Have panels respond to changes in work area on Linux.

ui/base/x/active_window_watcher_x.h

 // Copyright (c) 2011 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_BASE_X_ACTIVE_WINDOW_WATCHER_X_H_
 #define UI_BASE_X_ACTIVE_WINDOW_WATCHER_X_H_
 #pragma once
 
 #include <gdk/gdk.h>
 
-#include "base/basictypes.h"

[dcheng, 2011/11/18 23:02:29]

This should remain for DISALLOW_COPY_AND_ASSIGN. This applies to all the other
.h files as well.

[prasadt, 2011/11/21 23:36:49]

Done.

 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
-#include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/ui_export.h"
+#include "ui/base/x/x11_util.h"
 
 namespace ui {
 
 // This is a helper class that is used to keep track of which window the X
-// window manager thinks is active. Add an Observer to listener for changes to
+// window manager thinks is active. Add an Observer to listen for changes to
 // the active window.
 class UI_EXPORT ActiveWindowWatcherX {
  public:
   class Observer {
    public:
     // |active_window| will be NULL if the active window isn't one of Chrome's.
     virtual void ActiveWindowChanged(GdkWindow* active_window) = 0;
 
    protected:
-    virtual ~Observer() {}
+    virtual ~Observer();
   };
 
   static ActiveWindowWatcherX* GetInstance();
-
   static void AddObserver(Observer* observer);
   static void RemoveObserver(Observer* observer);
 
+  // Gets the atom for the default display for the propert this class is

[dcheng, 2011/11/18 23:02:29]

property

[prasadt, 2011/11/21 23:36:49]

Done.

+  // watching for.
+  static Atom GetPropertyAtom();
+
+  // Notify observers that the active window has changed.
+  static void Notify();
+
   // Checks if the WM supports the active window property. Note that the return
   // value can change, especially during system startup.
   static bool WMSupportsActivation();
 
  private:
   friend struct DefaultSingletonTraits<ActiveWindowWatcherX>;
 
   ActiveWindowWatcherX();
   ~ActiveWindowWatcherX();
-
-  void Init();
-
-  // Sends a notification out through the NotificationService that the active
-  // window has changed.
   void NotifyActiveWindowChanged();
 
-  // Callback for PropertyChange XEvents.
-  CHROMEG_CALLBACK_1(ActiveWindowWatcherX, GdkFilterReturn,
-                     OnWindowXEvent, GdkXEvent*, GdkEvent*);
-
   ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ActiveWindowWatcherX);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_X_ACTIVE_WINDOW_WATCHER_X_H_