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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
* Copyright (C) 2019 Igalia S.L.
*
* 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* HOLDER OR 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 "ScrollingPlatformLayer.h"
#include "ScrollingTreeNode.h"
#include "ScrollingTreeViewportConstrainedNode.h"
#include <wtf/RefPtr.h>
#include <wtf/TZoneMalloc.h>
namespace WebCore {
class ScrollingTreeStickyNode : public ScrollingTreeViewportConstrainedNode {
WTF_MAKE_TZONE_ALLOCATED(ScrollingTreeStickyNode);
public:
virtual ~ScrollingTreeStickyNode();
FloatSize scrollDeltaSinceLastCommit() const;
WEBCORE_EXPORT bool isCurrentlySticking() const;
protected:
ScrollingTreeStickyNode(ScrollingTree&, ScrollingNodeID);
bool commitStateBeforeChildren(const ScrollingStateNode&) override;
FloatPoint computeClippingLayerPosition() const;
std::optional<FloatRect> findConstrainingRect() const;
std::pair<std::optional<FloatRect>, FloatPoint> computeConstrainingRectAndAnchorLayerPosition() const;
void dumpProperties(WTF::TextStream&, OptionSet<ScrollingStateTreeAsTextBehavior>) const override;
virtual FloatPoint layerTopLeft() const = 0;
virtual bool hasViewportClippingLayer() const { return false; }
const ViewportConstraints& constraints() const final { return m_constraints; }
bool isCurrentlySticking(const FloatRect& constrainingRect) const;
StickyPositionViewportConstraints m_constraints;
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_SCROLLING_NODE(ScrollingTreeStickyNode, isStickyNode())
#endif // ENABLE(ASYNC_SCROLLING)
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