Fix add links.

mindplot/src/main/javascript/commands/ChangeLinkToTopicCommand.js

@@ -0,0 +1,48 @@
+/*
+ *    Copyright [2011] [wisemapping]
+ *
+ *   Licensed under WiseMapping Public License, Version 1.0 (the "License").
+ *   It is basically the Apache License, Version 2.0 (the "License") plus the
+ *   "powered by wisemapping" text requirement on every single page;
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the license at
+ *
+ *       http://www.wisemapping.org/license
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ */
+
+mindplot.commands.ChangeLinkToTopicCommand = new Class({
+    Extends:mindplot.Command,
+    initialize: function(topicId, url) {
+        $assert(topicId, 'topicId can not be null');
+        this._objectsIds = topicId;
+        this._url = url;
+        this._id = mindplot.Command._nextUUID();
+    },
+
+    execute: function(commandContext) {
+        var topic = commandContext.findTopics(this._objectsIds)[0];
+        if (topic.hasLink()) {
+            var model = topic.getModel();
+            var link = model.getLinks()[0];
+            this._oldUrl = link.getUrl();
+            topic.removeLink();
+        }
+        topic.addLink(this._url);
+    },
+
+    undoExecute: function(commandContext) {
+        var topic = commandContext.findTopics(this._objectsIds)[0];
+        if (this._oldtext) {
+            topic.removeLink();
+            topic.addLink(this._oldUrl);
+        } else {
+            topic.removeLink();
+        }
+    }
+});