ags_meter_callbacks
gboolean ags_meter_expose_event (GtkWidget *widget, GdkEventExpose *event, AgsMeter *meter);
GtkWidget *widget
GdkEventExpose *event
AgsMeter *meter
gboolean ags_meter_configure_event (GtkWidget *widget, GdkEventConfigure *event, AgsMeter *meter);
GdkEventConfigure *event