| /* |
| * 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 ScrollingTreeFrameScrollingNode; |
| class ScrollingTreeScrollingNode; |
| |
| class ScrollingTreeNode : public ThreadSafeRefCounted<ScrollingTreeNode> { |
| friend class ScrollingTree; |
| public: |
| virtual ~ScrollingTreeNode(); |
| |
| ScrollingNodeType nodeType() const { return m_nodeType; } |
| ScrollingNodeID scrollingNodeID() const { return m_nodeID; } |
| |
| bool isFixedNode() const { return nodeType() == ScrollingNodeType::Fixed; } |
| bool isStickyNode() const { return nodeType() == ScrollingNodeType::Sticky; } |
| bool isPositionedNode() const { return nodeType() == ScrollingNodeType::Positioned; } |
| bool isScrollingNode() const { return isFrameScrollingNode() || isOverflowScrollingNode(); } |
| bool isFrameScrollingNode() const { return nodeType() == ScrollingNodeType::MainFrame || nodeType() == ScrollingNodeType::Subframe; } |
| bool isFrameHostingNode() const { return nodeType() == ScrollingNodeType::FrameHosting; } |
| bool isOverflowScrollingNode() const { return nodeType() == ScrollingNodeType::Overflow; } |
| bool isOverflowScrollProxyNode() const { return nodeType() == ScrollingNodeType::OverflowProxy; } |
| |
| virtual void commitStateBeforeChildren(const ScrollingStateNode&) = 0; |
| virtual void commitStateAfterChildren(const ScrollingStateNode&) { } |
| virtual void didCompleteCommitForNode() { } |
| |
| virtual void willBeDestroyed() { } |
| |
| ScrollingTreeNode* parent() const { return m_parent; } |
| void setParent(ScrollingTreeNode* parent) { m_parent = parent; } |
| |
| WEBCORE_EXPORT bool isRootNode() const; |
| |
| const Vector<Ref<ScrollingTreeNode>>& children() const { return m_children; } |
| |
| void appendChild(Ref<ScrollingTreeNode>&&); |
| void removeChild(ScrollingTreeNode&); |
| void removeAllChildren(); |
| |
| WEBCORE_EXPORT ScrollingTreeFrameScrollingNode* enclosingFrameNodeIncludingSelf(); |
| WEBCORE_EXPORT ScrollingTreeScrollingNode* enclosingScrollingNodeIncludingSelf(); |
| |
| WEBCORE_EXPORT void dump(WTF::TextStream&, ScrollingStateTreeAsTextBehavior) const; |
| |
| protected: |
| ScrollingTreeNode(ScrollingTree&, ScrollingNodeType, ScrollingNodeID); |
| ScrollingTree& scrollingTree() const { return m_scrollingTree; } |
| |
| virtual void applyLayerPositions() = 0; |
| |
| WEBCORE_EXPORT virtual void dumpProperties(WTF::TextStream&, ScrollingStateTreeAsTextBehavior) const; |
| |
| Vector<Ref<ScrollingTreeNode>> m_children; |
| |
| private: |
| ScrollingTree& m_scrollingTree; |
| |
| const ScrollingNodeType m_nodeType; |
| const ScrollingNodeID m_nodeID; |
| |
| ScrollingTreeNode* m_parent { nullptr }; |
| }; |
| |
| } // 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) |