Roo/UndoManager.js

diff --git a/Roo/UndoManager.js b/Roo/UndoManager.js
index e69de29..3e7f840 100644 (file)
--- a/Roo/UndoManager.js
+++ b/Roo/UndoManager.js
@@ -0,0 +1,88 @@
+/**
+ * Originally based of this code... - refactored for Roo...
+ * https://github.com/aaalsaleh/undo-manager
+ 
+ * undo-manager.js
+ * @author  Abdulrahman Alsaleh 
+ * @copyright 2015 Abdulrahman Alsaleh 
+ * @license  MIT License (c) 
+ *
+ * Hackily modifyed by alan@roojs.com
+ *
+ *
+ * usage:
+ * document.undoManager = new UndoManager(limit, document)
+ *  
+ *
+ *  TOTALLY UNTESTED...
+ *
+ *  Documentation to be done....
+ */
+
+function UndoManager(limit, undoScopeHost) {
+               var stack = [];
+               var fireEvent = typeof CustomEvent != 'undefined' && undoScopeHost && undoScopeHost.dispatchEvent;
+
+               this.position = 0;
+               this.length = 0;
+
+               this.transact = function (transaction, merge) {
+                       if (arguments.length < 2)
+                               throw new TypeError('Not enough arguments to UndoManager.transact.');
+
+                       transaction.execute();
+
+                       stack.splice(0, this.position);
+                       if (merge && this.length)
+                               stack[0].push(transaction);
+                       else
+                               stack.unshift([transaction]);
+                       this.position = 0;
+
+                       if (limit && stack.length > limit)
+                               this.length = stack.length = limit;
+                       else
+                               this.length = stack.length;
+
+                       if (fireEvent)
+                               undoScopeHost.dispatchEvent(new CustomEvent('DOMTransaction', {detail: {transactions: stack[0].slice()}, bubbles: true, cancelable: false}));
+               };
+
+               this.undo = function () {
+                       if (this.position < this.length) {
+                               for (var i = stack[this.position].length - 1; i >= 0; i--)
+                                       stack[this.position][i].undo();
+                               this.position++;
+
+                               if (fireEvent)
+                                       undoScopeHost.dispatchEvent(new CustomEvent('undo', {detail: {transactions: stack[this.position - 1].slice()}, bubbles: true, cancelable: false}));
+                       }
+               };
+
+               this.redo = function () {
+                       if (this.position > 0) {
+                               for (var i = 0, n = stack[this.position - 1].length; i < n; i++)
+                                       stack[this.position - 1][i].redo();
+                               this.position--;
+
+                               if (fireEvent)
+                                       undoScopeHost.dispatchEvent(new CustomEvent('redo', {detail: {transactions: stack[this.position].slice()}, bubbles: true, cancelable: false}));
+                       }
+               };
+
+               this.item = function (index) {
+                       if (index >= 0 && index < this.length)
+                               return stack[index].slice();
+                       return null;
+               };
+
+               this.clearUndo = function () {
+                       stack.length = this.length = this.position;
+               };
+
+               this.clearRedo = function () {
+                       stack.splice(0, this.position);
+                       this.position = 0;
+                       this.length = stack.length;
+               };
+       }
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