DefaultUploadFinishedHandler.cs

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using System.Threading.Tasks;
using PhotoSharingApp.Universal.Facades;
using PhotoSharingApp.Universal.Models;

namespace PhotoSharingApp.Universal.ViewModels
{
    /// <summary>
    /// The default handler that is being activated when a photo upload
    /// has been finished successfully.
    /// </summary>
    public class DefaultUploadFinishedHandler : IUploadFinishedHandler
    {
        private readonly INavigationFacade _navigationFacade;

        /// <summary>
        /// The constructor
        /// </summary>
        /// <param name="navigationFacade">The navigation facade.</param>
        public DefaultUploadFinishedHandler(INavigationFacade navigationFacade)
        {
            _navigationFacade = navigationFacade;
        }

        /// <summary>
        /// Called when a photo has been uploaded successfully.
        /// </summary>
        /// <param name="category">The associated category.</param>
        public Task OnUploadFinished(Category category)
        {
            _navigationFacade.NavigateToPhotoStream(category);

            // Remove the frames related to uploading the photo for back button navigation
            _navigationFacade.RemoveUploadPhotoFramesFromBackStack(category.Id);

            return Task.CompletedTask;
        }
    }
}