Add support for XFWM titlebar buttons.

chrome/browser/ui/gtk/titlebar_listener.h

Index: chrome/browser/ui/gtk/titlebar_listener.h
===================================================================
--- chrome/browser/ui/gtk/titlebar_listener.h	(revision 0)
+++ chrome/browser/ui/gtk/titlebar_listener.h	(revision 0)
@@ -0,0 +1,71 @@
+// Copyright (c) 2012 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 CHROME_BROWSER_UI_GTK_TITLEBAR_LISTENER_H_
+#define CHROME_BROWSER_UI_GTK_TITLEBAR_LISTENER_H_
+
+#include <set>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+
+class BrowserTitlebar;
+template <typename T> struct DefaultSingletonTraits;
+
+// Meant to be used as a Singleton through base/memory/singleton.h's interface.
+class TitlebarListener {
+ public:
+  // Class to handle window manager specific changes to the button order.
+  class Delegate : public base::RefCountedThreadSafe<Delegate> {
+   public:
+    // Do all necessary initialization here. If initialization succeeds,
+    // return true. Otherwise return false and TitlebarListener will try a
+    // different Delegate if one is available and applicable.
+    virtual bool Init() = 0;
+
+    // Returns the current button order.
+    virtual std::string GetCurrentValue() = 0;
+
+   protected:
+    virtual ~Delegate() {}
+
+   private:
+    friend class base::RefCountedThreadSafe<Delegate>;
+  };
+
+  // Returns the singleton instance.
+  static TitlebarListener* GetInstance();
+
+  // Sets the current titlebar button order. Also subscribes to further
+  // notifications when the titlebar button order changes on supported
+  // desktop environments.
+  void SetTitlebarButtons(BrowserTitlebar* titlebar);
+
+  // Removes |titlebar| from the list of objects observing button order change
+  // notifications.
+  void RemoveObserver(BrowserTitlebar* titlebar);
+
+  // Sets all title bars that have subscribed to updates to |title_value|.
+  void SetTitleBars(const std::string& title_value);
+
+ protected:
+  ~TitlebarListener();
+
+ private:
+  friend struct DefaultSingletonTraits<TitlebarListener>;
+
+  // Private constructor to enforce singleton access.
+  TitlebarListener();
+
+  // The window manager specific delagate.
+  scoped_refptr<Delegate> delegate_;
+
+  // BrowserTitlebar objects which have subscribed to updates.
+  std::set<BrowserTitlebar*> titlebars_;
+
+  DISALLOW_COPY_AND_ASSIGN(TitlebarListener);
+};
+
+#endif  // CHROME_BROWSER_UI_GTK_TITLEBAR_LISTENER_H_
Property changes on: chrome/browser/ui/gtk/titlebar_listener.h
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Added: svn:eol-style
   + LF