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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_WEB_CONTENTS_AURA_GESTURE_NAV_SIMPLE_H_
      6 #define CONTENT_BROWSER_WEB_CONTENTS_AURA_GESTURE_NAV_SIMPLE_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "content/browser/renderer_host/overscroll_controller_delegate.h"
     10 
     11 namespace gfx {
     12 class Transform;
     13 }
     14 
     15 namespace ui {
     16 class Layer;
     17 }
     18 
     19 namespace content {
     20 
     21 class ArrowLayerDelegate;
     22 class WebContentsImpl;
     23 
     24 // A simple delegate for the overscroll controller that paints an arrow on top
     25 // of the web-contents as a hint for pending navigations from overscroll.
     26 class GestureNavSimple : public OverscrollControllerDelegate {
     27  public:
     28   explicit GestureNavSimple(WebContentsImpl* web_contents);
     29   virtual ~GestureNavSimple();
     30 
     31  private:
     32   void ApplyEffectsAndDestroy(const gfx::Transform& transform, float opacity);
     33   void AbortGestureAnimation();
     34   void CompleteGestureAnimation();
     35   void ApplyEffectsForDelta(float delta_x);
     36 
     37   // OverscrollControllerDelegate:
     38   virtual gfx::Rect GetVisibleBounds() const OVERRIDE;
     39   virtual void OnOverscrollUpdate(float delta_x, float delta_y) OVERRIDE;
     40   virtual void OnOverscrollComplete(OverscrollMode overscroll_mode) OVERRIDE;
     41   virtual void OnOverscrollModeChange(OverscrollMode old_mode,
     42                                       OverscrollMode new_mode) OVERRIDE;
     43 
     44   WebContentsImpl* web_contents_;
     45   scoped_ptr<ui::Layer> clip_layer_;
     46   scoped_ptr<ui::Layer> arrow_;
     47   scoped_ptr<ArrowLayerDelegate> arrow_delegate_;
     48   float completion_threshold_;
     49 
     50   DISALLOW_COPY_AND_ASSIGN(GestureNavSimple);
     51 };
     52 
     53 }  // namespace content
     54 
     55 #endif  // CONTENT_BROWSER_WEB_CONTENTS_AURA_GESTURE_NAV_SIMPLE_H_
     56