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macros.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Graphical Macros via Auto Ungrouping</title>
<meta name="description" content="Automatically start editing dropped nodes and ungroup dropped groups to create subgraphs." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2019 by Northwoods Software Corporation. -->
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram =
$(go.Diagram, "myDiagramDiv", // must name or refer to the DIV HTML element
{
// automatically show the state of the diagram's model on the page in a PRE element
"ModelChanged": function(e) {
if (e.isTransactionFinished) {
document.getElementById("mySavedModel").textContent = myDiagram.model.toJson();
}
},
"undoManager.isEnabled": true
});
// define the Node template for regular nodes
myDiagram.nodeTemplateMap.add("", // the default category
$(go.Node, go.Panel.Auto,
// The Node.location comes from the "loc" property of the node data,
// converted by the Point.parse method.
// If the Node.location is changed, it updates the "loc" property of the node data,
// converting back using the Point.stringify method.
new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
// the main object is a Panel that surrounds a TextBlock with a rectangular Shape
$(go.Shape,
{ figure: "Rectangle", fill: "white", strokeWidth: 2 },
new go.Binding("stroke", "color"),
{ portId: "", fromLinkable: true, toLinkable: true, cursor: "pointer" }),
$(go.TextBlock,
{
maxSize: new go.Size(150, NaN), textAlign: "center",
margin: 6, editable: true, name: "TEXT",
font: "16pt Helvetica, Arial, sans-serif"
},
new go.Binding("text", "text").makeTwoWay())));
myDiagram.groupTemplate =
$(go.Group, go.Panel.Auto,
{
isSubGraphExpanded: false, // only show the Group itself, not any of its members
ungroupable: true
}, // allow the ExternalObjectsDropped event handler to ungroup
// the members to be top-level parts, via a command
$(go.Shape, "Rectangle", // the rectangular shape around the members
{ fill: "rgba(128,128,128,0.2)", stroke: "gray", strokeWidth: 3 }),
$(go.Placeholder, { alignment: go.Spot.TopLeft }),
$(go.TextBlock,
{ font: "bold 16pt Helvetica, Arial, sans-serif", margin: 10 },
new go.Binding("text", "text")));
myDiagram.linkTemplate =
$(go.Link,
$(go.Shape, { strokeWidth: 1.5 }),
$(go.Shape, { toArrow: "Standard", stroke: null }));
// this DiagramEvent is raised when the user has drag-and-dropped something
// from another Diagram (a Palette in this case) into this Diagram
myDiagram.addDiagramListener("ExternalObjectsDropped", function(e) {
// stop any ongoing text editing
if (myDiagram.currentTool instanceof go.TextEditingTool) {
myDiagram.currentTool.acceptText(go.TextEditingTool.LostFocus);
}
// expand any "macros"
myDiagram.commandHandler.ungroupSelection();
// start editing the first node that was dropped after ungrouping
var tb = myDiagram.selection.first().findObject('TEXT');
if (tb) myDiagram.commandHandler.editTextBlock(tb);
});
// initialize the Palette that is on the left side of the page
myPalette =
$(go.Palette, "myPaletteDiv", // must name or refer to the DIV HTML element
{
nodeTemplateMap: myDiagram.nodeTemplateMap,
groupTemplateMap: myDiagram.groupTemplateMap
});
myPalette.model = new go.GraphLinksModel([
// a regular node
{ key: "B", text: "some block", color: "blue" },
// a group node, plus three member nodes in that group
{ key: "G", text: "Macro", isGroup: true },
{ key: "Ga", text: "A block", color: "green", group: "G", loc: "0 0" },
{ key: "Gb", text: "B block", color: "orange", group: "G", loc: "150 25" },
{ key: "Gc", text: "C block", color: "red", group: "G", loc: "50 100" }
], [
{ from: "Ga", to: "Gb" },
{ from: "Ga", to: "Gc" },
{ from: "Gb", to: "Gc" }
]);
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div style="width: 100%; display: flex; justify-content: space-between">
<div id="myPaletteDiv" style="width: 135px; margin-right: 2px; background-color: whitesmoke; border: solid 1px black"></div>
<div id="myDiagramDiv" style="flex-grow: 1; height: 500px; border: solid 1px black"></div>
</div>
<p>
When one drags the "Macro" node (actually a <a>Group</a>) from the Palette into the main Diagram,
the "ExternalObjectsDropped" <a>DiagramEvent</a> listener automatically ungroups that group node
to show all of its members nodes and links that were copied by the drag-and-drop.
</p>
<p>
Note also that a drop causes the <a>TextEditingTool</a> to automatically start editing the text in the node.
</p>
Diagram Model saved in JSON format:
<br />
<pre id="mySavedModel" style="width:100%;height:300px">
</pre>
</div>
</body>
</html>