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   ~FrameCaptionButton() override;
  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 hovered_background_image_id,
  42                  int pressed_background_image_id);
  43
  44   // Returns true if the button is crossfading to new visuals set in
  45   // SetImages().
  46   bool IsAnimatingImageSwap() const;
  47
  48   // Sets the alpha to use for painting. Used to animate visibility changes.
  49   void SetAlpha(int alpha);
  50
  51   // views::View overrides:
  52   gfx::Size GetPreferredSize() const override;
  53   const char* GetClassName() const override;
  54   void OnPaint(gfx::Canvas* canvas) override;
  55
  56   void set_paint_as_active(bool paint_as_active) {
  57     paint_as_active_ = paint_as_active;
  58   }
  59
  60   CaptionButtonIcon icon() const {
  61     return icon_;
  62   }
  63
  64   int icon_image_id() const { return icon_image_id_; }
  65
  66  protected:
  67   // views::CustomButton override:
  68   void OnGestureEvent(ui::GestureEvent* event) override;
  69
  70  private:
  71   // Paints |to_center| centered within the button with |alpha|.
  72   void PaintCentered(gfx::Canvas* canvas,
  73                      const gfx::ImageSkia& to_center,
  74                      int alpha);
  75
  76   // The button's current icon.
  77   CaptionButtonIcon icon_;
  78
  79   // Whether the button should be painted as active.
  80   bool paint_as_active_;
  81
  82   // Current alpha to use for painting.
  83   int alpha_;
  84
  85   // The images and image ids used to paint the button.
  86   int icon_image_id_;
  87   int hovered_background_image_id_;
  88   int pressed_background_image_id_;
  89   gfx::ImageSkia icon_image_;
  90   gfx::ImageSkia hovered_background_image_;
  91   gfx::ImageSkia pressed_background_image_;
  92
  93   // The icon image to crossfade from.
  94   gfx::ImageSkia crossfade_icon_image_;
  95
  96   // Crossfade animation started when the button's images are changed by
  97   // SetImages().
  98   scoped_ptr<gfx::SlideAnimation> swap_images_animation_;
  99
 100   DISALLOW_COPY_AND_ASSIGN(FrameCaptionButton);
 101 };
 102
 103 }  // namespace ash
 104
 105 #endif  // ASH_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_