ListView

See the ListViewDemo class.

public void Draw()
{
    // Display non-scrolling list view
    Gui.Heading("NonScroll");
    using (Style.Frame.BeginPadding(new(1, 1, 1, 1)))
    using (Gui.BeginFrame())
    {
        // Uses item drawer and selection handler
        Gui.ListView(
            nonScrollItems,
            new(itemDrawer, selectedItems, n => n.GetHashCode()),
            null);
    }

    // Display scrolling list view
    Gui.Heading("Scroll");
    using (Style.Frame.BeginPadding(new(1, 1, 1, 1)))
    using (Gui.BeginFrame())
        Gui.ScrollingListView(100f, scrollItems, new(itemDrawer, selectedItems, n => n.GetHashCode()));
}

/// <summary>
/// Represents an item in the list.
/// </summary>
class Item
{
    public string Name { get; }
    public bool IsChecked { get; set; }

    public Item(string name)
    {
        Name = name;
    }
}

/// <summary>
/// Handles rendering of individual list items.
/// </summary>
class ItemDrawer : IListItemDrawer<Item>
{
    readonly Gui ui;

    public ItemDrawer(Gui im)
    {
        this.ui = im;
    }

    /// <summary>
    /// Draws a list item with a checkbox and an index label.
    /// </summary>
    public void Draw(int index, Item item, Rect rect)
    {
        using var rects = ui.RectsBuilder
            .Fixed(rect.height)
            .Fit(1).BuildHorizontal(rect);

        var isChecked = item.IsChecked;

        // Draws a checkbox, updating item state if changed
        if (ui.NextRect(rects.R0).CheckBox(ref isChecked))
        {
            item.IsChecked = isChecked;
        }

        ui.NextRect(rects.R1).Text($"{index}");
    }
}