+ // for activate ok/apply immediately upon input
+ fl_set_input_return(bbox_->input_bb_x0, FL_RETURN_CHANGED);
+ fl_set_input_return(bbox_->input_bb_y0, FL_RETURN_CHANGED);
+ fl_set_input_return(bbox_->input_bb_x1, FL_RETURN_CHANGED);
+ fl_set_input_return(bbox_->input_bb_y1, FL_RETURN_CHANGED);
+
+ fl_set_input_filter(bbox_->input_bb_x0, fl_unsigned_float_filter);
+ fl_set_input_filter(bbox_->input_bb_y0, fl_unsigned_float_filter);
+ fl_set_input_filter(bbox_->input_bb_y1, fl_unsigned_float_filter);
+