dom-document-elementfrompoint
[2] https://w3c.github.io/touch-events/#dom-touch-pagex
[3] https://w3c.github.io/touch-events/#dom-touch-clientx
This commit is contained in:
Christian Aistleitner 2023-11-24 12:49:20 +01:00
parent 47d393ac29
commit 66901b32d3
1 changed files with 1 additions and 1 deletions
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src/input/InputManager.js
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@ -614,7 +614,7 @@ var InputManager = new Class({
if (pointer.active && pointer.identifier === changedTouch.identifier)
{
var element = document.elementFromPoint(changedTouch.pageX, changedTouch.pageY);
var element = document.elementFromPoint(changedTouch.clientX, changedTouch.clientY);
var overCanvas = element === this.canvas;
if (!this.isOver && overCanvas)