sharee.bike-App/LastenradBayern/ShareeBike/View/Contact/SelectStationPage.xaml.cs

using System;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace ShareeBike.View.Contact
{
	using Serilog;
	using ShareeBike.Model;
	using ShareeBike.Model.Bikes.BikeInfoNS.DriveNS.BatteryNS;
	using ShareeBike.ViewModel.Contact;

	[XamlCompilation(XamlCompilationOptions.Compile)]
	public partial class SelectStationPage : ContentPage, IViewService
	{
		/// <summary> View model to notify about whether page appears or hides. </summary>
		private SelectStationPageViewModel SelectStationPageViewModel { get; set; }

		public SelectStationPage()
		{
			InitializeComponent();
		}

		/// <summary>
		/// Displays alert message.
		/// </summary>
		/// <param name="title">Title of message.</param>
		/// <param name="message">Message to display.</param>
		/// <param name="cancel">Type of buttons.</param>
		public new async Task DisplayAlert(string title, string message, string cancel)
			=> await App.Current.MainPage.DisplayAlert(title, message, cancel);

		/// <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);

		/// <summary>
		/// Displays alert message.
		/// </summary>
		/// <param name="title">Title of message.</param>
		/// <param name="message">Message to display.</param>
		/// <param name="accept">Text of accept button.</param>
		/// <param name="cancel">Text of button.</param>
		/// <returns>True if user pressed accept.</returns>
		public new async Task<bool> DisplayAlert(string title, string message, string accept, string cancel)
			=> await App.Current.MainPage.DisplayAlert(title, message, accept, cancel);

		/// <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);

		/// <summary> Pushes a page onto the modal stack. </summary>
		/// <param name="typeOfPage">Type of page to display.</param>
		public async Task PushModalAsync(ViewTypes typeOfPage)
			=> await Navigation.PushModalAsync((Page)Activator.CreateInstance(typeOfPage.GetViewType()));

		/// <summary> Pops a page from the modal stack. </summary>
		public async Task PopModalAsync()
			=> await Navigation.PopModalAsync();

		/// <summary> Pushes a page onto the stack. </summary>
		/// <param name="typeOfPage">Page to display.</param>
		public async Task PushAsync(ViewTypes typeOfPage)
		{
			var page = Activator.CreateInstance(typeOfPage.GetViewType());
			if (page == null)
			{
				return;
			}

			await Navigation.PushAsync((Page)page);
		}

#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 page is shown. 
		/// Starts update process.
		/// </summary>
		protected async override void OnAppearing()
		{
			// Pass reference to member Navigation to show bikes at station x dialog.
			try
			{
				Log.ForContext<SelectStationPageViewModel>().Verbose("Constructing select station view model.");

				SelectStationPageViewModel = new SelectStationPageViewModel(
					App.ModelRoot,
					App.PermissionsService,
					App.BluetoothService,
					App.LocationServicesContainer.Active,
					(mapspan) => MyMap.MoveToRegion(mapspan),
					this,
					Navigation);
			}
			catch (Exception exception)
			{

				Log.ForContext<SelectStationPageViewModel>().Error("Constructing select station view model failed. {Exception}", exception);
				return;
			}

			try
			{
				BindingContext = SelectStationPageViewModel;

			}
			catch (Exception exception)
			{
				Log.ForContext<SelectStationPageViewModel>().Error("Setting binding/ navigaton on select station failed. {Exception}", exception);
				return;
			}

			try
			{
				base.OnAppearing();
			}
			catch (Exception exception)
			{
				// Continue because styling is not essential.
				Log.ForContext<SelectStationPageViewModel>().Error("Invoking OnAppearing of base failed. {Exception}", exception);
				return;
			}

			try
			{
				// Pre move and scanle maps to avoid initial display of map in Rome.
				Log.ForContext<SelectStationPageViewModel>().Verbose("Moving and scaling map.");
				SelectStationPageViewModel.MoveAndScale(
					(mapSpan) => MyMap.MoveToRegion(mapSpan),
					App.ModelRoot.Uris.ActiveUri);
			}
			catch (Exception exception)
			{
				// Continue because a map not beeing moved/ scaled is no reason for aborting startup.
				Log.ForContext<SelectStationPageViewModel>().Error("Moving and scaling map failed. {Exception}", exception);
			}

			try
			{
				Log.ForContext<SelectStationPageViewModel>().Verbose("Invoking OnAppearing on select station view model.");
				await SelectStationPageViewModel.OnAppearing();
			}
			catch (Exception exception)
			{
				Log.ForContext<SelectStationPageViewModel>().Error("Invoking OnAppearing on select station view model failed. {Exception}", exception);
				return;
			}
		}
	}
}