mathjax.mathjax.js

/*
	mathjax.js - A mathJax Module. Needs JOBAD 3.2
	
	Copyright (C) 2013 KWARC Group <kwarc.info>
	
	This file is part of JOBAD.
	
	JOBAD is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	
	JOBAD is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.
	
	You should have received a copy of the GNU General Public License
	along with JOBAD.  If not, see <http://www.gnu.org/licenses/>.
*/
jQuery( document ).ready( function( $ ) {
	JOBAD.modules.register({
		info:{
			'identifier':	'mathjax.mathjax',
			'title':	'MathJax',
			'author':	'Tom Wiesing',
			'description':	'Loads MathJax is MATHML is not supported by the current browser. ',
			'async': true //we are async
		},
		globalinit: function(next){
			if(typeof this.globalStore.get("useMathML") != "boolean"){
				var agent = navigator.userAgent;
				var canMathML = ((agent.indexOf('Gecko') > -1) && (agent.indexOf('KHTML') === -1)
						 || agent.match(/MathPlayer/) );

				this.globalStore.set("useMathML", canMathML?false:true); //can the browser do MathML?
			}			

			if(!this.globalStore.get("useMathML")){ //we can do mathml, we dont need to do stuff
				this.UserConfig.setMessage("MathML is currently used to render Math. "); //set a nice message in the config UI
				return next();
			}
			
			this.UserConfig.setMessage("MathJax is currently used to render Math. "); //set a nice message in the config UI

			JOBAD.util.loadExternalJS("http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML", function(){
				//setup mathjax with the right options
				MathJax.Hub.Config({
				  jax: ["input/MathML", "output/HTML-CSS","output/NativeMML"],
				  menuSettings: { context: "Browser" }, //use JOABD ContatMenu not the one from MathJax
				  skipStartupTypeset: true
				});

				next();
			});
		},
		activate: function(JOBADInstance){
			if(!this.globalStore.get("useMathML")){ //we can do mathml, we dont need to do stuff
				return;
			}

			JOBADInstance.element.each(function(){
				MathJax.Hub.Queue(["Typeset",MathJax.Hub, this]);
			});

			MathJax.Hub.Queue([function(){
				JOBADInstance.Sidebar.redraw(); //We will have to redraw the sidebar. 
			}]);
		}, 
		deactivate: function(JOBADInstance){
			if(!this.globalStore.get("useMathML")){ //we can do mathml, we dont need to do stuff
				return;
			}

			//disable it for every rendered thing. 
			JOBADInstance.element.each(function(){
				var allMath = MathJax.Hub.getAllJax(this);

				for(var i=0;i<allMath.length;i++){
					(function(){
						var me = allMath[i];
						var text = JOBAD.refs.$(me.originalText);
						var source = JOBAD.refs.$("#"+me.inputID);

						MathJax.Hub.Queue(["Remove",allMath[i]]);
						MathJax.Hub.Queue([function(){
							source.replaceWith(text);
						}]);
					})();
				}
				
				MathJax.Hub.Queue([function(){
					JOBADInstance.Sidebar.redraw(); //We will have to redraw the sidebar. 
				}]);
			});
		}
	});
});