Fold ScrollingCoordinatorChromium into ScrollingCoordinator and devirtualize

Source/WebCore/page/scrolling/mac/ScrollingCoordinatorMac.h

-/*
- * 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.
- */
-
-#ifndef ScrollingCoordinatorMac_h
-#define ScrollingCoordinatorMac_h
-
-#if ENABLE(THREADED_SCROLLING)
-
-#include "ScrollingCoordinator.h"
-
-namespace WebCore {
-
-class ScrollingStateNode;
-class ScrollingStateScrollingNode;
-class ScrollingStateTree;
-
-class ScrollingCoordinatorMac : public ScrollingCoordinator {
-public:
-    explicit ScrollingCoordinatorMac(Page*);
-    virtual ~ScrollingCoordinatorMac();
-
-    virtual void pageDestroyed();
-
-    virtual ScrollingTree* scrollingTree() const;
-    virtual void commitTreeStateIfNeeded();
-
-    // Should be called whenever the given frame view has been laid out.
-    virtual void frameViewLayoutUpdated(FrameView*);
-
-    // Should be called whenever the root layer for the given frame view changes.
-    virtual void frameViewRootLayerDidChange(FrameView*);
-
-    // Should be called whenever the scrollbar layer for the given scrollable area changes.
-    virtual void scrollableAreaScrollbarLayerDidChange(ScrollableArea*, ScrollbarOrientation);
-
-    // Requests that the scrolling coordinator updates the scroll position of the given frame view. If this function returns true, it means that the
-    // position will be updated asynchronously. If it returns false, the caller should update the scrolling position itself.
-    virtual bool requestScrollPositionUpdate(FrameView*, const IntPoint&);
-
-    // Handle the wheel event on the scrolling thread. Returns whether the event was handled or not.
-    virtual bool handleWheelEvent(FrameView*, const PlatformWheelEvent&);
-
-    // These functions are used to indicate that a layer should be (or should not longer be) represented by a node
-    // in the scrolling tree.
-    virtual ScrollingNodeID attachToStateTree(ScrollingNodeType, ScrollingNodeID newNodeID, ScrollingNodeID parentID);
-    virtual void detachFromStateTree(ScrollingNodeID);
-
-    // This function wipes out the current tree.
-    virtual void clearStateTree();
-
-    virtual String scrollingStateTreeAsText() const OVERRIDE;
-
-    virtual bool isRubberBandInProgress() const OVERRIDE;
-    virtual bool rubberBandsAtBottom() const OVERRIDE;
-    virtual void setRubberBandsAtBottom(bool) OVERRIDE;
-    virtual bool rubberBandsAtTop() const OVERRIDE;
-    virtual void setRubberBandsAtTop(bool) OVERRIDE;
-
-private:
-    // Return whether this scrolling coordinator can keep fixed position layers fixed to their
-    // containers while scrolling.
-    virtual bool supportsFixedPositionLayers() const OVERRIDE { return true; }
-
-    // This function will update the ScrollingStateNode for the given viewport constrained object.
-    virtual void updateViewportConstrainedNode(ScrollingNodeID, const ViewportConstraints&, GraphicsLayer*) OVERRIDE;
-
-    virtual void updateScrollingNode(ScrollingNodeID, GraphicsLayer* scrollLayer, GraphicsLayer* counterScrollingLayer) OVERRIDE;
-
-    // Called to synch the GraphicsLayer positions for child layers when their CALayers have been moved by the scrolling thread.
-    virtual void syncChildPositions(const LayoutRect& viewportRect) OVERRIDE;
-
-    virtual void recomputeWheelEventHandlerCountForFrameView(FrameView*);
-    virtual void setShouldUpdateScrollLayerPositionOnMainThread(MainThreadScrollingReasons);
-
-    virtual bool hasVisibleSlowRepaintViewportConstrainedObjects(FrameView*) const { return false; }
-
-    void ensureRootStateNodeForFrameView(FrameView*);
-
-    struct ScrollParameters {
-        ScrollElasticity horizontalScrollElasticity;
-        ScrollElasticity verticalScrollElasticity;
-
-        bool hasEnabledHorizontalScrollbar;
-        bool hasEnabledVerticalScrollbar;
-
-        ScrollbarMode horizontalScrollbarMode;
-        ScrollbarMode verticalScrollbarMode;
-
-        IntPoint scrollOrigin;
-
-        IntRect viewportRect;
-        IntSize totalContentsSize;
-        
-        float frameScaleFactor;
-
-        int headerHeight;
-        int footerHeight;
-    };
-
-    void setScrollParametersForNode(const ScrollParameters&, ScrollingStateScrollingNode*);
-    void setScrollLayerForNode(GraphicsLayer*, ScrollingStateNode*);
-    void setCounterScrollingLayerForNode(GraphicsLayer*, ScrollingStateScrollingNode*);
-    void setNonFastScrollableRegionForNode(const Region&, ScrollingStateScrollingNode*);
-    void setWheelEventHandlerCountForNode(unsigned, ScrollingStateScrollingNode*);
-
-    void updateMainFrameScrollLayerPosition();
-
-    void scheduleTreeStateCommit();
-
-    void scrollingStateTreeCommitterTimerFired(Timer<ScrollingCoordinatorMac>*);
-    void commitTreeState();
-
-    OwnPtr<ScrollingStateTree> m_scrollingStateTree;
-    RefPtr<ScrollingTree> m_scrollingTree;
-    Timer<ScrollingCoordinatorMac> m_scrollingStateTreeCommitterTimer;
-};
-
-} // namespace WebCore
-
-#endif // ENABLE(THREADED_SCROLLING)
-
-#endif // ScrollingCoordinatorMac_h