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

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

    import {
      roundBounds
    } from 'diagram-js/lib/layout/LayoutUtil';

    import {
      hasPrimaryModifier
    } from 'diagram-js/lib/util/Mouse';

    var SLIGHTLY_HIGHER_PRIORITY = 1001;

    /**
     * Invoke {@link Modeling#resizeLane} instead of
     * {@link Modeling#resizeShape} when resizing a Lane
     * or Participant shape.
     */
    export default function ResizeLaneBehavior(eventBus, modeling) {

      eventBus.on('resize.start', SLIGHTLY_HIGHER_PRIORITY + 500, function(event) {
        var context = event.context,
            shape = context.shape;

        if (is(shape, 'bpmn:Lane') || is(shape, 'bpmn:Participant')) {

          // should we resize the opposite lane(s) in
          // order to compensate for the resize operation?
          context.balanced = !hasPrimaryModifier(event);
        }
      });

      /**
       * Intercept resize end and call resize lane function instead.
       */
      eventBus.on('resize.end', SLIGHTLY_HIGHER_PRIORITY, function(event) {
        var context = event.context,
            shape = context.shape,
            canExecute = context.canExecute,
            newBounds = context.newBounds;

        if (is(shape, 'bpmn:Lane') || is(shape, 'bpmn:Participant')) {

          Eif (canExecute) {
            // ensure we have actual pixel values for new bounds
            // (important when zoom level was > 1 during move)
            newBounds = roundBounds(newBounds);

            // perform the actual resize
            modeling.resizeLane(shape, newBounds, context.balanced);
          }

          // stop propagation
          return false;
        }
      });
    }

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