LehrerApp/LehrerApp.Desktop/Views/Groups/StudentGroupGeneratorWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.Groups"
        x:Class="LehrerApp.Desktop.Views.Groups.StudentGroupGeneratorWindow"
        x:DataType="vm:StudentGroupGeneratorViewModel"
        Title="Gruppen zusammenstellen"
        Width="780" Height="650" MinWidth="620" MinHeight="480"
        WindowStartupLocation="CenterScreen">

  <Grid RowDefinitions="Auto,*,Auto,Auto" Margin="24">
    <StackPanel Grid.Row="0" Spacing="3" Margin="0,0,0,16">
      <TextBlock Text="Gruppen zusammenstellen" Classes="dialogtitle"/>
      <TextBlock Text="Eigenständiges Fenster für die Bildschirmfreigabe"
                 FontSize="12" Opacity="0.55"/>
    </StackPanel>

    <ScrollViewer Grid.Row="1">
      <Grid x:Name="GroupResults">
        <Grid.Transitions>
          <Transitions>
            <DoubleTransition Property="Opacity" Duration="0:0:0.18"/>
          </Transitions>
        </Grid.Transitions>

        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Spacing="12"
                    IsVisible="{Binding !HasGeneratedGroups}">
          <TextBlock Text="◇  ◇  ◇" FontSize="26" Opacity="0.35" HorizontalAlignment="Center"/>
          <TextBlock Text="Noch keine Gruppen erstellt" FontSize="20" FontWeight="SemiBold"
                     HorizontalAlignment="Center"/>
          <TextBlock Text="{Binding StatusText}" Opacity="0.6" TextAlignment="Center"
                     TextWrapping="Wrap" MaxWidth="460"/>
        </StackPanel>

        <ItemsControl ItemsSource="{Binding GeneratedGroups}"
                      IsVisible="{Binding HasGeneratedGroups}">
          <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
              <WrapPanel Orientation="Horizontal" HorizontalAlignment="Center"/>
            </ItemsPanelTemplate>
          </ItemsControl.ItemsPanel>
          <ItemsControl.ItemTemplate>
            <DataTemplate x:DataType="vm:GeneratedStudentGroup">
              <Border Width="220" Margin="7" Padding="16"
                      Background="{DynamicResource AppCardBackgroundBrush}"
                      BorderBrush="{DynamicResource AppCardBorderBrush}"
                      BorderThickness="1" CornerRadius="12">
                <StackPanel Spacing="9">
                  <TextBlock Text="{Binding Title}" FontSize="16" FontWeight="SemiBold"
                             Foreground="{DynamicResource AppAccentTextBrush}"/>
                  <ItemsControl ItemsSource="{Binding Members}">
                    <ItemsControl.ItemTemplate>
                      <DataTemplate x:DataType="vm:StudentGroupMember">
                        <TextBlock Text="{Binding Name}" Margin="0,3" TextWrapping="Wrap"/>
                      </DataTemplate>
                    </ItemsControl.ItemTemplate>
                  </ItemsControl>
                </StackPanel>
              </Border>
            </DataTemplate>
          </ItemsControl.ItemTemplate>
        </ItemsControl>
      </Grid>
    </ScrollViewer>

    <StackPanel Grid.Row="2" Spacing="8" Margin="0,12,0,10">
      <Button Content="Gruppen zusammenstellen" Click="OnGenerate"
              IsEnabled="{Binding CanGenerate}" HorizontalAlignment="Stretch"
              HorizontalContentAlignment="Center" Height="48" FontSize="16" FontWeight="SemiBold"/>
      <TextBlock Text="{Binding StatusText}" HorizontalAlignment="Center" Opacity="0.65"
                 IsVisible="{Binding HasGeneratedGroups}"/>
      <Border Background="{DynamicResource AppChipBackgroundBrush}" CornerRadius="8" Padding="10,7"
              IsVisible="{Binding WarningText, Converter={x:Static StringConverters.IsNotNullOrEmpty}}">
        <TextBlock Text="{Binding WarningText}" TextWrapping="Wrap" FontSize="12"
                   Foreground="{DynamicResource AppStatusWarningBrush}"/>
      </Border>
    </StackPanel>

    <Expander Grid.Row="3" Header="Optionen" IsExpanded="False">
      <ScrollViewer MaxHeight="340">
        <StackPanel Spacing="11" Margin="0,10,6,4">
          <Grid ColumnDefinitions="*,16,*">
            <StackPanel Grid.Column="0" Spacing="5">
              <TextBlock Text="Lerngruppe" FontSize="12" Opacity="0.7"/>
              <ComboBox ItemsSource="{Binding Groups}" SelectedItem="{Binding SelectedGroup}">
                <ComboBox.ItemTemplate>
                  <DataTemplate x:DataType="vm:StudentDrawGroup">
                    <TextBlock Text="{Binding Name}"/>
                  </DataTemplate>
                </ComboBox.ItemTemplate>
              </ComboBox>
            </StackPanel>
            <StackPanel Grid.Column="2" Spacing="5">
              <TextBlock Text="Teilnehmende" FontSize="12" Opacity="0.7"/>
              <ComboBox ItemsSource="{Binding ParticipantModeOptions}"
                        SelectedItem="{Binding ParticipantModeName}"/>
            </StackPanel>
          </Grid>

          <Grid ColumnDefinitions="*,16,*" Margin="0,5,0,0">
            <StackPanel Grid.Column="0" Spacing="5">
              <TextBlock Text="Zielgröße je Gruppe" FontSize="12" Opacity="0.7"/>
              <NumericUpDown Value="{Binding TargetGroupSize}" Minimum="2" Maximum="20"
                             Increment="1" FormatString="0"/>
            </StackPanel>
            <StackPanel Grid.Column="2" Spacing="5">
              <TextBlock Text="Zielanzahl Gruppen" FontSize="12" Opacity="0.7"/>
              <NumericUpDown Value="{Binding TargetGroupCount}" Minimum="1" Maximum="20"
                             Increment="1" FormatString="0"/>
            </StackPanel>
          </Grid>

          <Grid ColumnDefinitions="160,*,110" RowDefinitions="Auto,Auto,Auto" Margin="0,6,0,0">
            <TextBlock Grid.Row="0" Text="Priorität Zielgröße" VerticalAlignment="Center"/>
            <Slider Grid.Row="0" Grid.Column="1" Minimum="0" Maximum="100"
                    Value="{Binding SizePriority}" Margin="10,0"/>
            <TextBlock Grid.Row="0" Grid.Column="2" Text="{Binding SizePriorityLabel}"
                       HorizontalAlignment="Right" VerticalAlignment="Center" FontSize="12" Opacity="0.7"/>

            <TextBlock Grid.Row="1" Text="Priorität Gruppenanzahl" VerticalAlignment="Center"/>
            <Slider Grid.Row="1" Grid.Column="1" Minimum="0" Maximum="100"
                    Value="{Binding CountPriority}" Margin="10,0"/>
            <TextBlock Grid.Row="1" Grid.Column="2" Text="{Binding CountPriorityLabel}"
                       HorizontalAlignment="Right" VerticalAlignment="Center" FontSize="12" Opacity="0.7"/>

            <TextBlock Grid.Row="2" Text="Leistungsverteilung" VerticalAlignment="Center"/>
            <Slider Grid.Row="2" Grid.Column="1" Minimum="-100" Maximum="100"
                    Value="{Binding PerformanceDistribution}" Margin="10,0"/>
            <TextBlock Grid.Row="2" Grid.Column="2" Text="{Binding PerformanceDistributionLabel}"
                       HorizontalAlignment="Right" VerticalAlignment="Center" FontSize="12" Opacity="0.7"/>
          </Grid>
          <Grid ColumnDefinitions="*,*" Margin="170,-7,110,0">
            <TextBlock Text="homogen" FontSize="10" Opacity="0.5"/>
            <TextBlock Grid.Column="1" Text="heterogen" HorizontalAlignment="Right" FontSize="10" Opacity="0.5"/>
          </Grid>

          <CheckBox Content="Förderschüler möglichst gleichmäßig verteilen"
                    IsChecked="{Binding DistributeSupportStudents}" Margin="0,5,0,0"/>

          <Border Height="1" Background="{DynamicResource AppCardBorderBrush}" Margin="0,5"/>
          <TextBlock Text="Paarregeln" FontWeight="SemiBold"/>
          <TextBlock Text="Zwei Schüler auswählen und anschließend festlegen, ob sie zusammen oder getrennt arbeiten sollen."
                     FontSize="11" Opacity="0.55" TextWrapping="Wrap"/>
          <Grid ColumnDefinitions="*,12,*" Margin="0,2,0,0">
            <ComboBox Grid.Column="0" ItemsSource="{Binding PairCandidates}"
                      SelectedItem="{Binding SelectedPairStudentA}" PlaceholderText="Erster Schüler">
              <ComboBox.ItemTemplate>
                <DataTemplate x:DataType="vm:StudentPairCandidate">
                  <TextBlock Text="{Binding Name}"/>
                </DataTemplate>
              </ComboBox.ItemTemplate>
            </ComboBox>
            <ComboBox Grid.Column="2" ItemsSource="{Binding PairCandidates}"
                      SelectedItem="{Binding SelectedPairStudentB}" PlaceholderText="Zweiter Schüler">
              <ComboBox.ItemTemplate>
                <DataTemplate x:DataType="vm:StudentPairCandidate">
                  <TextBlock Text="{Binding Name}"/>
                </DataTemplate>
              </ComboBox.ItemTemplate>
            </ComboBox>
          </Grid>
          <Grid ColumnDefinitions="*,12,*">
            <Button Grid.Column="0" Content="Zusammen einteilen" Command="{Binding AddForcedPairCommand}"
                    HorizontalAlignment="Stretch"/>
            <Button Grid.Column="2" Content="Voneinander trennen" Command="{Binding AddExcludedPairCommand}"
                    HorizontalAlignment="Stretch"/>
          </Grid>
          <TextBlock Text="{Binding PairingMessage}" Foreground="{DynamicResource AppStatusWarningBrush}"
                     FontSize="11" IsVisible="{Binding PairingMessage, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>

          <Grid ColumnDefinitions="160,*,110" RowDefinitions="Auto,Auto">
            <TextBlock Grid.Row="0" Text="Priorität zusammen" VerticalAlignment="Center"/>
            <Slider Grid.Row="0" Grid.Column="1" Minimum="0" Maximum="100"
                    Value="{Binding ForcedPairPriority}" Margin="10,0"/>
            <TextBlock Grid.Row="0" Grid.Column="2" Text="{Binding ForcedPairPriorityLabel}"
                       HorizontalAlignment="Right" VerticalAlignment="Center" FontSize="12" Opacity="0.7"/>
            <TextBlock Grid.Row="1" Text="Priorität trennen" VerticalAlignment="Center"/>
            <Slider Grid.Row="1" Grid.Column="1" Minimum="0" Maximum="100"
                    Value="{Binding ExcludedPairPriority}" Margin="10,0"/>
            <TextBlock Grid.Row="1" Grid.Column="2" Text="{Binding ExcludedPairPriorityLabel}"
                       HorizontalAlignment="Right" VerticalAlignment="Center" FontSize="12" Opacity="0.7"/>
          </Grid>

          <Grid ColumnDefinitions="*,12,*">
            <StackPanel Grid.Column="0" Spacing="5">
              <TextBlock Text="Zusammen" FontSize="12" Opacity="0.7"/>
              <ItemsControl ItemsSource="{Binding ForcedPairs}">
                <ItemsControl.ItemTemplate>
                  <DataTemplate x:DataType="vm:StudentPairRule">
                    <Grid ColumnDefinitions="*,Auto" Margin="0,2">
                      <TextBlock Text="{Binding Display}" TextWrapping="Wrap" VerticalAlignment="Center"/>
                      <Button Grid.Column="1" Content="×" Command="{Binding RemoveCommand}"
                              ToolTip.Tip="Regel entfernen" Padding="8,2"/>
                    </Grid>
                  </DataTemplate>
                </ItemsControl.ItemTemplate>
              </ItemsControl>
            </StackPanel>
            <StackPanel Grid.Column="2" Spacing="5">
              <TextBlock Text="Getrennt" FontSize="12" Opacity="0.7"/>
              <ItemsControl ItemsSource="{Binding ExcludedPairs}">
                <ItemsControl.ItemTemplate>
                  <DataTemplate x:DataType="vm:StudentPairRule">
                    <Grid ColumnDefinitions="*,Auto" Margin="0,2">
                      <TextBlock Text="{Binding Display}" TextWrapping="Wrap" VerticalAlignment="Center"/>
                      <Button Grid.Column="1" Content="×" Command="{Binding RemoveCommand}"
                              ToolTip.Tip="Regel entfernen" Padding="8,2"/>
                    </Grid>
                  </DataTemplate>
                </ItemsControl.ItemTemplate>
              </ItemsControl>
            </StackPanel>
          </Grid>
        </StackPanel>
      </ScrollViewer>
    </Expander>
  </Grid>
</Window>