text: /*
  *  Copyright (C) 1998-2020 by Northwoods Software Corporation. All Rights Reserved.
  */
  /*
  * This is an extension and not part of the main GoJS library.
  * Note that the API for this class may change with any version, even point releases.
  * If you intend to use an extension in production, you should copy the code to your own source directory.
  * Extensions can be found in the GoJS kit under the extensions or extensionsTS folders.
  * See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.
  */
  import * as go from '../release/go-module.js';
  /**
   * The PortShiftingTool class lets a user move a port on a {@link Node}.
   *
   * This tool only works when the Node has a port (any GraphObject) marked with
   * a non-null and non-empty portId that is positioned in a Spot Panel,
   * and the user holds down the Shift key.
   * It works by modifying that port's {@link GraphObject#alignment} property.
   *
   * If you want to experiment with this extension, try the <a href="../../extensionsTS/PortShifting.html">Port Shifting</a> sample.
   * @category Tool Extension
   */
  export class PortShiftingTool extends go.Tool {
      /**
       * Constructs a PortShiftingTool and sets the name for the tool.
       */
      constructor() {
          super();
          /**
           * The port being shifted.
           */
          this.port = null;
          this._originalAlignment = go.Spot.Default;
          this.name = 'PortShifting';
      }
      /**
       * This tool can only start if the mouse has moved enough so that it is not a click,
       * and if the mouse down point is on a GraphObject "port" in a Spot Panel,
       * as determined by {@link #findPort}.
       */
      canStart() {
          const diagram = this.diagram;
          if (!super.canStart())
              return false;
          // require left button & that it has moved far enough away from the mouse down point, so it isn't a click
          const e = diagram.lastInput;
          if (!e.left || !e.shift)
              return false;
          if (!this.isBeyondDragSize())
              return false;
          return this.findPort() !== null;
      }
      /**
       * From the {@link GraphObject} at the mouse point, search up the visual tree until we get to
       * an object that has the {@link GraphObject#portId} property set to a non-empty string, that is in a Spot Panel,
       * and that is not the main element of the panel (typically the first element).
       * @return {GraphObject} This returns null if no such port is at the mouse down point.
       */
      findPort() {
          const diagram = this.diagram;
          const e = diagram.firstInput;
          let elt = diagram.findObjectAt(e.documentPoint, null, null);
          if (elt === null || !(elt.part instanceof go.Node))
              return null;
          while (elt !== null && elt.panel !== null) {
              if (elt.panel.type === go.Panel.Spot && elt.panel.findMainElement() !== elt &&
                  elt.portId !== null && elt.portId !== '')
                  return elt;
              elt = elt.panel;
          }
          return null;
      }
      /**
       * Start a transaction, call {@link #findPort} and remember it as the "port" property,
       * and remember the original value for the port's {@link GraphObject#alignment} property.
       */
      doActivate() {
          this.startTransaction('Shifted Label');
          this.port = this.findPort();
          if (this.port !== null) {
              this._originalAlignment = this.port.alignment.copy();
          }
          super.doActivate();
      }
      /**
       * Stop any ongoing transaction.
       */
      doDeactivate() {
          super.doDeactivate();
          this.stopTransaction();
      }
      /**
       * Clear any reference to a port element.
       */
      doStop() {
          this.port = null;
          super.doStop();
      }
      /**
       * Restore the port's original value for GraphObject.alignment.
       */
      doCancel() {
          if (this.port !== null) {
              this.port.alignment = this._originalAlignment;
          }
          super.doCancel();
      }
      /**
       * During the drag, call {@link #updateAlignment} in order to set the {@link GraphObject#alignment} of the port.
       */
      doMouseMove() {
          if (!this.isActive)
              return;
          this.updateAlignment();
      }
      /**
       * At the end of the drag, update the alignment of the port and finish the tool,
       * completing a transaction.
       */
      doMouseUp() {
          if (!this.isActive)
              return;
          this.updateAlignment();
          this.transactionResult = 'Shifted Label';
          this.stopTool();
      }
      /**
       * Save the port's {@link GraphObject#alignment} as a fractional Spot in the Spot Panel
       * that the port is in. Thus if the main element changes size, the relative positions
       * of the ports will be maintained. But that does assume that the port must remain
       * inside the main element -- it cannot wander away from the node.
       * This does not modify the port's {@link GraphObject#alignmentFocus} property.
       */
      updateAlignment() {
          if (this.port === null || this.port.panel === null)
              return;
          const last = this.diagram.lastInput.documentPoint;
          const main = this.port.panel.findMainElement();
          if (main === null)
              return;
          const tl = main.getDocumentPoint(go.Spot.TopLeft);
          const br = main.getDocumentPoint(go.Spot.BottomRight);
          const x = Math.max(0, Math.min((last.x - tl.x) / (br.x - tl.x), 1));
          const y = Math.max(0, Math.min((last.y - tl.y) / (br.y - tl.y), 1));
          this.port.alignment = new go.Spot(x, y);
      }
  }
  