CategoriesChooserDialog.xaml.cs

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using Microsoft.Practices.ServiceLocation;
using PhotoSharingApp.Universal.Models;
using PhotoSharingApp.Universal.ViewModels;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace PhotoSharingApp.Universal.Views
{
    /// <summary>
    /// The dialog that allows the user to choose a category.
    /// </summary>
    public sealed partial class CategoriesChooserDialog : ContentDialog
    {
        public CategoriesChooserDialog()
        {
            InitializeComponent();
            ViewModel = ServiceLocator.Current.GetInstance<CategoriesChooserViewModel>();
            DataContext = ViewModel;

            // Register for events
            Loaded += CategoriesChooserDialog_Loaded;
        }

        public CategoriesChooserViewModel ViewModel { get; }

        private void CancelButtonClick(ContentDialog sender, ContentDialogButtonClickEventArgs args)
        {
            ViewModel.SelectedCategory = null;
        }

        private async void CategoriesChooserDialog_Loaded(object sender, RoutedEventArgs e)
        {
            await ViewModel.LoadState();

            if (AppEnvironment.Instance.IsDesktopDeviceFamily)
            {
                // On desktop we set the focus instantly to
                // the search box so that the user is able
                // type search text right away.
                // On mobile, this would expand the virtual keyboard
                // and takes away too much space by default.
                searchTextBox.Focus(FocusState.Keyboard);
            }
        }
    }
}