Avalonia/Perspex.Input/Navigation/FocusExtensions.cs

// -----------------------------------------------------------------------
// <copyright file="FocusExtensions.cs" company="Steven Kirk">
// Copyright 2015 MIT Licence. See licence.md for more information.
// </copyright>
// -----------------------------------------------------------------------

namespace Perspex.Input.Navigation
{
    /// <summary>
    /// Provides extension methods relating to control focus.
    /// </summary>
    internal static class FocusExtensions
    {
        /// <summary>
        /// Checks if the specified element can be focused.
        /// </summary>
        /// <param name="e">The element.</param>
        /// <returns>True if the element can be focused.</returns>
        public static bool CanFocus(this IInputElement e) => e.Focusable && e.IsEnabledCore && e.IsVisible;

        /// <summary>
        /// Checks if descendents of the specified element can be focused.
        /// </summary>
        /// <param name="e">The element.</param>
        /// <returns>True if descendents of the element can be focused.</returns>
        public static bool CanFocusDescendents(this IInputElement e) => e.IsEnabledCore && e.IsVisible;
    }
}