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1318 alexandre_ 1
/*
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	Copyright (c) 2004-2006, The Dojo Foundation
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	All Rights Reserved.
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	Licensed under the Academic Free License version 2.1 or above OR the
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	modified BSD license. For more information on Dojo licensing, see:
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		http://dojotoolkit.org/community/licensing.shtml
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*/
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dojo.provide("dojo.undo.browser");
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dojo.require("dojo.io.common");
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try {
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	if ((!djConfig["preventBackButtonFix"]) && (!dojo.hostenv.post_load_)) {
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		document.write("<iframe style='border: 0px; width: 1px; height: 1px; position: absolute; bottom: 0px; right: 0px; visibility: visible;' name='djhistory' id='djhistory' src='" + (djConfig["dojoIframeHistoryUrl"] || dojo.hostenv.getBaseScriptUri() + "iframe_history.html") + "'></iframe>");
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	}
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}
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catch (e) {
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}
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if (dojo.render.html.opera) {
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	dojo.debug("Opera is not supported with dojo.undo.browser, so back/forward detection will not work.");
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}
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dojo.undo.browser = {initialHref:(!dj_undef("window")) ? window.location.href : "", initialHash:(!dj_undef("window")) ? window.location.hash : "", moveForward:false, historyStack:[], forwardStack:[], historyIframe:null, bookmarkAnchor:null, locationTimer:null, setInitialState:function (args) {
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	this.initialState = this._createState(this.initialHref, args, this.initialHash);
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}, addToHistory:function (args) {
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	this.forwardStack = [];
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	var hash = null;
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	var url = null;
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	if (!this.historyIframe) {
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		if (djConfig["useXDomain"] && !djConfig["dojoIframeHistoryUrl"]) {
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			dojo.debug("dojo.undo.browser: When using cross-domain Dojo builds," + " please save iframe_history.html to your domain and set djConfig.dojoIframeHistoryUrl" + " to the path on your domain to iframe_history.html");
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		}
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		this.historyIframe = window.frames["djhistory"];
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	}
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	if (!this.bookmarkAnchor) {
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		this.bookmarkAnchor = document.createElement("a");
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		dojo.body().appendChild(this.bookmarkAnchor);
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		this.bookmarkAnchor.style.display = "none";
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	}
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	if (args["changeUrl"]) {
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		hash = "#" + ((args["changeUrl"] !== true) ? args["changeUrl"] : (new Date()).getTime());
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		if (this.historyStack.length == 0 && this.initialState.urlHash == hash) {
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			this.initialState = this._createState(url, args, hash);
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			return;
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		} else {
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			if (this.historyStack.length > 0 && this.historyStack[this.historyStack.length - 1].urlHash == hash) {
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				this.historyStack[this.historyStack.length - 1] = this._createState(url, args, hash);
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				return;
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			}
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		}
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		this.changingUrl = true;
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		setTimeout("window.location.href = '" + hash + "'; dojo.undo.browser.changingUrl = false;", 1);
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		this.bookmarkAnchor.href = hash;
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		if (dojo.render.html.ie) {
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			url = this._loadIframeHistory();
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			var oldCB = args["back"] || args["backButton"] || args["handle"];
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			var tcb = function (handleName) {
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				if (window.location.hash != "") {
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					setTimeout("window.location.href = '" + hash + "';", 1);
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				}
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				oldCB.apply(this, [handleName]);
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			};
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			if (args["back"]) {
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				args.back = tcb;
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			} else {
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				if (args["backButton"]) {
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					args.backButton = tcb;
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				} else {
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					if (args["handle"]) {
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						args.handle = tcb;
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					}
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				}
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			}
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			var oldFW = args["forward"] || args["forwardButton"] || args["handle"];
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			var tfw = function (handleName) {
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				if (window.location.hash != "") {
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					window.location.href = hash;
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				}
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				if (oldFW) {
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					oldFW.apply(this, [handleName]);
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				}
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			};
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			if (args["forward"]) {
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				args.forward = tfw;
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			} else {
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				if (args["forwardButton"]) {
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					args.forwardButton = tfw;
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				} else {
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					if (args["handle"]) {
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						args.handle = tfw;
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					}
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				}
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			}
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		} else {
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			if (dojo.render.html.moz) {
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				if (!this.locationTimer) {
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					this.locationTimer = setInterval("dojo.undo.browser.checkLocation();", 200);
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				}
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			}
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		}
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	} else {
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		url = this._loadIframeHistory();
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	}
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	this.historyStack.push(this._createState(url, args, hash));
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}, checkLocation:function () {
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	if (!this.changingUrl) {
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		var hsl = this.historyStack.length;
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		if ((window.location.hash == this.initialHash || window.location.href == this.initialHref) && (hsl == 1)) {
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			this.handleBackButton();
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			return;
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		}
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		if (this.forwardStack.length > 0) {
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			if (this.forwardStack[this.forwardStack.length - 1].urlHash == window.location.hash) {
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				this.handleForwardButton();
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				return;
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			}
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		}
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		if ((hsl >= 2) && (this.historyStack[hsl - 2])) {
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			if (this.historyStack[hsl - 2].urlHash == window.location.hash) {
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				this.handleBackButton();
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				return;
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			}
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		}
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	}
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}, iframeLoaded:function (evt, ifrLoc) {
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	if (!dojo.render.html.opera) {
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		var query = this._getUrlQuery(ifrLoc.href);
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		if (query == null) {
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			if (this.historyStack.length == 1) {
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				this.handleBackButton();
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			}
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			return;
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		}
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		if (this.moveForward) {
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			this.moveForward = false;
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			return;
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		}
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		if (this.historyStack.length >= 2 && query == this._getUrlQuery(this.historyStack[this.historyStack.length - 2].url)) {
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			this.handleBackButton();
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		} else {
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			if (this.forwardStack.length > 0 && query == this._getUrlQuery(this.forwardStack[this.forwardStack.length - 1].url)) {
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				this.handleForwardButton();
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			}
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		}
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	}
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}, handleBackButton:function () {
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	var current = this.historyStack.pop();
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	if (!current) {
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		return;
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	}
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	var last = this.historyStack[this.historyStack.length - 1];
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	if (!last && this.historyStack.length == 0) {
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		last = this.initialState;
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	}
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	if (last) {
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		if (last.kwArgs["back"]) {
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			last.kwArgs["back"]();
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		} else {
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			if (last.kwArgs["backButton"]) {
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				last.kwArgs["backButton"]();
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			} else {
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				if (last.kwArgs["handle"]) {
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					last.kwArgs.handle("back");
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				}
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			}
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		}
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	}
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	this.forwardStack.push(current);
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}, handleForwardButton:function () {
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	var last = this.forwardStack.pop();
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	if (!last) {
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		return;
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	}
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	if (last.kwArgs["forward"]) {
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		last.kwArgs.forward();
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	} else {
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		if (last.kwArgs["forwardButton"]) {
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			last.kwArgs.forwardButton();
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		} else {
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			if (last.kwArgs["handle"]) {
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				last.kwArgs.handle("forward");
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			}
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		}
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	}
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	this.historyStack.push(last);
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}, _createState:function (url, args, hash) {
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	return {"url":url, "kwArgs":args, "urlHash":hash};
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}, _getUrlQuery:function (url) {
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	var segments = url.split("?");
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	if (segments.length < 2) {
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		return null;
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	} else {
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		return segments[1];
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	}
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}, _loadIframeHistory:function () {
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	var url = (djConfig["dojoIframeHistoryUrl"] || dojo.hostenv.getBaseScriptUri() + "iframe_history.html") + "?" + (new Date()).getTime();
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	this.moveForward = true;
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	dojo.io.setIFrameSrc(this.historyIframe, url, false);
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	return url;
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}};
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