Upstream version 9.38.198.0

[platform/framework/web/crosswalk.git] / src / third_party / WebKit / Source / core / frame / PinchViewport.h

diff --git a/src/third_party/WebKit/Source/core/frame/PinchViewport.h b/src/third_party/WebKit/Source/core/frame/PinchViewport.h
index 02bc0b8..b934131 100644 (file)
--- a/src/third_party/WebKit/Source/core/frame/PinchViewport.h
+++ b/src/third_party/WebKit/Source/core/frame/PinchViewport.h
@@ -31,6 +31,8 @@
 #ifndef PinchViewport_h
 #define PinchViewport_h
 
+#include "platform/geometry/FloatPoint.h"
+#include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/GraphicsLayerClient.h"
 #include "platform/scroll/ScrollableArea.h"
@@ -44,7 +46,7 @@ class WebLayerTreeView;
 class WebScrollbarLayer;
 }
 
-namespace WebCore {
+namespace blink {
 
 class FrameHost;
 class GraphicsContext;
@@ -52,32 +54,69 @@ class GraphicsLayer;
 class GraphicsLayerFactory;
 class IntRect;
 class IntSize;
+class LocalFrame;
 
+// Represents the pinch-to-zoom viewport the user is currently seeing the page through. This
+// class corresponds to the InnerViewport on the compositor. It is a ScrollableArea; it's
+// offset is set through the GraphicsLayer <-> CC sync mechanisms. Its contents is the page's
+// main FrameView, which corresponds to the outer viewport. The inner viewport is always contained
+// in the outer viewport and can pan within it.
 class PinchViewport FINAL : public GraphicsLayerClient, public ScrollableArea {
 public:
-    PinchViewport(FrameHost&);
+    explicit PinchViewport(FrameHost&);
     virtual ~PinchViewport();
 
     void attachToLayerTree(GraphicsLayer*, GraphicsLayerFactory*);
     GraphicsLayer* rootGraphicsLayer()
     {
+        return m_rootTransformLayer.get();
+    }
+    GraphicsLayer* containerLayer()
+    {
         return m_innerViewportContainerLayer.get();
     }
 
-    void setLocation(const IntPoint&);
+    // Sets the location of the inner viewport relative to the outer viewport. The
+    // coordinates are in partial CSS pixels.
+    void setLocation(const FloatPoint&);
+    void move(const FloatPoint&);
+
+    // Sets the size of the inner viewport when unscaled in CSS pixels.
+    // This will be clamped to the size of the outer viewport (the main frame).
     void setSize(const IntSize&);
+    IntSize size() const { return m_size; }
+
+    // Resets the viewport to initial state.
+    void reset();
+
+    // Let the viewport know that the main frame changed size (either through screen
+    // rotation on Android or window resize elsewhere).
+    void mainFrameDidChangeSize();
+
+    void setScale(float);
+    float scale() const { return m_scale; }
 
     void registerLayersWithTreeView(blink::WebLayerTreeView*) const;
     void clearLayersForTreeView(blink::WebLayerTreeView*) const;
 
-    IntRect visibleRect() const { return m_visibleRect; }
+    // The portion of the unzoomed frame visible in the inner "pinch" viewport,
+    // in partial CSS pixels. Relative to the main frame.
+    FloatRect visibleRect() const;
+
+    // The viewport rect relative to the document origin, in partial CSS pixels.
+    FloatRect visibleRectInDocument() const;
+
+    // Scroll the main frame and pinch viewport so that the given rect in the
+    // top-level document is centered in the viewport. This method will avoid
+    // scrolling the pinch viewport unless necessary.
+    void scrollIntoView(const FloatRect&);
 private:
     // ScrollableArea implementation
     virtual bool isActive() const OVERRIDE { return false; }
     virtual int scrollSize(ScrollbarOrientation) const OVERRIDE;
     virtual bool isScrollCornerVisible() const OVERRIDE { return false; }
     virtual IntRect scrollCornerRect() const OVERRIDE { return IntRect(); }
-    virtual IntPoint scrollPosition() const OVERRIDE { return visibleRect().location(); }
+    virtual IntPoint scrollPosition() const OVERRIDE { return flooredIntPoint(m_offset); }
     virtual IntPoint minimumScrollPosition() const OVERRIDE;
     virtual IntPoint maximumScrollPosition() const OVERRIDE;
     virtual int visibleHeight() const OVERRIDE { return visibleRect().height(); };
@@ -101,8 +140,12 @@ private:
     virtual String debugName(const GraphicsLayer*) OVERRIDE;
 
     void setupScrollbar(blink::WebScrollbar::Orientation);
+    FloatPoint clampOffsetToBoundaries(const FloatPoint&);
+
+    LocalFrame* mainFrame() const;
 
     FrameHost& m_frameHost;
+    OwnPtr<GraphicsLayer> m_rootTransformLayer;
     OwnPtr<GraphicsLayer> m_innerViewportContainerLayer;
     OwnPtr<GraphicsLayer> m_pageScaleLayer;
     OwnPtr<GraphicsLayer> m_innerViewportScrollLayer;
@@ -111,9 +154,12 @@ private:
     OwnPtr<blink::WebScrollbarLayer> m_webOverlayScrollbarHorizontal;
     OwnPtr<blink::WebScrollbarLayer> m_webOverlayScrollbarVertical;
 
-    IntRect m_visibleRect;
+    // Offset of the pinch viewport from the main frame's origin, in CSS pixels.
+    FloatPoint m_offset;
+    float m_scale;
+    IntSize m_size;
 };
 
-} // namespace WebCore
+} // namespace blink
 
 #endif // PinchViewport_h