fix: Briefe Kontaktauswahl

LehrerApp.Desktop.Tests/CreateLetterDialogViewModelTests.cs

@@ -191,6 +191,49 @@ public sealed class CreateLetterDialogViewModelTests : IDisposable
         Assert.True(vm.Generate(output));
     }
 
+    [Fact]
+    public void AddressPreview_FolgtDemGewaehltenKontaktUndAktualisiertSichBeimWechsel()
+    {
+        var student = new Student
+        {
+            FirstName = "Lena", LastName = "Beispiel",
+            Contacts =
+            [
+                new Contact { Name = "Frau Beispiel", Relation = "Mutter", Street = "Erste Str. 1", PostalCode = "11111", City = "Erststadt" },
+                new Contact { Name = "Herr Beispiel", Relation = "Vater", Street = "Zweite Str. 2", PostalCode = "22222", City = "Zweitstadt" },
+            ],
+        };
+        var vm = Build(student, StoreWithTemplate(new PlaceholderDefinition("Anrede", PlaceholderType.Text, true)));
+
+        Assert.Equal(2, vm.Contacts.Count);
+        Assert.Contains("Frau Beispiel", vm.AddressPreview);
+        Assert.Contains("Erste Str. 1", vm.AddressPreview);
+
+        vm.SelectedContact = vm.Contacts.Single(c => c.Model.Name == "Herr Beispiel");
+
+        Assert.Contains("Herr Beispiel", vm.AddressPreview);
+        Assert.Contains("Zweite Str. 2", vm.AddressPreview);
+        Assert.DoesNotContain("Frau Beispiel", vm.AddressPreview);
+    }
+
+    [Fact]
+    public void SelectContactDialog_StartetBeimAktuellenKontaktUndAktualisiertVorschau()
+    {
+        var contacts = new List<LetterContactChoice>
+        {
+            new(new Contact { Name = "Frau Beispiel", Street = "Erste Str. 1", PostalCode = "11111", City = "Erststadt" }),
+            new(new Contact { Name = "Herr Beispiel", Street = "Zweite Str. 2", PostalCode = "22222", City = "Zweitstadt" }),
+        };
+        var dialogVm = new SelectContactDialogViewModel(contacts, contacts[1]);
+
+        Assert.Same(contacts[1], dialogVm.SelectedContact);
+        Assert.Contains("Zweite Str. 2", dialogVm.AddressPreview);
+
+        dialogVm.SelectedContact = contacts[0];
+
+        Assert.Contains("Erste Str. 1", dialogVm.AddressPreview);
+    }
+
     private CreateLetterDialogViewModel Build(Student student, TemplateStore store) =>
         new(student, store, new QuestTemplateRenderer(), new FakeMemberships([]), new FakeGroups([]));
 

LehrerApp.Desktop/Services/LetterPlaceholderBuilder.cs

@@ -18,8 +18,7 @@ public static class LetterPlaceholderBuilder
         string letterText, string teacherName, DrawingValue? attendanceCalendar = null,
         DrawingValue? absenceDays = null)
     {
-        var cityLine = string.Join(" ", new[] { contact?.PostalCode, contact?.City }.Where(x => !string.IsNullOrWhiteSpace(x)));
-        var address = string.Join(Environment.NewLine, new[] { contact?.Name, contact?.Street, cityLine }.Where(x => !string.IsNullOrWhiteSpace(x)));
+        var address = FormatAddress(contact);
         return new Dictionary<string, PlaceholderValue>(StringComparer.Ordinal)
         {
             ["Datum"] = new DateValue(date), ["CurrentDate"] = new DateValue(date),
@@ -36,6 +35,14 @@ public static class LetterPlaceholderBuilder
         };
     }
 
+    /// <summary>Mehrzeilige Anschrift (Name/Straße/PLZ Ort) für Adressvorschau im Dialog und
+    /// den <c>Contact.Address</c>-Platzhalter - eine Formatierung für beide Verwendungen.</summary>
+    public static string FormatAddress(Contact? contact)
+    {
+        var cityLine = string.Join(" ", new[] { contact?.PostalCode, contact?.City }.Where(x => !string.IsNullOrWhiteSpace(x)));
+        return string.Join(Environment.NewLine, new[] { contact?.Name, contact?.Street, cityLine }.Where(x => !string.IsNullOrWhiteSpace(x)));
+    }
+
     public static bool IsEmpty(PlaceholderValue value) => value switch
     {
         TextValue x => string.IsNullOrWhiteSpace(x.Value),

LehrerApp.Desktop/Services/StudentAttendanceCalendarDrawingBuilder.cs

@@ -37,9 +37,14 @@ public static class StudentAttendanceCalendarDrawingBuilder
             AttendanceCalendarSize.Large => 1f,
             _ => .85f,
         };
-        var contentWidth = width * scale;
+        // Die Breite richtet sich nach der DRAWBOX-Deklaration im Layout-Skript (fest, unabhängig
+        // von der Größenwahl) - nur Schrift/Zellenhöhe skalieren mit "Größe". Würde die Breite mit
+        // skalieren, würde "Groß" (scale=1) exakt die Skript-Box ausfüllen, "Klein"/"Normal" aber
+        // nur einen Teil davon - und eine größere Skalierung als 1 liefe über die Box hinaus und
+        // würde am rechten Rand abgeschnitten (SVG overflow="hidden").
+        var contentWidth = width;
         var cellHeight = 10 * scale;
-        var monthGapX = 6 * scale;
+        var monthGapX = 10f;
         var first = options.NormalizedStartMonth;
         var monthCount = options.NormalizedMonthCount;
         var monthWidth = (contentWidth - monthGapX * (monthCount - 1)) / monthCount;
@@ -112,8 +117,10 @@ public static class StudentAbsenceDayListDrawingBuilder
             AttendanceCalendarSize.Large => 1f,
             _ => .88f,
         };
-        var contentWidth = width * scale;
-        var rowHeight = 9 * scale;
+        // Breite bleibt an die DRAWBOX-Deklaration im Layout-Skript gebunden (siehe
+        // StudentAttendanceCalendarDrawingBuilder) - nur Zeilenhöhe/Schrift skalieren mit "Größe".
+        var contentWidth = width;
+        var rowHeight = 12 * scale;
         var start = options.NormalizedStartMonth;
         var end = start.AddMonths(options.NormalizedMonthCount).AddDays(-1);
         var rows = absences
@@ -130,17 +137,17 @@ public static class StudentAbsenceDayListDrawingBuilder
             DrawingTextAlignment.AlignLeft, 8 * scale, Color: "#6B7280"));
         y += 10 * scale + 2 * scale;
         commands.Add(new DrawRectangle(0, y, contentWidth, rowHeight, "#CBD5E1", .4f, "#F3F4F6"));
-        commands.Add(new DrawStringEx(2 * scale, y + scale, rowHeight - scale, 31 * scale, "Datum",
+        commands.Add(new DrawStringEx(2, y + scale, rowHeight - scale, 31, "Datum",
             DrawingTextAlignment.AlignLeft, 7.5f * scale, Color: "#374151", Bold: true));
-        commands.Add(new DrawStringEx(36 * scale, y + scale, rowHeight - scale, 75 * scale, "Umfang",
+        commands.Add(new DrawStringEx(36, y + scale, rowHeight - scale, 75, "Umfang",
             DrawingTextAlignment.AlignLeft, 7.5f * scale, Color: "#374151", Bold: true));
-        commands.Add(new DrawStringEx(113 * scale, y + scale, rowHeight - scale, 55 * scale, "Status",
+        commands.Add(new DrawStringEx(113, y + scale, rowHeight - scale, 55, "Status",
             DrawingTextAlignment.AlignLeft, 7.5f * scale, Color: "#374151", Bold: true));
         y += rowHeight;
 
         if (rows.Count == 0)
         {
-            commands.Add(new DrawStringEx(2 * scale, y + 2 * scale, rowHeight, contentWidth - 4 * scale,
+            commands.Add(new DrawStringEx(2, y + 2 * scale, rowHeight, contentWidth - 4,
                 "Keine Fehltage im gewählten Zeitraum", DrawingTextAlignment.AlignLeft, 8 * scale,
                 Color: "#6B7280", Italic: true));
             y += rowHeight + 3 * scale;
@@ -163,12 +170,12 @@ public static class StudentAbsenceDayListDrawingBuilder
                         : row.FriendlyStatusLabel;
                 var statusColor = row.IsUnexcused ? "#C62828" : "#2E7D32";
                 commands.Add(new DrawRectangle(0, y, contentWidth, rowHeight, "#E5E7EB", .3f, fill));
-                commands.Add(new DrawStringEx(2 * scale, y + scale, rowHeight - scale, 31 * scale,
+                commands.Add(new DrawStringEx(2, y + scale, rowHeight - scale, 31,
                     row.Date.ToString("dd.MM.yyyy"), DrawingTextAlignment.AlignLeft, 7.5f * scale,
                     Color: "#374151"));
-                commands.Add(new DrawStringEx(36 * scale, y + scale, rowHeight - scale, 75 * scale,
+                commands.Add(new DrawStringEx(36, y + scale, rowHeight - scale, 75,
                     extent, DrawingTextAlignment.AlignLeft, 7.5f * scale, Color: "#374151"));
-                commands.Add(new DrawStringEx(113 * scale, y + scale, rowHeight - scale, 55 * scale,
+                commands.Add(new DrawStringEx(113, y + scale, rowHeight - scale, 55,
                     status, DrawingTextAlignment.AlignLeft, 7.5f * scale, Color: statusColor,
                     Bold: row.IsUnexcused));
                 y += rowHeight;

LehrerApp.Desktop/ViewModels/Students/CreateLetterDialogViewModel.cs

@@ -44,6 +44,8 @@ public partial class CreateLetterDialogViewModel : ObservableObject
     public bool HasCustomPlaceholders => CustomPlaceholders.Count > 0;
     public bool HasNoTemplates => Templates.Count == 0;
     public bool HasNoContacts => Contacts.Count == 0;
+    public string AddressPreview => LetterPlaceholderBuilder.FormatAddress(SelectedContact?.Model);
+    public bool HasAddressPreview => !string.IsNullOrWhiteSpace(AddressPreview);
     public bool UsesAttendanceAdvancedContent => UsesAttendanceCalendar || UsesAbsenceDayList;
     public string SuggestedFileName => SanitizeFileName(
         $"{SelectedTemplate?.Name ?? "Elternbrief"}_{_student.LastName}_{_student.FirstName}.pdf");
@@ -82,6 +84,8 @@ public partial class CreateLetterDialogViewModel : ObservableObject
     partial void OnSelectedContactChanged(LetterContactChoice? value)
     {
         Anrede = value?.Model.LetterSalutation ?? "";
+        OnPropertyChanged(nameof(AddressPreview));
+        OnPropertyChanged(nameof(HasAddressPreview));
         RefreshValidation();
     }
     partial void OnAnredeChanged(string value) => RefreshValidation();

LehrerApp.Desktop/ViewModels/Students/SelectContactDialogViewModel.cs

@@ -0,0 +1,25 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using LehrerApp.Desktop.Services;
+
+namespace LehrerApp.Desktop.ViewModels.Students;
+
+public partial class SelectContactDialogViewModel : ObservableObject
+{
+    [ObservableProperty] private LetterContactChoice? _selectedContact;
+
+    public IReadOnlyList<LetterContactChoice> Contacts { get; }
+    public string AddressPreview => LetterPlaceholderBuilder.FormatAddress(SelectedContact?.Model);
+    public bool HasAddressPreview => !string.IsNullOrWhiteSpace(AddressPreview);
+
+    public SelectContactDialogViewModel(IReadOnlyList<LetterContactChoice> contacts, LetterContactChoice? current)
+    {
+        Contacts = contacts;
+        SelectedContact = current ?? contacts.FirstOrDefault();
+    }
+
+    partial void OnSelectedContactChanged(LetterContactChoice? value)
+    {
+        OnPropertyChanged(nameof(AddressPreview));
+        OnPropertyChanged(nameof(HasAddressPreview));
+    }
+}

LehrerApp.Desktop/Views/Students/CreateLetterDialog.axaml

@@ -26,11 +26,17 @@
                      Classes="emptyhint" IsVisible="{Binding HasNoTemplates}"/>
         </StackPanel>
         <StackPanel Spacing="4">
-          <TextBlock Text="Kontakt *" FontSize="12" Opacity="0.7"/>
-          <ComboBox ItemsSource="{Binding Contacts}" SelectedItem="{Binding SelectedContact}"
-                    DisplayMemberBinding="{Binding Display}" HorizontalAlignment="Stretch"/>
-          <TextBlock Text="Kein aktueller Kontakt vorhanden." Classes="emptyhint"
-                     IsVisible="{Binding HasNoContacts}"/>
+          <TextBlock Text="Anschrift *" FontSize="12" Opacity="0.7"/>
+          <Border BorderBrush="{DynamicResource AppCardBorderBrush}" BorderThickness="1" CornerRadius="6" Padding="10">
+            <Grid ColumnDefinitions="*,Auto">
+              <TextBlock Grid.Column="0" Text="{Binding AddressPreview}" TextWrapping="Wrap"
+                         VerticalAlignment="Center" IsVisible="{Binding HasAddressPreview}"/>
+              <TextBlock Grid.Column="0" Text="Kein aktueller Kontakt vorhanden." Classes="emptyhint"
+                         VerticalAlignment="Center" IsVisible="{Binding HasNoContacts}"/>
+              <Button Grid.Column="1" Content="Kontakt wechseln …" Click="OnSelectContact"
+                      IsEnabled="{Binding !HasNoContacts}" VerticalAlignment="Center"/>
+            </Grid>
+          </Border>
         </StackPanel>
         <StackPanel Spacing="4">
           <TextBlock Text="Anrede *" FontSize="12" Opacity="0.7"/>

LehrerApp.Desktop/Views/Students/CreateLetterDialog.axaml.cs

@@ -30,6 +30,14 @@ public partial class CreateLetterDialog : Window
         if (DataContext is CreateLetterDialogViewModel vm) await ConfigureAttendanceCalendar(vm);
     }
 
+    private async void OnSelectContact(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is not CreateLetterDialogViewModel vm) return;
+        var dialogVm = new SelectContactDialogViewModel(vm.Contacts, vm.SelectedContact);
+        var dialog = new SelectContactDialog { DataContext = dialogVm };
+        if (await dialog.ShowDialog<bool>(this)) vm.SelectedContact = dialogVm.SelectedContact;
+    }
+
     private async Task<bool> ConfigureAttendanceCalendar(CreateLetterDialogViewModel vm)
     {
         var configVm = new AttendanceCalendarConfigurationViewModel(vm.GetAttendanceCalendarOptions());

LehrerApp.Desktop/Views/Students/SelectContactDialog.axaml

@@ -0,0 +1,33 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.Students"
+        x:Class="LehrerApp.Desktop.Views.Students.SelectContactDialog"
+        x:DataType="vm:SelectContactDialogViewModel"
+        Title="Kontakt wählen" Width="380" Height="440"
+        CanResize="False" WindowStartupLocation="CenterOwner">
+
+  <Grid RowDefinitions="Auto,*,Auto,Auto" Margin="24">
+
+    <TextBlock Grid.Row="0" Text="Kontakt für Anrede und Anschrift" Classes="dialogtitle" Margin="0,0,0,12"/>
+
+    <ListBox Grid.Row="1" ItemsSource="{Binding Contacts}" SelectedItem="{Binding SelectedContact}"
+             BorderThickness="1">
+      <ListBox.ItemTemplate>
+        <DataTemplate x:DataType="vm:LetterContactChoice">
+          <TextBlock Text="{Binding Display}" Padding="4,2"/>
+        </DataTemplate>
+      </ListBox.ItemTemplate>
+    </ListBox>
+
+    <Border Grid.Row="2" BorderBrush="{DynamicResource AppCardBorderBrush}" BorderThickness="1" CornerRadius="6"
+            Padding="10" Margin="0,12,0,0" IsVisible="{Binding HasAddressPreview}">
+      <TextBlock Text="{Binding AddressPreview}" TextWrapping="Wrap" FontSize="12"/>
+    </Border>
+
+    <Grid Grid.Row="3" ColumnDefinitions="*,10,*" Margin="0,16,0,0">
+      <Button Grid.Column="0" Content="Abbrechen" HorizontalAlignment="Stretch" Click="OnCancel"/>
+      <Button Grid.Column="2" Content="Übernehmen" HorizontalAlignment="Stretch" Click="OnApply"/>
+    </Grid>
+
+  </Grid>
+</Window>

LehrerApp.Desktop/Views/Students/SelectContactDialog.axaml.cs

@@ -0,0 +1,12 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+
+namespace LehrerApp.Desktop.Views.Students;
+
+public partial class SelectContactDialog : Window
+{
+    public SelectContactDialog() => InitializeComponent();
+
+    private void OnApply(object? sender, RoutedEventArgs e) => Close(true);
+    private void OnCancel(object? sender, RoutedEventArgs e) => Close(false);
+}