ScrollingNodeID ScrollingStateTree::attachNode(ScrollingNodeType nodeType, ScrollingNodeID newNodeID, ScrollingNodeID parentID)
{
ASSERT(newNodeID);
if (ScrollingStateNode* node = stateNodeForID(newNodeID)) {
ScrollingStateNode* parent = stateNodeForID(parentID);
if (!parent)
return newNodeID;
if (node->parent() == parent)
return newNodeID;
// The node is being re-parented. To do that, we'll remove it, and then re-create a new node.
removeNode(node);
}
ScrollingStateNode* newNode = 0;
if (!parentID) {
// If we're resetting the root node, we should clear the HashMap and destroy the current children.
clear();
setRootStateNode(ScrollingStateFrameScrollingNode::create(*this, newNodeID));
newNode = rootStateNode();
m_hasNewRootStateNode = true;
} else {
ScrollingStateNode* parent = stateNodeForID(parentID);
if (!parent)
return 0;
switch (nodeType) {
case FixedNode: {
OwnPtr<ScrollingStateFixedNode> fixedNode = ScrollingStateFixedNode::create(*this, newNodeID);
newNode = fixedNode.get();
parent->appendChild(fixedNode.release());
break;
}
case StickyNode: {
OwnPtr<ScrollingStateStickyNode> stickyNode = ScrollingStateStickyNode::create(*this, newNodeID);
newNode = stickyNode.get();
parent->appendChild(stickyNode.release());
break;
}
case FrameScrollingNode: {
OwnPtr<ScrollingStateFrameScrollingNode> scrollingNode = ScrollingStateFrameScrollingNode::create(*this, newNodeID);
newNode = scrollingNode.get();
parent->appendChild(scrollingNode.release());
break;
}
case OverflowScrollingNode: {
OwnPtr<ScrollingStateOverflowScrollingNode> scrollingNode = ScrollingStateOverflowScrollingNode::create(*this, newNodeID);
newNode = scrollingNode.get();
parent->appendChild(scrollingNode.release());
break;
}
}
}
m_stateNodeMap.set(newNodeID, newNode);
return newNodeID;
}
ScrollingNodeID ScrollingStateTree::attachNode(ScrollingNodeType nodeType, ScrollingNodeID newNodeID, ScrollingNodeID parentID)
{
ASSERT(newNodeID);
if (ScrollingStateNode* node = stateNodeForID(newNodeID)) {
if (!parentID)
return newNodeID;
ScrollingStateNode* parent = stateNodeForID(parentID);
if (!parent)
return newNodeID;
if (node->parent() == parent)
return newNodeID;
// The node is being re-parented. To do that, we'll remove it, and then re-create a new node.
removeNodeAndAllDescendants(node, SubframeNodeRemoval::Orphan);
}
ScrollingStateNode* newNode = nullptr;
if (!parentID) {
// If we're resetting the root node, we should clear the HashMap and destroy the current children.
clear();
setRootStateNode(ScrollingStateFrameScrollingNode::create(*this, newNodeID));
newNode = rootStateNode();
m_hasNewRootStateNode = true;
} else {
ScrollingStateNode* parent = stateNodeForID(parentID);
if (!parent)
return 0;
if (nodeType == FrameScrollingNode && parentID) {
if (RefPtr<ScrollingStateNode> orphanedNode = m_orphanedSubframeNodes.take(newNodeID)) {
newNode = orphanedNode.get();
parent->appendChild(orphanedNode.release());
}
}
if (!newNode) {
RefPtr<ScrollingStateNode> stateNode = createNode(nodeType, newNodeID);
newNode = stateNode.get();
parent->appendChild(stateNode.release());
}
}
m_stateNodeMap.set(newNodeID, newNode);
m_nodesRemovedSinceLastCommit.remove(newNodeID);
return newNodeID;
}