Animating docked background in sync with shelf

ash/wm/dock/docked_window_layout_manager.h

 // Copyright (c) 2013 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_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_H_
 #define ASH_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_H_
 
 #include "ash/ash_export.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
 #include "ash/shell_observer.h"
@@ skipping 23 matching lines @@
 }
 
 namespace views {
 class Widget;
 }
 
 namespace ash {
 class Launcher;
 
 namespace internal {
+class DockedBackgroundWidget;
 class DockedWindowLayoutManagerObserver;
 class DockedWindowResizerTest;
 class ShelfLayoutManager;
 class WorkspaceController;
 
 struct WindowWithHeight {
   explicit WindowWithHeight(aura::Window* window) :
     window_(window),
     height_(window->bounds().height()) { }
   aura::Window* window() { return window_; }
@@ skipping 13 matching lines @@
 //     new DockedWindowLayoutManager(dock_container));
 //
 // TODO(varkha): extend BaseLayoutManager instead of LayoutManager to inherit
 // common functionality.
 class ASH_EXPORT DockedWindowLayoutManager
     : public aura::LayoutManager,
       public ash::ShellObserver,
       public aura::WindowObserver,
       public aura::client::ActivationChangeObserver,
       public keyboard::KeyboardControllerObserver,
+      public ShelfLayoutManagerObserver,
       public wm::WindowStateObserver {
  public:
   // Maximum width of the docked windows area.
   static const int kMaxDockWidth;
 
   // Minimum width of the docked windows area.
   static const int kMinDockWidth;
 
   DockedWindowLayoutManager(aura::Window* dock_container,
                             WorkspaceController* workspace_controller);
@@ skipping 54 matching lines @@
                                               bool visibile) OVERRIDE;
   virtual void SetChildBounds(aura::Window* child,
                               const gfx::Rect& requested_bounds) OVERRIDE;
 
   // ash::ShellObserver:
   virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE;
   virtual void OnFullscreenStateChanged(bool is_fullscreen,
                                         aura::Window* root_window) OVERRIDE;
   virtual void OnShelfAlignmentChanged(aura::Window* root_window) OVERRIDE;
 
+  // ShelfLayoutManagerObserver:
+  virtual void OnBackgroundUpdated(
+      ShelfBackgroundType background_type,
+      BackgroundAnimatorChangeType change_type) OVERRIDE;
+
   // wm::WindowStateObserver:
   virtual void OnWindowShowTypeChanged(wm::WindowState* window_state,
                                        wm::WindowShowType old_type) OVERRIDE;
 
   // aura::WindowObserver:
   virtual void OnWindowBoundsChanged(aura::Window* window,
                                      const gfx::Rect& old_bounds,
                                      const gfx::Rect& new_bounds) OVERRIDE;
   virtual void OnWindowVisibilityChanging(aura::Window* window,
                                           bool visible) OVERRIDE;
@@ skipping 87 matching lines @@
   // True if the window being dragged is currently docked.
   bool is_dragged_window_docked_;
 
   // Previously docked windows use a more relaxed dragging sorting algorithm
   // that uses assumption that a window starts being dragged out of position
   // that was previously established in Relayout. This allows easier reordering.
   bool is_dragged_from_dock_;
 
   // The launcher to respond to launcher alignment changes.
   Launcher* launcher_;
+
   // Workspace controller that can be checked for fullscreen mode.
   WorkspaceController* workspace_controller_;
   // Tracks if any window in the same root window is in fullscreen mode.
   bool in_fullscreen_;
   // Current width of the dock.
   int docked_width_;
 
   // Last bounds that were sent to observers.
   gfx::Rect docked_bounds_;
 
   // Target bounds of a docked window being dragged.
   gfx::Rect dragged_bounds_;
 
   // Side of the screen that the dock is positioned at.
   DockedAlignment alignment_;
 
   // The last active window. Used to maintain stacking order even if no windows
   // are currently focused.
   aura::Window* last_active_window_;
 
   // Timestamp of the last user-initiated action that changed docked state.
   // Used in UMA metrics.
   base::Time last_action_time_;
 
   // Widget used to paint a background for the docked area.
-  scoped_ptr<views::Widget> background_widget_;
+  scoped_ptr<DockedBackgroundWidget> background_widget_;
 
   // Observers of dock bounds changes.
   ObserverList<DockedWindowLayoutManagerObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(DockedWindowLayoutManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_H_