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Demo of using jasonm/rich-text#teamwork-sharedb-presence #1

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Demo of using jasonm/rich-text#teamwork-sharedb-presence #1

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80 changes: 79 additions & 1 deletion examples/rich-text/client.js
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Original file line number Diff line number Diff line change
@@ -1,6 +1,10 @@
var sharedb = require('@teamwork/sharedb/lib/client');
var richText = require('rich-text');
var Quill = require('quill');
var QuillCursors = require('quill-cursors');

Quill.register('modules/cursors', QuillCursors);

sharedb.types.register(richText.type);

// Open WebSocket connection to ShareDB server
Expand All @@ -16,18 +20,92 @@ window.connect = function() {
connection.bindToSocket(socket);
};

// Helper functions for nicely displaying uid
function uidColor(uid) {
var colors = [
'red', 'blue', 'green', 'purple', 'orange',
'olive', 'maroon', 'yellow', 'lime', 'teal',
];
var n = parseInt(uid, 10);
var idx = n % 10;
return colors[idx];
}

function uidName(uid) {
return "User " + uid;
}

function renderNameplate(uid) {
var css = "background-color: " + uidColor(uid) + ";";
document.getElementById('nameplate').style = css;
document.getElementById('nameplate').innerText = uidName(uid);
}

// Create local Doc instance mapped to 'examples' collection document with id 'richtext'
var doc = connection.get('examples', 'richtext');


// Generate a random uid and display it.
var uid = String(Math.floor(Math.random() * 100000));
renderNameplate(uid);

doc.subscribe(function(err) {
if (err) throw err;
var quill = new Quill('#editor', {theme: 'snow'});
var quill = new Quill('#editor', {
theme: 'snow',
modules: {
cursors: true,
}
});

var cursors = quill.getModule('cursors');
cursors.createCursor(uid, uidName(uid), uidColor(uid));

quill.setContents(doc.data);
quill.on('text-change', function(delta, oldDelta, source) {
if (source !== 'user') return;
doc.submitOp(delta, {source: quill});
});

doc.on('op', function(op, source) {
if (source === quill) return;
quill.updateContents(op);
});

// When we receive information about updated presences,
// update the locall QuillCursor(s).
doc.on('presence', function(srcList, submitted) {
srcList.forEach(function(src) {
if (doc.presence[src]) {
var uid = doc.presence[src].u;
// TODO: Can QuillCursors support multiple selections?
var sel = doc.presence[src].s[0];

// Use Math.abs because the sharedb presence type
// supports reverse selections, but I don't think
// Quill Cursors does.
var len = Math.abs(sel[1] - sel[0]);

// Re-creating an existing cursor is a no-op
cursors.createCursor(uid, uidName(uid), uidColor(uid));
cursors.moveCursor(uid, { index: sel[0], length: len });
}
});
})

// When the local Quill selection changes, publish our new
// local presence data.
quill.on('selection-change', function(range, oldRange, source) {
if (range) {
doc.submitPresence({
u: uid,
c: 0,
s: [
[ range.index, range.index + range.length ],
]
});
} else {
// Cursor not in the editor
}
});
});
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