Subversion Repositories eFlore/Applications.moissonnage

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6 delphine 1 
L.DeferredLayer = L.LayerGroup.extend({
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	options: {
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		js: [],
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		init: null
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	},
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	_script_cache: {},
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	initialize: function(options) {
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		L.Util.setOptions(this, options);
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		L.LayerGroup.prototype.initialize.apply(this);
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		this._loaded = false;
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	},
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	onAdd: function(map) {
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		L.LayerGroup.prototype.onAdd.apply(this, [map]);
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		if (this._loaded) return;
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		//console.info("Script cache", this._script_cache);
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		var loaded = function() {
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			//console.info("Loaded", this, this.options);
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			this._loaded = true;
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			var l = this.options.init();
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			if (l)
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				this.addLayer(l);
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		}
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		this._loadScripts(this.options.js.reverse(), L.Util.bind(loaded, this));
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	},
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	_loadScripts: function(scripts, cb, args) {
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		if (!scripts || scripts.length == 0)
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			return cb(args);
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		var _this = this, s = scripts.pop(), c;
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		c = this._script_cache[s];
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		if (c === undefined) {
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			c = {url: s, wait: []};
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			//console.info("Load ", s);
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			var script = document.createElement('script');
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			script.src = s;
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			script.type = 'text/javascript';
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			script.onload = function () {
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				//console.info("Element(cb)", c.e.readyState);
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				c.e.readyState = "completed";
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				var i = 0;
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				for (i = 0; i < c.wait.length; i++)
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					c.wait[i]();
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			}
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			c.e = script;
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			document.getElementsByTagName('head')[0].appendChild(script);
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		}
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		function _cb() { _this._loadScripts(scripts, cb, args); }
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		c.wait.push(_cb);
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		//console.info("Element", c.e.readyState);
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		if (c.e.readyState == "completed")
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			_cb();
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		this._script_cache[s] = c;
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	}
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});