spectre.console/src/Spectre.Console/Extensions/ExpandableExtensions.cs

namespace Spectre.Console;

/// <summary>
/// Contains extension methods for <see cref="IExpandable"/>.
/// </summary>
public static class ExpandableExtensions
{
    /// <summary>
    /// Tells the specified object to not expand to the available area
    /// but take as little space as possible.
    /// </summary>
    /// <typeparam name="T">The expandable object.</typeparam>
    /// <param name="obj">The object to collapse.</param>
    /// <returns>The same instance so that multiple calls can be chained.</returns>
    public static T Collapse<T>(this T obj)
        where T : class, IExpandable
    {
        if (obj is null)
        {
            throw new ArgumentNullException(nameof(obj));
        }

        obj.Expand = false;
        return obj;
    }

    /// <summary>
    /// Tells the specified object to expand to the available area.
    /// </summary>
    /// <typeparam name="T">The expandable object.</typeparam>
    /// <param name="obj">The object to expand.</param>
    /// <returns>The same instance so that multiple calls can be chained.</returns>
    public static T Expand<T>(this T obj)
        where T : class, IExpandable
    {
        if (obj is null)
        {
            throw new ArgumentNullException(nameof(obj));
        }

        obj.Expand = true;
        return obj;
    }
}