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