bpmn-js/lib/features/auto-place/AutoPlace.js

92 lines
2.1 KiB
JavaScript

'use strict';
var is = require('../../util/ModelUtil').is;
var isAny = require('../modeling/util/ModelingUtil').isAny;
var getTextAnnotationPosition = require('./AutoPlaceUtil').getTextAnnotationPosition,
getDataElementPosition = require('./AutoPlaceUtil').getDataElementPosition,
getFlowNodePosition = require('./AutoPlaceUtil').getFlowNodePosition,
getDefaultPosition = require('./AutoPlaceUtil').getDefaultPosition;
/**
* A service that places elements connected to existing ones
* to an appropriate position in an _automated_ fashion.
*
* @param {EventBus} eventBus
* @param {Modeling} modeling
*/
function AutoPlace(eventBus, modeling) {
function emit(event, payload) {
return eventBus.fire(event, payload);
}
/**
* Append shape to source at appropriate position.
*
* @param {djs.model.Shape} source
* @param {djs.model.Shape} shape
*
* @return {djs.model.Shape} appended shape
*/
this.append = function(source, shape) {
// allow others to provide the position
var position = emit('autoPlace', {
source: source,
shape: shape
});
if (!position) {
position = getNewShapePosition(source, shape);
}
var newShape = modeling.appendShape(source, shape, position, source.parent);
// notify interested parties on new shape placed
emit('autoPlace.end', {
shape: newShape
});
return newShape;
};
}
AutoPlace.$inject = [
'eventBus',
'modeling'
];
module.exports = AutoPlace;
// helpers //////////////////////
/**
* Find the new position for the target element to
* connect to source.
*
* @param {djs.model.Shape} source
* @param {djs.model.Shape} element
*
* @return {Point}
*/
function getNewShapePosition(source, element) {
if (is(element, 'bpmn:TextAnnotation')) {
return getTextAnnotationPosition(source, element);
}
if (isAny(element, [ 'bpmn:DataObjectReference', 'bpmn:DataStoreReference' ])) {
return getDataElementPosition(source, element);
}
if (is(element, 'bpmn:FlowNode')) {
return getFlowNodePosition(source, element);
}
return getDefaultPosition(source, element);
}