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node_modules/node-blockly/blockly/accessible/keyboard-input.service.js

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+/**
+ * AccessibleBlockly
+ *
+ * Copyright 2016 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed 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.
+ */
+
+/**
+ * @fileoverview Angular2 Service for handling keyboard input.
+ *
+ * @author sll@google.com (Sean Lip)
+ */
+
+goog.provide('blocklyApp.KeyboardInputService');
+
+
+blocklyApp.KeyboardInputService = ng.core.Class({
+  constructor: [function() {
+    // Default custom actions for global keystrokes. The keys of this object
+    // are string representations of the key codes.
+    this.keysToActions = {};
+    // Override for the default keysToActions mapping (e.g. in a modal
+    // context).
+    this.keysToActionsOverride = null;
+
+    // Attach a keydown handler to the entire window.
+    var that = this;
+    document.addEventListener('keydown', function(evt) {
+      var stringifiedKeycode = String(evt.keyCode);
+      var actionsObject = that.keysToActionsOverride || that.keysToActions;
+
+      if (actionsObject.hasOwnProperty(stringifiedKeycode)) {
+        actionsObject[stringifiedKeycode](evt);
+      }
+    });
+  }],
+  setOverride: function(newKeysToActions) {
+    this.keysToActionsOverride = newKeysToActions;
+  },
+  addOverride: function(keyCode, action) {
+    this.keysToActionsOverride[keyCode] = action;
+  },
+  clearOverride: function() {
+    this.keysToActionsOverride = null;
+  }
+});