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

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     import inherits from 'inherits';

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

    import { is } from '../../../util/ModelUtil';
    import { isExpanded } from '../../../util/DiUtil.js';

    /**
     * Add start event child by default when creating an expanded subprocess
     * with create.start or replacing a task with an expanded subprocess.
     */
    export default function SubProcessStartEventBehavior(eventBus, modeling) {
      CommandInterceptor.call(this, eventBus);

      eventBus.on('create.start', function(event) {
        var shape = event.context.shape,
            hints = event.context.hints;

        hints.shouldAddStartEvent = is(shape, 'bpmn:SubProcess') && isExpanded(shape);
      });

      this.postExecuted('shape.create', function(event) {
        var shape = event.context.shape,
            hints = event.context.hints,
            position;

        if (!hints.shouldAddStartEvent) {
          return;
        }

        position = calculatePositionRelativeToShape(shape);

        modeling.createShape({ type: 'bpmn:StartEvent' }, position, shape);
      });

      this.postExecuted('shape.replace', function(event) {
        var oldShape = event.context.oldShape,
            newShape = event.context.newShape,
            position;

        if (
          !is(newShape, 'bpmn:SubProcess') ||
          !is(oldShape, 'bpmn:Task') ||
          !isExpanded(newShape)
        ) {
          return;
        }

        position = calculatePositionRelativeToShape(newShape);

        modeling.createShape({ type: 'bpmn:StartEvent' }, position, newShape);
      });
    }

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

    inherits(SubProcessStartEventBehavior, CommandInterceptor);

    // helpers //////////

    function calculatePositionRelativeToShape(shape) {
      return {
        x: shape.x + shape.width / 6,
        y: shape.y + shape.height / 2
      };
    }