UFO.js

/* Unobtrusive Flash Objects (UFO) v3.22
Copyright 2005-2007 MIchael Devon JONES
This software is licensed under the CC-GNU LGPL

CONTAINS MINOR CHANGE FOR MOODLE (bottom code for MDL-9825)
*/

var UFO = {
req: [“movie”, “width”, “height”, “majorversion”, “build”],
opt: [“play”, “loop”, “menu”, “quality”, “scale”, “salign”, “wmode”, “bgcolor”, “base”, “flashvars”, “devicefont”, “allowscriptaccess”, “seamlesstabbing”, “allowfullscreen”, “allownetworking”],
optAtt: [“id”, “name”, “align”],
optExc: [“swliveconnect”],
ximovie: “ufo.swf”,
xiwidth: “215”,
xiheight: “138”,
ua: navigator.userAgent.toLowerCase(),
pluginType: “”,
fv: [0,0],
foList: [],

create: function(FO, id) {
if (!UFO.uaHas(“w3cdom”) || UFO.uaHas(“ieMac”)) return;
UFO.getFlashVersion();
UFO.foList[id] = UFO.updateFO(FO);
UFO.createCSS(“#” + id, “visibility:hidden;”);
UFO.domLoad(id);
},

updateFO: function(FO) {
if (typeof FO.xi != “undefined” && FO.xi == “true”) {
if (typeof FO.ximovie == “undefined”) FO.ximovie = UFO.ximovie;
if (typeof FO.xiwidth == “undefined”) FO.xiwidth = UFO.xiwidth;
if (typeof FO.xiheight == “undefined”) FO.xiheight = UFO.xiheight;
}
FO.mainCalled = false;
return FO;
},

domLoad: function(id) {
var _t = setInterval(function() {
if ((document.getElementsByTagName(“body”)[0] != null || document.body != null) && document.getElementById(id) != null) {
UFO.main(id);
clearInterval(_t);
}
}, 250);
if (typeof document.addEventListener != “undefined”) {
document.addEventListener(“DOMContentLoaded”, function() { UFO.main(id); clearInterval(_t); } , null); // Gecko, Opera 9+
}
},

main: function(id) {
var _fo = UFO.foList[id];
if (_fo.mainCalled) return;
UFO.foList[id].mainCalled = true;
document.getElementById(id).style.visibility = “hidden”;
if (UFO.hasRequired(id)) {
if (UFO.hasFlashVersion(parseInt(_fo.majorversion, 10), parseInt(_fo.build, 10))) {
if (typeof _fo.setcontainercss != “undefined” && _fo.setcontainercss == “true”) UFO.setContainerCSS(id);
UFO.writeSWF(id);
}
else if (_fo.xi == “true” && UFO.hasFlashVersion(6, 65)) {
UFO.createDialog(id);
}
}
document.getElementById(id).style.visibility = “visible”;
},

createCSS: function(selector, declaration) {
var _h = document.getElementsByTagName(“head”)[0];
var _s = UFO.createElement(“style”);
if (!UFO.uaHas(“ieWin”)) _s.appendChild(document.createTextNode(selector + ” {” + declaration + “}”)); // bugs in IE/Win
_s.setAttribute(“type”, “text/css”);
_s.setAttribute(“media”, “screen”);
_h.appendChild(_s);
if (UFO.uaHas(“ieWin”) && document.styleSheets && document.styleSheets.length > 0) {
var _ls = document.styleSheets[document.styleSheets.length – 1];
if (typeof _ls.addRule == “object”) _ls.addRule(selector, declaration);
}
},

setContainerCSS: function(id) {
var _fo = UFO.foList[id];
var _w = /%/.test(_fo.width) ? “” : “px”;
var _h = /%/.test(_fo.height) ? “” : “px”;
UFO.createCSS(“#” + id, “width:” + _fo.width + _w +”; height:” + _fo.height + _h +”;”);
if (_fo.width == “100%”) {
UFO.createCSS(“body”, “margin-left:0; margin-right:0; padding-left:0; padding-right:0;”);
}
if (_fo.height == “100%”) {
UFO.createCSS(“html”, “height:100%; overflow:hidden;”);
UFO.createCSS(“body”, “margin-top:0; margin-bottom:0; padding-top:0; padding-bottom:0; height:100%;”);
}
},

createElement: function(el) {
return (UFO.uaHas(“xml”) && typeof document.createElementNS != “undefined”) ? document.createElementNS(“http://www.w3.org/1999/xhtml”, el) : document.createElement(el);
},

createObjParam: function(el, aName, aValue) {
var _p = UFO.createElement(“param”);
_p.setAttribute(“name”, aName);
_p.setAttribute(“value”, aValue);
el.appendChild(_p);
},

uaHas: function(ft) {
var _u = UFO.ua;
switch(ft) {
case “w3cdom”:
return (typeof document.getElementById != “undefined” && typeof document.getElementsByTagName != “undefined” && (typeof document.createElement != “undefined” || typeof document.createElementNS != “undefined”));
case “xml”:
var _m = document.getElementsByTagName(“meta”);
var _l = _m.length;
for (var i = 0; i < _l; i++) {
if (/content-type/i.test(_m[i].getAttribute(“http-equiv”)) && /xml/i.test(_m[i].getAttribute(“content”))) return true;
}
return false;
case “ieMac”:
return /msie/.test(_u) && !/opera/.test(_u) && /mac/.test(_u);
case “ieWin”:
return /msie/.test(_u) && !/opera/.test(_u) && /win/.test(_u);
case “gecko”:
return /gecko/.test(_u) && !/applewebkit/.test(_u);
case “opera”:
return /opera/.test(_u);
case “safari”:
return /applewebkit/.test(_u);
default:
return false;
}
},

getFlashVersion: function() {
    if (UFO.fv[0] != 0) return;  
    if (navigator.plugins &amp;&amp; typeof navigator.plugins["Shockwave Flash"] == "object") {
        UFO.pluginType = "npapi";
        var _d = navigator.plugins["Shockwave Flash"].description;
        if (typeof _d != "undefined") {
            _d = _d.replace(/^.*\s+(\S+\s+\S+$)/, "$1");
            var _m = parseInt(_d.replace(/^(.*)\..*$/, "$1"), 10);
            var _r = /r/.test(_d) ? parseInt(_d.replace(/^.*r(.*)$/, "$1"), 10) : 0;
            UFO.fv = [_m, _r];
        }
    }
    else if (window.ActiveXObject) {
        UFO.pluginType = "ax";
        try { // avoid fp 6 crashes
            var _a = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.7");
        }
        catch(e) {
            try { 
                var _a = new ActiveXObject("ShockwaveFlash.ShockwaveFlash.6");
                UFO.fv = [6, 0];
                _a.AllowScriptAccess = "always"; // throws if fp &lt; 6.47 
            }
            catch(e) {
                if (UFO.fv[0] == 6) return;
            }
            try {
                var _a = new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
            }
            catch(e) {}
        }
        if (typeof _a == "object") {
            var _d = _a.GetVariable("$version"); // bugs in fp 6.21/6.23
            if (typeof _d != "undefined") {
                _d = _d.replace(/^\S+\s+(.*)$/, "$1").split(",");
                UFO.fv = [parseInt(_d[0], 10), parseInt(_d[2], 10)];
            }
        }
    }
},

hasRequired: function(id) {
    var _l = UFO.req.length;
    for (var i = 0; i &lt; _l; i++) {
        if (typeof UFO.foList[id][UFO.req[i]] == "undefined") return false;
    }
    return true;
},

hasFlashVersion: function(major, release) {
    return (UFO.fv[0] &gt; major || (UFO.fv[0] == major &amp;&amp; UFO.fv[1] &gt;= release)) ? true : false;

},

writeSWF: function(id) {
var _fo = UFO.foList[id];
var _e = document.getElementById(id);
if (UFO.pluginType == “npapi”) {
if (UFO.uaHas(“gecko”) || UFO.uaHas(“xml”)) {
while(_e.hasChildNodes()) {
_e.removeChild(_e.firstChild);
}
var _obj = UFO.createElement(“object”);
_obj.setAttribute(“type”, “application/x-shockwave-flash”);
_obj.setAttribute(“data”, _fo.movie);
_obj.setAttribute(“width”, _fo.width);
_obj.setAttribute(“height”, _fo.height);
var _l = UFO.optAtt.length;
for (var i = 0; i < _l; i++) {
if (typeof _fo[UFO.optAtt[i]] != “undefined”) _obj.setAttribute(UFO.optAtt[i], _fo[UFO.optAtt[i]]);
}
var _o = UFO.opt.concat(UFO.optExc);
var _l = _o.length;
for (var i = 0; i < _l; i++) {
if (typeof _fo[_o[i]] != “undefined”) UFO.createObjParam(_obj, _o[i], _fo[_o[i]]);
}
_e.appendChild(_obj);
}
else {
var _emb = “”;
var _o = UFO.opt.concat(UFO.optAtt).concat(UFO.optExc);
var _l = _o.length;
for (var i = 0; i < _l; i++) {
if (typeof _fo[_o[i]] != “undefined”) _emb += ‘ ‘ + _o[i] + ‘=”‘ + _fo[_o[i]] + ‘”‘;
}
_e.innerHTML = ”;
}
}
else if (UFO.pluginType == “ax”) {
var _objAtt = “”;
var _l = UFO.optAtt.length;
for (var i = 0; i < _l; i++) {
if (typeof _fo[UFO.optAtt[i]] != “undefined”) _objAtt += ‘ ‘ + UFO.optAtt[i] + ‘=”‘ + _fo[UFO.optAtt[i]] + ‘”‘;
}
var _objPar = “”;
var _l = UFO.opt.length;
for (var i = 0; i < _l; i++) {
if (typeof _fo[UFO.opt[i]] != “undefined”) _objPar += ‘‘;
}
var _p = window.location.protocol == “https:” ? “https:” : “http:”;
_e.innerHTML = ‘‘ + _objPar + ‘‘;
}
},

createDialog: function(id) {
var _fo = UFO.foList[id];
UFO.createCSS(“html”, “height:100%; overflow:hidden;”);
UFO.createCSS(“body”, “height:100%; overflow:hidden;”);
UFO.createCSS(“#xi-con”, “position:absolute; left:0; top:0; z-index:1000; width:100%; height:100%; background-color:#fff; filter:alpha(opacity:75); opacity:0.75;”);
UFO.createCSS(“#xi-dia”, “position:absolute; left:50%; top:50%; margin-left: -” + Math.round(parseInt(_fo.xiwidth, 10) / 2) + “px; margin-top: -” + Math.round(parseInt(_fo.xiheight, 10) / 2) + “px; width:” + _fo.xiwidth + “px; height:” + _fo.xiheight + “px;”);
var _b = document.getElementsByTagName(“body”)[0];
var _c = UFO.createElement(“div”);
_c.setAttribute(“id”, “xi-con”);
var _d = UFO.createElement(“div”);
_d.setAttribute(“id”, “xi-dia”);
_c.appendChild(_d);
_b.appendChild(_c);
var _mmu = window.location;
if (UFO.uaHas(“xml”) && UFO.uaHas(“safari”)) {
var _mmd = document.getElementsByTagName(“title”)[0].firstChild.nodeValue = document.getElementsByTagName(“title”)[0].firstChild.nodeValue.slice(0, 47) + ” – Flash Player Installation”;
}
else {
var _mmd = document.title = document.title.slice(0, 47) + ” – Flash Player Installation”;
}
var _mmp = UFO.pluginType == “ax” ? “ActiveX” : “PlugIn”;
var _uc = typeof _fo.xiurlcancel != “undefined” ? “&xiUrlCancel=” + _fo.xiurlcancel : “”;
var _uf = typeof _fo.xiurlfailed != “undefined” ? “&xiUrlFailed=” + _fo.xiurlfailed : “”;
UFO.foList[“xi-dia”] = { movie:_fo.ximovie, width:_fo.xiwidth, height:_fo.xiheight, majorversion:”6″, build:”65″, flashvars:”MMredirectURL=” + _mmu + “&MMplayerType=” + _mmp + “&MMdoctitle=” + _mmd + _uc + _uf };
UFO.writeSWF(“xi-dia”);
},

expressInstallCallback: function() {
var _b = document.getElementsByTagName(“body”)[0];
var _c = document.getElementById(“xi-con”);
_b.removeChild(_c);
UFO.createCSS(“body”, “height:auto; overflow:auto;”);
UFO.createCSS(“html”, “height:auto; overflow:auto;”);
},

cleanupIELeaks: function() {
var _o = document.getElementsByTagName(“object”);
var _l = _o.length
for (var i = 0; i < _l; i++) {
_o[i].style.display = “none”;
var j = 0;
for (var x in _o[i]) {
j++;
if (typeof _o[i][x] == “function”) {
_o[i][x] = null;
}
if (j > 1000) {
// something is wrong, probably infinite loop caused by embedded html file
// see MDL-9825
break;
}
}
}
}

};

if (typeof window.attachEvent != “undefined” && UFO.uaHas(“ieWin”)) {
window.attachEvent(“onunload”, UFO.cleanupIELeaks);
}