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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.
*/
#include "config.h"
#include "ScrollingTreeStickyNode.h"
#if ENABLE(ASYNC_SCROLLING)
#include "Logging.h"
#include "ScrollingStateStickyNode.h"
#include "ScrollingTree.h"
#include "ScrollingTreeFixedNode.h"
#include "ScrollingTreeFrameScrollingNode.h"
#include "ScrollingTreeOverflowScrollProxyNode.h"
#include "ScrollingTreeOverflowScrollingNode.h"
#include <wtf/TZoneMallocInlines.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(ScrollingTreeStickyNode);
ScrollingTreeStickyNode::ScrollingTreeStickyNode(ScrollingTree& scrollingTree, ScrollingNodeID nodeID)
: ScrollingTreeNode(scrollingTree, ScrollingNodeType::Sticky, nodeID)
{
scrollingTree.fixedOrStickyNodeAdded(*this);
}
ScrollingTreeStickyNode::~ScrollingTreeStickyNode() = default;
bool ScrollingTreeStickyNode::commitStateBeforeChildren(const ScrollingStateNode& stateNode)
{
auto* stickyStateNode = dynamicDowncast<ScrollingStateStickyNode>(stateNode);
if (!stickyStateNode)
return false;
if (stickyStateNode->hasChangedProperty(ScrollingStateNode::Property::ViewportConstraints))
m_constraints = stickyStateNode->viewportConstraints();
return true;
}
void ScrollingTreeStickyNode::dumpProperties(TextStream& ts, OptionSet<ScrollingStateTreeAsTextBehavior> behavior) const
{
ts << "sticky node";
ScrollingTreeNode::dumpProperties(ts, behavior);
ts.dumpProperty("sticky constraints", m_constraints);
if (behavior & ScrollingStateTreeAsTextBehavior::IncludeLayerPositions)
ts.dumpProperty("layer top left", layerTopLeft());
}
FloatPoint ScrollingTreeStickyNode::computeLayerPosition() const
{
FloatSize offsetFromStickyAncestors;
auto computeLayerPositionForScrollingNode = [&](ScrollingTreeNode& scrollingNode) {
FloatRect constrainingRect;
if (auto* frameScrollingNode = dynamicDowncast<ScrollingTreeFrameScrollingNode>(scrollingNode))
constrainingRect = frameScrollingNode->layoutViewport();
else if (auto* overflowScrollingNode = dynamicDowncast<ScrollingTreeOverflowScrollingNode>(scrollingNode)) {
constrainingRect = m_constraints.constrainingRectAtLastLayout();
constrainingRect.move(overflowScrollingNode->scrollDeltaSinceLastCommit());
}
constrainingRect.move(-offsetFromStickyAncestors);
return m_constraints.layerPositionForConstrainingRect(constrainingRect);
};
for (RefPtr ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
if (auto* overflowProxyNode = dynamicDowncast<ScrollingTreeOverflowScrollProxyNode>(*ancestor)) {
auto overflowNode = scrollingTree()->nodeForID(overflowProxyNode->overflowScrollingNodeID());
if (!overflowNode)
break;
return computeLayerPositionForScrollingNode(*overflowNode);
}
if (is<ScrollingTreeScrollingNode>(*ancestor))
return computeLayerPositionForScrollingNode(*ancestor);
if (auto* stickyNode = dynamicDowncast<ScrollingTreeStickyNode>(*ancestor))
offsetFromStickyAncestors += stickyNode->scrollDeltaSinceLastCommit();
if (is<ScrollingTreeFixedNode>(*ancestor)) {
// FIXME: Do we need scrolling tree nodes at all for nested cases?
return m_constraints.layerPositionAtLastLayout();
}
}
ASSERT_NOT_REACHED();
return m_constraints.layerPositionAtLastLayout();
}
FloatSize ScrollingTreeStickyNode::scrollDeltaSinceLastCommit() const
{
auto layerPosition = computeLayerPosition();
return layerPosition - m_constraints.layerPositionAtLastLayout();
}
} // namespace WebCore
#endif // ENABLE(ASYNC_SCROLLING)
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