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Add comment about pointercancel listener

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tsauerwein
2014-03-14 09:51:04 +01:00
parent b2a37b8244
commit 155b9b3f86
1 changed files with 13 additions and 0 deletions
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13
src/ol/mapbrowserevent.js
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@@ -357,6 +357,19 @@ ol.MapBrowserEventHandler.prototype.handlePointerDown_ =
goog.events.listen(this.documentPointerEventHandler_,
ol.MapBrowserEvent.EventType.POINTERUP,
this.handlePointerUp_, false, this),
/* Note that the listener for `pointercancel is set up on
* `pointerEventHandler_` and not `documentPointerEventHandler_` like
* the `pointerup` and `pointermove` listeners.
*
* The reason for this is the following: `TouchSource.vacuumTouches_()`
* issues `pointercancel` events, when there was no `touchend` for a
* `touchstart`. Now, let's say a first `touchstart` is registered on
* `pointerEventHandler_`. The `documentPointerEventHandler_` is set up.
* But `documentPointerEventHandler_` doesn't know about the first
* `touchstart`. If there is no `touchend` for the `touchstart`, we can
* only receive a `touchcancel` from `pointerEventHandler_`, because it is
* only registered there.
*/
goog.events.listen(this.pointerEventHandler_,
ol.MapBrowserEvent.EventType.POINTERCANCEL,
this.handlePointerUp_, false, this)