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alexandre_ |
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/*
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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.Manager");
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dojo.require("dojo.lang.common");
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dojo.undo.Manager = function (parent) {
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this.clear();
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this._parent = parent;
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};
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dojo.extend(dojo.undo.Manager, {_parent:null, _undoStack:null, _redoStack:null, _currentManager:null, canUndo:false, canRedo:false, isUndoing:false, isRedoing:false, onUndo:function (manager, item) {
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}, onRedo:function (manager, item) {
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}, onUndoAny:function (manager, item) {
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}, onRedoAny:function (manager, item) {
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}, _updateStatus:function () {
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this.canUndo = this._undoStack.length > 0;
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this.canRedo = this._redoStack.length > 0;
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}, clear:function () {
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this._undoStack = [];
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this._redoStack = [];
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this._currentManager = this;
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this.isUndoing = false;
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this.isRedoing = false;
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this._updateStatus();
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}, undo:function () {
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if (!this.canUndo) {
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return false;
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}
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this.endAllTransactions();
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this.isUndoing = true;
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var top = this._undoStack.pop();
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if (top instanceof dojo.undo.Manager) {
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top.undoAll();
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} else {
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top.undo();
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}
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if (top.redo) {
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this._redoStack.push(top);
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}
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this.isUndoing = false;
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this._updateStatus();
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this.onUndo(this, top);
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if (!(top instanceof dojo.undo.Manager)) {
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this.getTop().onUndoAny(this, top);
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}
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return true;
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}, redo:function () {
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if (!this.canRedo) {
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return false;
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}
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this.isRedoing = true;
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var top = this._redoStack.pop();
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if (top instanceof dojo.undo.Manager) {
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top.redoAll();
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} else {
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top.redo();
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}
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this._undoStack.push(top);
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this.isRedoing = false;
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this._updateStatus();
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this.onRedo(this, top);
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if (!(top instanceof dojo.undo.Manager)) {
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this.getTop().onRedoAny(this, top);
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}
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return true;
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}, undoAll:function () {
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while (this._undoStack.length > 0) {
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this.undo();
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}
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}, redoAll:function () {
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while (this._redoStack.length > 0) {
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this.redo();
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}
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}, push:function (undo, redo, description) {
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if (!undo) {
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return;
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}
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if (this._currentManager == this) {
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this._undoStack.push({undo:undo, redo:redo, description:description});
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} else {
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this._currentManager.push.apply(this._currentManager, arguments);
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}
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this._redoStack = [];
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this._updateStatus();
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}, concat:function (manager) {
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if (!manager) {
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return;
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}
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if (this._currentManager == this) {
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for (var x = 0; x < manager._undoStack.length; x++) {
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this._undoStack.push(manager._undoStack[x]);
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}
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if (manager._undoStack.length > 0) {
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this._redoStack = [];
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}
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this._updateStatus();
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} else {
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this._currentManager.concat.apply(this._currentManager, arguments);
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}
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}, beginTransaction:function (description) {
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if (this._currentManager == this) {
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var mgr = new dojo.undo.Manager(this);
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mgr.description = description ? description : "";
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this._undoStack.push(mgr);
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this._currentManager = mgr;
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return mgr;
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} else {
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this._currentManager = this._currentManager.beginTransaction.apply(this._currentManager, arguments);
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}
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}, endTransaction:function (flatten) {
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if (this._currentManager == this) {
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if (this._parent) {
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this._parent._currentManager = this._parent;
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if (this._undoStack.length == 0 || flatten) {
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var idx = dojo.lang.find(this._parent._undoStack, this);
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if (idx >= 0) {
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this._parent._undoStack.splice(idx, 1);
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if (flatten) {
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for (var x = 0; x < this._undoStack.length; x++) {
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this._parent._undoStack.splice(idx++, 0, this._undoStack[x]);
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}
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this._updateStatus();
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}
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}
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}
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return this._parent;
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}
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} else {
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this._currentManager = this._currentManager.endTransaction.apply(this._currentManager, arguments);
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}
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}, endAllTransactions:function () {
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while (this._currentManager != this) {
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this.endTransaction();
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}
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}, getTop:function () {
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if (this._parent) {
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return this._parent.getTop();
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} else {
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return this;
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}
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}});
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