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demo.html
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demo.html
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<!DOCTYPE>
<html>
<head>
<title>cytoscape-edgehandles.js demo</title>
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, maximum-scale=1">
<script src="https://unpkg.com/cytoscape/dist/cytoscape.min.js"></script>
<!-- for testing with local version of cytoscape.js -->
<!--<script src="../cytoscape.js/build/cytoscape.js"></script>-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.js"></script>
<script src="cytoscape-edgehandles.js"></script>
<!-- for popper handles -->
<script src="https://unpkg.com/@popperjs/core@2"></script>
<script src="https://unpkg.com/cytoscape-popper@2.0.0/cytoscape-popper.js"></script>
<style>
body {
font-family: helvetica neue, helvetica, liberation sans, arial, sans-serif;
font-size: 14px;
}
#cy {
position: absolute;
left: 0;
top: 0;
bottom: 0;
right: 0;
z-index: 999;
}
h1 {
opacity: 0.5;
font-size: 1em;
font-weight: bold;
}
#buttons {
position: absolute;
right: 0;
top: 0;
z-index: 99999;
margin: 1em;
}
.popper-handle {
width: 20px;
height: 20px;
background: red;
border-radius: 20px;
z-index: 9999;
}
</style>
<script>
document.addEventListener('DOMContentLoaded', function(){
var cy = window.cy = cytoscape({
container: document.getElementById('cy'),
layout: {
name: 'grid',
rows: 2,
cols: 2
},
style: [
{
selector: 'node[name]',
style: {
'content': 'data(name)'
}
},
{
selector: 'edge',
style: {
'curve-style': 'bezier',
'target-arrow-shape': 'triangle'
}
},
// some style for the extension
{
selector: '.eh-handle',
style: {
'background-color': 'red',
'width': 12,
'height': 12,
'shape': 'ellipse',
'overlay-opacity': 0,
'border-width': 12, // makes the handle easier to hit
'border-opacity': 0
}
},
{
selector: '.eh-hover',
style: {
'background-color': 'red'
}
},
{
selector: '.eh-source',
style: {
'border-width': 2,
'border-color': 'red'
}
},
{
selector: '.eh-target',
style: {
'border-width': 2,
'border-color': 'red'
}
},
{
selector: '.eh-preview, .eh-ghost-edge',
style: {
'background-color': 'red',
'line-color': 'red',
'target-arrow-color': 'red',
'source-arrow-color': 'red'
}
},
{
selector: '.eh-ghost-edge.eh-preview-active',
style: {
'opacity': 0
}
}
],
elements: {
nodes: [
{ data: { id: 'j', name: 'Jerry' } },
{ data: { id: 'e', name: 'Elaine' } },
{ data: { id: 'k', name: 'Kramer' } },
{ data: { id: 'g', name: 'George' } }
],
edges: [
{ data: { source: 'j', target: 'e' } },
{ data: { source: 'j', target: 'k' } },
{ data: { source: 'j', target: 'g' } },
{ data: { source: 'e', target: 'j' } },
{ data: { source: 'e', target: 'k' } },
{ data: { source: 'k', target: 'j' } },
{ data: { source: 'k', target: 'e' } },
{ data: { source: 'k', target: 'g' } },
{ data: { source: 'g', target: 'j' } }
]
}
});
var eh = cy.edgehandles();
document.querySelector('#draw-on').addEventListener('click', function() {
eh.enableDrawMode();
});
document.querySelector('#draw-off').addEventListener('click', function() {
eh.disableDrawMode();
});
document.querySelector('#start').addEventListener('click', function() {
eh.start( cy.$('node:selected') );
});
var popperEnabled = false;
document.querySelector('#popper').addEventListener('click', function() {
if (popperEnabled) { return; }
popperEnabled = true;
// example code for making your own handles -- customise events and presentation where fitting
// var popper;
var popperNode;
var popper;
var popperDiv;
var started = false;
function start() {
eh.start(popperNode);
}
function stop() {
eh.stop();
}
function setHandleOn(node) {
if (started) { return; }
removeHandle(); // rm old handle
popperNode = node;
popperDiv = document.createElement('div');
popperDiv.classList.add('popper-handle');
popperDiv.addEventListener('mousedown', start);
document.body.appendChild(popperDiv);
popper = node.popper({
content: popperDiv,
popper: {
placement: 'top',
modifiers: [
{
name: 'offset',
options: {
offset: [0, -10],
},
},
]
}
});
}
function removeHandle() {
if (popper){
popper.destroy();
popper = null;
}
if (popperDiv) {
document.body.removeChild(popperDiv);
popperDiv = null;
}
popperNode = null;
}
cy.on('mouseover', 'node', function(e) {
setHandleOn(e.target);
});
cy.on('grab', 'node', function(){
removeHandle();
});
cy.on('tap', function(e){
if (e.target === cy) {
removeHandle();
}
});
cy.on('zoom pan', function(){
removeHandle();
});
window.addEventListener('mouseup', function(e){
stop();
});
cy.on('ehstart', function(){
started = true;
});
cy.on('ehstop', function(){
started = false;
});
});
});
</script>
</head>
<body>
<h1>cytoscape-edgehandles demo</h1>
<div id="cy"></div>
<div id="buttons">
<button id="start">Start on selected</button>
<button id="draw-on">Draw mode on</button>
<button id="draw-off">Draw mode off</button>
<button id="popper">Use custom popper handles</button>
</div>
</body>
</html>