ash/shelf/shelf_window_watcher.h

   1 // Copyright 2013 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_SHELF_SHELF_WINDOW_WATCHER_H_
   6 #define ASH_SHELF_SHELF_WINDOW_WATCHER_H_
   7
   8 #include "ash/shelf/scoped_observer_with_duplicated_sources.h"
   9 #include "base/basictypes.h"
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/scoped_observer.h"
  13 #include "ui/aura/window_observer.h"
  14 #include "ui/gfx/display_observer.h"
  15 #include "ui/wm/public/activation_change_observer.h"
  16
  17 namespace aura {
  18
  19 class Window;
  20
  21 namespace client {
  22 class ActivationClient;
  23 }
  24
  25 }  // namespace aura
  26
  27 namespace ash {
  28
  29 class ShelfModel;
  30 class ShelfItemDelegateManager;
  31
  32 // ShelfWindowWatcher creates and handles a ShelfItem for windows that have
  33 // a ShelfItemDetails property in the default container.
  34 class ShelfWindowWatcher : public aura::client::ActivationChangeObserver,
  35                            public aura::WindowObserver,
  36                            public gfx::DisplayObserver {
  37  public:
  38   ShelfWindowWatcher(ShelfModel* model,
  39                      ShelfItemDelegateManager* item_delegate_manager);
  40   ~ShelfWindowWatcher() override;
  41
  42  private:
  43   class RootWindowObserver : public aura::WindowObserver {
  44    public:
  45     explicit RootWindowObserver(ShelfWindowWatcher* window_watcher);
  46     ~RootWindowObserver() override;
  47
  48    private:
  49     // aura::WindowObserver overrides:
  50     void OnWindowDestroying(aura::Window* window) override;
  51
  52     // Owned by Shell.
  53     ShelfWindowWatcher* window_watcher_;
  54
  55     DISALLOW_COPY_AND_ASSIGN(RootWindowObserver);
  56   };
  57
  58   // Used to track windows that are removed. See description of
  59   // ShelfWindowWatcher::StartObservingRemovedWindow() for more details.
  60   class RemovedWindowObserver : public aura::WindowObserver {
  61    public:
  62     explicit RemovedWindowObserver(ShelfWindowWatcher* window_watcher);
  63     ~RemovedWindowObserver() override;
  64
  65    private:
  66     // aura::WindowObserver overrides:
  67     void OnWindowParentChanged(aura::Window* window,
  68                                aura::Window* parent) override;
  69     void OnWindowDestroyed(aura::Window* window) override;
  70
  71     // Owned by Shell.
  72     ShelfWindowWatcher* window_watcher_;
  73
  74     DISALLOW_COPY_AND_ASSIGN(RemovedWindowObserver);
  75   };
  76
  77   // Creates a ShelfItem for |window| that has ShelfItemDetails.
  78   void AddShelfItem(aura::Window* window);
  79
  80   // Removes a ShelfItem for |window|.
  81   void RemoveShelfItem(aura::Window* window);
  82
  83   // Adds observer to default container and ActivationClient of |root_window|.
  84   void OnRootWindowAdded(aura::Window* root_window);
  85
  86   // Removes observer from ActivationClient of |root_window|.
  87   void OnRootWindowRemoved(aura::Window* root_window);
  88
  89   // Updates the status of ShelfItem for |window|.
  90   void UpdateShelfItemStatus(aura::Window* window, bool is_active);
  91
  92   // Returns the index of ShelfItem associated with |window|.
  93   int GetShelfItemIndexForWindow(aura::Window* window) const;
  94
  95   // Used when a window is removed. During the dragging a window may be removed
  96   // and when the drag completes added back. When this happens we don't want to
  97   // remove the shelf item. StartObservingRemovedWindow, if necessary, attaches
  98   // an observer. When done, FinishObservingRemovedWindow() is invoked.
  99   void StartObservingRemovedWindow(aura::Window* window);
 100
 101   // Stop observing |window| by RemovedWindowObserver and remove an item
 102   // associated with |window|.
 103   void FinishObservingRemovedWindow(aura::Window* window);
 104
 105   // aura::client::ActivationChangeObserver overrides:
 106   void OnWindowActivated(
 107       aura::client::ActivationChangeObserver::ActivationReason reason,
 108       aura::Window* gained_active,
 109       aura::Window* lost_active) override;
 110
 111   // aura::WindowObserver overrides:
 112   void OnWindowAdded(aura::Window* window) override;
 113   void OnWillRemoveWindow(aura::Window* window) override;
 114   void OnWindowDestroying(aura::Window* window) override;
 115   void OnWindowPropertyChanged(aura::Window* window,
 116                                const void* key,
 117                                intptr_t old) override;
 118
 119   // gfx::DisplayObserver overrides:
 120   void OnDisplayAdded(const gfx::Display& display) override;
 121   void OnDisplayRemoved(const gfx::Display& old_display) override;
 122   void OnDisplayMetricsChanged(const gfx::Display& display,
 123                                uint32_t metrics) override;
 124
 125   // Owned by Shell.
 126   ShelfModel* model_;
 127   ShelfItemDelegateManager* item_delegate_manager_;
 128
 129   RootWindowObserver root_window_observer_;
 130
 131   RemovedWindowObserver removed_window_observer_;
 132
 133   // Holds all observed windows.
 134   ScopedObserver<aura::Window, aura::WindowObserver> observed_windows_;
 135
 136   // Holds all observed root windows.
 137   ScopedObserver<aura::Window, aura::WindowObserver> observed_root_windows_;
 138
 139   // Holds removed windows that has an item from default container.
 140   ScopedObserver<aura::Window, aura::WindowObserver> observed_removed_windows_;
 141
 142   // Holds all observed activation clients.
 143   ScopedObserverWithDuplicatedSources<aura::client::ActivationClient,
 144       aura::client::ActivationChangeObserver> observed_activation_clients_;
 145
 146   DISALLOW_COPY_AND_ASSIGN(ShelfWindowWatcher);
 147 };
 148
 149 }  // namespace ash
 150
 151 #endif  // ASH_SHELF_SHELF_WINDOW_WATCHER_H_