M20 Ash: Animate window header transition from active to inactive

ash/wm/frame_painter.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_WM_FRAME_PAINTER_H_
 #define ASH_WM_FRAME_PAINTER_H_
 #pragma once
 
 #include <set>
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"  // OVERRIDE
+#include "base/memory/scoped_ptr.h"
+#include "ui/base/animation/animation_delegate.h"
+#include "ui/gfx/rect.h"
 #include "ui/aura/window_observer.h"
 
 class SkBitmap;
 namespace aura {
 class Window;
 }
 namespace gfx {
 class Canvas;
 class Font;
-class Rect;
 class Point;
 class Size;
 }
+namespace ui {
+class SlideAnimation;
+}
 namespace views {
 class ImageButton;
 class NonClientFrameView;
 class View;
 class Widget;
 }
 
 namespace ash {
 
 // Helper class for painting window frames.  Exists to share code between
 // various implementations of views::NonClientFrameView.  Canonical source of
 // layout constants for Ash window frames.
-class ASH_EXPORT FramePainter : public aura::WindowObserver {
+class ASH_EXPORT FramePainter : public aura::WindowObserver,
+                                public ui::AnimationDelegate {
  public:
   // Opacity values for the window header in various states, from 0 to 255.
   static int kActiveWindowOpacity;
   static int kInactiveWindowOpacity;
   static int kSoloWindowOpacity;
 
   enum HeaderMode {
     ACTIVE,
     INACTIVE
   };
@@ skipping 41 matching lines @@
   // Performs layout for the header based on whether we want the shorter
   // |maximized_layout| appearance.
   void LayoutHeader(views::NonClientFrameView* view, bool maximized_layout);
 
   // aura::WindowObserver overrides:
   virtual void OnWindowPropertyChanged(aura::Window* window,
                                        const void* key,
                                        intptr_t old) OVERRIDE;
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
+  // Overridden from ui::AnimationDelegate
+  virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
+
  private:
   // Sets the images for a button base on IDs from the |frame_| theme provider.
   void SetButtonImages(views::ImageButton* button,
                        int normal_bitmap_id,
                        int hot_bitmap_id,
                        int pushed_bitmap_id);
 
   // Returns the offset between window left edge and title string.
   int GetTitleOffsetX() const;
 
@@ skipping 13 matching lines @@
   aura::Window* window_;
 
   // Window frame header/caption parts.
   const SkBitmap* button_separator_;
   const SkBitmap* top_left_corner_;
   const SkBitmap* top_edge_;
   const SkBitmap* top_right_corner_;
   const SkBitmap* header_left_edge_;
   const SkBitmap* header_right_edge_;
 
+  // Bitmap and opacity last used for painting header.
+  const SkBitmap* previous_theme_frame_;
+  int previous_opacity_;
+
+  // Bitmap and opacity we are crossfading from.
+  const SkBitmap* crossfade_theme_frame_;
+  int crossfade_opacity_;
+
+  gfx::Rect header_frame_bounds_;
+  scoped_ptr<ui::SlideAnimation> crossfade_animation_;
+
   DISALLOW_COPY_AND_ASSIGN(FramePainter);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_FRAME_PAINTER_H_