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Merge pull request #372 from abarth/fix_sporadic_crash

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Sporadic crash from invalid touch event
This commit is contained in:
Adam Barth 2015-07-30 11:11:02 -07:00
commit ebfca7db67
1 changed files with 13 additions and 17 deletions
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30
sky/packages/sky/lib/rendering/sky_binding.dart
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@ -102,27 +102,23 @@ class SkyBinding {
return state;
}
PointerState _getOrCreateStateForPointer(event, position) {
PointerState state = _stateForPointer[event.pointer];
if (state == null)
state = _createStateForPointer(event, position);
return state;
}
void _handlePointerEvent(sky.PointerEvent event) {
Point position = new Point(event.x, event.y);
PointerState state;
switch(event.type) {
case 'pointerdown':
state = _createStateForPointer(event, position);
break;
case 'pointerup':
case 'pointercancel':
state = _stateForPointer[event.pointer];
if (_hammingWeight(event.buttons) <= 1)
_stateForPointer.remove(event.pointer);
break;
case 'pointermove':
state = _stateForPointer[event.pointer];
// In the case of mouse hover we won't already have a cached down.
if (state == null)
state = _createStateForPointer(event, position);
break;
PointerState state = _getOrCreateStateForPointer(event, position);
if (event.type == 'pointerup' || event.type == 'pointercancel') {
if (_hammingWeight(event.buttons) <= 1)
_stateForPointer.remove(event.pointer);
}
event.dx = position.x - state.lastPosition.x;
event.dy = position.y - state.lastPosition.y;
state.lastPosition = position;