spiff-arena/bpmn-js-spiffworkflow/app/spiffworkflow/InputOutput/IoRules.js

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import inherits from 'inherits';
import RuleProvider from 'diagram-js/lib/features/rules/RuleProvider';
const HIGH_PRIORITY = 1500;
/**
* A custom rule provider that will permit Data Inputs and Data
* Outputs to be placed within a process element (something BPMN.io currently denies)
*
* See {@link BpmnRules} for the default implementation
* of BPMN 2.0 modeling rules provided by bpmn-js.
*
* @param {EventBus} eventBus
*/
export default function IoRules(eventBus) {
RuleProvider.call(this, eventBus);
}
inherits(IoRules, RuleProvider);
IoRules.$inject = [ 'eventBus' ];
IoRules.prototype.init = function() {
this.addRule('shape.create', HIGH_PRIORITY, function(context) {
let element = context.shape;
let target = context.target;
let position = context.position;
return canCreate(element, target, position);
});
};
/**
* Allow folks to drop a dataInput or DataOutput only on the top level process.
*/
function canCreate(element, target, position) {
if ([ 'bpmn:DataInput', 'bpmn:DataOutput' ].includes(element.type)) {
if (target.type == 'bpmn:Process') {
return true;
}
}
}
IoRules.prototype.canCreate = canCreate;