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/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   ~WorkspaceBackdropDelegate() override;
  36
  37   // WindowObserver overrides:
  38   void OnWindowBoundsChanged(aura::Window* window,
  39                              const gfx::Rect& old_bounds,
  40                              const gfx::Rect& new_bounds) override;
  41
  42   // WorkspaceLayoutManagerDelegate overrides:
  43   void OnWindowAddedToLayout(aura::Window* child) override;
  44   void OnWindowRemovedFromLayout(aura::Window* child) override;
  45   void OnChildWindowVisibilityChanged(aura::Window* child,
  46                                       bool visible) override;
  47   void OnWindowStackingChanged(aura::Window* window) override;
  48   void OnPostWindowStateTypeChange(wm::WindowState* window_state,
  49                                    wm::WindowStateType old_type) override;
  50   void OnDisplayWorkAreaInsetsChanged() override;
  51
  52  private:
  53   // Restack the backdrop relatively to the other windows in the container.
  54   void RestackBackdrop();
  55
  56   // Returns the current visible top level window in the container.
  57   aura::Window* GetCurrentTopWindow();
  58
  59   // Position & size the background over the container window.
  60   void AdjustToContainerBounds();
  61
  62   // Show the overlay.
  63   void Show();
  64
  65   // The background which covers the rest of the screen.
  66   views::Widget* background_;
  67
  68   // The window which is being "maximized".
  69   aura::Window* container_;
  70
  71   // If true, the |RestackOrHideWindow| might recurse.
  72   bool in_restacking_;
  73
  74   DISALLOW_COPY_AND_ASSIGN(WorkspaceBackdropDelegate);
  75 };
  76
  77 }  // namespace ash
  78
  79 #endif  // ASH_WM_MAXIMIZE_MODE_WORKSPACE_BACKDROP_DELEGATE_H_