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

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import inherits from 'inherits';
import CommandInterceptor from 'diagram-js/lib/command/CommandInterceptor';
import {
add as collectionAdd,
remove as collectionRemove
} from 'diagram-js/lib/util/Collections';
import {
getBusinessObject,
is
} from '../../../util/ModelUtil';
import {
createCategoryValue
} from './util/CategoryUtil';
/**
* BPMN specific Group behavior
*/
export default function GroupBehavior(eventBus, bpmnFactory, canvas, elementRegistry) {
CommandInterceptor.call(this, eventBus);
/**
* Gets process definitions
*
* @return {ModdleElement} definitions
*/
function getDefinitions() {
var rootElement = canvas.getRootElement(),
businessObject = getBusinessObject(rootElement);
return businessObject.$parent;
}
/**
* Removes a referenced category value for a given group shape
*
* @param {djs.model.Shape} shape
*/
function removeReferencedCategoryValue(shape) {
var businessObject = getBusinessObject(shape),
categoryValue = businessObject.categoryValueRef,
category = categoryValue.$parent;
if (!categoryValue) {
return;
}
collectionRemove(category.categoryValue, categoryValue);
// cleanup category if it is empty
if (category && !category.categoryValue.length) {
removeCategory(category);
}
}
/**
* Removes a given category from the definitions
*
* @param {ModdleElement} category
*/
function removeCategory(category) {
var definitions = getDefinitions();
collectionRemove(definitions.get('rootElements'), category);
}
/**
* Returns all group element in the current registry
*
* @return {Array<djs.model.shape>} a list of group shapes
*/
function getGroupElements() {
return elementRegistry.filter(function(e) {
return is(e, 'bpmn:Group');
});
}
/**
* Returns true if given categoryValue is referenced in one of the given elements
*
* @param {Array<djs.model.shape>} elements
* @param {ModdleElement} categoryValue
* @return {Boolean}
*/
function isReferenced(elements, categoryValue) {
return elements.some(function(e) {
var businessObject = getBusinessObject(e);
return businessObject.categoryValueRef
&& businessObject.categoryValueRef === categoryValue;
});
}
/**
* remove referenced category + value when group was deleted
*/
this.executed('shape.delete', function(event) {
var context = event.context,
shape = context.shape;
if (is(shape, 'bpmn:Group')) {
var businessObject = getBusinessObject(shape),
categoryValueRef = businessObject.categoryValueRef,
groupElements = getGroupElements();
if (!isReferenced(groupElements, categoryValueRef)) {
removeReferencedCategoryValue(shape);
}
}
});
/**
* re-attach removed category
*/
this.reverted('shape.delete', function(event) {
var context = event.context,
shape = context.shape;
if (is(shape, 'bpmn:Group')) {
var businessObject = getBusinessObject(shape),
categoryValueRef = businessObject.categoryValueRef,
definitions = getDefinitions(),
category = categoryValueRef ? categoryValueRef.$parent : null;
collectionAdd(category.get('categoryValue'), categoryValueRef);
collectionAdd(definitions.get('rootElements'), category);
}
});
/**
* create new category + value when group was created
*/
this.execute('shape.create', function(event) {
var context = event.context,
shape = context.shape,
businessObject = getBusinessObject(shape);
if (is(businessObject, 'bpmn:Group') && !businessObject.categoryValueRef) {
var definitions = getDefinitions(),
categoryValue = createCategoryValue(definitions, bpmnFactory);
// link the reference to the Group
businessObject.categoryValueRef = categoryValue;
}
});
this.revert('shape.create', function(event) {
var context = event.context,
shape = context.shape;
if (is(shape, 'bpmn:Group')) {
removeReferencedCategoryValue(shape);
delete getBusinessObject(shape).categoryValueRef;
}
});
}
GroupBehavior.$inject = [
'eventBus',
'bpmnFactory',
'canvas',
'elementRegistry'
];
inherits(GroupBehavior, CommandInterceptor);