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

using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using TINK.Model.Bike.BluetoothLock;

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;

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

        private BikesAtStationPageViewModel m_oViewModel;
#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()
        {
            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();
                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.GeolocationServicesContainer.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");
                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();
        }

        /// <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> 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, $"{message}\r\nDetails:\r\n{details}", 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(string co2Saving = null) => await Navigation.ShowPopupAsync<FeedbackPopup.Result>(new FeedbackPopup(co2Saving));
#endif
        }
    }