all files / lib/core/ GraphicsFactory.js

98.72% Statements 77/78
95% Branches 19/20
100% Functions 16/16
98.72% Lines 77/78
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import {
  forEach,
  reduce
} from 'min-dash';
 
import {
  getChildren,
  getVisual
} from '../util/GraphicsUtil';
 
import { translate } from '../util/SvgTransformUtil';
 
import { clear as domClear } from 'min-dom';
 
import {
  append as svgAppend,
  attr as svgAttr,
  classes as svgClasses,
  create as svgCreate,
  remove as svgRemove
} from 'tiny-svg';
 
 
/**
 * A factory that creates graphical elements
 *
 * @param {EventBus} eventBus
 * @param {ElementRegistry} elementRegistry
 */
export default function GraphicsFactory(eventBus, elementRegistry) {
  this._eventBus = eventBus;
  this._elementRegistry = elementRegistry;
}
 
GraphicsFactory.$inject = [ 'eventBus' , 'elementRegistry' ];
 
 
GraphicsFactory.prototype._getChildren = function(element) {
 
  var gfx = this._elementRegistry.getGraphics(element);
 
  var childrenGfx;
 
  // root element
  if (!element.parent) {
    childrenGfx = gfx;
  } else {
    childrenGfx = getChildren(gfx);
    if (!childrenGfx) {
      childrenGfx = svgCreate('g');
      svgClasses(childrenGfx).add('djs-children');
 
      svgAppend(gfx.parentNode, childrenGfx);
    }
  }
 
  return childrenGfx;
};
 
/**
 * Clears the graphical representation of the element and returns the
 * cleared visual (the <g class="djs-visual" /> element).
 */
GraphicsFactory.prototype._clear = function(gfx) {
  var visual = getVisual(gfx);
 
  domClear(visual);
 
  return visual;
};
 
/**
 * Creates a gfx container for shapes and connections
 *
 * The layout is as follows:
 *
 * <g class="djs-group">
 *
 *   <!-- the gfx -->
 *   <g class="djs-element djs-(shape|connection)">
 *     <g class="djs-visual">
 *       <!-- the renderer draws in here -->
 *     </g>
 *
 *     <!-- extensions (overlays, click box, ...) goes here
 *   </g>
 *
 *   <!-- the gfx child nodes -->
 *   <g class="djs-children"></g>
 * </g>
 *
 * @param {Object} parent
 * @param {String} type the type of the element, i.e. shape | connection
 * @param {Number} [parentIndex] position to create container in parent
 */
GraphicsFactory.prototype._createContainer = function(type, childrenGfx, parentIndex) {
  var outerGfx = svgCreate('g');
  svgClasses(outerGfx).add('djs-group');
 
  // insert node at position
  if (typeof parentIndex !== 'undefined') {
    prependTo(outerGfx, childrenGfx, childrenGfx.childNodes[parentIndex]);
  } else {
    svgAppend(childrenGfx, outerGfx);
  }
 
  var gfx = svgCreate('g');
  svgClasses(gfx).add('djs-element');
  svgClasses(gfx).add('djs-' + type);
 
  svgAppend(outerGfx, gfx);
 
  // create visual
  var visual = svgCreate('g');
  svgClasses(visual).add('djs-visual');
 
  svgAppend(gfx, visual);
 
  return gfx;
};
 
GraphicsFactory.prototype.create = function(type, element, parentIndex) {
  var childrenGfx = this._getChildren(element.parent);
  return this._createContainer(type, childrenGfx, parentIndex);
};
 
GraphicsFactory.prototype.updateContainments = function(elements) {
 
  var self = this,
      elementRegistry = this._elementRegistry,
      parents;
 
  parents = reduce(elements, function(map, e) {
 
    if (e.parent) {
      map[e.parent.id] = e.parent;
    }
 
    return map;
  }, {});
 
  // update all parents of changed and reorganized their children
  // in the correct order (as indicated in our model)
  forEach(parents, function(parent) {
 
    var children = parent.children;
 
    if (!children) {
      return;
    }
 
    var childGfx = self._getChildren(parent);
 
    forEach(children.slice().reverse(), function(c) {
      var gfx = elementRegistry.getGraphics(c);
 
      prependTo(gfx.parentNode, childGfx);
    });
  });
};
 
GraphicsFactory.prototype.drawShape = function(visual, element) {
  var eventBus = this._eventBus;
 
  return eventBus.fire('render.shape', { gfx: visual, element: element });
};
 
GraphicsFactory.prototype.getShapePath = function(element) {
  var eventBus = this._eventBus;
 
  return eventBus.fire('render.getShapePath', element);
};
 
GraphicsFactory.prototype.drawConnection = function(visual, element) {
  var eventBus = this._eventBus;
 
  return eventBus.fire('render.connection', { gfx: visual, element: element });
};
 
GraphicsFactory.prototype.getConnectionPath = function(waypoints) {
  var eventBus = this._eventBus;
 
  return eventBus.fire('render.getConnectionPath', waypoints);
};
 
GraphicsFactory.prototype.update = function(type, element, gfx) {
  // Do not update root element
  if (!element.parent) {
    return;
  }
 
  var visual = this._clear(gfx);
 
  // redraw
  if (type === 'shape') {
    this.drawShape(visual, element);
 
    // update positioning
    translate(gfx, element.x, element.y);
  } else
  Eif (type === 'connection') {
    this.drawConnection(visual, element);
  } else {
    throw new Error('unknown type: ' + type);
  }
 
  if (element.hidden) {
    svgAttr(gfx, 'display', 'none');
  } else {
    svgAttr(gfx, 'display', 'block');
  }
};
 
GraphicsFactory.prototype.remove = function(element) {
  var gfx = this._elementRegistry.getGraphics(element);
 
  // remove
  svgRemove(gfx.parentNode);
};
 
 
// helpers //////////////////////
 
function prependTo(newNode, parentNode, siblingNode) {
  parentNode.insertBefore(newNode, siblingNode || parentNode.firstChild);
}