Region ScrollingCoordinator::computeNonFastScrollableRegion(const Frame* frame, const IntPoint& frameLocation) const
{
#if ENABLE(IOS_TOUCH_EVENTS)
// On iOS, we use nonFastScrollableRegion to represent the region covered by elements with touch event handlers.
ASSERT(frame->isMainFrame());
UNUSED_PARAM(frameLocation);
Document* document = frame->document();
if (!document)
return Region();
Vector<IntRect> touchRects;
document->getTouchRects(touchRects);
Region touchRegion;
for (const auto& rect : touchRects)
touchRegion.unite(rect);
return touchRegion;
#else
Region nonFastScrollableRegion;
FrameView* frameView = frame->view();
if (!frameView)
return nonFastScrollableRegion;
IntPoint offset = frameLocation;
offset.moveBy(frameView->frameRect().location());
offset.move(0, frameView->topContentInset());
if (const FrameView::ScrollableAreaSet* scrollableAreas = frameView->scrollableAreas()) {
for (FrameView::ScrollableAreaSet::const_iterator it = scrollableAreas->begin(), end = scrollableAreas->end(); it != end; ++it) {
ScrollableArea* scrollableArea = *it;
// Composited scrollable areas can be scrolled off the main thread.
if (scrollableArea->usesCompositedScrolling())
continue;
IntRect box = scrollableArea->scrollableAreaBoundingBox();
box.moveBy(offset);
nonFastScrollableRegion.unite(box);
}
}
for (const auto& child : frameView->children()) {
if (!child->isPluginViewBase())
continue;
PluginViewBase* pluginViewBase = toPluginViewBase(child.get());
if (pluginViewBase->wantsWheelEvents())
nonFastScrollableRegion.unite(pluginViewBase->frameRect());
}
for (Frame* subframe = frame->tree().firstChild(); subframe; subframe = subframe->tree().nextSibling())
nonFastScrollableRegion.unite(computeNonFastScrollableRegion(subframe, offset));
return nonFastScrollableRegion;
#endif
}
Region ScrollingCoordinator::computeNonFastScrollableRegion(Frame* frame, const IntPoint& frameLocation)
{
Region nonFastScrollableRegion;
FrameView* frameView = frame->view();
if (!frameView)
return nonFastScrollableRegion;
IntPoint offset = frameLocation;
offset.moveBy(frameView->frameRect().location());
if (const FrameView::ScrollableAreaSet* scrollableAreas = frameView->scrollableAreas()) {
for (FrameView::ScrollableAreaSet::const_iterator it = scrollableAreas->begin(), end = scrollableAreas->end(); it != end; ++it) {
ScrollableArea* scrollableArea = *it;
#if USE(ACCELERATED_COMPOSITING)
// Composited scrollable areas can be scrolled off the main thread.
if (scrollableArea->usesCompositedScrolling())
continue;
#endif
IntRect box = scrollableArea->scrollableAreaBoundingBox();
box.moveBy(offset);
nonFastScrollableRegion.unite(box);
}
}
if (const HashSet<RefPtr<Widget> >* children = frameView->children()) {
for (HashSet<RefPtr<Widget> >::const_iterator it = children->begin(), end = children->end(); it != end; ++it) {
if (!(*it)->isPluginViewBase())
continue;
PluginViewBase* pluginViewBase = static_cast<PluginViewBase*>((*it).get());
if (pluginViewBase->wantsWheelEvents())
nonFastScrollableRegion.unite(pluginViewBase->frameRect());
}
}
FrameTree* tree = frame->tree();
for (Frame* subFrame = tree->firstChild(); subFrame; subFrame = subFrame->tree()->nextSibling())
nonFastScrollableRegion.unite(computeNonFastScrollableRegion(subFrame, offset));
return nonFastScrollableRegion;
}