feat: Fehlzeiten Calender

LehrerApp.Desktop/Views/Students/AttendanceCalendarConfigurationDialog.axaml

@@ -0,0 +1,39 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.Students"
+        xmlns:conv="clr-namespace:LehrerApp.Desktop.Converters"
+        x:Class="LehrerApp.Desktop.Views.Students.AttendanceCalendarConfigurationDialog"
+        x:DataType="vm:AttendanceCalendarConfigurationViewModel"
+        Title="Anwesenheitskalender konfigurieren" Width="440" Height="360"
+        CanResize="False" WindowStartupLocation="CenterOwner">
+  <Grid RowDefinitions="*,Auto" Margin="24,20">
+    <StackPanel Spacing="16">
+      <TextBlock Text="Anwesenheitskalender" Classes="dialogtitle"/>
+      <TextBlock Text="Diese Angaben steuern den dynamischen Kalender im Elternbrief. Der Starttag wird automatisch auf den ersten Tag des gewählten Monats gesetzt."
+                 FontSize="12" Opacity="0.65" TextWrapping="Wrap"/>
+      <StackPanel Spacing="4">
+        <TextBlock Text="Erster Monat" FontSize="12" Opacity="0.7"/>
+        <CalendarDatePicker SelectedDate="{Binding StartMonth, Converter={x:Static conv:DateTimeOffsetToDateTimeConverter.Instance}}"
+                            HorizontalAlignment="Stretch"/>
+      </StackPanel>
+      <Grid ColumnDefinitions="*,12,*">
+        <StackPanel Spacing="4">
+          <TextBlock Text="Anzahl Monate" FontSize="12" Opacity="0.7"/>
+          <ComboBox ItemsSource="{Binding MonthCounts}" SelectedItem="{Binding MonthCount, Mode=TwoWay}"
+                    HorizontalAlignment="Stretch"/>
+        </StackPanel>
+        <StackPanel Grid.Column="2" Spacing="4">
+          <TextBlock Text="Darstellungsgröße" FontSize="12" Opacity="0.7"/>
+          <ComboBox ItemsSource="{Binding Sizes}" SelectedItem="{Binding SelectedSize, Mode=TwoWay}"
+                    DisplayMemberBinding="{Binding DisplayName}" HorizontalAlignment="Stretch"/>
+        </StackPanel>
+      </Grid>
+      <TextBlock Text="Bei mehreren Monaten wächst der Zeicheninhalt nach unten. Für drei große Monate sollte die Vorlage eine ausreichend hohe DRAWBOX oder eine FLOWDRAWBOX verwenden."
+                 FontSize="11" Opacity="0.55" TextWrapping="Wrap"/>
+    </StackPanel>
+    <Grid Grid.Row="1" ColumnDefinitions="*,10,*" Margin="0,18,0,0">
+      <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/AttendanceCalendarConfigurationDialog.axaml.cs

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

LehrerApp.Desktop/Views/Students/CreateLetterDialog.axaml

@@ -44,6 +44,17 @@
             <CalendarDatePicker SelectedDate="{Binding LetterDate, Converter={x:Static conv:DateTimeOffsetToDateTimeConverter.Instance}}" HorizontalAlignment="Stretch"/>
           </StackPanel>
         </Grid>
+        <Border IsVisible="{Binding UsesAttendanceCalendar}" BorderBrush="{DynamicResource AppCardBorderBrush}"
+                BorderThickness="1" CornerRadius="6" Padding="12">
+          <Grid ColumnDefinitions="*,Auto">
+            <StackPanel Spacing="3">
+              <TextBlock Text="Anwesenheitskalender im Brief" FontWeight="SemiBold"/>
+              <TextBlock Text="{Binding AttendanceCalendarSummary}" FontSize="12" Opacity="0.65"/>
+            </StackPanel>
+            <Button Grid.Column="1" Content="Konfigurieren …" Click="OnConfigureAttendanceCalendar"
+                    VerticalAlignment="Center"/>
+          </Grid>
+        </Border>
         <StackPanel Spacing="4">
           <TextBlock Text="Brieftext" FontSize="12" Opacity="0.7"/>
           <TextBox Text="{Binding LetterText}" AcceptsReturn="True" TextWrapping="Wrap" MinHeight="110"

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

@@ -12,6 +12,8 @@ public partial class CreateLetterDialog : Window
     private async void OnGenerate(object? sender, RoutedEventArgs e)
     {
         if (DataContext is not CreateLetterDialogViewModel vm) return;
+        if (vm.UsesAttendanceCalendar && !vm.AttendanceCalendarConfigured &&
+            !await ConfigureAttendanceCalendar(vm)) return;
         var file = await StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
         {
             Title = "PDF-Brief speichern",
@@ -23,5 +25,19 @@ public partial class CreateLetterDialog : Window
         Close(file.Path.LocalPath);
     }
 
+    private async void OnConfigureAttendanceCalendar(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is CreateLetterDialogViewModel vm) await ConfigureAttendanceCalendar(vm);
+    }
+
+    private async Task<bool> ConfigureAttendanceCalendar(CreateLetterDialogViewModel vm)
+    {
+        var configVm = new AttendanceCalendarConfigurationViewModel(vm.GetAttendanceCalendarOptions());
+        var dialog = new AttendanceCalendarConfigurationDialog { DataContext = configVm };
+        if (!await dialog.ShowDialog<bool>(this)) return false;
+        vm.SetAttendanceCalendarOptions(configVm.BuildResult());
+        return true;
+    }
+
     private void OnCancel(object? sender, RoutedEventArgs e) => Close(null);
 }