sharee.bike-App/TINK/TINK/View/Map/MapPage.xaml.cs

using Plugin.Connectivity;
using System;
using System.Threading.Tasks;
using TINK.View.MasterDetail;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace TINK.View.Map
{
    using TINK.Model.Services.CopriApi.ServerUris;
    using TINK.ViewModel.Map;
    using Xamarin.Forms.GoogleMaps;

    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class MapPage : ContentPage, IViewService, IDetailPage
    {
        /// <summary> View model to notify about whether page appears or hides. </summary>
        private MapPageViewModel m_oMapPageViewModel;

        /// <summary>
        /// Constructs map page instance.
        /// </summary>
        public MapPage()
        {
            InitializeComponent();
        }

        /// <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 new 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)
        {
            m_oNavigationMasterDetail.ShowPage(p_oType.GetViewType(), p_strTitle);
        }

        /// <summary> Pushes a page onto the modal stack. </summary>
        /// <param name="p_oTypeOfPage">Type of page to display.</param>
        public async Task PushModalAsync(ViewTypes p_oTypeOfPage)
        {
            await Navigation.PushModalAsync((Page)Activator.CreateInstance(p_oTypeOfPage.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="p_oTypeOfPage">Page to display.</param>
        public async Task PushAsync(ViewTypes p_oTypeOfPage)
        {
            var page = Activator.CreateInstance(p_oTypeOfPage.GetViewType()) as IDetailPage;
            if (page == null)
            {
                return;
            }

            page.NavigationMasterDetail = m_oNavigationMasterDetail;

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

        public Task<IViewService.IUserFeedback> DisplayUserFeedbackPopup() => throw new NotSupportedException();

        /// <summary> Delegate to perform navigation. </summary>
        private INavigationMasterDetail m_oNavigationMasterDetail;

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

        /// <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.
#if TRYNOTBACKSTYLE
            m_oMapPageViewModel = new MapPageViewModel();
#else
            m_oMapPageViewModel = new MapPageViewModel(
                App.ModelRoot,
                (mapspan) => MyMap.MoveToRegion(mapspan),
                this,
                Navigation);
#endif

            BindingContext = m_oMapPageViewModel;

            if (Device.RuntimePlatform == Device.iOS)
            {
                TINKButton.BackgroundColor = Color.LightGray;
                TINKButton.BorderColor = Color.Black;
                TINKButton.Margin = new Thickness(10, 10, 10, 10);
                KonradButton.BackgroundColor = Color.LightGray;
                KonradButton.BorderColor = Color.Black;
                KonradButton.Margin = new Thickness(10, 10, 10, 10);
            }

            m_oMapPageViewModel.NavigationMasterDetail = m_oNavigationMasterDetail;

            base.OnAppearing();

            // Pre move and scanle maps to avoid initial display of map in Rome.
            MapPageViewModel.MoveAndScale(
                (mapSpan) => MyMap.MoveToRegion(mapSpan), 
                App.ModelRoot.Uris.ActiveUri, 
                App.ModelRoot.GroupFilterMapPage);
    
            await m_oMapPageViewModel.OnAppearing();
        }

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

            base.OnDisappearing();
        }
    }
}