Moves transient window observer methods out of WindowObserver

ui/views/corewm/transient_window_manager.h

 // Copyright 2014 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 UI_VIEWS_COREWM_TRANSIENT_WINDOW_MANAGER_H_
 #define UI_VIEWS_COREWM_TRANSIENT_WINDOW_MANAGER_H_
 
 #include <vector>
 
+#include "base/observer_list.h"
 #include "ui/aura/window_observer.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 namespace corewm {
 
+class TransientWindowObserver;
+
 // TransientWindowManager manages the set of transient children for a window
 // along with the transient parent. Transient children get the following
 // behavior:
 // . The transient parent destroys any transient children when it is
 //   destroyed. This means a transient child is destroyed if either its parent
 //   or transient parent is destroyed.
 // . If a transient child and its transient parent share the same parent, then
 //   transient children are always ordered above the transient parent.
 // Transient windows are typically used for popups and menus.
 // TODO(sky): when we nuke TransientWindowClient rename this to
 // TransientWindowController.
 class VIEWS_EXPORT TransientWindowManager : public aura::WindowObserver {
  public:
   typedef std::vector<aura::Window*> Windows;
 
   virtual ~TransientWindowManager();
 
   // Returns the TransientWindowManager for |window|. This never returns NULL.
   static TransientWindowManager* Get(aura::Window* window);
 
   // Returns the TransientWindowManager for |window| only if it already exists.
   // WARNING: this may return NULL.
   static const TransientWindowManager* Get(const aura::Window* window);
 
+  void AddObserver(TransientWindowObserver* observer);
+  void RemoveObserver(TransientWindowObserver* observer);
+
   // Adds or removes a transient child.
   void AddTransientChild(aura::Window* child);
   void RemoveTransientChild(aura::Window* child);
 
   const Windows& transient_children() const { return transient_children_; }
 
   aura::Window* transient_parent() { return transient_parent_; }
   const aura::Window* transient_parent() const { return transient_parent_; }
 
   // Returns true if in the process of stacking |child| on top of |target|. That
@@ skipping 30 matching lines @@
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   aura::Window* window_;
   aura::Window* transient_parent_;
   Windows transient_children_;
 
   // If non-null we're actively restacking transient as the result of a
   // transient ancestor changing. This is a pointer to a value on the stack.
   StackingPair* stacking_pair_;
 
+  ObserverList<TransientWindowObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(TransientWindowManager);
 };
 
 }  // namespace corewm
 }  // namespace views
 
 #endif  // UI_VIEWS_COREWM_TRANSIENT_WINDOW_MANAGER_H_