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      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_
    110