[gtk+/gtk-2-22] Exposed GtkTreeView's internal GtkTreeSelection for builder files (cherry picked from commit 17516dc

[Matthias Clasen <matthiasc src gnome org>]

commit 1adba9e908daf124770107fe2d1b0cb66363dc0b
Author: Tristan Van Berkom <tristan van berkom gmail com>
Date:   Fri Jun 25 12:14:28 2010 -0400

    Exposed GtkTreeView's internal GtkTreeSelection for builder files
    (cherry picked from commit 17516dc83c890de42584264e225284dc4d957283)

 docs/reference/gtk/tmpl/gtktreeview.sgml |    8 +++++-
 gtk/gtktreeview.c                        |   43 +++++++++++++++++++++--------
 2 files changed, 38 insertions(+), 13 deletions(-)
---
diff --git a/docs/reference/gtk/tmpl/gtktreeview.sgml b/docs/reference/gtk/tmpl/gtktreeview.sgml
index 9dcd8f1..5c4e084 100644
--- a/docs/reference/gtk/tmpl/gtktreeview.sgml
+++ b/docs/reference/gtk/tmpl/gtktreeview.sgml
@@ -46,7 +46,8 @@ former you can use gtk_tree_view_convert_widget_to_bin_window_coords()
 <title>GtkTreeView as GtkBuildable</title>
 <para>
 The GtkTreeView implementation of the GtkBuildable interface accepts
-GtkTreeViewColumn objects as &lt;child&gt; elements in UI definitions.
+GtkTreeViewColumn objects as &lt;child&gt; elements and exposes the
+internal GtkTreeSelection in UI definitions.
 </para>
 <example>
 <title>A UI definition fragment with GtkTreeView</title>
@@ -64,6 +65,11 @@ GtkTreeViewColumn objects as &lt;child&gt; elements in UI definitions.
       </child>
     </object>
   </child>
+  <child internal-child="selection">
+    <object class="GtkTreeSelection" id="selection">
+      <signal name="changed" handler="on_treeview_selection_changed"/>
+    </object>
+  </child>
 </object>
 ]]></programlisting>
 </example>
diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index 765d80c..bbeb44d 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -464,11 +464,14 @@ static GtkTreeViewColumn *gtk_tree_view_get_drop_column (GtkTreeView       *tree
 							 gint               drop_position);
 
 /* GtkBuildable */
-static void gtk_tree_view_buildable_add_child (GtkBuildable *tree_view,
-					       GtkBuilder  *builder,
-					       GObject     *child,
-					       const gchar *type);
-static void gtk_tree_view_buildable_init      (GtkBuildableIface *iface);
+static void     gtk_tree_view_buildable_add_child          (GtkBuildable      *tree_view,
+							    GtkBuilder        *builder,
+							    GObject           *child,
+							    const gchar       *type);
+static GObject *gtk_tree_view_buildable_get_internal_child (GtkBuildable      *buildable,
+							    GtkBuilder        *builder,
+							    const gchar       *childname);
+static void     gtk_tree_view_buildable_init               (GtkBuildableIface *iface);
 
 
 static gboolean scroll_row_timeout                   (gpointer     data);
@@ -1316,12 +1319,6 @@ gtk_tree_view_class_init (GtkTreeViewClass *class)
 }
 
 static void
-gtk_tree_view_buildable_init (GtkBuildableIface *iface)
-{
-  iface->add_child = gtk_tree_view_buildable_add_child;
-}
-
-static void
 gtk_tree_view_init (GtkTreeView *tree_view)
 {
   tree_view->priv = G_TYPE_INSTANCE_GET_PRIVATE (tree_view, GTK_TYPE_TREE_VIEW, GtkTreeViewPrivate);
@@ -1543,7 +1540,16 @@ gtk_tree_view_finalize (GObject *object)
   G_OBJECT_CLASS (gtk_tree_view_parent_class)->finalize (object);
 }
 
-
+
+static GtkBuildableIface *parent_buildable_iface;
+
+static void
+gtk_tree_view_buildable_init (GtkBuildableIface *iface)
+{
+  parent_buildable_iface = g_type_interface_peek_parent (iface);
+  iface->add_child = gtk_tree_view_buildable_add_child;
+  iface->get_internal_child = gtk_tree_view_buildable_get_internal_child;
+}
 
 static void
 gtk_tree_view_buildable_add_child (GtkBuildable *tree_view,
@@ -1554,6 +1560,19 @@ gtk_tree_view_buildable_add_child (GtkBuildable *tree_view,
   gtk_tree_view_append_column (GTK_TREE_VIEW (tree_view), GTK_TREE_VIEW_COLUMN (child));
 }
 
+static GObject *
+gtk_tree_view_buildable_get_internal_child (GtkBuildable      *buildable,
+					    GtkBuilder        *builder,
+					    const gchar       *childname)
+{
+    if (strcmp (childname, "selection") == 0)
+      return G_OBJECT (GTK_TREE_VIEW (buildable)->priv->selection);
+    
+    return parent_buildable_iface->get_internal_child (buildable,
+						       builder,
+						       childname);
+}
+
 /* GtkObject Methods
  */