Possible to click endpoints to create link via LinkingTool?

GoJS
29

Here are the complete implementations of LinkingTool.doActivate and LinkingTool.doDeactivate. Pardon me if there are any references to internal properties or methods.

LinkingTool.prototype.doActivate = function() {
  var diagram = this.diagram;
  if (diagram === null) return;
  var startPort = this.findLinkablePort();
  if (startPort === null) return;

  this.startTransaction(this.name);

  diagram.isMouseCaptured = true;
  diagram.currentCursor = 'pointer';

  if (this.isForwards) {
    if (this.temporaryToNode !== null && !this.temporaryToNode.location.isReal()) {
      this.temporaryToNode.location = diagram.lastInput.documentPoint;
    }
    this.originalFromPort = startPort;
    var node = this.originalFromPort.part;
    if (node instanceof Node) this.originalFromNode = /** @type {Node} */ (node);
    this.copyPortProperties(this.originalFromNode, this.originalFromPort, this.temporaryFromNode, this.temporaryFromPort, false);
  } else {
    if (this.temporaryFromNode !== null && !this.temporaryFromNode.location.isReal()) {
      this.temporaryFromNode.location = diagram.lastInput.documentPoint;
    }
    this.originalToPort = startPort;
    var node = this.originalToPort.part;
    if (node instanceof Node) this.originalToNode = /** @type {Node} */ (node);
    this.copyPortProperties(this.originalToNode, this.originalToPort, this.temporaryToNode, this.temporaryToPort, true);
  }

  diagram.add(this.temporaryFromNode);
  diagram.add(this.temporaryToNode);

  if (this.temporaryLink !== null) {
    if (this.temporaryFromNode !== null) {
      this.temporaryLink.fromNode = this.temporaryFromNode;
    }
    if (this.temporaryToNode !== null) {
      this.temporaryLink.toNode = this.temporaryToNode;
    }
    this.temporaryLink.invalidateRoute();
    diagram.add(this.temporaryLink);
  }

  this.isActive = true;
};

LinkingTool.prototype.doDeactivate = function() {
  this.isActive = false;
  var diagram = this.diagram;
  if (diagram === null) return;
  diagram.remove(this.temporaryLink);
  diagram.remove(this.temporaryFromNode);
  diagram.remove(this.temporaryToNode);
  diagram.isMouseCaptured = false;
  diagram.currentCursor = '';
  this.stopTransaction();
};