// Tests that ending an overscroll animation doesn't leave around state that
// confuses the next overscroll animation.
TEST_F(APZCBasicTester, OverScroll_Bug1152051b) {
SCOPED_GFX_PREF(APZOverscrollEnabled, bool, true);
SCOPED_GFX_PREF(APZOverscrollStopDistanceThreshold, float, 0.1f);
// Pan sufficiently to hit overscroll behavior
PanIntoOverscroll();
// Sample animations once, to give the fling animation started on touch-up
// a chance to realize it's overscrolled, and schedule a call to
// HandleFlingOverscroll().
SampleAnimationOnce();
// This advances the time and runs the HandleFlingOverscroll task scheduled in
// the previous call, which starts an overscroll animation. It then samples
// the overscroll animation once, to get it to initialize the first overscroll
// sample.
SampleAnimationOnce();
// Do a touch-down to cancel the overscroll animation, and then a touch-up
// to schedule a new one since we're still overscrolled. We don't pan because
// panning can trigger functions that clear the overscroll animation state
// in other ways.
TouchDown(apzc, ScreenIntPoint(10, 10), mcc->Time(), nullptr);
TouchUp(apzc, ScreenIntPoint(10, 10), mcc->Time());
// Sample the second overscroll animation to its end.
// If the ending of the first overscroll animation fails to clear state
// properly, this will assert.
ParentLayerPoint expectedScrollOffset(0, GetScrollRange().YMost());
SampleAnimationUntilRecoveredFromOverscroll(expectedScrollOffset);
}
void APZCBasicTester::TestOverscroll()
{
// Pan sufficiently to hit overscroll behavior
PanIntoOverscroll();
// Check that we recover from overscroll via an animation.
ParentLayerPoint expectedScrollOffset(0, GetScrollRange().YMost());
SampleAnimationUntilRecoveredFromOverscroll(expectedScrollOffset);
}
