Fix issue 19081: Linux: Not able to switch input method correctly in web page...

chrome/browser/renderer_host/gtk_im_context_wrapper.h

 // Copyright (c) 2009 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_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_
 #define CHROME_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_
 
 #include <gdk/gdk.h>
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 
 namespace gfx {
 class Rect;
 }
 
 class RenderWidgetHostViewGtk;
 class NativeWebKeyboardEvent;
 typedef struct _GtkIMContext GtkIMContext;
+typedef struct _GtkWidget GtkWidget;
 
 // This class is a convenience wrapper for GtkIMContext.
 // It creates and manages two GtkIMContext instances, one is GtkIMMulticontext,
 // for plain text input box, another is GtkIMContextSimple, for password input
 // box.
 //
 // This class is in charge of dispatching key events to these two GtkIMContext
 // instances and handling signals emitted by them. Key events then will be
 // forwarded to renderer along with input method results via corresponding host
 // view.
@@ skipping 31 matching lines @@
 
   // Real code of "preedit-start" signal handler.
   void HandlePreeditStart();
 
   // Real code of "preedit-changed" signal handler.
   void HandlePreeditChanged(const string16& text, int cursor_position);
 
   // Real code of "preedit-end" signal handler.
   void HandlePreeditEnd();
 
+  // Real code of "realize" signal handler, used for setting im context's client
+  // window.
+  void HandleHostViewRealize(GtkWidget* widget);
+
+  // Real code of "unrealize" signal handler, used for unsetting im context's
+  // client window.
+  void HandleHostViewUnrealize();
+
   // Signal handlers of GtkIMContext object.
   static void HandleCommitThunk(GtkIMContext* context, gchar* text,
                                 GtkIMContextWrapper* self);
   static void HandlePreeditStartThunk(GtkIMContext* context,
                                       GtkIMContextWrapper* self);
   static void HandlePreeditChangedThunk(GtkIMContext* context,
                                         GtkIMContextWrapper* self);
   static void HandlePreeditEndThunk(GtkIMContext* context,
                                     GtkIMContextWrapper* self);
 
+  // Signal handlers connecting to |host_view_|'s native view widget.
+  static void HandleHostViewRealizeThunk(GtkWidget* widget,
+                                         GtkIMContextWrapper* self);
+  static void HandleHostViewUnrealizeThunk(GtkWidget* widget,
+                                           GtkIMContextWrapper* self);
+
   // The parent object.
   RenderWidgetHostViewGtk* host_view_;
 
   // The GtkIMContext object.
   // In terms of the DOM event specification Appendix A
   //   <http://www.w3.org/TR/DOM-Level-3-Events/keyset.html>,
   // GTK uses a GtkIMContext object for the following two purposes:
   //  1. Composing Latin characters (A.1.2), and;
   //  2. Composing CJK characters with an IME (A.1.3).
   // Many JavaScript pages assume composed Latin characters are dispatched to
@@ skipping 58 matching lines @@
 
   // Stores a copy of the most recent commit text received by commit signal
   // handler.
   string16 commit_text_;
 
   DISALLOW_COPY_AND_ASSIGN(GtkIMContextWrapper);
 };
 
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_GTK_IM_CONTEXT_WRAPPER_H_