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Add pan and zoom to DAG preview #46

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77 changes: 68 additions & 9 deletions src/main/ts/extension.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -100,22 +100,81 @@ async function previewDag(uri: string, name?: string) {
"DAG Preview",
vscode.ViewColumn.Beside,
{
enableScripts: true
enableScripts: true,
retainContextWhenHidden: true
}
);
panel.webview.html = `
<html>
<head>
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, maximum-scale=1">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, maximum-scale=1">
<style type="text/css">
#svg-id {
height: 1024px;
width: 100%;
}
</style>
</head>
<body>
<pre class="mermaid" style="text-align: center;">
${content}
</pre>
<script type="module">
import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs';
mermaid.initialize({ startOnLoad: true });
</script>
<div id="diagram"></div>
<script src="https://bumbu.me/svg-pan-zoom/dist/svg-pan-zoom.min.js"></script>
<script type="module">
import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs';
mermaid.initialize({ startOnLoad: false, flowchart: { defaultRenderer: "elk" } });

const drawDiagram = async function () {
const element = document.querySelector('#diagram');
const graphDefinition = \`
${content}
\`;
const { svg } = await mermaid.render('svg-id', graphDefinition);
element.innerHTML = svg.replace(/( )*max-width:( 0-9\.)*px;/i, '');

var doPan = false;
var eventsHandler;
var panZoom;
var mousepos;

eventsHandler = {
haltEventListeners: ['mousedown', 'mousemove', 'mouseup'],
mouseDownHandler: function (ev) {
if (event.target.className == "[object SVGAnimatedString]") {
doPan = true;
mousepos = { x: ev.clientX, y: ev.clientY }
};
},
mouseMoveHandler: function (ev) {
if (doPan) {
panZoom.panBy({ x: ev.clientX - mousepos.x, y: ev.clientY - mousepos.y });
mousepos = { x: ev.clientX, y: ev.clientY };
window.getSelection().removeAllRanges();
}
},
mouseUpHandler: function (ev) {
doPan = false;
},
init: function (options) {
options.svgElement.addEventListener('mousedown', this.mouseDownHandler, false);
options.svgElement.addEventListener('mousemove', this.mouseMoveHandler, false);
options.svgElement.addEventListener('mouseup', this.mouseUpHandler, false);
},
destroy: function (options) {
options.svgElement.removeEventListener('mousedown', this.mouseDownHandler, false);
options.svgElement.removeEventListener('mousemove', this.mouseMoveHandler, false);
options.svgElement.removeEventListener('mouseup', this.mouseUpHandler, false);
}
};

panZoom = svgPanZoom('#svg-id', {
zoomEnabled: true,
controlIconsEnabled: true,
fit: 1,
center: 1,
customEventsHandler: eventsHandler
})
};
await drawDiagram();
</script>
</body>
</html>
`;
Expand Down