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Make sure that the event position is correct for touch events

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This is a workaround for https://code.google.com/p/closure-library/issues/detail?id=588
This commit is contained in:
Frederic Junod
2013-10-17 12:02:51 +02:00
parent 33f426fd85
commit 92acc3e2d9
1 changed files with 16 additions and 2 deletions
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18
src/ol/map.js
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@@ -446,8 +446,22 @@ ol.Map.prototype.getEventCoordinate = function(event) {
* @return {ol.Pixel} Pixel.
*/
ol.Map.prototype.getEventPixel = function(event) {
var eventPosition = goog.style.getRelativePosition(event, this.viewport_);
return [eventPosition.x, eventPosition.y];
// goog.style.getRelativePosition is based on event.targetTouches,
// but touchend and touchcancel events have no targetTouches when
// the last finger is removed from the screen.
// So we ourselves compute the position of touch events.
// See https://code.google.com/p/closure-library/issues/detail?id=588
if (goog.isDef(event.changedTouches)) {
var touch = event.changedTouches.item(0);
var viewportPosition = goog.style.getClientPosition(this.viewport_);
return [
touch.clientX - viewportPosition.x,
touch.clientY - viewportPosition.y
];
} else {
var eventPosition = goog.style.getRelativePosition(event, this.viewport_);
return [eventPosition.x, eventPosition.y];
}
};