ScrollingStateTree.h [plain text]
#pragma once
#if ENABLE(ASYNC_SCROLLING) || USE(COORDINATED_GRAPHICS)
#include "ScrollingStateFrameScrollingNode.h"
#include <wtf/RefPtr.h>
namespace WebCore {
class AsyncScrollingCoordinator;
class ScrollingStateTree {
WTF_MAKE_FAST_ALLOCATED;
friend class ScrollingStateNode;
public:
WEBCORE_EXPORT ScrollingStateTree(AsyncScrollingCoordinator* = nullptr);
WEBCORE_EXPORT ~ScrollingStateTree();
ScrollingStateFrameScrollingNode* rootStateNode() const { return m_rootStateNode.get(); }
WEBCORE_EXPORT ScrollingStateNode* stateNodeForID(ScrollingNodeID) const;
WEBCORE_EXPORT ScrollingNodeID attachNode(ScrollingNodeType, ScrollingNodeID, ScrollingNodeID parentID);
void detachNode(ScrollingNodeID);
void clear();
const HashSet<ScrollingNodeID>& removedNodes() const { return m_nodesRemovedSinceLastCommit; }
WEBCORE_EXPORT void setRemovedNodes(HashSet<ScrollingNodeID>);
WEBCORE_EXPORT std::unique_ptr<ScrollingStateTree> commit(LayerRepresentation::Type preferredLayerRepresentation);
WEBCORE_EXPORT void setHasChangedProperties(bool = true);
bool hasChangedProperties() const { return m_hasChangedProperties; }
bool hasNewRootStateNode() const { return m_hasNewRootStateNode; }
void setHasNewRootStateNode(bool hasNewRoot) { m_hasNewRootStateNode = hasNewRoot; }
int nodeCount() const { return m_stateNodeMap.size(); }
typedef HashMap<ScrollingNodeID, ScrollingStateNode*> StateNodeMap;
const StateNodeMap& nodeMap() const { return m_stateNodeMap; }
LayerRepresentation::Type preferredLayerRepresentation() const { return m_preferredLayerRepresentation; }
void setPreferredLayerRepresentation(LayerRepresentation::Type representation) { m_preferredLayerRepresentation = representation; }
private:
void setRootStateNode(Ref<ScrollingStateFrameScrollingNode>&& rootStateNode) { m_rootStateNode = WTFMove(rootStateNode); }
void addNode(ScrollingStateNode*);
Ref<ScrollingStateNode> createNode(ScrollingNodeType, ScrollingNodeID);
bool nodeTypeAndParentMatch(ScrollingStateNode&, ScrollingNodeType, ScrollingNodeID parentID) const;
enum class SubframeNodeRemoval { Delete, Orphan };
void removeNodeAndAllDescendants(ScrollingStateNode*, SubframeNodeRemoval = SubframeNodeRemoval::Delete);
void recursiveNodeWillBeRemoved(ScrollingStateNode* currNode, SubframeNodeRemoval);
void willRemoveNode(ScrollingStateNode*);
AsyncScrollingCoordinator* m_scrollingCoordinator;
StateNodeMap m_stateNodeMap;
RefPtr<ScrollingStateFrameScrollingNode> m_rootStateNode;
HashSet<ScrollingNodeID> m_nodesRemovedSinceLastCommit;
HashMap<ScrollingNodeID, RefPtr<ScrollingStateNode>> m_orphanedSubframeNodes;
bool m_hasChangedProperties;
bool m_hasNewRootStateNode;
LayerRepresentation::Type m_preferredLayerRepresentation;
};
}
#ifndef NDEBUG
void showScrollingStateTree(const WebCore::ScrollingStateTree*);
void showScrollingStateTree(const WebCore::ScrollingStateNode*);
#endif
#endif // ENABLE(ASYNC_SCROLLING) || USE(COORDINATED_GRAPHICS)