void ScrollingTree::setOrClearLatchedNode(const PlatformWheelEvent& wheelEvent, ScrollingNodeID nodeID)
{
if (wheelEvent.shouldConsiderLatching())
setLatchedNode(nodeID);
else if (wheelEvent.shouldResetLatching())
clearLatchedNode();
}
void ScrollingTree::removeDestroyedNodes(const ScrollingStateTree& stateTree)
{
for (const auto& removedNodeID : stateTree.removedNodes()) {
m_nodeMap.remove(removedNodeID);
if (removedNodeID == m_latchedNode)
clearLatchedNode();
}
}
void ScrollingTree::removeDestroyedNodes(const ScrollingStateTree& stateTree)
{
for (const auto& removedNode : stateTree.removedNodes()) {
ScrollingTreeNode* node = m_nodeMap.take(removedNode);
if (!node)
continue;
if (node->scrollingNodeID() == m_latchedNode)
clearLatchedNode();
// Never destroy the root node. There will be a new root node in the state tree, and we will
// associate it with our existing root node in updateTreeFromStateNode().
if (node->parent())
m_rootNode->removeChild(node);
}
}
