void
InputBlockState::UpdateTargetApzc(const RefPtr<AsyncPanZoomController>& aTargetApzc)
{
// note that aTargetApzc MAY be null here.
mTargetApzc = aTargetApzc;
mTransformToApzc = aTargetApzc ? aTargetApzc->GetTransformToThis() : ScreenToParentLayerMatrix4x4();
mOverscrollHandoffChain = (mTargetApzc ? mTargetApzc->BuildOverscrollHandoffChain() : nullptr);
}
// A simple hit testing test that doesn't involve any transforms on layers.
TEST_F(APZHitTestingTester, HitTesting1) {
CreateHitTesting1LayerTree();
ScopedLayerTreeRegistration registration(manager, 0, root, mcc);
// No APZC attached so hit testing will return no APZC at (20,20)
RefPtr<AsyncPanZoomController> hit = GetTargetAPZC(ScreenPoint(20, 20));
TestAsyncPanZoomController* nullAPZC = nullptr;
EXPECT_EQ(nullAPZC, hit.get());
EXPECT_EQ(ScreenToParentLayerMatrix4x4(), transformToApzc);
EXPECT_EQ(ParentLayerToScreenMatrix4x4(), transformToGecko);
uint32_t paintSequenceNumber = 0;
// Now we have a root APZC that will match the page
SetScrollableFrameMetrics(root, FrameMetrics::START_SCROLL_ID);
manager->UpdateHitTestingTree(nullptr, root, false, 0, paintSequenceNumber++);
hit = GetTargetAPZC(ScreenPoint(15, 15));
EXPECT_EQ(ApzcOf(root), hit.get());
// expect hit point at LayerIntPoint(15, 15)
EXPECT_EQ(ParentLayerPoint(15, 15), transformToApzc * ScreenPoint(15, 15));
EXPECT_EQ(ScreenPoint(15, 15), transformToGecko * ParentLayerPoint(15, 15));
// Now we have a sub APZC with a better fit
SetScrollableFrameMetrics(layers[3], FrameMetrics::START_SCROLL_ID + 1);
manager->UpdateHitTestingTree(nullptr, root, false, 0, paintSequenceNumber++);
EXPECT_NE(ApzcOf(root), ApzcOf(layers[3]));
hit = GetTargetAPZC(ScreenPoint(25, 25));
EXPECT_EQ(ApzcOf(layers[3]), hit.get());
// expect hit point at LayerIntPoint(25, 25)
EXPECT_EQ(ParentLayerPoint(25, 25), transformToApzc * ScreenPoint(25, 25));
EXPECT_EQ(ScreenPoint(25, 25), transformToGecko * ParentLayerPoint(25, 25));
// At this point, layers[4] obscures layers[3] at the point (15, 15) so
// hitting there should hit the root APZC
hit = GetTargetAPZC(ScreenPoint(15, 15));
EXPECT_EQ(ApzcOf(root), hit.get());
// Now test hit testing when we have two scrollable layers
SetScrollableFrameMetrics(layers[4], FrameMetrics::START_SCROLL_ID + 2);
manager->UpdateHitTestingTree(nullptr, root, false, 0, paintSequenceNumber++);
hit = GetTargetAPZC(ScreenPoint(15, 15));
EXPECT_EQ(ApzcOf(layers[4]), hit.get());
// expect hit point at LayerIntPoint(15, 15)
EXPECT_EQ(ParentLayerPoint(15, 15), transformToApzc * ScreenPoint(15, 15));
EXPECT_EQ(ScreenPoint(15, 15), transformToGecko * ParentLayerPoint(15, 15));
// Hit test ouside the reach of layer[3,4] but inside root
hit = GetTargetAPZC(ScreenPoint(90, 90));
EXPECT_EQ(ApzcOf(root), hit.get());
// expect hit point at LayerIntPoint(90, 90)
EXPECT_EQ(ParentLayerPoint(90, 90), transformToApzc * ScreenPoint(90, 90));
EXPECT_EQ(ScreenPoint(90, 90), transformToGecko * ParentLayerPoint(90, 90));
// Hit test ouside the reach of any layer
hit = GetTargetAPZC(ScreenPoint(1000, 10));
EXPECT_EQ(nullAPZC, hit.get());
EXPECT_EQ(ScreenToParentLayerMatrix4x4(), transformToApzc);
EXPECT_EQ(ParentLayerToScreenMatrix4x4(), transformToGecko);
hit = GetTargetAPZC(ScreenPoint(-1000, 10));
EXPECT_EQ(nullAPZC, hit.get());
EXPECT_EQ(ScreenToParentLayerMatrix4x4(), transformToApzc);
EXPECT_EQ(ParentLayerToScreenMatrix4x4(), transformToGecko);
}
