1 files changed, 94 insertions, 0 deletions
diff --git a/Source/WebCore/page/scrolling/ScrollingTreeNode.h b/Source/WebCore/page/scrolling/ScrollingTreeNode.h
new file mode 100644
index 000000000..2e163246b
--- /dev/null
+++ b/Source/WebCore/page/scrolling/ScrollingTreeNode.h
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(ASYNC_SCROLLING)
+
+#include "IntRect.h"
+#include "ScrollTypes.h"
+#include "ScrollingCoordinator.h"
+#include "ScrollingStateNode.h"
+#include <wtf/RefCounted.h>
+#include <wtf/TypeCasts.h>
+
+namespace WebCore {
+
+class ScrollingStateFixedNode;
+class ScrollingStateScrollingNode;
+
+class ScrollingTreeNode : public RefCounted<ScrollingTreeNode> {
+public:
+    virtual ~ScrollingTreeNode();
+
+    ScrollingNodeType nodeType() const { return m_nodeType; }
+    ScrollingNodeID scrollingNodeID() const { return m_nodeID; }
+    
+    bool isFixedNode() const { return nodeType() == FixedNode; }
+    bool isStickyNode() const { return nodeType() == StickyNode; }
+    bool isScrollingNode() const { return nodeType() == FrameScrollingNode || nodeType() == OverflowScrollingNode; }
+    bool isFrameScrollingNode() const { return nodeType() == FrameScrollingNode; }
+    bool isOverflowScrollingNode() const { return nodeType() == OverflowScrollingNode; }
+
+    virtual void commitStateBeforeChildren(const ScrollingStateNode&) = 0;
+    virtual void commitStateAfterChildren(const ScrollingStateNode&) { }
+
+    virtual void updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta) = 0;
+
+    ScrollingTreeNode* parent() const { return m_parent; }
+    void setParent(ScrollingTreeNode* parent) { m_parent = parent; }
+
+    Vector<RefPtr<ScrollingTreeNode>>* children() { return m_children.get(); }
+
+    void appendChild(Ref<ScrollingTreeNode>&&);
+    void removeChild(ScrollingTreeNode&);
+
+    WEBCORE_EXPORT void dump(TextStream&, ScrollingStateTreeAsTextBehavior) const;
+
+protected:
+    ScrollingTreeNode(ScrollingTree&, ScrollingNodeType, ScrollingNodeID);
+    ScrollingTree& scrollingTree() const { return m_scrollingTree; }
+
+    std::unique_ptr<Vector<RefPtr<ScrollingTreeNode>>> m_children;
+
+    WEBCORE_EXPORT virtual void dumpProperties(TextStream&, ScrollingStateTreeAsTextBehavior) const;
+
+private:
+    ScrollingTree& m_scrollingTree;
+
+    const ScrollingNodeType m_nodeType;
+    const ScrollingNodeID m_nodeID;
+
+    ScrollingTreeNode* m_parent;
+};
+
+} // namespace WebCore
+
+#define SPECIALIZE_TYPE_TRAITS_SCROLLING_NODE(ToValueTypeName, predicate) \
+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ToValueTypeName) \
+    static bool isType(const WebCore::ScrollingTreeNode& node) { return node.predicate; } \
+SPECIALIZE_TYPE_TRAITS_END()
+
+#endif // ENABLE(ASYNC_SCROLLING)