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

82 lines
2.0 KiB
JavaScript

import inherits from 'inherits';
import { is } from '../../../util/ModelUtil';
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;
// only handle [a] -> [shape] -> [b] patterns
if (shape.incoming.length !== 1 || shape.outgoing.length !== 1) {
return;
}
var inConnection = shape.incoming[0],
outConnection = shape.outgoing[0];
// only handle sequence flows
if (!is(inConnection, 'bpmn:SequenceFlow') || !is(outConnection, 'bpmn:SequenceFlow')) {
return;
}
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])
];
}
}