# all files / bpmn-js/lib/features/modeling/behavior/ RemoveParticipantBehavior.js

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    1×import inherits from 'inherits';

    import CommandInterceptor from 'diagram-js/lib/command/CommandInterceptor';

    import { is } from '../../../util/ModelUtil';

    /**
     * BPMN specific remove behavior
     */
    export default function RemoveParticipantBehavior(eventBus, modeling) {

      CommandInterceptor.call(this, eventBus);

      /**
       * morph collaboration diagram into process diagram
       * after the last participant has been removed
       */

      this.preExecute('shape.delete', function(context) {

        var shape = context.shape,
            parent = shape.parent;

        // activate the behavior if the shape to be removed
        // is a participant
        if (is(shape, 'bpmn:Participant')) {
          context.collaborationRoot = parent;
        }
      }, true);

      this.postExecute('shape.delete', function(context) {

        var collaborationRoot = context.collaborationRoot;

        if (collaborationRoot && !collaborationRoot.businessObject.participants.length) {
          // replace empty collaboration with process diagram
          modeling.makeProcess();
        }
      }, true);

    }

    RemoveParticipantBehavior.$inject = [ 'eventBus', 'modeling' ];

    inherits(RemoveParticipantBehavior, CommandInterceptor);