open class CodeCell: UITableViewCell {

    class CodeScrollView: UIScrollView, UIGestureRecognizerDelegate {

        func gestureRecognizer(

            _ gestureRecognizer: UIGestureRecognizer,

            shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer

        ) -> Bool {

            return true

        }

    }



    let scrollView = CodeScrollView()

    private let textView: UITextView

    private let textViewLayoutManager: CodeLayoutManager

    private let container = NSTextContainer(size: .zero)



    public var textViewBackgroundColor: UIColor? {

        get { textView.backgroundColor }

        set { textView.backgroundColor = newValue }

    }



    private var textContainerInset: UIEdgeInsets {

        get { textView.textContainerInset}

        set {

            textView.textContainerInset = newValue

            textViewLayoutManager.textContainerInset = newValue

        }

    }



    override public init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {

        textViewLayoutManager = CodeLayoutManager()

        textViewLayoutManager.addTextContainer(container)

        let storage = NSTextStorage()

        storage.addLayoutManager(textViewLayoutManager)

        textView = UITextView(frame: .zero, textContainer: container)



        super.init(style: style, reuseIdentifier: reuseIdentifier)

        selectionStyle = .none



        setUpViews()

    }



    required public init?(coder aDecoder: NSCoder) {

        fatalError("init(coder:) has not been implemented")

    }



    private func setUpViews() {

        textView.textContainer.lineFragmentPadding = 0

        textView.isEditable = false

        textView.translatesAutoresizingMaskIntoConstraints = false

        textView.isScrollEnabled = false

        textView.scrollsToTop = false

        textView.backgroundColor = .clear



        contentView.addSubview(scrollView)

        scrollView.addSubview(textView)



        scrollView.translatesAutoresizingMaskIntoConstraints = false

        textView.translatesAutoresizingMaskIntoConstraints = false



        NSLayoutConstraint.activate([

          textView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor),

          textView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor),

          textView.topAnchor.constraint(equalTo: scrollView.topAnchor),

          textView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),



          scrollView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),

          scrollView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),

          scrollView.topAnchor.constraint(equalTo: contentView.topAnchor),

          scrollView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),

          scrollView.heightAnchor.constraint(equalTo: textView.heightAnchor)

        ])

    }
}