[gtk+/refactor] demos/gtk-demo/panes.c: Use accessor functions to access GtkWidget

[Javier Jardón <jjardon src gnome org>]

commit 47d57e852a9e65da5e704dffc094dadf23eb8666
Author: Javier Jardón <jjardon gnome org>
Date:   Mon Aug 16 00:36:48 2010 +0200

    demos/gtk-demo/panes.c: Use accessor functions to access GtkWidget

 demos/gtk-demo/panes.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/demos/gtk-demo/panes.c b/demos/gtk-demo/panes.c
index 60ee2dd..d182a89 100644
--- a/demos/gtk-demo/panes.c
+++ b/demos/gtk-demo/panes.c
@@ -17,17 +17,21 @@ void
 toggle_resize (GtkWidget *widget,
 	       GtkWidget *child)
 {
-  GtkPaned *paned = GTK_PANED (child->parent);
+  GtkWidget *parent;
+  GtkPaned *paned;
   gboolean is_child1 = (child == gtk_paned_get_child1 (paned));
   gboolean resize, shrink;
 
+  parent = gtk_widget_get_parent (child);
+  paned = GTK_PANED (parent);
+
   gtk_container_child_get (GTK_CONTAINER (paned), child,
                            "resize", &resize,
                            "shrink", &shrink,
                            NULL);
 
   g_object_ref (child);
-  gtk_container_remove (GTK_CONTAINER (child->parent), child);
+  gtk_container_remove (GTK_CONTAINER (parent), child);
   if (is_child1)
     gtk_paned_pack1 (paned, child, !resize, shrink);
   else
@@ -39,17 +43,21 @@ void
 toggle_shrink (GtkWidget *widget,
 	       GtkWidget *child)
 {
-  GtkPaned *paned = GTK_PANED (child->parent);
+  GtkWidget *parent;
+  GtkPaned *paned;
   gboolean is_child1 = (child == gtk_paned_get_child1 (paned));
   gboolean resize, shrink;
 
+  parent = gtk_widget_get_parent (child);
+  paned = GTK_PANED (parent);
+
   gtk_container_child_get (GTK_CONTAINER (paned), child,
                            "resize", &resize,
                            "shrink", &shrink,
                            NULL);
 
   g_object_ref (child);
-  gtk_container_remove (GTK_CONTAINER (child->parent), child);
+  gtk_container_remove (GTK_CONTAINER (parent), child);
   if (is_child1)
     gtk_paned_pack1 (paned, child, resize, !shrink);
   else