Add a tree dnd testcase

This shows a minimal setup for enabling non-row DND from a treeview.

tests/Makefile.am

@@ -116,6 +116,7 @@ noinst_PROGRAMS =  $(TEST_PROGS)	\
 	testtoolbar2			\
 	stresstest-toolbar		\
 	testtreechanging                \
+	testtreednd			\
 	testtreeedit			\
 	testtreemodel			\
 	testtreeview			\
@@ -258,6 +259,7 @@ testspinbutton_DEPENDENCIES = $(TEST_DEPS)
 teststatusicon_DEPENDENCIES = $(TEST_DEPS)
 teststockbuttonmenu_DEPENDENCIES = $(TEST_DEPS)
 testtreechanging_DEPENDENCIES =	$(DEPS)
+testtreednd_DEPENDENCIES = $(DEPS)
 testtreeedit_DEPENDENCIES = $(DEPS)
 testtreemodel_DEPENDENCIES = $(DEPS)
 testtreeview_DEPENDENCIES = $(DEPS)
@@ -368,6 +370,9 @@ testgtk_SOURCES =	\
 testtreechanging_SOURCES =	\
 	testtreechanging.c
 
+testtreednd_SOURCES = 	\
+	testtreednd.c
+
 testtreeedit_SOURCES = 	\
 	testtreeedit.c
 

tests/testtreednd.c

@@ -0,0 +1,135 @@
+#include <gtk/gtk.h>
+
+typedef GtkListStore MyModel;
+typedef GtkListStoreClass MyModelClass;
+
+static void my_model_drag_source_init (GtkTreeDragSourceIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (MyModel, my_model, GTK_TYPE_LIST_STORE,
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_TREE_DRAG_SOURCE,
+                                                my_model_drag_source_init))
+
+static void
+my_model_class_init (MyModelClass *class)
+{
+}
+
+static void
+my_model_init (MyModel *object)
+{
+  GType types[1] = { G_TYPE_STRING };
+
+  gtk_list_store_set_column_types (GTK_LIST_STORE (object), G_N_ELEMENTS (types), types);
+}
+
+static gboolean
+my_model_drag_data_get (GtkTreeDragSource *source,
+                        GtkTreePath       *path,
+                        GtkSelectionData  *data)
+{
+  GtkTreeIter iter;
+  gchar *text;
+
+  gtk_tree_model_get_iter (GTK_TREE_MODEL (source), &iter, path);
+  gtk_tree_model_get (GTK_TREE_MODEL (source), &iter, 0, &text, -1);
+  gtk_selection_data_set_text (data, text, -1);
+  g_free (text);
+
+  return TRUE;
+}
+
+static void
+my_model_drag_source_init (GtkTreeDragSourceIface *iface)
+{
+  static GtkTreeDragSourceIface *parent;
+
+  parent = g_type_interface_peek_parent (iface);
+
+  iface->row_draggable = parent->row_draggable;
+  iface->drag_data_delete = parent->drag_data_delete;
+  iface->drag_data_get = my_model_drag_data_get;
+}
+
+static GtkTreeModel *
+get_model (void)
+{
+  MyModel *model;
+
+  model = g_object_new (my_model_get_type (), NULL);
+  gtk_list_store_insert_with_values (GTK_LIST_STORE (model), NULL, -1, 0, "Item 1", -1);
+  gtk_list_store_insert_with_values (GTK_LIST_STORE (model), NULL, -1, 0, "Item 2", -1);
+  gtk_list_store_insert_with_values (GTK_LIST_STORE (model), NULL, -1, 0, "Item 3", -1);
+
+  return GTK_TREE_MODEL (model);
+}
+
+static GtkTargetEntry entries[] = {
+  { "text/plain", 0, 0 }
+};
+
+static GtkWidget *
+get_dragsource (void)
+{
+  GtkTreeView *tv;
+  GtkCellRenderer *renderer;
+  GtkTreeViewColumn *column;
+
+  tv = (GtkTreeView*) gtk_tree_view_new ();
+  renderer = gtk_cell_renderer_text_new ();
+  column = gtk_tree_view_column_new_with_attributes ("Text", renderer, "text", 0, NULL);
+  gtk_tree_view_append_column (tv, column);
+
+  gtk_tree_view_set_model (tv, get_model ());
+  gtk_tree_view_enable_model_drag_source (tv, GDK_BUTTON1_MASK, entries, G_N_ELEMENTS (entries), GDK_ACTION_COPY);
+
+  return GTK_WIDGET (tv);
+}
+
+static void
+data_received (GtkWidget *widget,
+               GdkDragContext *context,
+               gint x, gint y,
+               GtkSelectionData *selda,
+               guint info, guint time,
+               gpointer dada)
+{
+  gchar *text;
+
+  text = (gchar*) gtk_selection_data_get_text (selda);
+  gtk_label_set_label (GTK_LABEL (widget), text);
+  g_free (text);
+}
+
+static GtkWidget *
+get_droptarget (void)
+{
+  GtkWidget *label;
+
+  label = gtk_label_new ("Drop here");
+  gtk_drag_dest_set (label, GTK_DEST_DEFAULT_ALL, entries, G_N_ELEMENTS (entries), GDK_ACTION_COPY);
+  g_signal_connect (label, "drag-data-received", G_CALLBACK (data_received), NULL);
+
+  return label;
+}
+
+int
+main (int argc, char *argv[])
+{
+  GtkWidget *window;
+  GtkWidget *box;
+
+  gtk_init (NULL, NULL);
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+
+  box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+  gtk_container_add (GTK_CONTAINER (window), box);
+  gtk_container_add (GTK_CONTAINER (box), get_dragsource ());
+  gtk_container_add (GTK_CONTAINER (box), get_droptarget ());
+
+  gtk_widget_show_all (window);
+
+  gtk_main ();
+
+  return 0;
+}