[gtkmm] Gtk::TreeModelFilter, TreeModelSort: Implement TreeDragSource

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 0a6e15a1367e376355514e941563dca2215347c2
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Wed Jul 26 13:33:06 2017 +0200

    Gtk::TreeModelFilter, TreeModelSort: Implement TreeDragSource
    
    The corresponding gtk+ classes implement GtkTreeDragSource.

 gtk/src/treemodelfilter.hg |    5 ++++-
 gtk/src/treemodelsort.hg   |    8 +++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/gtk/src/treemodelfilter.hg b/gtk/src/treemodelfilter.hg
index f523452..170705f 100644
--- a/gtk/src/treemodelfilter.hg
+++ b/gtk/src/treemodelfilter.hg
@@ -18,6 +18,7 @@
 
 #include <gtkmm/treeiter.h>
 #include <gtkmm/treemodel.h>
+#include <gtkmm/treedragsource.h>
 // We couldn't include it in treemodel.h, but doing it here makes it easier for people.
 #include <gtkmm/treepath.h>
 
@@ -33,10 +34,12 @@ namespace Gtk
  */
 class TreeModelFilter :
   public Glib::Object,
-  public TreeModel
+  public TreeModel,
+  public TreeDragSource
 {
   _CLASS_GOBJECT(TreeModelFilter, GtkTreeModelFilter, GTK_TREE_MODEL_FILTER, Glib::Object, GObject)
   _IMPLEMENTS_INTERFACE(TreeModel)
+  _IMPLEMENTS_INTERFACE(TreeDragSource)
 
 protected:
 
diff --git a/gtk/src/treemodelsort.hg b/gtk/src/treemodelsort.hg
index 5ec12e8..523f471 100644
--- a/gtk/src/treemodelsort.hg
+++ b/gtk/src/treemodelsort.hg
@@ -22,6 +22,7 @@ _PINCLUDE(glibmm/private/object_p.h)
 #include <gtkmm/treeiter.h>
 #include <gtkmm/treemodel.h>
 #include <gtkmm/treesortable.h>
+#include <gtkmm/treedragsource.h>
 // We couldn't include it in treemodel.h, but doing it here makes it easier for people.
 #include <gtkmm/treepath.h>
 
@@ -48,11 +49,16 @@ namespace Gtk
  *
  * @ingroup TreeView
  */
-class TreeModelSort : public Glib::Object, public TreeModel, public TreeSortable
+class TreeModelSort :
+  public Glib::Object,
+  public TreeModel,
+  public TreeSortable,
+  public TreeDragSource
 {
   _CLASS_GOBJECT(TreeModelSort, GtkTreeModelSort, GTK_TREE_MODEL_SORT, Glib::Object, GObject)
   _IMPLEMENTS_INTERFACE(TreeModel)
   _IMPLEMENTS_INTERFACE(TreeSortable)
+  _IMPLEMENTS_INTERFACE(TreeDragSource)
 
 protected:
   _WRAP_CTOR(TreeModelSort(const Glib::RefPtr<TreeModel>& model), gtk_tree_model_sort_new_with_model)