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Bug 1175564 - don't lock y-axis if pan displacement is 0. r=kats

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This commit is contained in:
Paul Rouget 2015-06-19 08:37:00 +02:00
parent 33c0d1c104
commit 642c1ce6d5
1 changed files with 7 additions and 3 deletions
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10
gfx/layers/apz/src/AsyncPanZoomController.cpp
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@ -1639,10 +1639,14 @@ nsEventStatus AsyncPanZoomController::OnPanBegin(const PanGestureInput& aEvent)
}
float dx = aEvent.mPanDisplacement.x, dy = aEvent.mPanDisplacement.y;
double angle = atan2(dy, dx); // range [-pi, pi]
angle = fabs(angle); // range [0, pi]
HandlePanning(angle);
if (dx || dy) {
double angle = atan2(dy, dx); // range [-pi, pi]
angle = fabs(angle); // range [0, pi]
HandlePanning(angle);
} else {
SetState(PANNING);
}
return nsEventStatus_eConsumeNoDefault;
}