bpmn-js/lib/features/modeling/behavior/ModelingFeedback.js

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

var COLLAB_ERR_MSG = 'flow elements must be children of pools/participants',
    PROCESS_ERR_MSG = 'participants cannot be pasted onto a non-empty process diagram';


export default function ModelingFeedback(eventBus, tooltips, translate) {

  function showError(position, message, timeout) {
    tooltips.add({
      position: {
        x: position.x + 5,
        y: position.y + 5
      },
      type: 'error',
      timeout: timeout || 2000,
      html: '<div>' + message + '</div>'
    });
  }

  eventBus.on([ 'shape.move.rejected', 'create.rejected' ], function(event) {
    var context = event.context,
        shape = context.shape,
        target = context.target;

    if (is(target, 'bpmn:Collaboration') && is(shape, 'bpmn:FlowNode')) {
      showError(event, translate(COLLAB_ERR_MSG));
    }
  });

  eventBus.on([ 'elements.paste.rejected' ], function(event) {
    var context = event.context,
        position = context.position,
        target = context.target;

    if (is(target, 'bpmn:Collaboration')) {
      showError(position, translate(COLLAB_ERR_MSG));
    }

    if (is(target, 'bpmn:Process')) {
      showError(position, translate(PROCESS_ERR_MSG), 3000);
    }
  });
}

ModelingFeedback.$inject = [
  'eventBus',
  'tooltips',
  'translate'
];