void ScrollingTree::setOrClearLatchedNode(const PlatformWheelEvent& wheelEvent, ScrollingNodeID nodeID)
{
if (wheelEvent.shouldConsiderLatching())
setLatchedNode(nodeID);
else if (wheelEvent.shouldResetLatching())
clearLatchedNode();
}
bool ScrollingTree::shouldHandleWheelEventSynchronously(const PlatformWheelEvent& wheelEvent)
{
// This method is invoked by the event handling thread
MutexLocker lock(m_mutex);
if (m_hasWheelEventHandlers)
return true;
bool shouldSetLatch = wheelEvent.shouldConsiderLatching();
if (hasLatchedNode() && !shouldSetLatch)
return false;
if (shouldSetLatch)
m_latchedNode = 0;
if (!m_nonFastScrollableRegion.isEmpty()) {
// FIXME: This is not correct for non-default scroll origins.
FloatPoint position = wheelEvent.position();
position.moveBy(m_mainFrameScrollPosition);
if (m_nonFastScrollableRegion.contains(roundedIntPoint(position)))
return true;
}
return false;
}