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

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import inherits from 'inherits';
import CommandInterceptor from 'diagram-js/lib/command/CommandInterceptor';
import { isAny } from '../util/ModelingUtil';
import { getBusinessObject } from '../../../util/ModelUtil';
/**
* BPMN specific attach event behavior
*/
export default function AttachEventBehavior(eventBus, bpmnReplace) {
CommandInterceptor.call(this, eventBus);
/**
* replace intermediate event with boundary event when
* attaching it to a shape
*/
this.preExecute('elements.move', function(context) {
var shapes = context.shapes,
host = context.newHost,
shape,
eventDefinition,
boundaryEvent,
newShape;
if (shapes.length !== 1) {
return;
}
shape = shapes[0];
if (host && isAny(shape, [ 'bpmn:IntermediateThrowEvent', 'bpmn:IntermediateCatchEvent' ])) {
eventDefinition = getEventDefinition(shape);
boundaryEvent = {
type: 'bpmn:BoundaryEvent',
host: host
};
if (eventDefinition) {
boundaryEvent.eventDefinitionType = eventDefinition.$type;
}
newShape = bpmnReplace.replaceElement(shape, boundaryEvent, { layoutConnection: false });
context.shapes = [ newShape ];
}
}, true);
}
AttachEventBehavior.$inject = [
'eventBus',
'bpmnReplace'
];
inherits(AttachEventBehavior, CommandInterceptor);
// helper /////
function getEventDefinition(element) {
var bo = getBusinessObject(element);
return bo && bo.eventDefinitions && bo.eventDefinitions[0];
}