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| var ELEMENT_ID = 'data-element-id';
import { attr as svgAttr } from 'tiny-svg';
/**
* @class
*
* A registry that keeps track of all shapes in the diagram.
*/
export default function ElementRegistry(eventBus) {
this._elements = {};
this._eventBus = eventBus;
}
ElementRegistry.$inject = [ 'eventBus' ];
/**
* Register a pair of (element, gfx, (secondaryGfx)).
*
* @param {djs.model.Base} element
* @param {SVGElement} gfx
* @param {SVGElement} [secondaryGfx] optional other element to register, too
*/
ElementRegistry.prototype.add = function(element, gfx, secondaryGfx) {
var id = element.id;
this._validateId(id);
// associate dom node with element
svgAttr(gfx, ELEMENT_ID, id);
if (secondaryGfx) {
svgAttr(secondaryGfx, ELEMENT_ID, id);
}
this._elements[id] = { element: element, gfx: gfx, secondaryGfx: secondaryGfx };
};
/**
* Removes an element from the registry.
*
* @param {djs.model.Base} element
*/
ElementRegistry.prototype.remove = function(element) {
var elements = this._elements,
id = element.id || element,
container = id && elements[id];
Eif (container) {
// unset element id on gfx
svgAttr(container.gfx, ELEMENT_ID, '');
if (container.secondaryGfx) {
svgAttr(container.secondaryGfx, ELEMENT_ID, '');
}
delete elements[id];
}
};
/**
* Update the id of an element
*
* @param {djs.model.Base} element
* @param {String} newId
*/
ElementRegistry.prototype.updateId = function(element, newId) {
this._validateId(newId);
Iif (typeof element === 'string') {
element = this.get(element);
}
this._eventBus.fire('element.updateId', {
element: element,
newId: newId
});
var gfx = this.getGraphics(element),
secondaryGfx = this.getGraphics(element, true);
this.remove(element);
element.id = newId;
this.add(element, gfx, secondaryGfx);
};
/**
* Return the model element for a given id or graphics.
*
* @example
*
* elementRegistry.get('SomeElementId_1');
* elementRegistry.get(gfx);
*
*
* @param {String|SVGElement} filter for selecting the element
*
* @return {djs.model.Base}
*/
ElementRegistry.prototype.get = function(filter) {
var id;
Eif (typeof filter === 'string') {
id = filter;
} else {
id = filter && svgAttr(filter, ELEMENT_ID);
}
var container = this._elements[id];
return container && container.element;
};
/**
* Return all elements that match a given filter function.
*
* @param {Function} fn
*
* @return {Array<djs.model.Base>}
*/
ElementRegistry.prototype.filter = function(fn) {
var filtered = [];
this.forEach(function(element, gfx) {
if (fn(element, gfx)) {
filtered.push(element);
}
});
return filtered;
};
/**
* Return all rendered model elements.
*
* @return {Array<djs.model.Base>}
*/
ElementRegistry.prototype.getAll = function() {
return this.filter(function(e) { return e; });
};
/**
* Iterate over all diagram elements.
*
* @param {Function} fn
*/
ElementRegistry.prototype.forEach = function(fn) {
var map = this._elements;
Object.keys(map).forEach(function(id) {
var container = map[id],
element = container.element,
gfx = container.gfx;
return fn(element, gfx);
});
};
/**
* Return the graphical representation of an element or its id.
*
* @example
* elementRegistry.getGraphics('SomeElementId_1');
* elementRegistry.getGraphics(rootElement); // <g ...>
*
* elementRegistry.getGraphics(rootElement, true); // <svg ...>
*
*
* @param {String|djs.model.Base} filter
* @param {Boolean} [secondary=false] whether to return the secondary connected element
*
* @return {SVGElement}
*/
ElementRegistry.prototype.getGraphics = function(filter, secondary) {
var id = filter.id || filter;
var container = this._elements[id];
return container && (secondary ? container.secondaryGfx : container.gfx);
};
/**
* Validate the suitability of the given id and signals a problem
* with an exception.
*
* @param {String} id
*
* @throws {Error} if id is empty or already assigned
*/
ElementRegistry.prototype._validateId = function(id) {
Iif (!id) {
throw new Error('element must have an id');
}
Iif (this._elements[id]) {
throw new Error('element with id ' + id + ' already added');
}
};
|