[gtk+] Add default class implementation of gtk_widget_get_request_mode().

[Tristan Van Berkom <tvb src gnome org>]

commit 5a5854f6f64231be8df028dbcb87f75a8025609e
Author: Tristan Van Berkom <tristan van berkom gmail com>
Date:   Fri Jan 28 15:54:50 2011 +0900

    Add default class implementation of gtk_widget_get_request_mode().
    
    Instead of checking if klass->get_request_mode is != NULL from
    the gtk_widget_get_request_mode() api, this allows classes to
    trust that there is a default implementation and chain up (specifically
    added this for gtkmm wrapper objects).

 gtk/gtksizerequest.c |    9 +--------
 gtk/gtkwidget.c      |    9 +++++++++
 2 files changed, 10 insertions(+), 8 deletions(-)
---
diff --git a/gtk/gtksizerequest.c b/gtk/gtksizerequest.c
index 272f2eb..ef96ed0 100644
--- a/gtk/gtksizerequest.c
+++ b/gtk/gtksizerequest.c
@@ -370,16 +370,9 @@ compute_size_for_orientation (GtkWidget         *widget,
 GtkSizeRequestMode
 gtk_widget_get_request_mode (GtkWidget *widget)
 {
-  GtkWidgetClass *klass;
-
   g_return_val_if_fail (GTK_IS_WIDGET (widget), GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH);
 
-  klass = GTK_WIDGET_GET_CLASS (widget);
-  if (klass->get_request_mode)
-    return klass->get_request_mode (widget);
-
-  /* By default widgets are height-for-width. */
-  return GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
+  return GTK_WIDGET_GET_CLASS (widget)->get_request_mode (widget);
 }
 
 /**
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 00343bf..281e539 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -634,6 +634,7 @@ static void             gtk_widget_buildable_custom_finished    (GtkBuildable
 static void             gtk_widget_buildable_parser_finished    (GtkBuildable     *buildable,
                                                                  GtkBuilder       *builder);
 
+static GtkSizeRequestMode gtk_widget_real_get_request_mode      (GtkWidget         *widget);
 static void             gtk_widget_real_get_width               (GtkWidget         *widget,
                                                                  gint              *minimum_size,
                                                                  gint              *natural_size);
@@ -834,6 +835,7 @@ gtk_widget_class_init (GtkWidgetClass *klass)
   klass->realize = gtk_widget_real_realize;
   klass->unrealize = gtk_widget_real_unrealize;
   klass->size_allocate = gtk_widget_real_size_allocate;
+  klass->get_request_mode = gtk_widget_real_get_request_mode;
   klass->get_preferred_width = gtk_widget_real_get_width;
   klass->get_preferred_height = gtk_widget_real_get_height;
   klass->get_preferred_width_for_height = gtk_widget_real_get_width_for_height;
@@ -12940,6 +12942,13 @@ gtk_widget_buildable_custom_finished (GtkBuildable *buildable,
     }
 }
 
+static GtkSizeRequestMode 
+gtk_widget_real_get_request_mode (GtkWidget *widget)
+{ 
+  /* By default widgets are height-for-width. */
+  return GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
+}
+
 static void
 gtk_widget_real_get_width (GtkWidget *widget,
 			   gint      *minimum_size,