bpmn-js/lib/features/label-editing/cmd/UpdateLabelHandler.js

145 lines
3.0 KiB
JavaScript

import {
setLabel,
getLabel
} from '../LabelUtil';
import {
getExternalLabelMid,
isLabelExternal,
hasExternalLabel,
isLabel
} from '../../../util/LabelUtil';
import {
getBusinessObject,
is
} from '../../../util/ModelUtil';
var NULL_DIMENSIONS = {
width: 0,
height: 0
};
/**
* A handler that updates the text of a BPMN element.
*/
export default function UpdateLabelHandler(modeling, textRenderer) {
/**
* Set the label and return the changed elements.
*
* Element parameter can be label itself or connection (i.e. sequence flow).
*
* @param {djs.model.Base} element
* @param {String} text
*/
function setText(element, text) {
// external label if present
var label = element.label || element;
var labelTarget = element.labelTarget || element;
setLabel(label, text, labelTarget !== label);
return [ label, labelTarget ];
}
function preExecute(ctx) {
var element = ctx.element,
businessObject = element.businessObject,
newLabel = ctx.newLabel;
if (!isLabel(element)
&& isLabelExternal(element)
&& !hasExternalLabel(element)
&& !isEmptyText(newLabel)) {
// create label
var paddingTop = 7;
var labelCenter = getExternalLabelMid(element);
labelCenter = {
x: labelCenter.x,
y: labelCenter.y + paddingTop
};
modeling.createLabel(element, labelCenter, {
id: businessObject.id + '_label',
businessObject: businessObject
});
}
}
function execute(ctx) {
ctx.oldLabel = getLabel(ctx.element);
return setText(ctx.element, ctx.newLabel);
}
function revert(ctx) {
return setText(ctx.element, ctx.oldLabel);
}
function postExecute(ctx) {
var element = ctx.element,
label = element.label || element,
newLabel = ctx.newLabel,
newBounds = ctx.newBounds,
hints = ctx.hints || {};
if (isLabel(label) && isEmptyText(newLabel)) {
if (hints.removeShape !== false) {
modeling.removeShape(label, { unsetLabel: false });
}
return;
}
// ignore internal labels for elements except text annotations
if (!isLabelExternal(element) && !is(element, 'bpmn:TextAnnotation')) {
return;
}
var bo = getBusinessObject(label);
var text = bo.name || bo.text;
// don't resize without text
if (!text) {
return;
}
// resize element based on label _or_ pre-defined bounds
if (typeof newBounds === 'undefined') {
newBounds = textRenderer.getExternalLabelBounds(label, text);
}
// setting newBounds to false or _null_ will
// disable the postExecute resize operation
if (newBounds) {
modeling.resizeShape(label, newBounds, NULL_DIMENSIONS);
}
}
// API
this.preExecute = preExecute;
this.execute = execute;
this.revert = revert;
this.postExecute = postExecute;
}
UpdateLabelHandler.$inject = [
'modeling',
'textRenderer'
];
// helpers ///////////////////////
function isEmptyText(label) {
return !label || !label.trim();
}