TEST_F(APZCSnappingTester, Bug1265510)
{
const char* layerTreeSyntax = "c(t)";
nsIntRegion layerVisibleRegion[] = {
nsIntRegion(IntRect(0, 0, 100, 100)),
nsIntRegion(IntRect(0, 100, 100, 100))
};
root = CreateLayerTree(layerTreeSyntax, layerVisibleRegion, nullptr, lm, layers);
SetScrollableFrameMetrics(root, FrameMetrics::START_SCROLL_ID, CSSRect(0, 0, 100, 200));
SetScrollableFrameMetrics(layers[1], FrameMetrics::START_SCROLL_ID + 1, CSSRect(0, 0, 100, 200));
SetScrollHandoff(layers[1], root);
ScrollSnapInfo snap;
snap.mScrollSnapTypeY = NS_STYLE_SCROLL_SNAP_TYPE_MANDATORY;
snap.mScrollSnapIntervalY = Some(100 * AppUnitsPerCSSPixel());
ScrollMetadata metadata = root->GetScrollMetadata(0);
metadata.SetSnapInfo(ScrollSnapInfo(snap));
root->SetScrollMetadata(metadata);
UniquePtr<ScopedLayerTreeRegistration> registration = MakeUnique<ScopedLayerTreeRegistration>(manager, 0, root, mcc);
manager->UpdateHitTestingTree(nullptr, root, false, 0, 0);
TestAsyncPanZoomController* outer = ApzcOf(layers[0]);
TestAsyncPanZoomController* inner = ApzcOf(layers[1]);
// Position the mouse near the bottom of the outer frame and scroll by 60px.
// (6 lines of 10px each). APZC will actually scroll to y=100 because of the
// mandatory snap coordinate there.
TimeStamp now = mcc->Time();
SmoothWheel(manager, ScreenIntPoint(50, 80), ScreenPoint(0, 6), now);
// Advance in 5ms increments until we've scrolled by 70px. At this point, the
// closest snap point is y=100, and the inner frame should be under the mouse
// cursor.
while (outer->GetCurrentAsyncScrollOffset(AsyncPanZoomController::AsyncMode::NORMAL).y < 70) {
mcc->AdvanceByMillis(5);
outer->AdvanceAnimations(mcc->Time());
}
// Now do another wheel in a new transaction. This should start scrolling the
// inner frame; we verify that it does by checking the inner scroll position.
TimeStamp newTransactionTime = now + TimeDuration::FromMilliseconds(gfxPrefs::MouseWheelTransactionTimeoutMs() + 100);
SmoothWheel(manager, ScreenIntPoint(50, 80), ScreenPoint(0, 6), newTransactionTime);
inner->AdvanceAnimationsUntilEnd();
EXPECT_LT(0.0f, inner->GetCurrentAsyncScrollOffset(AsyncPanZoomController::AsyncMode::NORMAL).y);
// However, the outer frame should also continue to the snap point, otherwise
// it is demonstrating incorrect behaviour by violating the mandatory snapping.
outer->AdvanceAnimationsUntilEnd();
EXPECT_EQ(100.0f, outer->GetCurrentAsyncScrollOffset(AsyncPanZoomController::AsyncMode::NORMAL).y);
}
