gtk: Facilitate use of ComboBox and ComboBoxText with an Entry

Add ComboBox[Text] (bool with_entry) protected constructors to allow
subclasses with an Entry.
Add an Entry property for easy access to the Entry child widget.

Also remove the unused gtk/ComboBoxEntry.custom.

gtk/ComboBox.custom

@@ -30,6 +30,26 @@
 				store.AppendValues (entry);
 		}
 
+		protected ComboBox (bool with_entry) : base (IntPtr.Zero)
+		{
+			if (GetType () != typeof (ComboBox)) {
+				CreateNativeObject (new string [0], new GLib.Value[0]);
+				return;
+			}
+				
+			if (with_entry) {
+				Raw = gtk_combo_box_new_with_entry ();
+			} else {
+				Raw = gtk_combo_box_new ();
+			}
+		}
+
+		public Gtk.Entry Entry {
+			get {
+				return (Gtk.Entry)Child;
+			}
+		}
+
 		public void SetAttributes (CellRenderer cell, params object[] attrs)
 		{
 			if (attrs.Length % 2 != 0)

gtk/ComboBoxText.custom

@@ -1,8 +1,8 @@
-//  Gtk.ComboBoxEntry.custom - Gtk ComboBoxEntry customizations
+//  ComboBoxText.custom - Gtk ComboBoxText customizations
 //
-//  Authors:   Mike Kestner  <mkestner@novell.com>
+//  Authors:  Bertrand Lorentz  <bertrand.lorentz@gmail.com>
 //
-//  Copyright (c) 2005 Novell, Inc.
+//  Copyright (c) 2011 Bertrand Lorentz
 //
 // This program is free software; you can redistribute it and/or
 // modify it under the terms of version 2 of the Lesser GNU General
@@ -18,10 +18,18 @@
 // Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 // Boston, MA 02111-1307, USA.
 
-		public ComboBoxEntry (string[] entries) : this (new ListStore (typeof (string)), 0)
+		protected ComboBoxText (bool with_entry) : base (IntPtr.Zero)
 		{
-			foreach (string entry in entries)
-				AppendText (entry);
+			if (GetType () != typeof (ComboBoxText)) {
+				CreateNativeObject (new string [0], new GLib.Value[0]);
+				return;
+			}
+				
+			if (with_entry) {
+				Raw = gtk_combo_box_text_new_with_entry ();
+			} else {
+				Raw = gtk_combo_box_text_new ();
+			}
 		}
 
 		public Gtk.Entry Entry {
@@ -29,3 +37,4 @@
 				return (Gtk.Entry)Child;
 			}
 		}
+

gtk/Makefile.am

@@ -54,7 +54,7 @@ customs = 				\
 	ColorSelection.custom		\
 	ColorSelectionDialog.custom	\
 	ComboBox.custom			\
-	ComboBoxEntry.custom		\
+	ComboBoxText.custom		\
 	Container.custom		\
 	Dialog.custom			\
 	Drag.custom			\

sample/test/TestComboBox.cs

@@ -29,7 +29,7 @@ namespace WidgetViewer {
 			combo.AppendText ("Foo");
 			combo.AppendText ("Bar");
 			combo.Changed += new EventHandler (OnComboActivated);
-			((Entry)combo.Child).Changed += new EventHandler (OnComboEntryChanged);
+			combo.Entry.Changed += new EventHandler (OnComboEntryChanged);
 			box2.PackStart (combo, true, true, 0);
 
 			HSeparator separator = new HSeparator ();