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/*
* Copyright (C) 2019 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 "ScrollingConstraints.h"
#include "ScrollingStateNode.h"
#include <wtf/Forward.h>
namespace WebCore {
// ScrollingStatePositionedNode is used to manage the layers for z-order composited descendants of overflow:scroll
// which are not containing block descendants (i.e. position:absolute). These layers must have their position inside their ancestor clipping
// layer adjusted on the scrolling thread.
class ScrollingStatePositionedNode final : public ScrollingStateNode {
WTF_MAKE_TZONE_ALLOCATED_EXPORT(ScrollingStatePositionedNode, WEBCORE_EXPORT);
public:
template<typename... Args> static Ref<ScrollingStatePositionedNode> create(Args&&... args) { return adoptRef(*new ScrollingStatePositionedNode(std::forward<Args>(args)...)); }
Ref<ScrollingStateNode> clone(ScrollingStateTree&) override;
virtual ~ScrollingStatePositionedNode();
// These are the overflow scrolling nodes whose scroll position affects the layers in this node.
const Vector<ScrollingNodeID>& relatedOverflowScrollingNodes() const { return m_relatedOverflowScrollingNodes; }
WEBCORE_EXPORT void setRelatedOverflowScrollingNodes(Vector<ScrollingNodeID>&&);
WEBCORE_EXPORT void updateConstraints(const AbsolutePositionConstraints&);
const AbsolutePositionConstraints& layoutConstraints() const { return m_constraints; }
private:
WEBCORE_EXPORT ScrollingStatePositionedNode(ScrollingNodeID, Vector<Ref<ScrollingStateNode>>&&, OptionSet<ScrollingStateNodeProperty>, std::optional<PlatformLayerIdentifier>, Vector<ScrollingNodeID>&&, AbsolutePositionConstraints&&);
ScrollingStatePositionedNode(ScrollingStateTree&, ScrollingNodeID);
ScrollingStatePositionedNode(const ScrollingStatePositionedNode&, ScrollingStateTree&);
void dumpProperties(WTF::TextStream&, OptionSet<ScrollingStateTreeAsTextBehavior>) const final;
OptionSet<ScrollingStateNode::Property> applicableProperties() const final;
Vector<ScrollingNodeID> m_relatedOverflowScrollingNodes;
AbsolutePositionConstraints m_constraints;
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_SCROLLING_STATE_NODE(ScrollingStatePositionedNode, isPositionedNode())
#endif // ENABLE(ASYNC_SCROLLING)
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