1 files changed, 91 insertions, 0 deletions
diff --git a/libs/gtkmm2/gtk/src/treedragsource.ccg b/libs/gtkmm2/gtk/src/treedragsource.ccg
new file mode 100644
index 0000000000..c1e05c798d
--- /dev/null
+++ b/libs/gtkmm2/gtk/src/treedragsource.ccg
@@ -0,0 +1,91 @@
+// -*- c++ -*-
+/* $Id: treedragsource.ccg,v 1.4 2006/05/11 11:40:24 murrayc Exp $ */
+
+/* Copyright 1998-2002 The gtkmm Development Team
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <gtkmm/treepath.h>
+#include <gtkmm/selectiondata_private.h> //For SelectionData_WithoutOwnership
+#include <gtk/gtktreednd.h>
+
+
+namespace Gtk
+{
+
+#ifdef GLIBMM_VFUNCS_ENABLED
+//This vfunc wrapper is manually written, so that we can use a temporary instance for the SelectionData& output parameter:
+
+gboolean TreeDragSource_Class::drag_data_get_vfunc_callback(GtkTreeDragSource* self, GtkTreePath* path, GtkSelectionData* selection_data)
+{
+  CppObjectType *const obj = dynamic_cast<CppObjectType*>(
+      Glib::ObjectBase::_get_current_wrapper((GObject*)self));
+
+  // Non-gtkmmproc-generated custom classes implicitly call the default
+  // Glib::ObjectBase constructor, which sets is_derived_. But gtkmmproc-
+  // generated classes can use this optimisation, which avoids the unnecessary
+  // parameter conversions if there is no possibility of the virtual function
+  // being overridden:
+  if(obj && obj->is_derived_())
+  {
+    #ifdef GLIBMM_EXCEPTIONS_ENABLED
+    try // Trap C++ exceptions which would normally be lost because this is a C callback.
+    {
+    #endif //GLIBMM_EXCEPTIONS_ENABLED
+      // Call the virtual member method, which derived classes might override.
+      SelectionData_WithoutOwnership temp_instance(selection_data);
+      return static_cast<int>(obj->drag_data_get_vfunc(Gtk::TreePath(path, true), temp_instance));
+    #ifdef GLIBMM_EXCEPTIONS_ENABLED
+    }
+    catch(...)
+    {
+      Glib::exception_handlers_invoke();
+    }
+    #endif //GLIBMM_EXCEPTIONS_ENABLED
+  }
+  else
+  {
+    BaseClassType *const base = static_cast<BaseClassType*>(
+        g_type_interface_peek_parent( // Get the parent interface of the interface (The original underlying C interface).
+g_type_interface_peek(G_OBJECT_GET_CLASS(self), CppObjectType::get_type()) // Get the interface.
+)    );
+
+    // Call the original underlying C function:
+    if(base && base->drag_data_get)
+      return (*base->drag_data_get)(self, path, selection_data);
+  }
+
+  typedef gboolean RType;
+  return RType();
+}
+
+bool Gtk::TreeDragSource::drag_data_get_vfunc(const TreeModel::Path& path, SelectionData& selection_data) const
+{
+  BaseClassType *const base = static_cast<BaseClassType*>(
+      g_type_interface_peek_parent( // Get the parent interface of the interface (The original underlying C interface).
+g_type_interface_peek(G_OBJECT_GET_CLASS(gobject_), CppObjectType::get_type()) // Get the interface.
+)  );
+
+  if(base && base->drag_data_get)
+    return (*base->drag_data_get)(const_cast<GtkTreeDragSource*>(gobj()),const_cast<GtkTreePath*>((path).gobj()), selection_data.gobj());
+
+  typedef bool RType;
+  return RType();
+}
+#endif //GLIBMM_VFUNCS_ENABLED
+
+} //namespace Gtk
+