GUACAMOLE-152: Allow zoom/scale to be manually entered.

guacamole/src/main/webapp/app/client/directives/guacZoomCtrl.js

@@ -0,0 +1,42 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+
+/**
+ * A directive which converts between human-readable zoom
+ * percentage and display scale.
+ */
+angular.module('client').directive('guacZoomCtrl', function guacZoomCtrl() {
+    return {
+        restrict: 'A',
+        require: 'ngModel',
+        priority: 101,
+        link: function(scope, element, attr, ngModel) {
+
+            // When pushing to the menu, mutiply by 100.
+            ngModel.$formatters.push(function(value) {
+                return Math.round(value * 100);
+            });
+           
+            // When parsing value from menu, divide by 100.
+            ngModel.$parsers.push(function(value) {
+                return Math.round(value) / 100;
+            });
+        }
+    }
+});