Ooui-tws-port/Ooui/Client.js

246 lines
6.0 KiB
JavaScript

var debug = false;
const nodes = {};
let socket = null;
const mouseEvents = {
click: true,
dblclick: true,
mousedown: true,
mouseenter: true,
mouseleave: true,
mousemove: true,
mouseout: true,
mouseover: true,
mouseup: true,
wheel: true,
};
// Try to close the socket gracefully
window.onbeforeunload = function() {
if (socket != null) {
socket.close (1001, "Unloading page");
socket = null;
console.log ("Web socket closed");
}
return null;
}
function getSize () {
return {
height: window.innerHeight,
width: window.innerWidth
};
}
// Main entrypoint
function ooui (rootElementPath) {
var opened = false;
var initialSize = getSize ();
var wsArgs = (rootElementPath.indexOf("?") >= 0 ? "&" : "?") +
"w=" + initialSize.width + "&h=" + initialSize.height;
socket = new WebSocket ("ws://" + document.location.host + rootElementPath + wsArgs, "ooui");
socket.addEventListener ("open", function (event) {
console.log ("Web socket opened");
opened = true;
});
socket.addEventListener ("error", function (event) {
console.error ("Web socket error", event);
});
socket.addEventListener ("close", function (event) {
console.error ("Web socket close", event);
if (opened) {
location.reload ();
}
});
socket.addEventListener("message", function (event) {
const messages = JSON.parse (event.data);
if (debug) console.log("Messages", messages);
if (Array.isArray (messages)) {
messages.forEach (function (m) {
// console.log('Raw value from server', m.v);
m.v = fixupValue (m.v);
processMessage (m);
});
}
});
console.log("Web socket created");
// Throttled window resize event
(function() {
window.addEventListener("resize", resizeThrottler, false);
var resizeTimeout;
function resizeThrottler() {
if (!resizeTimeout) {
resizeTimeout = setTimeout(function() {
resizeTimeout = null;
resizeHandler();
}, 100);
}
}
function resizeHandler() {
const em = {
m: "event",
id: 42,
k: "window.resize",
v: getSize (),
};
const ems = JSON.stringify (em);
if (socket != null)
socket.send (ems);
if (debug) console.log ("Event", em);
}
}());
}
function getNode (id) {
switch (id) {
case "window": return window;
case "document": return document;
case "document.body":
const bodyNode = document.getElementById ("ooui-body");
return bodyNode || document.body;
default: return nodes[id];
}
}
function msgCreate (m) {
const id = m.id;
const tagName = m.k;
const node = tagName === "#text" ?
document.createTextNode ("") :
document.createElement (tagName);
if (tagName !== "#text")
node.id = id;
nodes[id] = node;
if (debug) console.log ("Created node", node);
}
function msgSet (m) {
const id = m.id;
const node = getNode (id);
if (!node) {
console.error ("Unknown node id", m);
return;
}
const parts = m.k.split(".");
let o = node;
for (let i = 0; i < parts.length - 1; i++) {
o = o[parts[i]];
}
const lastPart = parts[parts.length - 1];
const value = lastPart === "htmlFor" ? m.v.id : m.v;
o[lastPart] = value;
if (debug) console.log ("Set", node, parts, value);
}
function msgSetAttr (m) {
const id = m.id;
const node = getNode (id);
if (!node) {
console.error ("Unknown node id", m);
return;
}
node.setAttribute(m.k, m.v);
if (debug) console.log ("SetAttr", node, m.k, m.v);
}
function msgCall (m) {
const id = m.id;
const node = getNode (id);
if (!node) {
console.error ("Unknown node id", m);
return;
}
const f = node[m.k];
if (debug) console.log ("Call", node, f, m.v);
const r = f.apply (node, m.v);
if (typeof m.rid === 'string' || m.rid instanceof String) {
nodes[m.rid] = r;
}
}
function msgListen (m) {
const node = getNode (m.id);
if (!node) {
console.error ("Unknown node id", m);
return;
}
if (debug) console.log ("Listen", node, m.k);
node.addEventListener(m.k, function (e) {
const em = {
m: "event",
id: m.id,
k: m.k,
};
if (m.k === "change" || m.k === "input") {
em.v = (node.tagName === "INPUT" && node.type === "checkbox") ?
node.checked :
node.value;
}
else if (mouseEvents[m.k]) {
em.v = {
offsetX: e.offsetX,
offsetY: e.offsetY,
};
}
const ems = JSON.stringify (em);
if (socket != null)
socket.send (ems);
if (debug) console.log ("Event", em);
if (em.k === "submit")
e.preventDefault ();
});
}
function processMessage (m) {
switch (m.m) {
case "nop":
break;
case "create":
msgCreate (m);
break;
case "set":
msgSet (m);
break;
case "setAttr":
msgSetAttr (m);
break;
case "call":
msgCall (m);
break;
case "listen":
msgListen (m);
break;
default:
console.error ("Unknown message type", m.m, m);
}
}
function fixupValue (v) {
if (Array.isArray (v)) {
for (x in v) {
v[x] = fixupValue (v[x]);
}
return v;
}
else if (typeof v === 'string' || v instanceof String) {
if ((v.length > 1) && (v[0] === "\u2999")) {
// console.log("V", v);
return getNode (v);
}
}
return v;
}