gboolean visible;
gboolean realized;
+ VikViewport *vvp;/* simply a reference */
VikTreeview *vt; /* simply a reference */
GtkTreeIter iter;
typedef void (*VikLayerFuncChangeParam) (GtkWidget *, ui_change_values );
-typedef gboolean (*VikLayerFuncReadFileData) (VikLayer *, FILE *); // Should report success or failure
+typedef gboolean (*VikLayerFuncReadFileData) (VikLayer *, FILE *, const gchar *); // gchar* is the directory path. Function should report success or failure
typedef void (*VikLayerFuncWriteFileData) (VikLayer *, FILE *);
/* item manipulation */