ash/wm/maximize_mode/workspace_backdrop_delegate.h

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