+#define p_area p_intf->p_input->stream.p_selected_area
+ /* If the user hasn't touched the slider since the last time,
+ * then the input can safely change it */
+ if( newvalue == p_intf->p_sys->f_adj_oldvalue )
+ {
+ /* Update the value */
+ p_intf->p_sys->p_adj->value = p_intf->p_sys->f_adj_oldvalue =
+ ( 100. * p_area->i_tell ) / p_area->i_size;
+
+ gtk_signal_emit_by_name( GTK_OBJECT( p_intf->p_sys->p_adj ),
+ "value_changed" );
+ }
+ /* Otherwise, send message to the input if the user has
+ * finished dragging the slider */
+ else if( p_intf->p_sys->b_slider_free )
+ {
+ off_t i_seek = ( newvalue * p_area->i_size ) / 100;
+
+ input_Seek( p_intf->p_input, i_seek );
+
+ /* Update the old value */
+ p_intf->p_sys->f_adj_oldvalue = newvalue;
+ }
+#undef p_area
+ }