SynchronousScrollingReasons ScrollingCoordinator::synchronousScrollingReasons(FrameView* frameView) const
{
if (!frameView)
return static_cast<SynchronousScrollingReasons>(0);
SynchronousScrollingReasons synchronousScrollingReasons = (SynchronousScrollingReasons)0;
if (m_forceSynchronousScrollLayerPositionUpdates)
synchronousScrollingReasons |= ForcedOnMainThread;
#if ENABLE(WEB_REPLAY)
InputCursor& cursor = m_page->replayController().activeInputCursor();
if (cursor.isCapturing() || cursor.isReplaying())
synchronousScrollingReasons |= ForcedOnMainThread;
#endif
if (frameView->hasSlowRepaintObjects())
synchronousScrollingReasons |= HasSlowRepaintObjects;
if (!supportsFixedPositionLayers() && frameView->hasViewportConstrainedObjects())
synchronousScrollingReasons |= HasViewportConstrainedObjectsWithoutSupportingFixedLayers;
if (supportsFixedPositionLayers() && hasVisibleSlowRepaintViewportConstrainedObjects(frameView))
synchronousScrollingReasons |= HasNonLayerViewportConstrainedObjects;
if (frameView->frame().mainFrame().document() && frameView->frame().document()->isImageDocument())
synchronousScrollingReasons |= IsImageDocument;
return synchronousScrollingReasons;
}
MainThreadScrollingReasons ScrollingCoordinator::mainThreadScrollingReasons() const
{
FrameView* frameView = m_page->mainFrame()->view();
MainThreadScrollingReasons mainThreadScrollingReasons = (MainThreadScrollingReasons)0;
if (m_forceMainThreadScrollLayerPositionUpdates)
mainThreadScrollingReasons |= ForcedOnMainThread;
if (frameView->hasSlowRepaintObjects())
mainThreadScrollingReasons |= HasSlowRepaintObjects;
if (!supportsFixedPositionLayers() && frameView->hasViewportConstrainedObjects())
mainThreadScrollingReasons |= HasViewportConstrainedObjectsWithoutSupportingFixedLayers;
if (supportsFixedPositionLayers() && hasNonLayerFixedObjects(frameView))
mainThreadScrollingReasons |= HasNonLayerFixedObjects;
if (m_page->mainFrame()->document()->isImageDocument())
mainThreadScrollingReasons |= IsImageDocument;
return mainThreadScrollingReasons;
}
SynchronousScrollingReasons ScrollingCoordinator::synchronousScrollingReasons() const
{
FrameView* frameView = m_page->mainFrame().view();
if (!frameView)
return static_cast<SynchronousScrollingReasons>(0);
SynchronousScrollingReasons synchronousScrollingReasons = (SynchronousScrollingReasons)0;
if (m_forceSynchronousScrollLayerPositionUpdates)
synchronousScrollingReasons |= ForcedOnMainThread;
if (frameView->hasSlowRepaintObjects())
synchronousScrollingReasons |= HasSlowRepaintObjects;
if (!supportsFixedPositionLayers() && frameView->hasViewportConstrainedObjects())
synchronousScrollingReasons |= HasViewportConstrainedObjectsWithoutSupportingFixedLayers;
if (supportsFixedPositionLayers() && hasVisibleSlowRepaintViewportConstrainedObjects(frameView))
synchronousScrollingReasons |= HasNonLayerViewportConstrainedObjects;
if (m_page->mainFrame().document() && m_page->mainFrame().document()->isImageDocument())
synchronousScrollingReasons |= IsImageDocument;
return synchronousScrollingReasons;
}
void ScrollingCoordinatorCoordinatedGraphics::updateViewportConstrainedNode(ScrollingNodeID nodeID, const ViewportConstraints& constraints, GraphicsLayer* graphicsLayer)
{
ASSERT(supportsFixedPositionLayers());
ScrollingStateNode* node = m_scrollingStateTree->stateNodeForID(nodeID);
if (!node)
return;
switch (constraints.constraintType()) {
case ViewportConstraints::FixedPositionConstraint: {
toCoordinatedGraphicsLayer(graphicsLayer)->setFixedToViewport(true); // FIXME : Use constraints!
downcast<ScrollingStateFixedNode>(*node).setLayer(graphicsLayer);
break;
}
case ViewportConstraints::StickyPositionConstraint:
break; // FIXME : Support sticky elements.
default:
ASSERT_NOT_REACHED();
}
}
void AsyncScrollingCoordinator::updateViewportConstrainedNode(ScrollingNodeID nodeID, const ViewportConstraints& constraints, GraphicsLayer* graphicsLayer)
{
ASSERT(supportsFixedPositionLayers());
ScrollingStateNode* node = m_scrollingStateTree->stateNodeForID(nodeID);
if (!node)
return;
switch (constraints.constraintType()) {
case ViewportConstraints::FixedPositionConstraint: {
ScrollingStateFixedNode& fixedNode = downcast<ScrollingStateFixedNode>(*node);
fixedNode.setLayer(graphicsLayer);
fixedNode.updateConstraints((const FixedPositionViewportConstraints&)constraints);
break;
}
case ViewportConstraints::StickyPositionConstraint: {
ScrollingStateStickyNode& stickyNode = downcast<ScrollingStateStickyNode>(*node);
stickyNode.setLayer(graphicsLayer);
stickyNode.updateConstraints((const StickyPositionViewportConstraints&)constraints);
break;
}
}
}