mash: Move ShelfWindowWatcher[ItemDelegate] to ash/common.

ash/shelf/shelf_window_watcher.h

-// Copyright 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_SHELF_SHELF_WINDOW_WATCHER_H_
-#define ASH_SHELF_SHELF_WINDOW_WATCHER_H_
-
-#include "ash/common/wm_activation_observer.h"
-#include "ash/common/wm_window_observer.h"
-#include "base/macros.h"
-#include "base/scoped_observer.h"
-#include "ui/display/display_observer.h"
-
-namespace ash {
-
-class ShelfModel;
-class WmWindow;
-
-// ShelfWindowWatcher creates and handles a ShelfItem for windows in the default
-// container that have a ShelfItemDetails property (e.g. the task manager
-// dialog or the OS settings window). It adds the ShelfItem when the window is
-// added to the default container and maintains it until the window is closed,
-// even if the window is transiently reparented (e.g. during a drag).
-class ShelfWindowWatcher : public WmActivationObserver,
-                           public display::DisplayObserver {
- public:
-  explicit ShelfWindowWatcher(ShelfModel* model);
-  ~ShelfWindowWatcher() override;
-
- private:
-  // Observes for windows being added to a root window's default container.
-  class ContainerWindowObserver : public WmWindowObserver {
-   public:
-    explicit ContainerWindowObserver(ShelfWindowWatcher* window_watcher);
-    ~ContainerWindowObserver() override;
-
-   private:
-    // WmWindowObserver:
-    void OnWindowTreeChanged(WmWindow* window,
-                             const TreeChangeParams& params) override;
-    void OnWindowDestroying(WmWindow* window) override;
-
-    ShelfWindowWatcher* window_watcher_;
-
-    DISALLOW_COPY_AND_ASSIGN(ContainerWindowObserver);
-  };
-
-  // Observes individual user windows to detect when they are closed or when
-  // they have ShelfItemDetails changed.
-  class UserWindowObserver : public WmWindowObserver {
-   public:
-    explicit UserWindowObserver(ShelfWindowWatcher* window_watcher);
-    ~UserWindowObserver() override;
-
-   private:
-    // WmWindowObserver:
-    void OnWindowPropertyChanged(WmWindow* window,
-                                 WmWindowProperty property) override;
-    void OnWindowDestroying(WmWindow* window) override;
-
-    ShelfWindowWatcher* window_watcher_;
-
-    DISALLOW_COPY_AND_ASSIGN(UserWindowObserver);
-  };
-
-  // Creates a ShelfItem for |window| that has ShelfItemDetails.
-  void AddShelfItem(WmWindow* window);
-
-  // Removes a ShelfItem for |window|.
-  void RemoveShelfItem(WmWindow* window);
-
-  // Updates the status of ShelfItem for |window|.
-  void UpdateShelfItemStatus(WmWindow* window, bool is_active);
-
-  // Returns the index of ShelfItem associated with |window|.
-  int GetShelfItemIndexForWindow(WmWindow* window) const;
-
-  // Cleans up observers on |container|.
-  void OnContainerWindowDestroying(WmWindow* container);
-
-  // Adds a shelf item for new windows added to the default container that have
-  // a ShelfItemDetails property.
-  void OnUserWindowAdded(WmWindow* window);
-
-  // Adds, updates or removes the shelf item based on a property change.
-  void OnUserWindowShelfItemDetailsChanged(WmWindow* window);
-
-  // Removes the shelf item when a window closes.
-  void OnUserWindowDestroying(WmWindow* window);
-
-  // WmActivationObserver:
-  void OnWindowActivated(WmWindow* gained_active,
-                         WmWindow* lost_active) override;
-
-  // display::DisplayObserver overrides:
-  void OnDisplayAdded(const display::Display& display) override;
-  void OnDisplayRemoved(const display::Display& old_display) override;
-  void OnDisplayMetricsChanged(const display::Display& display,
-                               uint32_t metrics) override;
-
-  ShelfModel* model_;
-
-  ContainerWindowObserver container_window_observer_;
-  UserWindowObserver user_window_observer_;
-
-  ScopedObserver<WmWindow, ContainerWindowObserver> observed_container_windows_;
-  ScopedObserver<WmWindow, UserWindowObserver> observed_user_windows_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShelfWindowWatcher);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SHELF_SHELF_WINDOW_WATCHER_H_