71 lines
3.1 KiB
C++
71 lines
3.1 KiB
C++
/*
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* Copyright (C) 2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(ASYNC_SCROLLING)
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#include "ScrollingConstraints.h"
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#include "ScrollingStateNode.h"
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#include <wtf/Forward.h>
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namespace WebCore {
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// ScrollingStatePositionedNode is used to manage the layers for z-order composited descendants of overflow:scroll
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// which are not containing block descendants (i.e. position:absolute). These layers must have their position inside their ancestor clipping
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// layer adjusted on the scrolling thread.
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class ScrollingStatePositionedNode final : public ScrollingStateNode {
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public:
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static Ref<ScrollingStatePositionedNode> create(ScrollingStateTree&, ScrollingNodeID);
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Ref<ScrollingStateNode> clone(ScrollingStateTree&) override;
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virtual ~ScrollingStatePositionedNode();
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// These are the overflow scrolling nodes whose scroll position affects the layers in this node.
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const Vector<ScrollingNodeID>& relatedOverflowScrollingNodes() const { return m_relatedOverflowScrollingNodes; }
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WEBCORE_EXPORT void setRelatedOverflowScrollingNodes(Vector<ScrollingNodeID>&&);
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WEBCORE_EXPORT void updateConstraints(const AbsolutePositionConstraints&);
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const AbsolutePositionConstraints& layoutConstraints() const { return m_constraints; }
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private:
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ScrollingStatePositionedNode(ScrollingStateTree&, ScrollingNodeID);
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ScrollingStatePositionedNode(const ScrollingStatePositionedNode&, ScrollingStateTree&);
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void dumpProperties(WTF::TextStream&, ScrollingStateTreeAsTextBehavior) const final;
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OptionSet<ScrollingStateNode::Property> applicableProperties() const final;
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Vector<ScrollingNodeID> m_relatedOverflowScrollingNodes;
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AbsolutePositionConstraints m_constraints;
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};
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} // namespace WebCore
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SPECIALIZE_TYPE_TRAITS_SCROLLING_STATE_NODE(ScrollingStatePositionedNode, isPositionedNode())
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#endif // ENABLE(ASYNC_SCROLLING)
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