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Key navigation

To be used for mapping keyboard arrow press events

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/396703/1100259/Key%20navigation.js 

(() => {
  'use strict';

  const setUpKeyNavigation = ({
    onDownPressed,
    onLeftPressed,
    onRightPressed,
    onUpPressed,
    preventDefault,
    stopPropagation,
  }) => {
    document.addEventListener('keydown', (event) => {
      const operation = {
        ArrowDown: (e) => executeFn(onDownPressed, e),
        ArrowLeft: (e) => executeFn(onLeftPressed, e),
        ArrowRight: (e) => executeFn(onRightPressed, e),
        ArrowUp: (e) => executeFn(onUpPressed, e),
      }[event.key];

      if (operation) operation(event);

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

  const setUpAnchorNavigation = (selectorsMap) => {
    const downHref = getAnchorHref(selectorsMap.down);
    const leftHref = getAnchorHref(selectorsMap.left);
    const rightHref = getAnchorHref(selectorsMap.right);
    const upHref = getAnchorHref(selectorsMap.up);

    setUpKeyNavigation({
      onDownPressed: generateNavigationEvent(downHref),
      onLeftPressed: generateNavigationEvent(leftHref),
      onRightPressed: generateNavigationEvent(rightHref),
      onUpPressed: generateNavigationEvent(upHref),
    });
  };

  const getElement = (selector) => {
    return selector ? document.querySelector(selector) : undefined;
  };

  const getAnchorHref = (selector) => {
    return getElement(selector)?.href;
  };

  const generateNavigationEvent = (href) => {
    return href ? () => (location.href = href) : undefined;
  };

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

  window.setUpAnchorNavigation = setUpAnchorNavigation;
  window.setUpKeyNavigation = setUpKeyNavigation;
})();