Insert pinch zoom virtual viewport layers to graphics layer tree.

Source/WebKit/chromium/src/PinchViewports.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR 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 WebUserGestureToken_h
-#define WebUserGestureToken_h
+#ifndef PinchViewports_h
+#define PinchViewports_h
 
-#include "../platform/WebPrivatePtr.h"
+#include "core/platform/graphics/FloatSize.h"
+#include "public/platform/WebScrollbar.h"
+#include "public/platform/WebSize.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
-class UserGestureToken;
+class GraphicsLayer;
 }
 
 namespace WebKit {
 
-// A WebUserGestureToken allows for storing the user gesture state of the
-// currently active context and reinstantiating it later on to continue
-// processing the user gesture in case it was not consumed meanwhile.
-class WebUserGestureToken {
+class WebScrollbarLayer;
+class WebViewImpl;
+
+using namespace WebCore;
+
+class PinchViewports {
 public:
-    WebUserGestureToken() { }
-    WebUserGestureToken(const WebUserGestureToken& other) { assign(other); }
-    WebUserGestureToken& operator=(const WebUserGestureToken& other)
-    {
-        assign(other);
-        return *this;
-    }
-    ~WebUserGestureToken() { reset(); }
+    static WTF::PassOwnPtr<PinchViewports> create(WebViewImpl* owner);
+    ~PinchViewports();
 
-    WEBKIT_EXPORT bool hasGestures() const;
-    bool isNull() const { return m_token.isNull(); }
+    void setOverflowControlsHostLayer(GraphicsLayer*);
+    GraphicsLayer* rootGraphicsLayer() { return m_innerViewportClipLayer.get(); }

[trchen, 2013/06/13 21:11:54]

nits: 80 chars

[wjmaclean, 2013/06/14 15:54:16]

Done.

+    void setViewportSize(const FloatSize&);
+    void showGraphicsLayers();
 
-#if WEBKIT_IMPLEMENTATION
-    explicit WebUserGestureToken(PassRefPtr<WebCore::UserGestureToken>);
-    operator PassRefPtr<WebCore::UserGestureToken>() const;
-#endif
+protected:
+    const static size_t kOverlayScrollbarThickness;

[trchen, 2013/06/13 21:11:54]

Should we make it a WebSettings?

[wjmaclean, 2013/06/14 15:54:16]

Sure, seems reasonable.

 
-private:
-    WEBKIT_EXPORT void assign(const WebUserGestureToken&);
-    WEBKIT_EXPORT void reset();
+    PinchViewports(WebViewImpl* owner);
 
-    WebPrivatePtr<WebCore::UserGestureToken> m_token;
+    void setupScrollbar(WebKit::WebScrollbar::Orientation);
+
+    WebViewImpl* m_owner;
+    WTF::OwnPtr<GraphicsLayer> m_innerViewportClipLayer;
+    WTF::OwnPtr<GraphicsLayer> m_pageScaleLayer;
+    WTF::OwnPtr<GraphicsLayer> m_innerViewportScrollLayer;
+    WTF::OwnPtr<GraphicsLayer> m_overlayScrollbarHorizontal;
+    WTF::OwnPtr<GraphicsLayer> m_overlayScrollbarVertical;
+    WTF::OwnPtr<WebScrollbarLayer> m_webScrollbarLayerHorizontal;
+    WTF::OwnPtr<WebScrollbarLayer> m_webScrollbarLayerVertical;
 };
 
 } // namespace WebKit
 
-#endif // WebUserGestureToken_h
+#endif // PinchViewports_h