| /* |
| * 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. |
| */ |
| |
| #import "config.h" |
| #import "ScrollingTreePositionedNode.h" |
| |
| #if ENABLE(ASYNC_SCROLLING) |
| |
| #import "Logging.h" |
| #import "ScrollingStatePositionedNode.h" |
| #import "ScrollingTree.h" |
| #import "ScrollingTreeOverflowScrollingNode.h" |
| #import "ScrollingTreeScrollingNode.h" |
| #import <QuartzCore/CALayer.h> |
| #import <wtf/text/TextStream.h> |
| |
| namespace WebCore { |
| |
| Ref<ScrollingTreePositionedNode> ScrollingTreePositionedNode::create(ScrollingTree& scrollingTree, ScrollingNodeID nodeID) |
| { |
| return adoptRef(*new ScrollingTreePositionedNode(scrollingTree, nodeID)); |
| } |
| |
| ScrollingTreePositionedNode::ScrollingTreePositionedNode(ScrollingTree& scrollingTree, ScrollingNodeID nodeID) |
| : ScrollingTreeNode(scrollingTree, ScrollingNodeType::Positioned, nodeID) |
| { |
| } |
| |
| ScrollingTreePositionedNode::~ScrollingTreePositionedNode() = default; |
| |
| void ScrollingTreePositionedNode::commitStateBeforeChildren(const ScrollingStateNode& stateNode) |
| { |
| const ScrollingStatePositionedNode& positionedStateNode = downcast<ScrollingStatePositionedNode>(stateNode); |
| |
| if (positionedStateNode.hasChangedProperty(ScrollingStateNode::Layer)) |
| m_layer = positionedStateNode.layer(); |
| |
| if (positionedStateNode.hasChangedProperty(ScrollingStatePositionedNode::RelatedOverflowScrollingNodes)) |
| m_relatedOverflowScrollingNodes = positionedStateNode.relatedOverflowScrollingNodes(); |
| |
| if (positionedStateNode.hasChangedProperty(ScrollingStatePositionedNode::LayoutConstraintData)) |
| m_constraints = positionedStateNode.layoutConstraints(); |
| |
| // Tell the ScrollingTree about non-ancestor overflow nodes which affect this node. |
| if (m_constraints.scrollPositioningBehavior() == ScrollPositioningBehavior::Moves) { |
| auto& relatedNodes = scrollingTree().overflowRelatedNodes(); |
| for (auto overflowNodeID : m_relatedOverflowScrollingNodes) { |
| relatedNodes.ensure(overflowNodeID, [] { |
| return Vector<ScrollingNodeID>(); |
| }).iterator->value.append(scrollingNodeID()); |
| } |
| } |
| if (!m_relatedOverflowScrollingNodes.isEmpty() && m_constraints.scrollPositioningBehavior() != ScrollPositioningBehavior::None) |
| scrollingTree().positionedNodesWithRelatedOverflow().add(scrollingNodeID()); |
| } |
| |
| void ScrollingTreePositionedNode::applyLayerPositions(const FloatRect&, FloatSize& cumulativeDelta) |
| { |
| // Note that we ignore cumulativeDelta because it will contain the delta for ancestor scrollers, |
| // but not non-ancestor ones, so it's simpler to just recompute from the scrollers we know about here. |
| FloatSize scrollOffsetSinceLastCommit; |
| for (auto nodeID : m_relatedOverflowScrollingNodes) { |
| if (auto* node = scrollingTree().nodeForID(nodeID)) { |
| if (is<ScrollingTreeOverflowScrollingNode>(node)) { |
| auto& overflowNode = downcast<ScrollingTreeOverflowScrollingNode>(*node); |
| scrollOffsetSinceLastCommit += overflowNode.lastCommittedScrollPosition() - overflowNode.currentScrollPosition(); |
| } |
| } |
| } |
| auto layerOffset = -scrollOffsetSinceLastCommit; |
| if (m_constraints.scrollPositioningBehavior() == ScrollPositioningBehavior::Stationary) { |
| // Stationary nodes move in the opposite direction. |
| layerOffset = -layerOffset; |
| } |
| |
| FloatPoint layerPosition = m_constraints.layerPositionAtLastLayout() - layerOffset; |
| |
| LOG_WITH_STREAM(Scrolling, stream << "ScrollingTreePositionedNode " << scrollingNodeID() << " applyLayerPositions: overflow delta " << scrollOffsetSinceLastCommit << " moving layer to " << layerPosition); |
| |
| [m_layer _web_setLayerTopLeftPosition:layerPosition - m_constraints.alignmentOffset()]; |
| |
| // FIXME: Should our scroller deltas propagate to descendants? |
| cumulativeDelta = layerPosition - m_constraints.layerPositionAtLastLayout(); |
| } |
| |
| void ScrollingTreePositionedNode::relatedNodeScrollPositionDidChange(const ScrollingTreeScrollingNode& changedNode, const FloatRect& layoutViewport, FloatSize& cumulativeDelta) |
| { |
| if (!m_relatedOverflowScrollingNodes.contains(changedNode.scrollingNodeID())) |
| return; |
| |
| applyLayerPositions(layoutViewport, cumulativeDelta); |
| } |
| |
| void ScrollingTreePositionedNode::dumpProperties(TextStream& ts, ScrollingStateTreeAsTextBehavior behavior) const |
| { |
| ts << "positioned node"; |
| ScrollingTreeNode::dumpProperties(ts, behavior); |
| |
| ts.dumpProperty("layout constraints", m_constraints); |
| ts.dumpProperty("related overflow nodes", m_relatedOverflowScrollingNodes.size()); |
| |
| if (behavior & ScrollingStateTreeAsTextBehaviorIncludeNodeIDs) { |
| if (!m_relatedOverflowScrollingNodes.isEmpty()) { |
| TextStream::GroupScope scope(ts); |
| ts << "overflow nodes"; |
| for (auto nodeID : m_relatedOverflowScrollingNodes) |
| ts << "\n" << indent << "nodeID " << nodeID; |
| } |
| } |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(ASYNC_SCROLLING) |