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Key navigation

To be used for mapping keyboard arrow press events

Verzia zo dňa 21.02.2020. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greatest.deepsurf.us/scripts/396703/774316/Key%20navigation.js 

(() => {
  'use strict';

  const KEYS = {
    37: 'LEFT',
    38: 'UP',
    39: 'RIGHT',
    40: 'DOWN',
  };

  const setUpKeyNavigation = ({
    onDownPressed,
    onLeftPressed,
    onRightPressed,
    onUpPressed,
    preventDefault,
    stopPropagation,
  }) => {
    document.addEventListener('keydown', event => {
      const eventKey = KEYS[event.which];

      const operation = {
        DOWN: e => executeFn(onDownPressed, e),
        LEFT: e => executeFn(onLeftPressed, e),
        RIGHT: e => executeFn(onRightPressed, e),
        UP: e => executeFn(onUpPressed, e),
      }[eventKey];
      operation && operation(event);

      preventDefault && event.preventDefault();
      stopPropagation && event.stopPropagation();
    });
  };

  const executeFn = (fn, ...parameters) => {
    return typeof fn === 'function' && fn(...parameters);
  };

  window.setUpKeyNavigation = setUpKeyNavigation;
})();