Disable DElButton when nothing to delete

Jugenddienst Stunden/Converter/IntBoolConverter.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Jugenddienst_Stunden.Converter;
+public class IntBoolConverter : IValueConverter {
+
+	public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture) {
+		if (value is int) {
+			return (int)value != 0;
+		}
+		return false;
+	}
+
+
+	public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture) {
+		if (value is bool) {
+			return (bool)value ? 1 : 0;
+		}
+		return 0;
+	}
+}

Jugenddienst Stunden/Views/StundePage.xaml

@@ -2,6 +2,7 @@
 <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:models="clr-namespace:Jugenddienst_Stunden.ViewModels"
+             xmlns:conv="clr-namespace:Jugenddienst_Stunden.Converter"
              x:Class="Jugenddienst_Stunden.Views.StundePage"
              Title="{Binding Title}">
 
@@ -9,6 +10,12 @@
         <models:StundeViewModel />
     </ContentPage.BindingContext>
 
+    <ContentPage.Resources>
+        <ResourceDictionary>
+            <conv:IntBoolConverter x:Key="IntBoolConverter" />
+        </ResourceDictionary>
+    </ContentPage.Resources>
+
     <VerticalStackLayout Spacing="10" Margin="10">
         
         <Label Text="{Binding SubTitle}" />
@@ -43,7 +50,7 @@
 
         <Grid ColumnDefinitions="*,*" ColumnSpacing="4">
             <Button Text="Speichern" Command="{Binding SaveCommand}" />
-            <Button Grid.Column="1" Text="Löschen" Command="{Binding DeleteConfirmCommand}" />
+            <Button Grid.Column="1" Text="Löschen" Command="{Binding DeleteConfirmCommand}" IsEnabled="{Binding Stunde.id, Converter={StaticResource IntBoolConverter}}" />
         </Grid>
         
         <BoxView HeightRequest="1" Color="Red" Margin="5,10"/>