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

namespace Perspex.Interactivity
{
    using System.Collections.Generic;
    using System.Linq;

    /// <summary>
    /// Provides extension methods for the <see cref="IInteractive"/> interface.
    /// </summary>
    public static class InteractiveExtensions
    {
        /// <summary>
        /// Gets the route for bubbling events from the specified interactive.
        /// </summary>
        /// <param name="interactive">The interactive.</param>
        /// <returns>The event route.</returns>
        public static IEnumerable<IInteractive> GetBubbleEventRoute(this IInteractive interactive)
        {
            while (interactive != null)
            {
                yield return interactive;
                interactive = interactive.InteractiveParent;
            }
        }

        /// <summary>
        /// Gets the route for tunneling events from the specified interactive.
        /// </summary>
        /// <param name="interactive">The interactive.</param>
        /// <returns>The event route.</returns>
        public static IEnumerable<IInteractive> GetTunnelEventRoute(this IInteractive interactive)
        {
            return interactive.GetBubbleEventRoute().Reverse();
        }
    }
}