Menu.cs

using Meadow;
using Meadow.Foundation.Graphics;
using Meadow.Foundation.Graphics.MicroLayout;

namespace MicroLayoutMenu;

public class Menu
{
    private Label[] _labels;
    private Box _highlightBox;

    private const int ItemHeight = 30;

    public int SelectedRow { get; set; } = 0;

    public readonly Color UnselectedTextColor = Color.AntiqueWhite;
    public readonly Color SelectedTextColor = Color.Black;
    public readonly Color SelectionColor = Color.Orange;
    public readonly IFont MenuFont = new Font12x20();

    public Menu(string[] items, DisplayScreen screen)
    {
        _labels = new Label[items.Length];

        var x = 2;
        var y = 0;
        var height = ItemHeight;

        // we compose the screen from the back forward, so put the box on first
        _highlightBox = new Box(0, -1, screen.Width, ItemHeight + 2)
        {
            ForegroundColor = SelectionColor,
            IsFilled = true,
        };

        screen.Controls.Add(_highlightBox);

        for (var i = 0; i < items.Length; i++)
        {
            _labels[i] = new Label(
                left: x,
                top: i * height,
                width: screen.Width,
                height: height)
            {
                Text = items[i],
                Font = MenuFont,
                BackgroundColor = Color.Transparent,
                VerticalAlignment = VerticalAlignment.Center,
            };

            // select the first item
            if (i == 0)
            {
                _labels[i].TextColor = SelectedTextColor;
            }
            else
            {
                _labels[i].TextColor = UnselectedTextColor;
            }

            screen.Controls.Add(_labels[i]);


            y += height;
        }
    }

    public void Down()
    {
        if (SelectedRow < _labels.Length - 1)
        {
            SelectedRow++;

            Resolver.Log.Info($"MENU SELECTED: {_labels[SelectedRow].Text}");

            Draw(SelectedRow - 1, SelectedRow);
        }
    }

    public void Up()
    {
        if (SelectedRow > 0)
        {
            SelectedRow--;

            Resolver.Log.Info($"MENU SELECTED: {_labels[SelectedRow].Text}");

            Draw(SelectedRow + 1, SelectedRow);
        }
    }

    public void Draw(int oldRow, int newRow)
    {
        _labels[oldRow].TextColor = UnselectedTextColor;
        _labels[newRow].TextColor = SelectedTextColor;

        _highlightBox.Top = _labels[newRow].Top - 1;
    }
}