<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Draggable Link</title>
<meta name="description" content="Drag a link to reconnect it. Nodes have custom Adornments for selection, resizing, and reshaping." />
<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="../../gojs/go-debug.js"></script>
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var objGo = go.GraphObject.make; // for conciseness in defining templates
myDiagram =
objGo(go.Diagram, "myDiagramDiv", // must name or refer to the DIV HTML element
{
grid: objGo(go.Panel, "Grid",
objGo(go.Shape, "LineH", { stroke: "lightgray", strokeWidth: 0.5 }),
objGo(go.Shape, "LineH", { stroke: "gray", strokeWidth: 0.5, interval: 10 }),
objGo(go.Shape, "LineV", { stroke: "lightgray", strokeWidth: 0.5 }),
objGo(go.Shape, "LineV", { stroke: "gray", strokeWidth: 0.5, interval: 10 })
),
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":
objGo(go.Shape, "Diamond", { segmentIndex: 0, cursor: "pointer", desiredSize: new go.Size(8, 8), fill: "tomato", stroke: "darkred" }),
"relinkingTool.toHandleArchetype":
objGo(go.Shape, "Diamond", { segmentIndex: -1, cursor: "pointer", desiredSize: new go.Size(8, 8), fill: "darkred", stroke: "tomato" }),
"linkReshapingTool.handleArchetype":
objGo(go.Shape, "Diamond", { desiredSize: new go.Size(7, 7), fill: "lightblue", stroke: "deepskyblue" }),
rotatingTool: objGo(TopRotatingTool), // defined below
"rotatingTool.snapAngleMultiple": 15,
"rotatingTool.snapAngleEpsilon": 15,
"undoManager.isEnabled": true
});
// when the document is modified, add a "*" to the title and enable the "Save" button
myDiagram.addDiagramListener("Modified", function(e) {
var button = document.getElementById("SaveButton");
if (button) button.disabled = !myDiagram.isModified;
var idx = document.title.indexOf("*");
if (myDiagram.isModified) {
if (idx < 0) document.title += "*";
} else {
if (idx >= 0) document.title = document.title.substr(0, idx);
}
});
// Define a function for creating a "port" that is normally transparent.
// The "name" is used as the GraphObject.portId, the "spot" is used to control how links connect
// and where the port is positioned on the node, and the boolean "output" and "input" arguments
// control whether the user can draw links from or to the port.
function makePort(name, spot, output, input) {
// the port is basically just a small transparent square
return objGo(go.Shape, "Circle",
{
fill: null, // not seen, by default; set to a translucent gray by showSmallPorts, defined below
stroke: null,
desiredSize: new go.Size(7, 7),
alignment: spot, // align the port on the main Shape
alignmentFocus: spot, // just inside the Shape
portId: name, // declare this object to be a "port"
fromSpot: spot, toSpot: spot, // declare where links may connect at this port
fromLinkable: output, toLinkable: input, // declare whether the user may draw links to/from here
cursor: "pointer" // show a different cursor to indicate potential link point
});
}
var nodeSelectionAdornmentTemplate =
objGo(go.Adornment, "Auto",
objGo(go.Shape, { fill: null, stroke: "deepskyblue", strokeWidth: 1.5, strokeDashArray: [4, 2] }),
objGo(go.Placeholder)
);
var nodeResizeAdornmentTemplate =
objGo(go.Adornment, "Spot",
{ locationSpot: go.Spot.Right },
objGo(go.Placeholder),
objGo(go.Shape, { alignment: go.Spot.TopLeft, cursor: "nw-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
objGo(go.Shape, { alignment: go.Spot.Top, cursor: "n-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
objGo(go.Shape, { alignment: go.Spot.TopRight, cursor: "ne-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
objGo(go.Shape, { alignment: go.Spot.Left, cursor: "w-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
objGo(go.Shape, { alignment: go.Spot.Right, cursor: "e-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
objGo(go.Shape, { alignment: go.Spot.BottomLeft, cursor: "se-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
objGo(go.Shape, { alignment: go.Spot.Bottom, cursor: "s-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
objGo(go.Shape, { alignment: go.Spot.BottomRight, cursor: "sw-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" })
);
var nodeRotateAdornmentTemplate =
objGo(go.Adornment,
{ locationSpot: go.Spot.Center, locationObjectName: "CIRCLE" },
objGo(go.Shape, "Circle", { name: "CIRCLE", cursor: "pointer", desiredSize: new go.Size(7, 7), fill: "lightblue", stroke: "deepskyblue" }),
objGo(go.Shape, { geometryString: "M3.5 7 L3.5 30", isGeometryPositioned: true, stroke: "deepskyblue", strokeWidth: 1.5, strokeDashArray: [4, 2] })
);
myDiagram.nodeTemplate =
objGo(go.Node, "Spot",
{ locationSpot: go.Spot.Center },
new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
{ selectable: true, selectionAdornmentTemplate: nodeSelectionAdornmentTemplate },
{ resizable: true, resizeObjectName: "PANEL", resizeAdornmentTemplate: nodeResizeAdornmentTemplate },
{ rotatable: true, rotateAdornmentTemplate: nodeRotateAdornmentTemplate },
new go.Binding("angle").makeTwoWay(),
// the main object is a Panel that surrounds a TextBlock with a Shape
objGo(go.Panel, "Auto",
{ name: "PANEL" },
new go.Binding("desiredSize", "size", go.Size.parse).makeTwoWay(go.Size.stringify),
objGo(go.Shape, "Rectangle", // default figure
{
portId: "", // the default port: if no spot on link data, use closest side
fromLinkable: true, toLinkable: true, cursor: "pointer",
fill: "white", // default color
strokeWidth: 2
},
new go.Binding("figure"),
new go.Binding("fill")),
objGo(go.TextBlock,
{
font: "bold 11pt Helvetica, Arial, sans-serif",
margin: 8,
maxSize: new go.Size(160, NaN),
wrap: go.TextBlock.WrapFit,
editable: true
},
new go.Binding("text").makeTwoWay())
),
// four small named ports, one on each side:
makePort("T", go.Spot.Top, false, true),
makePort("L", go.Spot.Left, true, true),
makePort("R", go.Spot.Right, true, true),
makePort("B", go.Spot.Bottom, true, false),
{ // handle mouse enter/leave events to show/hide the ports
mouseEnter: function(e, node) { showSmallPorts(node, true); },
mouseLeave: function(e, node) { showSmallPorts(node, false); }
}
);
function showSmallPorts(node, show) {
node.ports.each(function(port) {
if (port.portId !== "") { // don't change the default port, which is the big shape
port.fill = show ? "rgba(0,0,0,.3)" : null;
}
});
}
var linkSelectionAdornmentTemplate =
objGo(go.Adornment, "Link",
objGo(go.Shape,
// isPanelMain declares that this Shape shares the Link.geometry
{ isPanelMain: true, fill: null, stroke: "deepskyblue", strokeWidth: 0 }) // use selection object's strokeWidth
);
myDiagram.linkTemplate =
objGo(go.Link, // the whole link panel
{ selectable: true, selectionAdornmentTemplate: linkSelectionAdornmentTemplate },
{ relinkableFrom: true, relinkableTo: true, reshapable: true },
{
routing: go.Link.AvoidsNodes,
curve: go.Link.JumpOver,
corner: 5,
toShortLength: 4
},
new go.Binding("points").makeTwoWay(),
objGo(go.Shape, // the link path shape
{ isPanelMain: true, strokeWidth: 2 }),
objGo(go.Shape, // the arrowhead
{ toArrow: "Standard", stroke: null }),
objGo(go.Panel, "Auto",
new go.Binding("visible", "isSelected").ofObject(),
objGo(go.Shape, "RoundedRectangle", // the link shape
{ fill: "#F8F8F8", stroke: null }),
objGo(go.TextBlock,
{
textAlign: "center",
font: "10pt helvetica, arial, sans-serif",
stroke: "#919191",
margin: 2,
minSize: new go.Size(10, NaN),
editable: true
},
new go.Binding("text").makeTwoWay())
)
);
load(); // load an initial diagram from some JSON text
// initialize the Palette that is on the left side of the page
myPalette =
objGo(go.Palette, "myPaletteDiv", // must name or refer to the DIV HTML element
{
maxSelectionCount: 1,
nodeTemplateMap: myDiagram.nodeTemplateMap, // share the templates used by myDiagram
linkTemplate: // simplify the link template, just in this Palette
objGo(go.Link,
{ // because the GridLayout.alignment is Location and the nodes have locationSpot == Spot.Center,
// to line up the Link in the same manner we have to pretend the Link has the same location spot
locationSpot: go.Spot.Center,
selectionAdornmentTemplate:
objGo(go.Adornment, "Link",
{ locationSpot: go.Spot.Center },
objGo(go.Shape,
{ isPanelMain: true, fill: null, stroke: "deepskyblue", strokeWidth: 0 }),
objGo(go.Shape, // the arrowhead
{ toArrow: "Standard", stroke: null })
)
},
{
routing: go.Link.AvoidsNodes,
curve: go.Link.JumpOver,
corner: 5,
toShortLength: 4
},
new go.Binding("points"),
objGo(go.Shape, // the link path shape
{ isPanelMain: true, strokeWidth: 2 }),
objGo(go.Shape, // the arrowhead
{ toArrow: "Standard", stroke: null })
),
model: new go.GraphLinksModel([ // specify the contents of the Palette
{ text: "Start", figure: "Circle", fill: "#00AD5F" },
{ text: "Step" },
{ text: "DB", figure: "Database", fill: "lightgray" },
{ text: "???", figure: "Diamond", fill: "lightskyblue" },
{ text: "End", figure: "Circle", fill: "#CE0620" },
{ text: "Comment", figure: "RoundedRectangle", fill: "lightyellow" }
], [
// the Palette also has a disconnected Link, which the user can drag-and-drop
{ points: new go.List(go.Point).addAll([new go.Point(0, 0), new go.Point(30, 0), new go.Point(30, 40), new go.Point(60, 40)]) }
])
});
}
function TopRotatingTool() {
go.RotatingTool.call(this);
}
go.Diagram.inherit(TopRotatingTool, go.RotatingTool);
/** @override */
TopRotatingTool.prototype.updateAdornments = function(part) {
go.RotatingTool.prototype.updateAdornments.call(this, part);
var adornment = part.findAdornment("Rotating");
if (adornment !== null) {
adornment.location = part.rotateObject.getDocumentPoint(new go.Spot(0.5, 0, 0, -30)); // above middle top
}
};
/** @override */
TopRotatingTool.prototype.rotate = function(newangle) {
go.RotatingTool.prototype.rotate.call(this, newangle + 90);
};
// end of TopRotatingTool class
// Show the diagram's model in JSON format that the user may edit
function save() {
saveDiagramProperties(); // do this first, before writing to JSON
document.getElementById("mySavedModel").value = myDiagram.model.toJson();
myDiagram.isModified = false;
}
function load() {
myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
loadDiagramProperties(); // do this after the Model.modelData has been brought into memory
}
function saveDiagramProperties() {
myDiagram.model.modelData.position = go.Point.stringify(myDiagram.position);
}
function loadDiagramProperties(e) {
// set Diagram.initialPosition, not Diagram.position, to handle initialization side-effects
var pos = myDiagram.model.modelData.position;
if (pos) myDiagram.initialPosition = go.Point.parse(pos);
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div style="width:100%; white-space:nowrap;">
<span style="display: inline-block; vertical-align: top; width:105px">
<div id="myPaletteDiv" style="border: solid 1px black; height: 620px"></div>
</span>
<span style="display: inline-block; vertical-align: top; width:80%">
<div id="myDiagramDiv" style="border: solid 1px black; height: 620px"></div>
</span>
</div>
<p>
This sample demonstrates the ability for the user to drag around a Link as if it were a Node.
When either end of the link passes over a valid port, the port is highlighted.
</p>
<p>
The link-dragging functionality is enabled by setting some or all of the following properties:
<a>DraggingTool.dragsLink</a>, <a>LinkingTool.isUnconnectedLinkValid</a>, and
<a>RelinkingTool.isUnconnectedLinkValid</a>.
</p>
<p>
Note that a Link is present in the <a>Palette</a> so that it too can be dragged out and onto
the main Diagram. Because links are not automatically routed when either end is not connected
with a Node, the route is provided explicitly when that Palette item is defined.
</p>
<p>
This also demonstrates several custom Adornments:
<a>Part.selectionAdornmentTemplate</a>, <a>Part.resizeAdornmentTemplate</a>, and
<a>Part.rotateAdornmentTemplate</a>.
</p>
<p>
Finally this sample demonstrates saving and restoring the <a>Diagram.position</a> as a property
on the <a>Model.modelData</a> object that is automatically saved and restored when calling <a>Model.toJson</a>
and <a>Model.fromJson</a>.
</p>
<div>
<div>
<button id="SaveButton" onclick="save()">Save</button>
<button onclick="load()">Load</button>
Diagram Model saved in JSON format:
</div>
<textarea id="mySavedModel" style="width:100%;height:300px">
{ "class": "go.GraphLinksModel",
"linkFromPortIdProperty": "fromPort",
"linkToPortIdProperty": "toPort",
"nodeDataArray": [
],
"linkDataArray": [
]}
</textarea>
</div>
</div>
</body>
</html>
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