ScrollingTreeOverflowScrollProxyNode.cpp [plain text]
#include "config.h"
#include "ScrollingTreeOverflowScrollProxyNode.h"
#if ENABLE(ASYNC_SCROLLING) && USE(NICOSIA)
#include "Logging.h"
#include "NicosiaPlatformLayer.h"
#include "ScrollingStateOverflowScrollProxyNode.h"
#include "ScrollingStateTree.h"
#include "ScrollingTree.h"
#include "ScrollingTreeOverflowScrollingNode.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
Ref<ScrollingTreeOverflowScrollProxyNode> ScrollingTreeOverflowScrollProxyNode::create(ScrollingTree& scrollingTree, ScrollingNodeID nodeID)
{
return adoptRef(*new ScrollingTreeOverflowScrollProxyNode(scrollingTree, nodeID));
}
ScrollingTreeOverflowScrollProxyNode::ScrollingTreeOverflowScrollProxyNode(ScrollingTree& scrollingTree, ScrollingNodeID nodeID)
: ScrollingTreeNode(scrollingTree, ScrollingNodeType::OverflowProxy, nodeID)
{
}
ScrollingTreeOverflowScrollProxyNode::~ScrollingTreeOverflowScrollProxyNode() = default;
void ScrollingTreeOverflowScrollProxyNode::commitStateBeforeChildren(const ScrollingStateNode& stateNode)
{
const ScrollingStateOverflowScrollProxyNode& overflowProxyStateNode = downcast<ScrollingStateOverflowScrollProxyNode>(stateNode);
if (overflowProxyStateNode.hasChangedProperty(ScrollingStateNode::Layer)) {
auto* layer = static_cast<Nicosia::PlatformLayer*>(stateNode.layer());
m_layer = downcast<Nicosia::CompositionLayer>(layer);
}
if (overflowProxyStateNode.hasChangedProperty(ScrollingStateOverflowScrollProxyNode::OverflowScrollingNode))
m_overflowScrollingNodeID = overflowProxyStateNode.overflowScrollingNode();
if (m_overflowScrollingNodeID) {
scrollingTree().overflowRelatedNodes().ensure(m_overflowScrollingNodeID,
[] {
return Vector<ScrollingNodeID>();
}).iterator->value.append(scrollingNodeID());
scrollingTree().activeOverflowScrollProxyNodes().add(*this);
}
}
void ScrollingTreeOverflowScrollProxyNode::applyLayerPositions()
{
FloatPoint scrollOffset;
if (auto* node = scrollingTree().nodeForID(m_overflowScrollingNodeID)) {
if (is<ScrollingTreeOverflowScrollingNode>(node)) {
auto& overflowNode = downcast<ScrollingTreeOverflowScrollingNode>(*node);
scrollOffset = overflowNode.currentScrollOffset();
}
}
LOG_WITH_STREAM(Scrolling, stream << "ScrollingTreeOverflowScrollProxyNode " << scrollingNodeID() << " applyLayerPositions: setting bounds origin to " << scrollOffset);
m_layer->accessStaging(
[&scrollOffset](Nicosia::CompositionLayer::LayerState& state)
{
state.boundsOrigin = scrollOffset;
state.delta.boundsOriginChanged = true;
});
}
void ScrollingTreeOverflowScrollProxyNode::dumpProperties(TextStream& ts, ScrollingStateTreeAsTextBehavior behavior) const
{
ts << "overflow scroll proxy node";
ScrollingTreeNode::dumpProperties(ts, behavior);
if (auto* relatedOverflowNode = scrollingTree().nodeForID(m_overflowScrollingNodeID)) {
auto scrollPosition = downcast<ScrollingTreeOverflowScrollingNode>(*relatedOverflowNode).currentScrollPosition();
ts.dumpProperty("related overflow scrolling node scroll position", scrollPosition);
}
if (behavior & ScrollingStateTreeAsTextBehaviorIncludeNodeIDs)
ts.dumpProperty("overflow scrolling node", m_overflowScrollingNodeID);
}
}
#endif // ENABLE(ASYNC_SCROLLING) && USE(NICOSIA)