sharee.bike-App/LastenradBayern/ShareeBike/View/WhatsNew/WhatsNewPage.xaml.cs

using System;
using System.Threading.Tasks;
using ShareeBike.Model.Bikes.BikeInfoNS.DriveNS.BatteryNS;
using ShareeBike.Model.Device;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace ShareeBike.View.WhatsNew
{
	[XamlCompilation(XamlCompilationOptions.Compile)]
	public partial class WhatsNewPage : ContentPage, IViewService
	{
		/// <summary> Holds a reference on the view model. </summary>
		private ViewModel.WhatsNew.WhatsNewViewModel WhatsNewViewModel;

		/// <summary> Constructs whats new page.</summary>
		/// <param name="showMasterDetail">Action to invoke master detail page.</param>
		public WhatsNewPage(Action showMasterDetail)
		{
			InitializeComponent();

			WhatsNewViewModel = new ViewModel.WhatsNew.WhatsNewViewModel(
				DependencyService.Get<IAppInfo>().Version,
				App.ModelRoot.WhatsNew.WhatsNewText,
				App.ModelRoot.WhatsNew.IsShowAgbRequired,
				showMasterDetail,
				this);

			BindingContext = WhatsNewViewModel;
		}

		/// <summary> Displays alert message.</summary>
		/// <param name="title">Title of message.</param>
		/// <param name="message">Message to display.</param>
		/// <param name="details">Detailed error description.</param>
		/// <param name="cancel">Type of buttons.</param>
		public async Task DisplayAdvancedAlert(
			string title,
			string message,
			string details,
			string cancel)
			=> await App.Current.MainPage.DisplayAlert(title, $"{message}\r\nDetails:\r\n{details}", cancel);

		/// <summary> Displays detailed alert message.</summary>
		/// <param name="title">Title of message.</param>
		/// <param name="message">Message to display.</param>
		/// <param name="details">Detailed error description.</param>
		/// <param name="accept">Text of accept button.</param>
		/// <param name="cancel">Text of cancel button.</param>
		/// <returns>True if user pressed accept.</returns>
		public async Task<bool> DisplayAdvancedAlert(string title, string message, string details, string accept, string cancel)
			=> await App.Current.MainPage.DisplayAlert(title, !string.IsNullOrEmpty(details) ? $"{message}\r\nDetails:\r\n{details}" : $"{message}", accept, cancel);

		public Task PopModalAsync()
		{
			throw new NotImplementedException(); ;
		}

		/// <summary> Pushes a page onto the stack. </summary>
		/// <param name="p_oTypeOfPage">Page to display.</param>
		public Task PushAsync(ViewTypes p_oTypeOfPage)
		{
			throw new NotImplementedException();
		}

		public async Task PushModalAsync(ViewTypes p_oTypeOfPage)
		{
			await Navigation.PushModalAsync((Page)Activator.CreateInstance(p_oTypeOfPage.GetViewType()));
		}

		/// <summary> Shows a page.</summary>
		/// <param name="route">Route of the page to show.</param>
		public async Task ShowPage(string route) => await Shell.Current.GoToAsync(route);

#if USCSHARP9
        public Task<IViewService.IUserFeedback> DisplayUserFeedbackPopup() => throw new NotSupportedException();
#else
		public async Task<IUserFeedback> DisplayUserFeedbackPopup(IBatteryMutable battery = null) => throw new NotSupportedException();
#endif

		/// <summary>
		/// Invoked when pages is closed/ hidden.
		/// /// </summary>
		protected override void OnDisappearing()
		{
			base.OnDisappearing();

			if (WhatsNewViewModel == null)
			{
				// View model might be null.
				return;
			}

			WhatsNewViewModel?.OnDisappearing(() =>
			{
				App.ModelRoot.WhatsNew.WasShownInCurrentSession = true;
				App.ModelRoot.Save();
			});
		}
	}
}