gesture_nav_simple.h revision 03b57e008b61dfcb1fbad3aea950ae0e001748b0 
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
11namespace gfx {
12class Transform;
13}
14
15namespace ui {
16class Layer;
17}
18
19namespace content {
20
21class ArrowLayerDelegate;
22class 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.
26class 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  bool ApplyEffectsForDelta(float delta_x);
36
37  // OverscrollControllerDelegate:
38  virtual gfx::Rect GetVisibleBounds() const OVERRIDE;
39  // Returns true if the scroll update was consumed.
40  virtual bool OnOverscrollUpdate(float delta_x, float delta_y) OVERRIDE;
41  virtual void OnOverscrollComplete(OverscrollMode overscroll_mode) OVERRIDE;
42  virtual void OnOverscrollModeChange(OverscrollMode old_mode,
43                                      OverscrollMode new_mode) OVERRIDE;
44
45  WebContentsImpl* web_contents_;
46  scoped_ptr<ui::Layer> clip_layer_;
47  scoped_ptr<ui::Layer> arrow_;
48  scoped_ptr<ArrowLayerDelegate> arrow_delegate_;
49  float completion_threshold_;
50
51  DISALLOW_COPY_AND_ASSIGN(GestureNavSimple);
52};
53
54}  // namespace content
55
56#endif  // CONTENT_BROWSER_WEB_CONTENTS_AURA_GESTURE_NAV_SIMPLE_H_
57