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      1 // Copyright 2014 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_WM_MAXIMIZE_MODE_WORKSPACE_BACKDROP_DELEGATE_H_
      6 #define ASH_WM_MAXIMIZE_MODE_WORKSPACE_BACKDROP_DELEGATE_H_
      7 
      8 #include "ash/ash_export.h"
      9 #include "ash/wm/workspace/workspace_layout_manager_delegate.h"
     10 #include "base/compiler_specific.h"
     11 #include "ui/aura/window_observer.h"
     12 
     13 namespace aura {
     14 class Window;
     15 }
     16 
     17 namespace ui {
     18 class Layer;
     19 }
     20 
     21 namespace views {
     22 class Widget;
     23 }
     24 
     25 namespace ash {
     26 
     27 // A background which gets created for a container |window| and which gets
     28 // stacked behind the topmost window (within that container) covering the
     29 // entire container.
     30 class ASH_EXPORT WorkspaceBackdropDelegate
     31     : public aura::WindowObserver,
     32       public NON_EXPORTED_BASE(WorkspaceLayoutManagerDelegate) {
     33  public:
     34   explicit WorkspaceBackdropDelegate(aura::Window* container);
     35   virtual ~WorkspaceBackdropDelegate();
     36 
     37   // WindowObserver overrides:
     38   virtual void OnWindowBoundsChanged(aura::Window* window,
     39                                      const gfx::Rect& old_bounds,
     40                                      const gfx::Rect& new_bounds) OVERRIDE;
     41 
     42   // WorkspaceLayoutManagerDelegate overrides:
     43   virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
     44   virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE;
     45   virtual void OnChildWindowVisibilityChanged(aura::Window* child,
     46                                               bool visible) OVERRIDE;
     47   virtual void OnWindowStackingChanged(aura::Window* window) OVERRIDE;
     48   virtual void OnPostWindowStateTypeChange(
     49       wm::WindowState* window_state,
     50       wm::WindowStateType old_type) OVERRIDE;
     51   virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE;
     52 
     53  private:
     54   // Restack the backdrop relatively to the other windows in the container.
     55   void RestackBackdrop();
     56 
     57   // Returns the current visible top level window in the container.
     58   aura::Window* GetCurrentTopWindow();
     59 
     60   // Position & size the background over the container window.
     61   void AdjustToContainerBounds();
     62 
     63   // Show the overlay.
     64   void Show();
     65 
     66   // The background which covers the rest of the screen.
     67   views::Widget* background_;
     68 
     69   // The window which is being "maximized".
     70   aura::Window* container_;
     71 
     72   // If true, the |RestackOrHideWindow| might recurse.
     73   bool in_restacking_;
     74 
     75   DISALLOW_COPY_AND_ASSIGN(WorkspaceBackdropDelegate);
     76 };
     77 
     78 }  // namespace ash
     79 
     80 #endif  // ASH_WM_MAXIMIZE_MODE_WORKSPACE_BACKDROP_DELEGATE_H_
     81