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31 #ifndef PinchViewport_h
32 #define PinchViewport_h
34 #include "platform/geometry/FloatPoint.h"
35 #include "platform/geometry/FloatRect.h"
36 #include "platform/geometry/IntSize.h"
37 #include "platform/graphics/GraphicsLayerClient.h"
38 #include "platform/scroll/ScrollableArea.h"
39 #include "public/platform/WebScrollbar.h"
40 #include "public/platform/WebSize.h"
41 #include "wtf/OwnPtr.h"
42 #include "wtf/PassOwnPtr.h"
45 class WebLayerTreeView;
46 class WebScrollbarLayer;
52 class GraphicsContext;
54 class GraphicsLayerFactory;
59 // Represents the pinch-to-zoom viewport the user is currently seeing the page through. This
60 // class corresponds to the InnerViewport on the compositor. It is a ScrollableArea; it's
61 // offset is set through the GraphicsLayer <-> CC sync mechanisms. Its contents is the page's
62 // main FrameView, which corresponds to the outer viewport. The inner viewport is always contained
63 // in the outer viewport and can pan within it.
64 class PinchViewport FINAL : public GraphicsLayerClient, public ScrollableArea {
66 explicit PinchViewport(FrameHost&);
67 virtual ~PinchViewport();
69 void attachToLayerTree(GraphicsLayer*, GraphicsLayerFactory*);
70 GraphicsLayer* rootGraphicsLayer()
72 return m_innerViewportContainerLayer.get();
75 // Sets the location of the inner viewport relative to the outer viewport. The
76 // coordinates are in partial CSS pixels.
77 void setLocation(const FloatPoint&);
78 void move(const FloatPoint&);
80 // Sets the size of the inner viewport when unscaled in CSS pixels.
81 // This will be clamped to the size of the outer viewport (the main frame).
82 void setSize(const IntSize&);
83 IntSize size() const { return m_size; }
85 // Resets the viewport to initial state.
88 // Let the viewport know that the main frame changed size (either through screen
89 // rotation on Android or window resize elsewhere).
90 void mainFrameDidChangeSize();
93 float scale() const { return m_scale; }
95 void registerLayersWithTreeView(blink::WebLayerTreeView*) const;
96 void clearLayersForTreeView(blink::WebLayerTreeView*) const;
98 // The portion of the unzoomed frame visible in the inner "pinch" viewport, in partial CSS pixels.
99 FloatRect visibleRect() const;
101 // ScrollableArea implementation
102 virtual bool isActive() const OVERRIDE { return false; }
103 virtual int scrollSize(ScrollbarOrientation) const OVERRIDE;
104 virtual bool isScrollCornerVisible() const OVERRIDE { return false; }
105 virtual IntRect scrollCornerRect() const OVERRIDE { return IntRect(); }
106 virtual IntPoint scrollPosition() const OVERRIDE { return flooredIntPoint(m_offset); }
107 virtual IntPoint minimumScrollPosition() const OVERRIDE;
108 virtual IntPoint maximumScrollPosition() const OVERRIDE;
109 virtual int visibleHeight() const OVERRIDE { return visibleRect().height(); };
110 virtual int visibleWidth() const OVERRIDE { return visibleRect().width(); };
111 virtual IntSize contentsSize() const OVERRIDE;
112 virtual bool scrollbarsCanBeActive() const OVERRIDE { return false; }
113 virtual IntRect scrollableAreaBoundingBox() const OVERRIDE;
114 virtual bool userInputScrollable(ScrollbarOrientation) const OVERRIDE { return true; }
115 virtual bool shouldPlaceVerticalScrollbarOnLeft() const OVERRIDE { return false; }
116 virtual void invalidateScrollbarRect(Scrollbar*, const IntRect&) OVERRIDE;
117 virtual void invalidateScrollCornerRect(const IntRect&) OVERRIDE { }
118 virtual void setScrollOffset(const IntPoint&) OVERRIDE;
119 virtual GraphicsLayer* layerForContainer() const OVERRIDE;
120 virtual GraphicsLayer* layerForScrolling() const OVERRIDE;
121 virtual GraphicsLayer* layerForHorizontalScrollbar() const OVERRIDE;
122 virtual GraphicsLayer* layerForVerticalScrollbar() const OVERRIDE;
124 // GraphicsLayerClient implementation.
125 virtual void notifyAnimationStarted(const GraphicsLayer*, double monotonicTime) OVERRIDE;
126 virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect& inClip) OVERRIDE;
127 virtual String debugName(const GraphicsLayer*) OVERRIDE;
129 void setupScrollbar(blink::WebScrollbar::Orientation);
130 FloatPoint clampOffsetToBoundaries(const FloatPoint&);
132 LocalFrame* mainFrame() const;
134 FrameHost& m_frameHost;
135 OwnPtr<GraphicsLayer> m_innerViewportContainerLayer;
136 OwnPtr<GraphicsLayer> m_pageScaleLayer;
137 OwnPtr<GraphicsLayer> m_innerViewportScrollLayer;
138 OwnPtr<GraphicsLayer> m_overlayScrollbarHorizontal;
139 OwnPtr<GraphicsLayer> m_overlayScrollbarVertical;
140 OwnPtr<blink::WebScrollbarLayer> m_webOverlayScrollbarHorizontal;
141 OwnPtr<blink::WebScrollbarLayer> m_webOverlayScrollbarVertical;
143 // Offset of the pinch viewport from the main frame's origin, in CSS pixels.
149 } // namespace WebCore
151 #endif // PinchViewport_h