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1 // Copyright (c) 2012 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 ASH_SCREEN_ROTATION_H_
6 #define ASH_SCREEN_ROTATION_H_
7 
8 #include "ash/ash_export.h"
9 #include "base/basictypes.h"
10 #include "base/memory/scoped_ptr.h"
11 #include "ui/compositor/layer_animation_element.h"
12 #include "ui/gfx/point.h"
13 
14 namespace ui {
15 class InterpolatedTransform;
16 class Layer;
17 }
18 
19 namespace aura {
20 class RootWindow;
21 }
22 
23 namespace ash {
24 
25 // A screen rotation represents a single transition from one screen orientation
26 // to another. The  intended usage is that a new instance of the class is
27 // created for every transition. It is possible to update the target orientation
28 // in the middle of a transition.
29 class ASH_EXPORT ScreenRotation : public ui::LayerAnimationElement {
30  public:
31   // |degrees| are clockwise. |layer| is the target of the animation. Does not
32   // take ownership of |layer|.
33   ScreenRotation(int degrees, ui::Layer* layer);
34   virtual ~ScreenRotation();
35 
36  private:
37   // Generates the intermediate transformation matrices used during the
38   // animation.
39   void InitTransform(ui::Layer* layer);
40 
41   // Implementation of ui::LayerAnimationDelegate
42   virtual void OnStart(ui::LayerAnimationDelegate* delegate) OVERRIDE;
43   virtual bool OnProgress(double t,
44                           ui::LayerAnimationDelegate* delegate) OVERRIDE;
45   virtual void OnGetTarget(TargetValue* target) const OVERRIDE;
46   virtual void OnAbort(ui::LayerAnimationDelegate* delegate) OVERRIDE;
47 
48   static const ui::LayerAnimationElement::AnimatableProperties&
49       GetProperties();
50 
51   scoped_ptr<ui::InterpolatedTransform> interpolated_transform_;
52 
53   // The number of degrees to rotate.
54   int degrees_;
55 
56   // The target origin.
57   gfx::Point new_origin_;
58 
59   DISALLOW_COPY_AND_ASSIGN(ScreenRotation);
60 };
61 
62 }  // namespace ash
63 
64 #endif  // ASH_SCREEN_ROTATION_H_
65