Integrating GtkIMContext into the RenderWidgetHostViewGtk class (Take 2)....

chrome/browser/renderer_host/render_widget_host_view_gtk.h

 // Copyright (c) 2006-2009 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_RENDER_WIDGET_HOST_VIEW_GTK_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 
 #include <gdk/gdk.h>
 #include <vector>
 
 #include "base/gfx/native_widget_types.h"
 #include "chrome/browser/renderer_host/render_widget_host_view.h"
 #include "chrome/common/owned_widget_gtk.h"
 #include "chrome/common/render_messages.h"
 #include "webkit/glue/webcursor.h"
 
 class RenderWidgetHost;
 
 typedef struct _GtkClipboard GtkClipboard;
 typedef struct _GtkSelectionData GtkSelectionData;
+typedef struct _GtkIMContext GtkIMContext;
 
 // -----------------------------------------------------------------------------
 // See comments in render_widget_host_view.h about this class and its members.
 // -----------------------------------------------------------------------------
 class RenderWidgetHostViewGtk : public RenderWidgetHostView {
  public:
   RenderWidgetHostViewGtk(RenderWidgetHost* widget);
   ~RenderWidgetHostViewGtk();
 
   // Initialize this object for use as a drawing area.
@@ skipping 71 matching lines @@
 
   // Variables used only for popups --------------------------------------------
   // Our parent widget.
   RenderWidgetHostView* parent_host_view_;
   // The native view of our parent, equivalent to
   // parent_host_view_->GetNativeView().
   GtkWidget* parent_;
   // We ignore the first mouse release on popups.  This allows the popup to
   // stay open.
   bool is_popup_first_mouse_release_;
+
+  // 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
+  // their onkeypress() handlers but not dispatched CJK characters composed
+  // with an IME. To emulate this behavior, we should monitor the status of
+  // this GtkIMContext object and prevent sending Char events when a
+  // GtkIMContext object sends a "commit" signal with the CJK characters
+  // composed by an IME.
+  GtkIMContext* im_context_;
+
+  // Whether or not the above GtkIMContext is composing a CJK text with an IME.
+  // The GtkIMContext object sends a "preedit_start" before it starts composing
+  // a CJK text and a "preedit_end" signal after it finishes composing it.
+  // On the other hand, the GtkIMContext object doesn't send them when
+  // composing Latin texts. So, we monitor the above signals to check whether
+  // or not the GtkIMContext object is composing a CJK text.
+  bool im_is_composing_cjk_text_;
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_