void
HitTestingTreeNode::SetApzcParent(AsyncPanZoomController* aParent)
{
// precondition: GetApzc() is non-null
MOZ_ASSERT(GetApzc() != nullptr);
if (IsPrimaryHolder()) {
GetApzc()->SetParent(aParent);
} else {
MOZ_ASSERT(GetApzc()->GetParent() == aParent);
}
}
HitTestResult
HitTestingTreeNode::HitTest(const ParentLayerPoint& aPoint) const
{
// This should only ever get called if the point is inside the clip region
// for this node.
MOZ_ASSERT(!IsOutsideClip(aPoint));
// When event regions are disabled and we have an APZC on this node, we are
// actually storing the touch-sensitive section of the composition bounds in
// the clip region, and we don't need to check against the mEventRegions.
// If there's no APZC, then we do need to check against the mEventRegions
// (which contains the layer's visible region) for obscuration purposes.
if (!gfxPrefs::LayoutEventRegionsEnabled() && GetApzc()) {
return HitTestResult::HitLayer;
}
// convert into Layer coordinate space
Maybe<LayerPoint> pointInLayerPixels = Untransform(aPoint);
if (!pointInLayerPixels) {
return HitTestResult::HitNothing;
}
LayerIntPoint point = RoundedToInt(pointInLayerPixels.ref());
// test against event regions in Layer coordinate space
if (!mEventRegions.mHitRegion.Contains(point.x, point.y)) {
return HitTestResult::HitNothing;
}
if (mForceDispatchToContent ||
mEventRegions.mDispatchToContentHitRegion.Contains(point.x, point.y))
{
return HitTestResult::HitDispatchToContentRegion;
}
return HitTestResult::HitLayer;
}
void
HitTestingTreeNode::MakeRoot()
{
mParent = nullptr;
if (GetApzc()) {
SetApzcParent(nullptr);
}
}
