ash/frame/caption_buttons/frame_caption_button.h

   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
  14 namespace gfx {
  15 class SlideAnimation;
  16 }
  17
  18 namespace ash {
  19
  20 // Base class for the window caption buttons (minimize, maximize, restore,
  21 // close).
  22 class 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_