sharee.bike-App/Meinkonrad/TINK/View/BikesAtStation/BikesAtStationPage.xaml.cs

using TINK.Model.Bikes.BikeInfoNS.BluetoothLock;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace TINK.View.BikesAtStation
{
	using System;
	using System.Linq;
	using System.Threading;
	using System.Threading.Tasks;
	using TINK.Model.Device;
#if USEFLYOUT
    using TINK.View.MasterDetail;
#endif
	using TINK.ViewModel;
	using TINK.Model;
	using TINK.Services.BluetoothLock.Tdo;
	using System.Collections.Generic;
	using Serilog;
	using TINK.Services.BluetoothLock;
	using Plugin.BLE;
	using TINK.ViewModel.BikesAtStation;
	using TINK.ViewModel.Bikes;
	using Xamarin.CommunityToolkit.Extensions;
	using TINK.Model.Bikes.BikeInfoNS.DriveNS.BatteryNS;

	[XamlCompilation(XamlCompilationOptions.Compile)]
#if USEFLYOUT
    public partial class BikesAtStationPage : ContentPage, IViewService, IDetailPage
#else
	public partial class BikesAtStationPage : ContentPage, IViewService
#endif
	{

		private BikesAtStationPageViewModel m_oViewModel;

		/// <summary> Initialization status to ensure initialization logic is not called multiple times. </summary>
		private bool isInitializationStarted = false;

#if TRYNOTBACKSTYLE
        public BikesAtStationPage()
        {
            InitializeComponent();

            var l_oModel = App.ModelRoot;

            var l_oViewModel = new BikesAtStationPageViewModel(
                l_oModel.BikesAtStation,
                l_oModel.ActiveUser,
                l_oModel.SelectedStation,
                this);

            BindingContext = l_oViewModel;
            BikesAtStationListView.ItemsSource = l_oViewModel;
        }

#else
		public BikesAtStationPage()
		{
		}
#endif

		/// <summary>
		/// Invoked when page is shown. 
		/// Starts update process.
		/// </summary>
		protected async override void OnAppearing()
		{
			// Don't repeat the initialization if it has been completed already.
			if (isInitializationStarted) return;
			isInitializationStarted = true;

			if (m_oViewModel != null)
			{
#if BACKSTYLE
                // Hide master- detail menu to force user to navigate using back button.
                m_oNavigation.IsGestureEnabled = false;
#endif

				// No need to create view model, set binding context an items source if already done.
				// If done twice tap events are fired multiple times (when hiding page using home button).
				await m_oViewModel.OnAppearing();
				isInitializationStarted = false;
				return;
			}

			try
			{
				var model = App.ModelRoot;

				// Backup synchronization context when called from GUI-thread.
				var synchronizationContext = SynchronizationContext.Current;

				m_oViewModel = new BikesAtStationPageViewModel(
						model.ActiveUser,
						App.PermissionsService,
						App.BluetoothService,
						Device.RuntimePlatform,
						model.SelectedStation,
						() => model.GetIsConnected(),
						(isConnected) => model.GetConnector(isConnected),
						App.LocationServicesContainer.Active,
						model.LocksServices.Active,
						model.Polling,
						(url) => DependencyService.Get<IExternalBrowserService>().OpenUrl(url),
						(d, obj) => synchronizationContext.Post(d, obj),
						model.SmartDevice,
						this)
				{
					IsReportLevelVerbose = model.IsReportLevelVerbose
				};
			}
			catch (Exception exception)
			{
				Log.ForContext<BikesAtStationPage>().Error("Displaying bikes at station page failed. {Exception}", exception);
				await DisplayAlert("Fehler", $"Seite Räder an Station kann nicht angezeigt werden. ${exception.Message}", "OK");
				isInitializationStarted = false;
				return;
			}

			InitializeComponent();

#if BACKSTYLE
            // Hide master- detail menu to force user to navigate using back button.
            m_oNavigation.IsGestureEnabled = false;
#endif

			BindingContext = m_oViewModel;
			BikesAtStationListView.ItemsSource = m_oViewModel;

			await m_oViewModel.OnAppearing();
			isInitializationStarted = false;
		}

		/// <summary>
		/// Invoked when pages is closed/ hidden. 
		/// Stops update process.
		/// </summary>
		protected async override void OnDisappearing()
		{
			if (m_oViewModel != null)
			{
				// View model might be null.
				await m_oViewModel?.OnDisappearing();
			}

#if BACKSTYLE
            if (m_oNavigation!= null)
                m_oNavigation.IsGestureEnabled = true; // Enables master- detail menu navigation again when page is unloaded.
#endif
		}

		/// <summary>
		/// Handeles pressing of the Android hardware back button.
		/// </summary>
		/// <returns></returns>
		protected override bool OnBackButtonPressed() => !m_oViewModel.IsIdle;

		/// <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 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> 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);


#if USEFLYOUT
        /// <summary> Creates and a page an shows it.</summary>
        /// <remarks> When user is not logged in navigation to Login page is supported.</remarks>
        /// <param name="p_oTypeOfPage">Type of page to show.</param>
        public void ShowPage(ViewTypes p_oType, string title = null)
            => m_oNavigation.ShowPage(p_oType.GetViewType(), title);
#else
		/// <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);
#endif


		/// <summary> Pushes a page onto the modal stack. </summary>
		/// <param name="typeOfPage">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 Task PopModalAsync()
		{
			throw new NotSupportedException();
		}

		public Task PushAsync(ViewTypes p_oTypeOfPage)
		{
			throw new NotImplementedException();
		}

#if USEFLYOUT
        /// <summary>
        /// Delegate to perform navigation.
        /// </summary>
        private INavigationMasterDetail m_oNavigation;

        /// <summary>
        /// Delegate to perform navigation.
        /// </summary>
        public INavigationMasterDetail NavigationMasterDetail
        {
            set { m_oNavigation = value; }
        }

#endif

#if USCSHARP9
        public async Task<IViewService.IUserFeedback> DisplayUserFeedbackPopup() => await Navigation.ShowPopupAsync<FeedbackPopup.Result>(new FeedbackPopup());
#else
		/// <summary> Displays user feedback popup.</summary>
		/// <param name="co2Saving"> Co2 saving information.</param>
		/// <returns>User feedback.</returns>
		public async Task<IUserFeedback> DisplayUserFeedbackPopup(IBattery battery = null, string co2Saving = null) => await Navigation.ShowPopupAsync<FeedbackPopup.Result>(new FeedbackPopup(battery, co2Saving));
#endif
	}
}