flymis/WebRoot/dojojs/src/undo/Manager.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.undo.Manager");
dojo.require("dojo.lang.common");

dojo.undo.Manager = function(parent) {
	this.clear();
	this._parent = parent;
};
dojo.extend(dojo.undo.Manager, {
	_parent: null,
	_undoStack: null,
	_redoStack: null,
	_currentManager: null,

	canUndo: false,
	canRedo: false,

	isUndoing: false,
	isRedoing: false,

	// these events allow you to hook in and update your code (UI?) as necessary
	onUndo: function(manager, item) {},
	onRedo: function(manager, item) {},

	// fired when you do *any* undo action, which means you'll have one for every item
	// in a transaction. this is usually only useful for debugging
	onUndoAny: function(manager, item) {},
	onRedoAny: function(manager, item) {},

	_updateStatus: function() {
		this.canUndo = this._undoStack.length > 0;
		this.canRedo = this._redoStack.length > 0;
	},

	clear: function() {
		this._undoStack = [];
		this._redoStack = [];
		this._currentManager = this;

		this.isUndoing = false;
		this.isRedoing = false;

		this._updateStatus();
	},

	undo: function() {
		if(!this.canUndo) { return false; }

		this.endAllTransactions();

		this.isUndoing = true;