sharee.bike-App/LastenradBayern/ShareeBike/View/Map/MapPage.xaml.cs

231 lines
7.4 KiB
C#
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using System;
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using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
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namespace ShareeBike.View.Map
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{
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using Serilog;
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using ShareeBike.Model.Bikes.BikeInfoNS.DriveNS.BatteryNS;
using ShareeBike.ViewModel.Map;
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[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class MapPage : ContentPage, IViewService
{
/// <summary> View model to notify about whether page appears or hides. </summary>
private MapPageViewModel MapPageViewModel { get; set; }
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/// <summary> Initialization status to ensure initialization logic is not called multiple times. </summary>
private bool isInitializationStarted = false;
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/// <summary>
/// Constructs map page instance.
/// </summary>
public MapPage()
{
InitializeComponent();
}
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/// <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);
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/// <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);
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/// <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);
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/// <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);
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/// <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);
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/// <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()));
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/// <summary> Pops a page from the modal stack. </summary>
public async Task PopModalAsync()
=> await Navigation.PopModalAsync();
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/// <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;
}
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await Navigation.PushAsync((Page)page);
}
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#if USCSHARP9
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public Task<IViewService.IUserFeedback> DisplayUserFeedbackPopup() => throw new NotSupportedException();
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#else
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public async Task<IUserFeedback> DisplayUserFeedbackPopup(IBatteryMutable battery = null) => throw new NotSupportedException();
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#endif
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/// <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;
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// Pass reference to member Navigation to show bikes at station x dialog.
try
{
Log.ForContext<MapPage>().Verbose("Constructing map page view model.");
MapPageViewModel = CreateMapPageViewModel();
}
catch (Exception exception)
{
Log.ForContext<MapPage>().Error("Constructing map page view model failed. {Exception}", exception);
isInitializationStarted = false;
return;
}
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try
{
BindingContext = MapPageViewModel;
}
catch (Exception exception)
{
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Log.ForContext<MapPage>().Error("Setting binding/ navigation on map page failed. {Exception}", exception);
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isInitializationStarted = false;
return;
}
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try
{
base.OnAppearing();
}
catch (Exception exception)
{
// Continue because styling is not essential.
Log.ForContext<MapPage>().Error("Invoking OnAppearing of base failed. {Exception}", exception);
}
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try
{
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// Premove and scale maps to avoid initial display of map in Rome.
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PremoveAndScaleMap();
}
catch (Exception exception)
{
// Continue because a map not beeing moved/ scaled is no reason for aborting startup.
Log.ForContext<MapPage>().Error("Moving and scaling map failed. {Exception}", exception);
}
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try
{
Log.ForContext<MapPage>().Verbose("Invoking OnAppearing on map page view model.");
await MapPageViewModel.OnAppearing();
}
catch (Exception exception)
{
Log.ForContext<MapPage>().Error("Invoking OnAppearing on map page view model failed. {Exception}", exception);
isInitializationStarted = false;
return;
}
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try
{
Log.ForContext<MapPage>().Verbose("Setting map settings.");
//show current user position (blue dot) and enable button for centering map manually.
MyMap.UiSettings.MyLocationButtonEnabled = MapPageViewModel.IsLocationPermissionGranted;
MyMap.IsShowingUser = MapPageViewModel.IsLocationPermissionGranted;
//disable +/- buttons
MyMap.UiSettings.ZoomControlsEnabled = false;
}
catch (Exception exception)
{
Log.ForContext<MapPage>().Verbose("Setting map settings failed. {Exception}", exception);
}
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isInitializationStarted = false;
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}
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/// <summary>
/// Premoves the Map to a certain location.
/// </summary>
private void PremoveAndScaleMap()
{
Log.ForContext<MapPage>().Verbose("Moving and scaling map.");
MapPageViewModel.MoveAndScale(
(mapSpan) => MyMap.MoveToRegion(mapSpan),
App.ModelRoot.ActiveMapSpan);
}
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/// <summary>
/// Creates the Map Page's view model.
/// </summary>
private MapPageViewModel CreateMapPageViewModel()
{
Log.ForContext<MapPage>().Verbose("Constructing map page view model.");
return new MapPageViewModel(
App.ModelRoot,
App.PermissionsService,
App.BluetoothService,
App.LocationServicesContainer.Active,
(mapspan) => MyMap.MoveToRegion(mapspan),
this,
Navigation);
}
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/// <summary>
/// Invoked when pages is closed/ hidden.
/// Stops update process.
/// </summary>
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protected async override void OnDisappearing()
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{
if (MapPageViewModel != null)
{
// View model might be null.
await MapPageViewModel?.OnDisappearing();
}
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base.OnDisappearing();
}
}
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}