| /* |
| * 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 "ScrollingTreeStickyNode.h" |
| |
| #if ENABLE(ASYNC_SCROLLING) |
| |
| #import "Logging.h" |
| #import "ScrollingStateStickyNode.h" |
| #import "ScrollingTree.h" |
| #import "ScrollingTreeFixedNode.h" |
| #import "ScrollingTreeFrameScrollingNode.h" |
| #import "ScrollingTreeOverflowScrollProxyNode.h" |
| #import "ScrollingTreeOverflowScrollingNode.h" |
| #import "WebCoreCALayerExtras.h" |
| #import <wtf/text/TextStream.h> |
| |
| namespace WebCore { |
| |
| Ref<ScrollingTreeStickyNode> ScrollingTreeStickyNode::create(ScrollingTree& scrollingTree, ScrollingNodeID nodeID) |
| { |
| return adoptRef(*new ScrollingTreeStickyNode(scrollingTree, nodeID)); |
| } |
| |
| ScrollingTreeStickyNode::ScrollingTreeStickyNode(ScrollingTree& scrollingTree, ScrollingNodeID nodeID) |
| : ScrollingTreeNode(scrollingTree, ScrollingNodeType::Sticky, nodeID) |
| { |
| scrollingTree.fixedOrStickyNodeAdded(); |
| } |
| |
| ScrollingTreeStickyNode::~ScrollingTreeStickyNode() |
| { |
| scrollingTree().fixedOrStickyNodeRemoved(); |
| } |
| |
| void ScrollingTreeStickyNode::commitStateBeforeChildren(const ScrollingStateNode& stateNode) |
| { |
| const ScrollingStateStickyNode& stickyStateNode = downcast<ScrollingStateStickyNode>(stateNode); |
| |
| if (stickyStateNode.hasChangedProperty(ScrollingStateNode::Layer)) |
| m_layer = static_cast<CALayer*>(stickyStateNode.layer()); |
| |
| if (stateNode.hasChangedProperty(ScrollingStateStickyNode::ViewportConstraints)) |
| m_constraints = stickyStateNode.viewportConstraints(); |
| } |
| |
| FloatPoint ScrollingTreeStickyNode::computeLayerPosition() const |
| { |
| auto computeLayerPositionForScrollingNode = [&](ScrollingTreeNode& scrollingNode) { |
| FloatRect constrainingRect; |
| if (is<ScrollingTreeFrameScrollingNode>(scrollingNode)) { |
| auto& frameScrollingNode = downcast<ScrollingTreeFrameScrollingNode>(scrollingNode); |
| constrainingRect = frameScrollingNode.layoutViewport(); |
| } else { |
| auto& overflowScrollingNode = downcast<ScrollingTreeOverflowScrollingNode>(scrollingNode); |
| constrainingRect = FloatRect(overflowScrollingNode.currentScrollPosition(), m_constraints.constrainingRectAtLastLayout().size()); |
| } |
| return m_constraints.layerPositionForConstrainingRect(constrainingRect); |
| }; |
| |
| for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) { |
| if (is<ScrollingTreeOverflowScrollProxyNode>(*ancestor)) { |
| auto& overflowProxyNode = downcast<ScrollingTreeOverflowScrollProxyNode>(*ancestor); |
| auto overflowNode = scrollingTree().nodeForID(overflowProxyNode.overflowScrollingNodeID()); |
| if (!overflowNode) |
| break; |
| |
| return computeLayerPositionForScrollingNode(*overflowNode); |
| } |
| |
| if (is<ScrollingTreeScrollingNode>(*ancestor)) |
| return computeLayerPositionForScrollingNode(*ancestor); |
| |
| if (is<ScrollingTreeFixedNode>(*ancestor) || is<ScrollingTreeStickyNode>(*ancestor)) { |
| // FIXME: Do we need scrolling tree nodes at all for nested cases? |
| return m_constraints.layerPositionAtLastLayout(); |
| } |
| } |
| ASSERT_NOT_REACHED(); |
| return m_constraints.layerPositionAtLastLayout(); |
| } |
| |
| void ScrollingTreeStickyNode::applyLayerPositions() |
| { |
| auto layerPosition = computeLayerPosition(); |
| |
| LOG_WITH_STREAM(Scrolling, stream << "ScrollingTreeStickyNode " << scrollingNodeID() << " constrainingRectAtLastLayout " << m_constraints.constrainingRectAtLastLayout() << " last layer pos " << m_constraints.layerPositionAtLastLayout() << " layerPosition " << layerPosition); |
| |
| [m_layer _web_setLayerTopLeftPosition:layerPosition - m_constraints.alignmentOffset()]; |
| } |
| |
| FloatSize ScrollingTreeStickyNode::scrollDeltaSinceLastCommit() const |
| { |
| auto layerPosition = computeLayerPosition(); |
| return layerPosition - m_constraints.layerPositionAtLastLayout(); |
| } |
| |
| void ScrollingTreeStickyNode::dumpProperties(TextStream& ts, ScrollingStateTreeAsTextBehavior behavior) const |
| { |
| ts << "sticky node"; |
| |
| ScrollingTreeNode::dumpProperties(ts, behavior); |
| ts.dumpProperty("sticky constraints", m_constraints); |
| |
| if (behavior & ScrollingStateTreeAsTextBehaviorIncludeLayerPositions) { |
| FloatRect layerBounds = [m_layer bounds]; |
| FloatPoint anchorPoint = [m_layer anchorPoint]; |
| FloatPoint position = [m_layer position]; |
| FloatPoint layerTopLeft = position - toFloatSize(anchorPoint) * layerBounds.size() + m_constraints.alignmentOffset(); |
| ts.dumpProperty("layer top left", layerTopLeft); |
| } |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(ASYNC_SCROLLING) |