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/*
* 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.
*/
#include "config.h"
#include "ScrollingTreeScrollingNode.h"
#if ENABLE(ASYNC_SCROLLING)
#include "Logging.h"
#include "ScrollingStateScrollingNode.h"
#include "ScrollingStateTree.h"
#include "ScrollingTree.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
ScrollingTreeScrollingNode::ScrollingTreeScrollingNode(ScrollingTree& scrollingTree, ScrollingNodeType nodeType, ScrollingNodeID nodeID)
: ScrollingTreeNode(scrollingTree, nodeType, nodeID)
{
}
ScrollingTreeScrollingNode::~ScrollingTreeScrollingNode() = default;
void ScrollingTreeScrollingNode::commitStateBeforeChildren(const ScrollingStateNode& stateNode)
{
const ScrollingStateScrollingNode& state = downcast<ScrollingStateScrollingNode>(stateNode);
if (state.hasChangedProperty(ScrollingStateScrollingNode::ScrollableAreaSize))
m_scrollableAreaSize = state.scrollableAreaSize();
if (state.hasChangedProperty(ScrollingStateScrollingNode::TotalContentsSize)) {
if (scrollingTree().isRubberBandInProgress())
m_totalContentsSizeForRubberBand = m_totalContentsSize;
else
m_totalContentsSizeForRubberBand = state.totalContentsSize();
m_totalContentsSize = state.totalContentsSize();
}
if (state.hasChangedProperty(ScrollingStateScrollingNode::ReachableContentsSize))
m_reachableContentsSize = state.reachableContentsSize();
if (state.hasChangedProperty(ScrollingStateScrollingNode::ScrollPosition)) {
m_lastCommittedScrollPosition = state.scrollPosition();
if (m_isFirstCommit && !state.hasChangedProperty(ScrollingStateScrollingNode::RequestedScrollPosition))
m_currentScrollPosition = m_lastCommittedScrollPosition;
}
if (state.hasChangedProperty(ScrollingStateScrollingNode::ParentRelativeScrollableRect))
m_parentRelativeScrollableRect = state.parentRelativeScrollableRect();
if (state.hasChangedProperty(ScrollingStateScrollingNode::ScrollOrigin))
m_scrollOrigin = state.scrollOrigin();
#if ENABLE(CSS_SCROLL_SNAP)
if (state.hasChangedProperty(ScrollingStateScrollingNode::HorizontalSnapOffsets))
m_snapOffsetsInfo.horizontalSnapOffsets = state.horizontalSnapOffsets();
if (state.hasChangedProperty(ScrollingStateScrollingNode::VerticalSnapOffsets))
m_snapOffsetsInfo.verticalSnapOffsets = state.verticalSnapOffsets();
if (state.hasChangedProperty(ScrollingStateScrollingNode::HorizontalSnapOffsetRanges))
m_snapOffsetsInfo.horizontalSnapOffsetRanges = state.horizontalSnapOffsetRanges();
if (state.hasChangedProperty(ScrollingStateScrollingNode::VerticalSnapOffsetRanges))
m_snapOffsetsInfo.verticalSnapOffsetRanges = state.verticalSnapOffsetRanges();
if (state.hasChangedProperty(ScrollingStateScrollingNode::CurrentHorizontalSnapOffsetIndex))
m_currentHorizontalSnapPointIndex = state.currentHorizontalSnapPointIndex();
if (state.hasChangedProperty(ScrollingStateScrollingNode::CurrentVerticalSnapOffsetIndex))
m_currentVerticalSnapPointIndex = state.currentVerticalSnapPointIndex();
#endif
if (state.hasChangedProperty(ScrollingStateScrollingNode::ScrollableAreaParams))
m_scrollableAreaParameters = state.scrollableAreaParameters();
if (state.hasChangedProperty(ScrollingStateScrollingNode::IsMonitoringWheelEvents))
m_isMonitoringWheelEvents = state.isMonitoringWheelEvents();
if (state.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer))
m_scrollContainerLayer = state.scrollContainerLayer();
if (state.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
m_scrolledContentsLayer = state.scrolledContentsLayer();
}
void ScrollingTreeScrollingNode::commitStateAfterChildren(const ScrollingStateNode& stateNode)
{
const ScrollingStateScrollingNode& scrollingStateNode = downcast<ScrollingStateScrollingNode>(stateNode);
if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::RequestedScrollPosition))
scrollingTree().scrollingTreeNodeRequestsScroll(scrollingNodeID(), scrollingStateNode.requestedScrollPosition(), scrollingStateNode.requestedScrollPositionRepresentsProgrammaticScroll());
m_isFirstCommit = false;
}
ScrollingEventResult ScrollingTreeScrollingNode::handleWheelEvent(const PlatformWheelEvent&)
{
return ScrollingEventResult::DidNotHandleEvent;
}
FloatPoint ScrollingTreeScrollingNode::clampScrollPosition(const FloatPoint& scrollPosition) const
{
return scrollPosition.constrainedBetween(minimumScrollPosition(), maximumScrollPosition());
}
FloatPoint ScrollingTreeScrollingNode::minimumScrollPosition() const
{
auto minimumScrollOffset = FloatPoint { };
return ScrollableArea::scrollPositionFromOffset(minimumScrollOffset, toFloatSize(scrollOrigin()));
}
FloatPoint ScrollingTreeScrollingNode::maximumScrollPosition() const
{
FloatPoint contentSizePoint(totalContentsSize());
auto maximumScrollOffset = FloatPoint(contentSizePoint - scrollableAreaSize()).expandedTo(FloatPoint());
return ScrollableArea::scrollPositionFromOffset(maximumScrollOffset, toFloatSize(scrollOrigin()));
}
bool ScrollingTreeScrollingNode::scrollLimitReached(const PlatformWheelEvent& wheelEvent) const
{
FloatPoint oldScrollPosition = currentScrollPosition();
FloatPoint newScrollPosition = oldScrollPosition + FloatSize(wheelEvent.deltaX(), -wheelEvent.deltaY());
newScrollPosition = newScrollPosition.constrainedBetween(minimumScrollPosition(), maximumScrollPosition());
return newScrollPosition == oldScrollPosition;
}
FloatPoint ScrollingTreeScrollingNode::adjustedScrollPosition(const FloatPoint& scrollPosition, ScrollPositionClamp clamp) const
{
if (clamp == ScrollPositionClamp::ToContentEdges)
return clampScrollPosition(scrollPosition);
return scrollPosition;
}
void ScrollingTreeScrollingNode::scrollBy(const FloatSize& delta, ScrollPositionClamp clamp)
{
scrollTo(currentScrollPosition() + delta, ScrollType::User, clamp);
}
void ScrollingTreeScrollingNode::scrollTo(const FloatPoint& position, ScrollType scrollType, ScrollPositionClamp clamp)
{
if (position == m_currentScrollPosition)
return;
scrollingTree().setIsHandlingProgrammaticScroll(scrollType == ScrollType::Programmatic);
m_currentScrollPosition = adjustedScrollPosition(position, clamp);
LOG_WITH_STREAM(Scrolling, stream << "ScrollingTreeScrollingNode " << scrollingNodeID() << " scrollTo " << position << " (delta from last committed position " << (m_lastCommittedScrollPosition - m_currentScrollPosition) << ")");
updateViewportForCurrentScrollPosition();
currentScrollPositionChanged();
scrollingTree().setIsHandlingProgrammaticScroll(false);
}
void ScrollingTreeScrollingNode::currentScrollPositionChanged()
{
repositionScrollingLayers();
repositionRelatedLayers();
scrollingTree().notifyRelatedNodesAfterScrollPositionChange(*this);
scrollingTree().scrollingTreeNodeDidScroll(*this);
}
bool ScrollingTreeScrollingNode::scrollPositionAndLayoutViewportMatch(const FloatPoint& position, Optional<FloatRect>)
{
return position == m_currentScrollPosition;
}
void ScrollingTreeScrollingNode::applyLayerPositions()
{
repositionScrollingLayers();
repositionRelatedLayers();
}
void ScrollingTreeScrollingNode::wasScrolledByDelegatedScrolling(const FloatPoint& position, Optional<FloatRect> overrideLayoutViewport, ScrollingLayerPositionAction scrollingLayerPositionAction)
{
bool scrollPositionChanged = !scrollPositionAndLayoutViewportMatch(position, overrideLayoutViewport);
if (!scrollPositionChanged && scrollingLayerPositionAction != ScrollingLayerPositionAction::Set)
return;
m_currentScrollPosition = adjustedScrollPosition(position, ScrollPositionClamp::None);
updateViewportForCurrentScrollPosition(overrideLayoutViewport);
repositionRelatedLayers();
scrollingTree().notifyRelatedNodesAfterScrollPositionChange(*this);
scrollingTree().scrollingTreeNodeDidScroll(*this, scrollingLayerPositionAction);
scrollingTree().didScrollByDelegatedScrolling();
}
LayoutPoint ScrollingTreeScrollingNode::parentToLocalPoint(LayoutPoint point) const
{
return point - toLayoutSize(parentRelativeScrollableRect().location());
}
LayoutPoint ScrollingTreeScrollingNode::localToContentsPoint(LayoutPoint point) const
{
return point + LayoutPoint(currentScrollPosition());
}
ScrollingTreeScrollingNode* ScrollingTreeScrollingNode::scrollingNodeForPoint(LayoutPoint parentPoint) const
{
if (auto* node = ScrollingTreeNode::scrollingNodeForPoint(parentPoint))
return node;
if (parentRelativeScrollableRect().contains(parentPoint))
return const_cast<ScrollingTreeScrollingNode*>(this);
return nullptr;
}
void ScrollingTreeScrollingNode::dumpProperties(TextStream& ts, ScrollingStateTreeAsTextBehavior behavior) const
{
ScrollingTreeNode::dumpProperties(ts, behavior);
ts.dumpProperty("scrollable area size", m_scrollableAreaSize);
ts.dumpProperty("total content size", m_totalContentsSize);
if (m_totalContentsSizeForRubberBand != m_totalContentsSize)
ts.dumpProperty("total content size for rubber band", m_totalContentsSizeForRubberBand);
if (m_reachableContentsSize != m_totalContentsSize)
ts.dumpProperty("reachable content size", m_reachableContentsSize);
ts.dumpProperty("last committed scroll position", m_lastCommittedScrollPosition);
if (!m_parentRelativeScrollableRect.isEmpty())
ts.dumpProperty("parent relative scrollable rect", m_parentRelativeScrollableRect);
if (m_scrollOrigin != IntPoint())
ts.dumpProperty("scroll origin", m_scrollOrigin);
#if ENABLE(CSS_SCROLL_SNAP)
if (m_snapOffsetsInfo.horizontalSnapOffsets.size())
ts.dumpProperty("horizontal snap offsets", m_snapOffsetsInfo.horizontalSnapOffsets);
if (m_snapOffsetsInfo.verticalSnapOffsets.size())
ts.dumpProperty("vertical snap offsets", m_snapOffsetsInfo.verticalSnapOffsets);
if (m_currentHorizontalSnapPointIndex)
ts.dumpProperty("current horizontal snap point index", m_currentHorizontalSnapPointIndex);
if (m_currentVerticalSnapPointIndex)
ts.dumpProperty("current vertical snap point index", m_currentVerticalSnapPointIndex);
#endif
ts.dumpProperty("scrollable area parameters", m_scrollableAreaParameters);
}
} // namespace WebCore
#endif // ENABLE(ASYNC_SCROLLING)