'use strict';

/* --------------------------------------------------------------
 shortcuts.js 2016-09-13
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2016 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

jse.libs.shortcuts = jse.libs.shortcuts || {};

/**
 * ## Shortcuts library.
 *
 * This module holds the registered shortcuts and provides predefined constants for event key codes.
 * Additionally, you are allowed to register a custom shortcut by using the `registerShortcut()` function.
 *
 * Example on how to register a custom shortcut:
 *  jse.libs.shortcuts.registerShortcut('myShortcut', [17, 16, 70], _doThis);
 *
 * @module Admin/Libs/shortcuts
 * @exports jse.libs.shortcuts
 */
(function (exports) {
    // Event key codes map.
    exports.KEY_CODES = {
        // Left control key.
        CTRL_L: 17,

        // Left shift key.
        SHIFT_L: 16,

        // Above number key 1.
        NUM_1: 49,
        NUM_2: 50,
        NUM_3: 51,
        NUM_4: 52,
        NUM_5: 53,
        NUM_6: 54,
        NUM_7: 55,
        NUM_8: 56,
        NUM_9: 57
    };

    // List of registered shortcuts.
    // Structure:
    // [
    //      {
    //          name: 'openSearch',
    //          combination: [17, 16, 70],
    //          callback: () => 'Hello world!'
    //      }
    // ]
    exports.registeredShortcuts = [];

    /**
     * Registers a shortcut by adding the key combination and the respective callback function to the register object.
     *
     * @param {String} name Name of the key combination.
     * @param {Number[]} combination Array of event key numbers that represent a key combination.
     * @param {Function} callback Function to be invoked on key combination match.
     */
    exports.registerShortcut = function (name, combination, callback) {
        // Check combination name.
        if (!name || typeof name !== 'string') {
            throw new Error('Key combination name parameter is missing or invalid');
        }

        // Check combination.
        if (!combination || !Array.isArray(combination)) {
            throw new Error('Key combination parameter is missing or invalid');
        }

        // Check callback function.
        if (!callback || typeof callback !== 'function') {
            throw new Error('Callback function parameter is missing or invalid');
        }

        // Register shortcut.
        exports.registeredShortcuts.push({ name: name, combination: combination, callback: callback });
    };
})(jse.libs.shortcuts);
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