1// Copyright 2013 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_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_
6#define ASH_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_
7
8#include "ash/ash_export.h"
9#include "ash/frame/caption_buttons/caption_button_types.h"
10#include "base/memory/scoped_ptr.h"
11#include "ui/gfx/image/image_skia.h"
12#include "ui/views/controls/button/custom_button.h"
13
14namespace gfx {
15class SlideAnimation;
16}
17
18namespace ash {
19
20// Base class for the window caption buttons (minimize, maximize, restore,
21// close).
22class ASH_EXPORT FrameCaptionButton : public views::CustomButton {
23 public:
24  enum Animate {
25    ANIMATE_YES,
26    ANIMATE_NO
27  };
28
29  static const char kViewClassName[];
30
31  FrameCaptionButton(views::ButtonListener* listener, CaptionButtonIcon icon);
32  virtual ~FrameCaptionButton();
33
34  // Sets the images to use to paint the button. If |animate| is ANIMATE_YES,
35  // the button crossfades to the new visuals. If the image ids match those
36  // currently used by the button and |animate| is ANIMATE_NO the crossfade
37  // animation is progressed to the end.
38  void SetImages(CaptionButtonIcon icon,
39                 Animate animate,
40                 int icon_image_id,
41                 int inactive_icon_image_id,
42                 int hovered_background_image_id,
43                 int pressed_background_image_id);
44
45  // Returns true if the button is crossfading to new visuals set in
46  // SetImages().
47  bool IsAnimatingImageSwap() const;
48
49  // Sets the alpha to use for painting. Used to animate visibility changes.
50  void SetAlpha(int alpha);
51
52  // views::View overrides:
53  virtual gfx::Size GetPreferredSize() const OVERRIDE;
54  virtual const char* GetClassName() const OVERRIDE;
55  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
56
57  void set_paint_as_active(bool paint_as_active) {
58    paint_as_active_ = paint_as_active;
59  }
60
61  CaptionButtonIcon icon() const {
62    return icon_;
63  }
64
65 protected:
66  // views::CustomButton override:
67  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
68
69 private:
70  // Returns the icon image to paint based on |paint_as_active_|.
71  const gfx::ImageSkia& GetIconImageToPaint() const;
72
73  // Paints |to_center| centered within the button with |alpha|.
74  void PaintCentered(gfx::Canvas* canvas,
75                     const gfx::ImageSkia& to_center,
76                     int alpha);
77
78  // The button's current icon.
79  CaptionButtonIcon icon_;
80
81  // Whether the button should be painted as active.
82  bool paint_as_active_;
83
84  // Current alpha to use for painting.
85  int alpha_;
86
87  // The images and image ids used to paint the button.
88  int icon_image_id_;
89  int inactive_icon_image_id_;
90  int hovered_background_image_id_;
91  int pressed_background_image_id_;
92  gfx::ImageSkia icon_image_;
93  gfx::ImageSkia inactive_icon_image_;
94  gfx::ImageSkia hovered_background_image_;
95  gfx::ImageSkia pressed_background_image_;
96
97  // The icon image to crossfade from.
98  gfx::ImageSkia crossfade_icon_image_;
99
100  // Crossfade animation started when the button's images are changed by
101  // SetImages().
102  scoped_ptr<gfx::SlideAnimation> swap_images_animation_;
103
104  DISALLOW_COPY_AND_ASSIGN(FrameCaptionButton);
105};
106
107}  // namespace ash
108
109#endif  // ASH_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_
110