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82 lines
2.7 KiB
JavaScript
82 lines
2.7 KiB
JavaScript
define([], function () {
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var UNINIT = 'uninitialized';
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var create = function (sframeChan) {
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var meta = UNINIT;
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var myID = UNINIT;
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var members = [];
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var metadataObj = UNINIT;
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var dirty = true;
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var changeHandlers = [];
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var checkUpdate = function () {
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if (!dirty) { return; }
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if (meta === UNINIT) { throw new Error(); }
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if (myID === UNINIT) { myID = meta.myID; }
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if (metadataObj === UNINIT) {
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metadataObj = {
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defaultTitle: meta.doc.defaultTitle,
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title: meta.doc.defaultTitle,
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users: {}
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};
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}
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var mdo = {};
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// We don't want to add our user data to the object multiple times.
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var containsYou = false;
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console.log(metadataObj);
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Object.keys(metadataObj.users).forEach(function (x) {
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if (members.indexOf(x) === -1) { return; }
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mdo[x] = metadataObj.users[x];
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if (metadataObj.users[x].uid === meta.user.uid) {
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console.log('document already contains you');
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containsYou = true;
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}
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});
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if (!containsYou) { mdo[myID] = meta.user; }
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metadataObj.users = mdo;
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dirty = false;
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changeHandlers.forEach(function (f) { f(); });
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};
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var change = function () {
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dirty = true;
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setTimeout(checkUpdate);
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};
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sframeChan.on('EV_METADATA_UPDATE', function (ev) {
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meta = ev;
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change();
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});
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sframeChan.on('EV_RT_CONNECT', function (ev) {
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myID = ev.myID;
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members = ev.members;
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change();
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});
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sframeChan.on('EV_RT_JOIN', function (ev) {
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members.push(ev);
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change();
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});
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sframeChan.on('EV_RT_LEAVE', function (ev) {
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var idx = members.indexOf(ev);
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if (idx === -1) { console.log('Error: ' + ev + ' not in members'); return; }
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members.splice(idx, 1);
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change();
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});
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sframeChan.on('EV_RT_DISCONNECT', function () {
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members = [];
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change();
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});
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return Object.freeze({
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updateMetadata: function (m) {
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if (JSON.stringify(metadataObj) === JSON.stringify(m)) { return; }
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metadataObj = m;
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change();
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},
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getMetadata: function () {
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checkUpdate();
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return metadataObj;
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},
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onChange: function (f) { changeHandlers.push(f); }
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});
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};
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return Object.freeze({ create: create });
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}); |