Confirm Delete

Jugenddienst Stunden/ViewModels/StundeViewModel.cs

@@ -1,13 +1,7 @@
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
-using Jugenddienst_Stunden.Models;
 using Jugenddienst_Stunden.Types;
-using System;
-using System.Collections.Generic;
 using System.Collections.ObjectModel;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Input;
 
 namespace Jugenddienst_Stunden.ViewModels;
@@ -24,6 +18,7 @@ internal class StundeViewModel : ObservableObject, IQueryAttributable {
 
 	public event EventHandler<string> AlertEvent;
 	public event EventHandler<string> InfoEvent;
+	public event Func<string, string, Task<bool>> ConfirmEvent;
 
 
 	public ObservableCollection<Gemeinde> OptionsGemeinde { get; private set; }
@@ -70,6 +65,7 @@ internal class StundeViewModel : ObservableObject, IQueryAttributable {
 
 	public ICommand SaveCommand { get; private set; }
 	public ICommand DeleteCommand { get; private set; }
+	public ICommand DeleteConfirmCommand { get; private set; }
 	//public ICommand LoadDataCommand { get; private set; }
 
 
@@ -77,7 +73,8 @@ internal class StundeViewModel : ObservableObject, IQueryAttributable {
 		_stunde = new DayTime();
 
 		SaveCommand = new AsyncRelayCommand(Save);
-		DeleteCommand = new AsyncRelayCommand(Delete);
+		//DeleteCommand = new AsyncRelayCommand(Delete);
+		DeleteConfirmCommand = new Command(async () => await DeleteConfirm());
 
 
 	}
@@ -86,7 +83,7 @@ internal class StundeViewModel : ObservableObject, IQueryAttributable {
 		_stunde = stunde;
 
 		SaveCommand = new AsyncRelayCommand(Save);
-		DeleteCommand = new AsyncRelayCommand(Delete);
+		DeleteConfirmCommand = new AsyncRelayCommand(DeleteConfirm);
 	}
 
 	private async Task LoadData() {
@@ -118,10 +115,24 @@ internal class StundeViewModel : ObservableObject, IQueryAttributable {
 		await Shell.Current.GoToAsync($"..?date={_stunde.day.ToString("yyyy-MM-dd")}");
 	}
 
+	private async Task DeleteConfirm() {
+		if (ConfirmEvent != null) {
+			bool answer = await ConfirmEvent.Invoke("Achtung", "Löschen kann nicht ungeschehen gemacht werden. Fortfahren?");
+			if (answer) {
+				//Löschen
+				await Models.Stunde.DeleteEntry(_stunde);
+				await Shell.Current.GoToAsync($"..?date={_stunde.day.ToString("yyyy-MM-dd")}");
+			} else { //nicht Löschen
+			}
+		}
+
+	}
+
 
 
 
 	async void IQueryAttributable.ApplyQueryAttributes(IDictionary<string, object> query) {
+		var probe = query;
 		if (query.ContainsKey("load")) {
 
 			//DateTime heute = DateTime.Now;

Jugenddienst Stunden/Views/StundePage.xaml

@@ -43,7 +43,7 @@
 
         <Grid ColumnDefinitions="*,*" ColumnSpacing="4">
             <Button Text="Speichern" Command="{Binding SaveCommand}" />
-            <Button Grid.Column="1" Text="Löschen" Command="{Binding DeleteCommand}" />
+            <Button Grid.Column="1" Text="Löschen" Command="{Binding DeleteConfirmCommand}" />
         </Grid>
     </VerticalStackLayout>
 </ContentPage>

Jugenddienst Stunden/Views/StundePage.xaml.cs

@@ -1,13 +1,30 @@
-using Jugenddienst_Stunden.Types;
-using System.ComponentModel;
+using Jugenddienst_Stunden.ViewModels;
+using System.Windows.Input;
 
 namespace Jugenddienst_Stunden.Views;
 
-public partial class StundePage : ContentPage
-{
+public partial class StundePage : ContentPage {
 
-	public StundePage()
-	{
+	public ICommand DeleteConfirmCommand { get; }
+
+	public StundePage() {
 		InitializeComponent();
+
+		if (BindingContext is StundeViewModel vm) {
+			//vm.AlertEvent += Vm_AlertEvent;
+			//vm.InfoEvent += Vm_InfoEvent;
+			vm.ConfirmEvent += ShowConfirm;
 		}
+	}
+
+
+	private void Vm_AlertEvent(object? sender, string e) {
+		DisplayAlert("Fehler:", e, "OK");
+	}
+
+
+	private async Task<bool> ShowConfirm(string title, string message) {
+		return await DisplayAlert(title, message, "Passt!", "Na, nor decht nit.");
+	}
+
 }