using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.MachineStudio.Common.Navigation
{
    /// <summary>
    /// Represents an object which can abort the navigation from it.
    /// </summary>
    public interface INavigationBlocker
    {
        /// <summary>
        /// Called before the navigation system navigates from this object.
        /// Return false to abort the navigation.
        /// </summary>
        /// <returns></returns>
        Task<bool> OnNavigateOutRequest();

        /// <summary>
        /// Called before the navigation system navigates back from this object.
        /// Return false to abort the navigation.
        /// </summary>
        /// <returns></returns>
        Task<bool> OnNavigateBackRequest();
    }
}