Function handleKeydown

ts/codediff/codediff.tsx:235–242

(e: KeyboardEvent)

  React.useEffect(() => {
    const handleKeydown = (e: KeyboardEvent) => {
      if (!isLegitKeypress(e)) return;
      if (e.code !== 'KeyN' && e.code !== 'KeyP') return;
      const newSelectedLine = moveUpDown(e.code === 'KeyN' ? 'up' : 'down', selectedLine, ops);
      if (newSelectedLine !== undefined) {
        setSelectedLine(newSelectedLine);
      }
    };
    document.addEventListener('keydown', handleKeydown);
    return () => {
      document.removeEventListener('keydown', handleKeydown);