GUACAMOLE-55: Add image support to the guacClipboard directive.

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

@@ -51,7 +51,7 @@ angular.module('client').directive('guacClipboard', [function guacClipboard() {
          * field. Changes to this value will be rendered within the field and,
          * if possible, will be pushed to the local clipboard.
          *
-         * @type String
+         * @type String|Blob
          */
         data : '='
 
@@ -85,6 +85,74 @@ angular.module('client').directive('guacClipboard', [function guacClipboard() {
          */
         var clipboardDataFromKey = {};
 
+        /**
+         * The URL of the image is currently stored within the clipboard. If
+         * the clipboard currently contains text, this will be null.
+         *
+         * @type String
+         */
+        $scope.imageURL = null;
+
+        // Intercept paste events, handling image data specifically
+        $element[0].addEventListener('paste', function dataPasted(e) {
+
+            // For each item within the clipboard
+            var items = e.clipboardData.items;
+            for (var i = 0; i < items.length; i++) {
+
+                // If the item is an image, attempt to read that image
+                if (items[i].kind === 'file' && /^image\//.exec(items[i].type)) {
+
+                    // Set clipboard data to contents
+                    $scope.$apply(function setClipboardData() {
+                        $scope.data = items[i].getAsFile();
+                    });
+
+                    // Do not paste
+                    e.preventDefault();
+                    return;
+
+                }
+
+            } // end for each item
+
+        });
+
+        /**
+         * Returns whether the clipboard currently contains only an image, the
+         * URL of which is exposed via the imageURL property.
+         *
+         * @returns {Boolean}
+         *     true if the current clipboard contains only an image, false
+         *     otherwise.
+         */
+        $scope.isImage = function isImage() {
+            return !!$scope.imageURL;
+        };
+
+        /**
+         * Returns whether the clipboard currently contains only text.
+         *
+         * @returns {Boolean}
+         *     true if the clipboard currently contains only text, false
+         *     otherwise.
+         */
+        $scope.isText = function isText() {
+            return !$scope.isImage();
+        };
+
+        /**
+         * Clears the current clipboard contents. If the clipboard currently
+         * displays an image, this will also return to a text-based clipboard
+         * display.
+         */
+        $scope.resetClipboard = function resetClipboard() {
+
+            // Reset to blank
+            $scope.data = '';
+
+        };
+
         // Watch clipboard for new data, associating it with any pressed keys
         $scope.$watch('data', function clipboardChanged(data) {
 
@@ -92,7 +160,20 @@ angular.module('client').directive('guacClipboard', [function guacClipboard() {
             for (var keysym in keysCurrentlyPressed)
                 clipboardDataFromKey[keysym] = data;
 
-            // Notify of updated clipboard data
+            // Revoke old image URL, if any
+            if ($scope.imageURL) {
+                URL.revokeObjectURL($scope.imageURL);
+                $scope.imageURL = null;
+            }
+
+            // If the copied data was an image, display it as such
+            if (data instanceof Blob) {
+                $scope.imageURL = URL.createObjectURL(data);
+                $rootScope.$broadcast('guacClipboard', data.type, data);
+            }
+
+            // Otherwise, the data is simply text
+            else
                 $rootScope.$broadcast('guacClipboard', 'text/plain', data);
 
         });

guacamole/src/main/webapp/app/client/styles/clipboard.css

@@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+
+.clipboard .image-clipboard,
+.clipboard .text-clipboard textarea {
+    position: relative;
+    border: 1px solid #AAA;
+    -moz-border-radius: 0.25em;
+    -webkit-border-radius: 0.25em;
+    -khtml-border-radius: 0.25em;
+    border-radius: 0.25em;
+    background: white;
+}
+
+.clipboard .text-clipboard textarea {
+    width: 100%;
+    white-space: pre;
+}
+
+.clipboard .image-clipboard {
+    text-align: center;
+}
+
+.clipboard .image-clipboard .reset-button {
+    position: absolute;
+    left: 0;
+    top: 0;
+    font-size: 0.75em;
+    min-width: 0;
+}
+
+.clipboard .image-clipboard img {
+    max-width: 100%;
+    max-height: 480px;
+}

guacamole/src/main/webapp/app/client/styles/guac-menu.css

@@ -66,14 +66,6 @@
 }
 
 #guac-menu #clipboard-settings textarea {
-    width: 100%;
-    border: 1px solid #AAA;
-    -moz-border-radius: 0.25em;
-    -webkit-border-radius: 0.25em;
-    -khtml-border-radius: 0.25em;
-    border-radius: 0.25em;
-    white-space: pre;
-    display: block;
     font-size: 1em;
 }
 

guacamole/src/main/webapp/app/client/templates/guacClipboard.html

@@ -1 +1,9 @@
-<textarea ng-model="data" rows="10" cols="40" class="clipboard"></textarea>
+<div class="clipboard">
+    <div ng-if="isText()" class="text-clipboard">
+        <textarea ng-model="data" rows="10" cols="40"></textarea>
+    </div>
+    <div ng-if="isImage()" class="image-clipboard">
+        <button ng-click="resetClipboard()" class="reset-button">Clear</button>
+        <img ng-src="{{imageURL}}">
+    </div>
+</div>