all files / lib/features/modeling/behavior/ RemoveElementBehavior.js

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import inherits from 'inherits';
 
import CommandInterceptor from 'diagram-js/lib/command/CommandInterceptor';
 
import lineIntersect from './util/LineIntersect';
 
 
export default function RemoveElementBehavior(eventBus, bpmnRules, modeling) {
 
  CommandInterceptor.call(this, eventBus);
 
  /**
   * Combine sequence flows when deleting an element
   * if there is one incoming and one outgoing
   * sequence flow
   */
  this.preExecute('shape.delete', function(e) {
 
    var shape = e.context.shape;
 
    if (shape.incoming.length == 1 && shape.outgoing.length == 1) {
 
      var inConnection = shape.incoming[0],
          outConnection = shape.outgoing[0];
 
 
      if (bpmnRules.canConnect(inConnection.source, outConnection.target, inConnection)) {
 
        // compute new, combined waypoints
        var newWaypoints = getNewWaypoints(inConnection.waypoints, outConnection.waypoints);
 
        modeling.reconnectEnd(inConnection, outConnection.target, newWaypoints);
      }
    }
  });
 
}
 
inherits(RemoveElementBehavior, CommandInterceptor);
 
RemoveElementBehavior.$inject = [
  'eventBus',
  'bpmnRules',
  'modeling'
];
 
 
// helpers //////////////////////
 
function getDocking(point) {
  return point.original || point;
}
 
 
function getNewWaypoints(inWaypoints, outWaypoints) {
 
  var intersection = lineIntersect(
    getDocking(inWaypoints[inWaypoints.length - 2]),
    getDocking(inWaypoints[inWaypoints.length - 1]),
    getDocking(outWaypoints[1]),
    getDocking(outWaypoints[0]));
 
  if (intersection) {
    return [].concat(
      inWaypoints.slice(0, inWaypoints.length - 1),
      [ intersection ],
      outWaypoints.slice(1));
  } else {
    return [
      getDocking(inWaypoints[0]),
      getDocking(outWaypoints[outWaypoints.length - 1])
    ];
  }
}