1 files changed, 165 insertions, 0 deletions
diff --git a/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.cpp b/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.cpp
new file mode 100644
index 000000000..19754f5c2
--- /dev/null
+++ b/Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.cpp
@@ -0,0 +1,165 @@
+/*
+ * 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 "ScrollingStateTree.h"
+#include "ScrollingTree.h"
+#include "TextStream.h"
+
+namespace WebCore {
+
+ScrollingTreeScrollingNode::ScrollingTreeScrollingNode(ScrollingTree& scrollingTree, ScrollingNodeType nodeType, ScrollingNodeID nodeID)
+    : ScrollingTreeNode(scrollingTree, nodeType, nodeID)
+{
+}
+
+ScrollingTreeScrollingNode::~ScrollingTreeScrollingNode()
+{
+}
+
+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 (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();
+}
+
+void ScrollingTreeScrollingNode::commitStateAfterChildren(const ScrollingStateNode& stateNode)
+{
+    const ScrollingStateScrollingNode& scrollingStateNode = downcast<ScrollingStateScrollingNode>(stateNode);
+    if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::RequestedScrollPosition))
+        scrollingTree().scrollingTreeNodeRequestsScroll(scrollingNodeID(), scrollingStateNode.requestedScrollPosition(), scrollingStateNode.requestedScrollPositionRepresentsProgrammaticScroll());
+}
+
+void ScrollingTreeScrollingNode::updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta)
+{
+    if (!m_children)
+        return;
+
+    for (auto& child : *m_children)
+        child->updateLayersAfterAncestorChange(changedNode, fixedPositionRect, cumulativeDelta);
+}
+
+void ScrollingTreeScrollingNode::setScrollPosition(const FloatPoint& scrollPosition)
+{
+    FloatPoint newScrollPosition = scrollPosition.constrainedBetween(minimumScrollPosition(), maximumScrollPosition());
+    setScrollPositionWithoutContentEdgeConstraints(newScrollPosition);
+}
+
+void ScrollingTreeScrollingNode::setScrollPositionWithoutContentEdgeConstraints(const FloatPoint& scrollPosition)
+{
+    setScrollLayerPosition(scrollPosition, { });
+    scrollingTree().scrollingTreeNodeDidScroll(scrollingNodeID(), scrollPosition, std::nullopt);
+}
+
+FloatPoint ScrollingTreeScrollingNode::minimumScrollPosition() const
+{
+    return FloatPoint();
+}
+
+FloatPoint ScrollingTreeScrollingNode::maximumScrollPosition() const
+{
+    FloatPoint contentSizePoint(totalContentsSize());
+    return FloatPoint(contentSizePoint - scrollableAreaSize()).expandedTo(FloatPoint());
+}
+
+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("scrollable area size", m_lastCommittedScrollPosition);
+    if (m_scrollOrigin != IntPoint())
+        ts.dumpProperty("scrollable area size", 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("horizontal 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
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(ASYNC_SCROLLING)