sharee.bike-App/TINK/TINK/View/MyBikes/MyBikesPage.xaml.cs

using Plugin.Connectivity;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using TINK.Model.Bike.BluetoothLock;
using TINK.View.MasterDetail;
using TINK.ViewModel;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace TINK.View.MyBikes
{
    using Plugin.Permissions.Abstractions;
    using Plugin.Permissions;
    using TINK.Model;
    using TINK.Services.BluetoothLock.Tdo;
    using System.Collections.Generic;
    using Serilog;
    using Plugin.BLE;
    using TINK.Services.BluetoothLock;
    using TINK.ViewModel.MyBikes;
    using Xamarin.CommunityToolkit.Extensions;

    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class MyBikesPage : ContentPage, IViewService
    {
        /// <summary> Refernce to view model. </summary>
        MyBikesPageViewModel m_oViewModel = null;

        /// <summary>
        /// Constructs a my bikes page.
        /// </summary>
        public MyBikesPage()
        {
        }

        /// <summary>
        /// Invoked when page is shown. 
        /// Starts update process.
        /// </summary>
        protected async override void OnAppearing()
        {
            if (m_oViewModel != null)
            {
                // 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 MyBikesPageViewModel(
                    model.ActiveUser,
                    model.Permissions,
                    CrossBluetoothLE.Current,
                    Device.RuntimePlatform,
                    () => model.GetIsConnected(),
                    (isConnected) => model.GetConnector(isConnected),
                    model.Geolocation,
                    model.LocksServices.Active,
                    model.Polling,
                    (d, obj) => synchronizationContext.Post(d, obj),
                    this);
            }
            catch (Exception exception)
            {
                Log.ForContext<MyBikesPage>().Error("Displaying bikes at station page failed. {Exception}", exception);
                this.DisplayAlert("Fehler", $"Seite Räder an Station kann nicht angezeigt werden. ${exception.Message}", "OK");
                return;

            }

            InitializeComponent();

            BindingContext = m_oViewModel;
            MyBikesListView.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 (Example: Occured when page to querry for location permissions was opened)
                return;
            }

            await m_oViewModel.OnDisappearing();
        }

        /// <summary>
        /// Displays altert message.
        /// </summary>
        /// <param name="p_strTitle">Title of message.</param>
        /// <param name="p_strMessage">Message to display.</param>
        /// <param name="p_strCancel">Type of buttons.</param>
        public new async Task DisplayAlert(string p_strTitle, string p_strMessage, string p_strCancel)
        {
            await App.Current.MainPage.DisplayAlert(p_strTitle, p_strMessage, p_strCancel);
        }

        /// <summary> Displays altert 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="p_strTitle">Title of message.</param>
        /// <param name="p_strMessage">Message to display.</param>
        /// <param name="p_strAccept">Text of accept button.</param>
        /// <param name="p_strCancel">Text of button.</param>
        /// <returns>True if user pressed accept.</returns>
        public new async Task<bool> DisplayAlert(string p_strTitle, string p_strMessage, string p_strAccept, string p_strCancel)
        {
            return await App.Current.MainPage.DisplayAlert(p_strTitle, p_strMessage, p_strAccept, p_strCancel);
        }

        /// <summary>
        /// Creates and a page an shows it.
        /// </summary>
        /// <param name="p_oTypeOfPage">Type of page to show.</param>
        public void ShowPage(ViewTypes p_oType, string p_strTitle = null)
        {
            throw new NotSupportedException();
        }

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

        /// <summary> Pops a page from the modal stack. </summary>
        public Task PopModalAsync()
        {
            throw new NotSupportedException();
        }

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

        public async Task<IViewService.IUserFeedback> DisplayUserFeedbackPopup() => await Navigation.ShowPopupAsync<FeedbackPopup.Result>(new FeedbackPopup());
    }
}