text: /**
   * 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;
    }
  });
  