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Add safeguard to handleTouchMove

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This commit is contained in:
Sampo Osmonen
2020-03-09 19:37:21 +02:00
parent 831c5f8c69
commit 85d84a0c40
1 changed files with 2 additions and 1 deletions
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src/ol/MapBrowserEventHandler.js
+2 -1
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@@ -275,7 +275,8 @@ class MapBrowserEventHandler extends EventTarget {
* @private * @private
*/ */
handleTouchMove_(event) { handleTouchMove_(event) {
if (this.originalPointerMoveEvent_.defaultPrevented) { // In some environments (such as iOS 12), this handler can get called once before the `originalPointerMoveEvent_` is initialized. This prevents crashes in those situations (but may not work correctly if `originalPointerMoveEvent_` lags behind the current event?).
if (this.originalPointerMoveEvent_ && this.originalPointerMoveEvent_.defaultPrevented) {
event.preventDefault(); event.preventDefault();
} }
} }