gojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta charset="UTF-8">
<title>Overview Resizing</title>
<meta name="description" content="TypeScript: The OverviewResizingTool extension allows the user to change the viewport of the observed Diagram by resizing the box representing the viewport in an Overview." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
</head>
<body>
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:600px"></div>
<div id="myOverviewDiv" style="border: solid 1px black; width: 250px; height: 200px"></div>
<p><button id="zoomToFit">Zoom to Fit</button><button id="expandAtRandom">Expand random Node</button></p>
<p>
This sample demonstrates a custom <a>ResizingTool</a> which allows the user to resize the overview box.
It is defined in its own file, as <a href="OverviewResizingTool.ts">OverviewResizingTool.ts</a>.
</p>
</div>
<script type="module" id="code">
import * as go from "../release/go-module.js";
import { OverviewResizingTool } from './OverviewResizingTool.js';
if (window.goSamples) window.goSamples(); // init for these samples -- you don't need to call this
const $ = go.GraphObject.make; // for conciseness in defining templates
const myDiagram = $(go.Diagram, 'myDiagramDiv', // create a Diagram for the DIV HTML element
{
layout: $(go.ForceDirectedLayout),
'undoManager.isEnabled': true // enable undo & redo
});
// Define the Node template.
// This uses a Spot Panel to position a button relative
// to the ellipse surrounding the text.
myDiagram.nodeTemplate =
$(go.Node, 'Spot', {
selectionObjectName: 'PANEL',
isTreeExpanded: false,
isTreeLeaf: false
},
// the node's outer shape, which will surround the text
$(go.Panel, 'Auto', { name: 'PANEL' }, $(go.Shape, 'Circle', { fill: '#03A9F4', stroke: 'black' }), $(go.TextBlock, { font: '12pt sans-serif', margin: 5 }, new go.Binding('text', 'key'))),
// the expand/collapse button, at the top-right corner
$('TreeExpanderButton', {
name: 'TREEBUTTON',
width: 20, height: 20,
alignment: go.Spot.TopRight,
alignmentFocus: go.Spot.Center,
// customize the expander behavior to
// create children if the node has never been expanded
click: function (e, obj) {
const node = obj.part; // get the Node containing this Button
if (node === null)
return;
e.handled = true;
expandNode(node);
}
}) // end TreeExpanderButton
); // end Node
// create the model with a root node data
myDiagram.model = new go.TreeModel([
{ key: 0, everExpanded: false }
]);
// Overview
const myOverview = $(go.Overview, 'myOverviewDiv', // the HTML DIV element for the Overview
{
observed: myDiagram,
contentAlignment: go.Spot.Center,
'box.resizable': true,
'resizingTool': new OverviewResizingTool()
});
document.getElementById('zoomToFit').addEventListener('click', function () {
myDiagram.zoomToFit();
});
document.getElementById('expandAtRandom').addEventListener('click', function () {
expandAtRandom();
});
function expandNode(node) {
const diagram = node.diagram;
if (diagram === null)
return;
diagram.startTransaction('CollapseExpandTree');
// this behavior is specific to this incrementalTree sample:
const data = node.data;
if (!data.everExpanded) {
// only create children once per node
diagram.model.setDataProperty(data, 'everExpanded', true);
const numchildren = createSubTree(data);
if (numchildren === 0) { // now known no children: don't need Button!
const btn = node.findObject('TREEBUTTON');
if (btn !== null)
btn.visible = false;
}
}
// this behavior is generic for most expand/collapse tree buttons:
if (node.isTreeExpanded) {
diagram.commandHandler.collapseTree(node);
}
else {
diagram.commandHandler.expandTree(node);
}
diagram.commitTransaction('CollapseExpandTree');
}
// This dynamically creates the immediate children for a node.
// The sample assumes that we have no idea of whether there are any children
// for a node until we look for them the first time, which happens
// upon the first tree-expand of a node.
function createSubTree(parentdata) {
let numchildren = Math.floor(Math.random() * 10);
if (myDiagram.nodes.count <= 1) {
numchildren += 1; // make sure the root node has at least one child
}
// create several node data objects and add them to the model
const model = myDiagram.model;
const parent = myDiagram.findNodeForData(parentdata);
if (parent === null)
return;
for (let i = 0; i < numchildren; i++) {
const childdata = {
key: model.nodeDataArray.length,
parent: parentdata.key
};
// add to model.nodeDataArray and create a Node
model.addNodeData(childdata);
// position the new child node close to the parent
const child = myDiagram.findNodeForData(childdata);
if (child !== null)
child.location = parent.location;
}
return numchildren;
}
function expandAtRandom() {
const eligibleNodes = [];
myDiagram.nodes.each(function (n) {
if (!n.isTreeExpanded)
eligibleNodes.push(n);
});
const node = eligibleNodes[Math.floor(Math.random() * (eligibleNodes.length))];
expandNode(node);
}
window.myDiagram = myDiagram; // Attach to the window for console debugging
</script>
</body>
</html>