typedef void (*VikLayerFuncDragDropRequest) (VikLayer *, VikLayer *, GtkTreeIter *, GtkTreePath *);
typedef gboolean (*VikLayerFuncSelectClick) (VikLayer *, GdkEventButton *, VikViewport *, tool_ed_t*);
typedef void (*VikLayerFuncDragDropRequest) (VikLayer *, VikLayer *, GtkTreeIter *, GtkTreePath *);
typedef gboolean (*VikLayerFuncSelectClick) (VikLayer *, GdkEventButton *, VikViewport *, tool_ed_t*);