UploadPhotoControlViewModel.cs

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using PhotoSharingApp.Portable.DataContracts;
using PhotoSharingApp.Portable.Extensions;
using PhotoSharingApp.Universal.Commands;
using PhotoSharingApp.Universal.Facades;
using PhotoSharingApp.Universal.Storage;
using PhotoSharingApp.Universal.Views;
using Windows.ApplicationModel.Resources;

namespace PhotoSharingApp.Universal.ViewModels
{
    /// <summary>
    /// The ViewModel for the upload photo control.
    /// </summary>
    public class UploadPhotoControlViewModel : ViewModelBase
    {
        private readonly IDialogService _dialogService;
        private readonly INavigationFacade _navigationFacade;

        /// <summary>
        /// Creates a new instance.
        /// </summary>
        /// <param name="navigationFacade">The navigation facade.</param>
        /// <param name="dialogService">The dialog service.</param>
        public UploadPhotoControlViewModel(INavigationFacade navigationFacade, IDialogService dialogService)
        {
            _navigationFacade = navigationFacade;
            _dialogService = dialogService;

            // Initialize commands
            TakePhotoCommand = new RelayCommand(OnTakePhoto);
            BrowsePicturesLibraryCommand = new RelayCommand(OnBrowsePictures);
        }

        /// <summary>
        /// Gets the command for browsing the pictures library.
        /// </summary>
        public RelayCommand BrowsePicturesLibraryCommand { get; }

        /// <summary>
        /// Gets the take photo command.
        /// </summary>
        public RelayCommand TakePhotoCommand { get; }

        private async void OnBrowsePictures()
        {
            try
            {
                var file = await FilePickerHelper.PickSingleFile();
                if (file != null)
                {
                    _navigationFacade.NavigateToCropView(file);
                }
            }
            catch (InvalidImageDimensionsException)
            {
                var resourceLoader = ResourceLoader.GetForCurrentView();
                var message = string.Format(resourceLoader.GetString("InvalidImageSize_Message"),
                    PhotoTypeContract.Standard.ToSideLength());
                var title = resourceLoader.GetString("InvalidImageSize_Title");

                await _dialogService.ShowNotification(message, title, false);
            }
        }

        private void OnTakePhoto()
        {
            _navigationFacade.NavigateToCameraView();
        }
    }
}