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-/* ************************************************************************
-
- qooxdoo - the new era of web development
-
- http://qooxdoo.org
-
- Copyright:
- 2004-2006 by 1&1 Internet AG, Germany, http://www.1and1.org
-
- License:
- LGPL 2.1: http://www.gnu.org/licenses/lgpl.html
-
- Authors:
- * Sebastian Werner (wpbasti)
- * Andreas Ecker (ecker)
-
-************************************************************************ */
-
-/* ************************************************************************
-
-#resource(html:static/history)
-#require(qx.manager.object.AliasManager)
-
-************************************************************************ */
-
-/**
- * A helper for using the browser history in JavaScript Applications without
- * reloading the main page.
- * <p>
- * Adds entries to the browser history and fires a "request" event when one of
- * the entries was requested by the user (e.g. by clicking on the back button).
- * </p>
- *
- * @event request {qx.event.type.DataEvent} Fired when the user moved in the
- * history. The data property of the event holds the command, which was
- * passed to {@link #addToHistory}.
- */
-qx.OO.defineClass("qx.client.History", qx.core.Target,
-function() {
- qx.core.Target.call(this);
-
- this._pageFlag = true;
-});
-
-
-/**
- * Initializes the History. This method has to called by applications using this
- * class once during initialization. Subsequent calls have no (negative) effect.
- */
-qx.Proto.init = function() {
- if (this._iframe == null) {
- this._iframe = document.createElement("iframe");
- this._iframe.style.visibility = "hidden";
- document.body.appendChild(this._iframe);
- }
-}
-
-
-/**
- * Adds an entry to the browser history.
- *
- * @param command {string} a string representing the old state of the
- * application. This command will be delivered in the data property of
- * the "request" event.
- * @param newTitle {string ? null} the page title to set after the history entry
- * is done. This title should represent the new state of the application.
- */
-qx.Proto.addToHistory = function(command, newTitle) {
- if (command == this._currentCommand) {
- document.title = newTitle;
- } else {
- if (this._iframe == null) {
- throw new Error("You have to call init first!");
- }
-
- this._pageFlag = !this._pageFlag;
- this._currentCommand = command;
- this._newTitle = newTitle;
-
- // NOTE: We need the command attribute to enforce a loading of the page
- // (Otherwise we don't get an onload event).
- // The browser will still cache commands loaded once.
- // Without the onload-problem anchors would work, too.
- // (Anchors would have the advantage that the helper is only loaded once)
- this._iframe.src = this.getSetting("helperFile") + "?c=" + command;
- }
-}
-
-
-/**
- * Event handler. Called when the history helper page was loaded.
- *
- * @param location {Map} the location property of the window object of the
- * helper page.
- */
-qx.Proto._onHistoryLoad = function(location)
-{
- try {
- var equalsPos = location.search.indexOf("=");
- var command = location.search.substring(equalsPos + 1);
-
- if (this._newTitle) {
- document.title = this._newTitle;
- this._newTitle = null;
- }
-
- if (command != this._currentCommand) {
- this._currentCommand = command;
-
- this.createDispatchDataEvent("request", command);
- }
- } catch (exc) {
- this.error("Handling history load failed", exc);
- }
-
- qx.ui.core.Widget.flushGlobalQueues();
-}
-
-
-/** The URL to the helper page. */
-qx.Settings.setDefault("helperFile", qx.Settings.getValueOfClass("qx.manager.object.AliasManager", "staticUri") + "/history/historyHelper.html");
-
-
-
-
-
-
-/*
----------------------------------------------------------------------------
- DEFER SINGLETON INSTANCE
----------------------------------------------------------------------------
-*/
-
-/**
- * Singleton Instance Getter
- */
-qx.Class.getInstance = qx.util.Return.returnInstance;