feat(modeling): create boundary event via moving intermediate event

lib/features/modeling/behavior/AttachEventBehavior.js

@@ -0,0 +1,61 @@
+import inherits from 'inherits';
+
+import CommandInterceptor from 'diagram-js/lib/command/CommandInterceptor';
+
+import { is } from '../../../util/ModelUtil';
+
+
+/**
+ * BPMN specific attach event behavior
+ */
+export default function AttachEventBehavior(eventBus, bpmnFactory, 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,
+        newShape,
+        businessObject,
+        boundaryEvent;
+
+    if (shapes.length !== 1) {
+      return;
+    }
+
+    shape = shapes[0];
+
+    var attrs = {
+      cancelActivity: true
+    };
+
+    if (host && is(shape, 'bpmn:IntermediateThrowEvent')) {
+      attrs.attachedToRef = host.businessObject;
+
+      businessObject = bpmnFactory.create('bpmn:BoundaryEvent', attrs);
+
+      boundaryEvent = {
+        type: 'bpmn:BoundaryEvent',
+        businessObject: businessObject
+      };
+
+      newShape = bpmnReplace.replaceElement(shape, boundaryEvent);
+
+      context.shapes = [ newShape ];
+    }
+  }, true);
+}
+
+AttachEventBehavior.$inject = [
+  'eventBus',
+  'bpmnFactory',
+  'bpmnReplace'
+];
+
+inherits(AttachEventBehavior, CommandInterceptor);

lib/features/modeling/behavior/index.js

@@ -1,5 +1,6 @@
 import AdaptiveLabelPositioningBehavior from './AdaptiveLabelPositioningBehavior';
 import AppendBehavior from './AppendBehavior';
+import AttachEventBehavior from './AttachEventBehavior';
 import BoundaryEventBehavior from './BoundaryEventBehavior';
 import CopyPasteBehavior from './CopyPasteBehavior';
 import CreateBoundaryEventBehavior from './CreateBoundaryEventBehavior';
@@ -31,6 +32,7 @@ export default {
   __init__: [
     'adaptiveLabelPositioningBehavior',
     'appendBehavior',
+    'attachEventBehavior',
     'boundaryEventBehavior',
     'copyPasteBehavior',
     'createBoundaryEventBehavior',
@@ -60,6 +62,7 @@ export default {
   ],
   adaptiveLabelPositioningBehavior: [ 'type', AdaptiveLabelPositioningBehavior ],
   appendBehavior: [ 'type', AppendBehavior ],
+  attachEventBehavior: [ 'type', AttachEventBehavior ],
   boundaryEventBehavior: [ 'type', BoundaryEventBehavior ],
   copyPasteBehavior: [ 'type', CopyPasteBehavior ],
   createBoundaryEventBehavior: [ 'type', CreateBoundaryEventBehavior ],

lib/features/rules/BpmnRules.js

@@ -564,8 +564,7 @@ function isLane(element) {
  * this must be reflected in the rules.
  */
 function isBoundaryCandidate(element) {
-  return isBoundaryEvent(element) ||
-        (is(element, 'bpmn:IntermediateThrowEvent') && !element.parent);
+  return isBoundaryEvent(element) || is(element, 'bpmn:IntermediateThrowEvent');
 }
 
 function hasNoEventDefinition(element) {
@@ -605,11 +604,6 @@ function canAttach(elements, target, source, position) {
     elements = [ elements ];
   }
 
-  // disallow appending as boundary event
-  if (source) {
-    return false;
-  }
-
   // only (re-)attach one element at a time
   if (elements.length !== 1) {
     return false;

test/fixtures/bpmn/boundary-events.bpmn

@@ -14,6 +14,7 @@
     <bpmn2:task id="Task_2" />
     <bpmn2:boundaryEvent id="BoundaryEvent_2" name="superman" attachedToRef="Task_2" />
     <bpmn2:task id="CompensationTask" isForCompensation="true" />
+    <bpmn2:intermediateThrowEvent id="IntermediateThrowEvent_1" name="joker" />
   </bpmn2:process>
   <bpmndi:BPMNDiagram id="BPMNDiagram_1">
     <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_1">
@@ -54,6 +55,12 @@
       <bpmndi:BPMNShape id="CompensationTask_di" bpmnElement="CompensationTask">
         <dc:Bounds x="795" y="249" width="100" height="80" />
       </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="IntermediateThrowEvent_1_di" bpmnElement="IntermediateThrowEvent_1">
+        <dc:Bounds x="185" y="480" width="36" height="36" />
+        <bpmndi:BPMNLabel>
+          <dc:Bounds x="191" y="525" width="24" height="14" />
+        </bpmndi:BPMNLabel>
+      </bpmndi:BPMNShape>
     </bpmndi:BPMNPlane>
   </bpmndi:BPMNDiagram>
 </bpmn2:definitions>

test/spec/features/modeling/behavior/AttachEventBehaviorSpec.js

@@ -0,0 +1,59 @@
+import {
+  bootstrapModeler,
+  inject
+} from 'test/TestHelper';
+
+import modelingModule from 'lib/features/modeling';
+import coreModule from 'lib/core';
+
+
+describe('features/modeling/behavior - attach events', function() {
+
+  var testModules = [ coreModule, modelingModule ];
+
+  var processDiagramXML = require('../../../../fixtures/bpmn/boundary-events.bpmn');
+
+  beforeEach(bootstrapModeler(processDiagramXML, { modules: testModules }));
+
+
+  it('should execute on attach', inject(function(elementRegistry, modeling) {
+
+    // given
+    var eventId = 'IntermediateThrowEvent_1',
+        intermediateThrowEvent = elementRegistry.get(eventId),
+        subProcess = elementRegistry.get('SubProcess_1'),
+        boundaryEvent;
+
+    var elements = [ intermediateThrowEvent ];
+
+    // when
+    modeling.moveElements(elements, { x: 60, y: -131 }, subProcess, { attach: true });
+
+    // then
+    boundaryEvent = elementRegistry.get(eventId);
+
+    expect(intermediateThrowEvent.parent).to.not.exist;
+    expect(boundaryEvent).to.exist;
+    expect(boundaryEvent.type).to.equal('bpmn:BoundaryEvent');
+    expect(boundaryEvent.businessObject.attachedToRef).to.equal(subProcess.businessObject);
+  }));
+
+
+  it('should NOT execute on drop', inject(function(elementRegistry, modeling) {
+
+    // given
+    var eventId = 'IntermediateThrowEvent_1',
+        intermediateThrowEvent = elementRegistry.get(eventId),
+        subProcess = elementRegistry.get('SubProcess_1');
+
+    var elements = [ intermediateThrowEvent ];
+
+    // when
+    modeling.moveElements(elements, { x: 60, y: -191 }, subProcess);
+
+    // then
+    expect(intermediateThrowEvent.parent).to.eql(subProcess);
+    expect(intermediateThrowEvent.type).to.equal('bpmn:IntermediateThrowEvent');
+  }));
+
+});

test/spec/features/rules/BpmnRulesSpec.js

@@ -1260,6 +1260,23 @@ describe('features/modeling/rules - BpmnRules', function() {
       }
     ));
 
+
+    it('attach/move IntermediateThrowEvent -> SubProcess', inject(
+      function(elementRegistry) {
+
+        // given
+        var intermediateThrowEvent = elementRegistry.get('IntermediateThrowEvent_1');
+
+        var elements = [ intermediateThrowEvent ];
+
+        // then
+        expectCanMove(elements, 'SubProcess_1', {
+          attach: 'attach',
+          move: true
+        });
+      }
+    ));
+
   });
 
 
@@ -1539,7 +1556,7 @@ describe('features/modeling/rules - BpmnRules', function() {
         );
 
         // then
-        expect(canAttach).to.be.false;
+        expect(canAttach).to.eql('attach');
         expect(canCreate).to.be.false;
       }
     ));