| /* |
| * Copyright (C) 2011 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 ScrollingCoordinator_h |
| #define ScrollingCoordinator_h |
| |
| #include "core/rendering/RenderObject.h" |
| #include "platform/PlatformWheelEvent.h" |
| #include "platform/geometry/IntRect.h" |
| #include "platform/scroll/ScrollTypes.h" |
| #include "wtf/text/WTFString.h" |
| |
| namespace WebKit { |
| class WebLayer; |
| class WebScrollbarLayer; |
| } |
| |
| namespace WebCore { |
| |
| typedef unsigned MainThreadScrollingReasons; |
| |
| class Document; |
| class Frame; |
| class FrameView; |
| class GraphicsLayer; |
| class Page; |
| class Region; |
| class ScrollableArea; |
| class ViewportConstraints; |
| |
| class ScrollingCoordinator : public RefCounted<ScrollingCoordinator> { |
| public: |
| static PassRefPtr<ScrollingCoordinator> create(Page*); |
| ~ScrollingCoordinator(); |
| |
| void pageDestroyed(); |
| |
| // Return whether this scrolling coordinator handles scrolling for the given frame view. |
| bool coordinatesScrollingForFrameView(FrameView*) const; |
| |
| // Should be called whenever the given frame view has been laid out. |
| void frameViewLayoutUpdated(FrameView*); |
| |
| // Should be called whenever a wheel event handler is added or removed in the |
| // frame view's underlying document. |
| void frameViewWheelEventHandlerCountChanged(FrameView*); |
| |
| // Should be called whenever the slow repaint objects counter changes between zero and one. |
| void frameViewHasSlowRepaintObjectsDidChange(FrameView*); |
| |
| // Should be called whenever the set of fixed objects changes. |
| void frameViewFixedObjectsDidChange(FrameView*); |
| |
| // Should be called whenever the root layer for the given frame view changes. |
| void frameViewRootLayerDidChange(FrameView*); |
| |
| #if OS(MACOSX) |
| // Dispatched by the scrolling tree during handleWheelEvent. This is required as long as scrollbars are painted on the main thread. |
| void handleWheelEventPhase(PlatformWheelEventPhase); |
| #endif |
| |
| enum MainThreadScrollingReasonFlags { |
| HasSlowRepaintObjects = 1 << 0, |
| HasViewportConstrainedObjectsWithoutSupportingFixedLayers = 1 << 1, |
| HasNonLayerViewportConstrainedObjects = 1 << 2, |
| }; |
| |
| MainThreadScrollingReasons mainThreadScrollingReasons() const; |
| bool shouldUpdateScrollLayerPositionOnMainThread() const { return mainThreadScrollingReasons() != 0; } |
| |
| PassOwnPtr<WebKit::WebScrollbarLayer> createSolidColorScrollbarLayer(ScrollbarOrientation, int thumbThickness, bool isLeftSideVerticalScrollbar); |
| |
| void willDestroyScrollableArea(ScrollableArea*); |
| // Returns true if the coordinator handled this change. |
| bool scrollableAreaScrollLayerDidChange(ScrollableArea*); |
| void scrollableAreaScrollbarLayerDidChange(ScrollableArea*, ScrollbarOrientation); |
| void setLayerIsContainerForFixedPositionLayers(GraphicsLayer*, bool); |
| void updateLayerPositionConstraint(RenderLayer*); |
| void touchEventTargetRectsDidChange(const Document*); |
| void willDestroyRenderLayer(RenderLayer*); |
| |
| void updateScrollParentForGraphicsLayer(GraphicsLayer* child, RenderLayer* parent); |
| void updateClipParentForGraphicsLayer(GraphicsLayer* child, RenderLayer* parent); |
| |
| static String mainThreadScrollingReasonsAsText(MainThreadScrollingReasons); |
| String mainThreadScrollingReasonsAsText() const; |
| Region computeShouldHandleScrollGestureOnMainThreadRegion(const Frame*, const IntPoint& frameLocation) const; |
| |
| protected: |
| explicit ScrollingCoordinator(Page*); |
| |
| static GraphicsLayer* scrollLayerForScrollableArea(ScrollableArea*); |
| static GraphicsLayer* horizontalScrollbarLayerForScrollableArea(ScrollableArea*); |
| static GraphicsLayer* verticalScrollbarLayerForScrollableArea(ScrollableArea*); |
| bool isForMainFrame(ScrollableArea*) const; |
| |
| unsigned computeCurrentWheelEventHandlerCount(); |
| GraphicsLayer* scrollLayerForFrameView(FrameView*); |
| GraphicsLayer* counterScrollingLayerForFrameView(FrameView*); |
| |
| Page* m_page; |
| |
| private: |
| void recomputeWheelEventHandlerCountForFrameView(FrameView*); |
| void setShouldUpdateScrollLayerPositionOnMainThread(MainThreadScrollingReasons); |
| |
| bool hasVisibleSlowRepaintViewportConstrainedObjects(FrameView*) const; |
| void updateShouldUpdateScrollLayerPositionOnMainThread(); |
| |
| static WebKit::WebLayer* scrollingWebLayerForScrollableArea(ScrollableArea*); |
| |
| bool touchHitTestingEnabled() const; |
| void setShouldHandleScrollGestureOnMainThreadRegion(const Region&); |
| void setTouchEventTargetRects(const LayerHitTestRects&); |
| void computeTouchEventTargetRects(LayerHitTestRects&); |
| void setWheelEventHandlerCount(unsigned); |
| |
| WebKit::WebScrollbarLayer* addWebScrollbarLayer(ScrollableArea*, ScrollbarOrientation, PassOwnPtr<WebKit::WebScrollbarLayer>); |
| WebKit::WebScrollbarLayer* getWebScrollbarLayer(ScrollableArea*, ScrollbarOrientation); |
| void removeWebScrollbarLayer(ScrollableArea*, ScrollbarOrientation); |
| |
| |
| typedef HashMap<ScrollableArea*, OwnPtr<WebKit::WebScrollbarLayer> > ScrollbarMap; |
| ScrollbarMap m_horizontalScrollbars; |
| ScrollbarMap m_verticalScrollbars; |
| HashSet<const RenderLayer*> m_layersWithTouchRects; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // ScrollingCoordinator_h |