JSDoc: Source: key_navigatable.js

# Source: key_navigatable.js

    /*************************************************************
     *
     *  Copyright (c) 2015-2016 The MathJax Consortium
     *
     *  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 Interface definition for key navigatable menu elements.
     *
     * @author volker.sorge@gmail.com (Volker Sorge)
     */

    /**
       * Key codes.
       * @enum {number}
       */
    const KEY = {
        RETURN : 13,
        ESCAPE = 27,
        SPACE = 32,
        LEFT = 37,
        UP = 38,
        RIGHT = 39,
        DOWN = 40
    }

    /**
     * @interface
     */
    KeyNavigatable = function() {}

    /**
         * Navigation selection on keyboard events.
         * @param {KeyboardEvent} event The keyboard event that fired.
         */
    KeyNavigatable.prototype.keydown = function() {};

    /**
         * Navigation on escape key pressed.
         * @param {KeyboardEvent} event The keyboard event that fired.
         */
    KeyNavigatable.prototype.escape = function() {};

    /**
         * Navigation on space key pressed.
         * @param {KeyboardEvent} event The keyboard event that fired.
         */
    KeyNavigatable.prototype.space = function() {};

    /**
         * Navigation on left arrow key pressed.
         * @param {KeyboardEvent} event The keyboard event that fired.
         */
    KeyNavigatable.prototype.left = function() {};

    /**
         * Navigation on right arrow key pressed.
         * @param {KeyboardEvent} event The keyboard event that fired.
         */
    KeyNavigatable.prototype.right = function() {};

    /**
         * Navigation on upwards arrow key pressed.
         * @param {KeyboardEvent} event The keyboard event that fired.
         */
    KeyNavigatable.prototype.up = function() {};

    /**
         * Navigation on downwards arrow key pressed.
         * @param {KeyboardEvent} event The keyboard event that fired.
         */
    KeyNavigatable.prototype.down = function() {};