flymis/WebRoot/dojojs/src/widget/html/loader.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.widget.html.loader");

dojo.require("dojo.widget.HtmlWidget");
dojo.require("dojo.io.*");
dojo.require("dojo.lang.common");
dojo.require("dojo.lang.extras");

dojo.require("dojo.experimental");

// as this is a singleton dojo.declare doesn't buy us anything here
dojo.widget.html.loader = new (function(){
	// summary:
	// 	loading stuff moved out of contentpane to make it directly accessible by other widgets
	this.toString = function(){ return "dojo.widget.html.loader"; }
	var _loader = this;

	// back/forward tracking
	dojo.addOnLoad(function(){
		dojo.experimental(_loader.toString());
		var undo = dojo.evalObjPath("dojo.undo.browser");
		if(djConfig["preventBackButtonFix"] && undo && !undo.initialState){
			undo.setInitialState(new trackerObj);
		}
	});

	var logger = {};
	var trackerObj = function(id, data){
		this.id = id;
		this.data = data
	};
	trackerObj.prototype.handle = function(type){
		if(typeof dojo == 'undefined'){ return; } // wtf? how can dojo become undef?
		var wg = dojo.widget.byId(this.id);
		if(wg){ wg.setContent(this.data, true); }
	};

	this._log = function(widget, data){
		// if a loader widget B is a child of loader widget A
		// we need to destroy all of B's undo if we switch content
		if(widget.trackHistory){
			if(!logger[widget.widgetId]){
				logger[widget.widgetId] = { childrenIds: [], stack:[data] };
			}var children = logger[widget.widgetId].childrenIds;
			while(children && children.length){
				delete logger[children.pop()];
			}
			for(var child in widget.children){
				logger[widget.widgetId].childrenIds = child.widgetId;
			}
			dojo.undo.browser.addToHistory(new trackerObj(widget.widgetId, dojo.lang.shallowCopy(data, true)));