bool RemoteScrollingCoordinatorTransaction::decode(IPC::ArgumentDecoder& decoder)
{
int numNodes;
if (!decoder.decode(numNodes))
return false;
bool hasNewRootNode;
if (!decoder.decode(hasNewRootNode))
return false;
m_scrollingStateTree = ScrollingStateTree::create();
for (int i = 0; i < numNodes; ++i) {
ScrollingNodeType nodeType;
if (!decoder.decodeEnum(nodeType))
return false;
ScrollingNodeID nodeID;
if (!decoder.decode(nodeID))
return false;
ScrollingNodeID parentNodeID;
if (!decoder.decode(parentNodeID))
return false;
m_scrollingStateTree->attachNode(nodeType, nodeID, parentNodeID);
ScrollingStateNode* newNode = m_scrollingStateTree->stateNodeForID(nodeID);
ASSERT(newNode);
ASSERT(!parentNodeID || newNode->parent());
switch (nodeType) {
case FrameScrollingNode:
case OverflowScrollingNode:
if (!decoder.decode(*toScrollingStateScrollingNode(newNode)))
return false;
break;
case FixedNode:
if (!decoder.decode(*toScrollingStateFixedNode(newNode)))
return false;
break;
case StickyNode:
if (!decoder.decode(*toScrollingStateStickyNode(newNode)))
return false;
break;
}
}
m_scrollingStateTree->setHasNewRootStateNode(hasNewRootNode);
// Removed nodes
Vector<ScrollingNodeID> removedNodes;
if (!decoder.decode(removedNodes))
return false;
if (removedNodes.size())
m_scrollingStateTree->setRemovedNodes(removedNodes);
return true;
}
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 = toScrollingStateFixedNode(node);
fixedNode->setLayer(graphicsLayer);
fixedNode->updateConstraints((const FixedPositionViewportConstraints&)constraints);
break;
}
case ViewportConstraints::StickyPositionConstraint: {
ScrollingStateStickyNode* stickyNode = toScrollingStateStickyNode(node);
stickyNode->setLayer(graphicsLayer);
stickyNode->updateConstraints((const StickyPositionViewportConstraints&)constraints);
break;
}
}
}
static void encodeNodeAndDescendants(IPC::ArgumentEncoder& encoder, const ScrollingStateNode& stateNode)
{
switch (stateNode.nodeType()) {
case FrameScrollingNode:
case OverflowScrollingNode:
encoder << toScrollingStateScrollingNode(stateNode);
break;
case FixedNode:
encoder << toScrollingStateFixedNode(stateNode);
break;
case StickyNode:
encoder << toScrollingStateStickyNode(stateNode);
break;
}
if (!stateNode.children())
return;
for (size_t i = 0; i < stateNode.children()->size(); ++i) {
const OwnPtr<ScrollingStateNode>& child = stateNode.children()->at(i);
encodeNodeAndDescendants(encoder, *child.get());
}
}