bpmn-js/lib/features/grid-snapping/behavior/AutoPlaceBehavior.js

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import { getNewShapePosition } from '../../auto-place/AutoPlaceUtil';
import { getMid } from 'diagram-js/lib/layout/LayoutUtil';
import { is } from '../../../util/ModelUtil';
export default function AutoPlaceBehavior(eventBus, gridSnapping) {
eventBus.on('autoPlace', function(context) {
var source = context.source,
sourceMid = getMid(source),
shape = context.shape;
var position = getNewShapePosition(source, shape);
[ 'x', 'y' ].forEach(function(axis) {
var options = {};
// do not snap if x/y equal
if (position[ axis ] === sourceMid[ axis ]) {
return;
}
if (position[ axis ] > sourceMid[ axis ]) {
options.min = position[ axis ];
} else {
options.max = position[ axis ];
}
if (is(shape, 'bpmn:TextAnnotation')) {
if (isHorizontal(axis)) {
options.offset = -shape.width / 2;
} else {
options.offset = -shape.height / 2;
}
}
position[ axis ] = gridSnapping.snapValue(position[ axis ], options);
});
// must be returned to be considered by auto place
return position;
});
}
AutoPlaceBehavior.$inject = [
'eventBus',
'gridSnapping'
];
// helpers //////////
function isHorizontal(axis) {
return axis === 'x';
}