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 "ash/ash_export.h"
 #include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/base/animation/animation_delegate.h"
+#include "ui/gfx/rect.h"
 
 class SkBitmap;
 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 {
+class ASH_EXPORT FramePainter : public ui::AnimationDelegate {
  public:
   FramePainter();
-  ~FramePainter();
+  virtual ~FramePainter();
 
   // |frame| and buttons are used for layout and are not owned.
   void Init(views::Widget* frame,
             views::View* window_icon,
             views::ImageButton* maximize_button,
             views::ImageButton* close_button);
 
   // Helpers for views::NonClientFrameView implementations.
   gfx::Rect GetBoundsForClientView(int top_height,
                                    const gfx::Rect& window_bounds) const;
@@ skipping 21 matching lines @@
 
   // Paint the title bar, primarily the title string.
   void PaintTitleBar(views::NonClientFrameView* view,
                      gfx::Canvas* canvas,
                      const gfx::Font& title_font);
 
   // Performs layout for the header based on whether we want the shorter
   // |maximized_layout| appearance.
   void LayoutHeader(views::NonClientFrameView* view, bool maximized_layout);
 
+  // Overridden from ui::AnimationDelegate
+  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;
 
   // Not owned
   views::Widget* frame_;
   views::View* window_icon_;  // May be NULL.
   views::ImageButton* maximize_button_;
   views::ImageButton* close_button_;
 
   // 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_;
 
+  // The bitmap last used for painting header.
+  const SkBitmap* previous_theme_frame_;
+  // The bitmap we are crossfading from.
+  const SkBitmap* crossfade_theme_frame_;
+
+  gfx::Rect header_frame_bounds_;
+  scoped_ptr<ui::SlideAnimation> crossfade_animation_;
+
   DISALLOW_COPY_AND_ASSIGN(FramePainter);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_FRAME_PAINTER_H_