undo_Reo

by jopandy

HTML

<html>
<head>
  <script src="https://gojs.net/latest/release/go-debug.js"></script>
</head>
<script id="code">
  function init() {
    var $ = go.GraphObject.make;  // for conciseness in defining templates

    myDiagram =
      $(go.Diagram, "myDiagramDiv",  // must name or refer to the DIV HTML element
        {
    
          allowDrop: true,  // must be true to accept drops from the Palette
          "draggingTool.dragsLink": true,
          "draggingTool.isGridSnapEnabled": true,
          "linkingTool.isUnconnectedLinkValid": true,
          "linkingTool.portGravity": 20,
          "relinkingTool.isUnconnectedLinkValid": true,
          "relinkingTool.portGravity": 20,
          "relinkingTool.fromHandleArchetype":
            $(go.Shape, "Diamond", { segmentIndex: 0, cursor: "pointer", desiredSize: new go.Size(8, 8), fill: "tomato", stroke: "darkred" }),
          "relinkingTool.toHandleArchetype":
            $(go.Shape, "Diamond", { segmentIndex: -1, cursor: "pointer", desiredSize: new go.Size(8, 8), fill: "darkred", stroke: "tomato" }),
          "linkReshapingTool.handleArchetype":
            $(go.Shape, "Diamond", { desiredSize: new go.Size(7, 7), fill: "lightblue", stroke: "deepskyblue" }),
          "rotatingTool.snapAngleMultiple": 15,
          "rotatingTool.snapAngleEpsilon": 15,
          "undoManager.isEnabled": true
        });



    myDiagram.nodeTemplate =
      $(go.Node, "Spot",
        { locationSpot: go.Spot.Center },
        new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
        { selectable: true },
        { resizable: true, resizeObjectName: "PANEL"},
        { rotatable: true },
        new go.Binding("angle").makeTwoWay(),
        // the main object is a Panel that surrounds a TextBlock with a Shape
        $(go.Panel, "Auto",
          { name: "PANEL" },
          new go.Binding("desiredSize", "size", go.Size.parse).makeTwoWay(go.Size.stringify),
          $(go.Shape, "Rectangle",  // default...