ScrollingTreeFrameScrollingNode.h [plain text]
#ifndef ScrollingTreeFrameScrollingNode_h
#define ScrollingTreeFrameScrollingNode_h
#if ENABLE(ASYNC_SCROLLING)
#include "ScrollingTreeScrollingNode.h"
namespace WebCore {
class PlatformWheelEvent;
class ScrollingTree;
class ScrollingStateScrollingNode;
class ScrollingTreeFrameScrollingNode : public ScrollingTreeScrollingNode {
public:
virtual ~ScrollingTreeFrameScrollingNode();
virtual void updateBeforeChildren(const ScrollingStateNode&) override;
virtual void updateLayersAfterAncestorChange(const ScrollingTreeNode& , const FloatRect& , const FloatSize& ) override { }
virtual void handleWheelEvent(const PlatformWheelEvent&) = 0;
virtual void setScrollPosition(const FloatPoint&);
virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&) = 0;
virtual void updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double scale) = 0;
virtual void updateLayersAfterDelegatedScroll(const FloatPoint&) { }
SynchronousScrollingReasons synchronousScrollingReasons() const { return m_synchronousScrollingReasons; }
bool shouldUpdateScrollLayerPositionSynchronously() const { return m_synchronousScrollingReasons; }
protected:
ScrollingTreeFrameScrollingNode(ScrollingTree&, ScrollingNodeID);
void scrollBy(const FloatSize&);
void scrollByWithoutContentEdgeConstraints(const FloatSize&);
float frameScaleFactor() const { return m_frameScaleFactor; }
int headerHeight() const { return m_headerHeight; }
int footerHeight() const { return m_footerHeight; }
float topContentInset() const { return m_topContentInset; }
ScrollBehaviorForFixedElements scrollBehaviorForFixedElements() const { return m_behaviorForFixed; }
private:
float m_frameScaleFactor;
int m_headerHeight;
int m_footerHeight;
float m_topContentInset;
SynchronousScrollingReasons m_synchronousScrollingReasons;
ScrollBehaviorForFixedElements m_behaviorForFixed;
};
SCROLLING_NODE_TYPE_CASTS(ScrollingTreeFrameScrollingNode, isFrameScrollingNode());
}
#endif // ENABLE(ASYNC_SCROLLING)
#endif // ScrollingTreeScrollingNode_h