Initial

LehrerApp.Desktop/Views/Groups/AddGroupDialog.axaml

@@ -0,0 +1,109 @@
+<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.AddGroupDialog"
+        x:DataType="vm:AddGroupDialogViewModel"
+        Title="Neue Lerngruppe"
+        Width="420" Height="480"
+        CanResize="False"
+        WindowStartupLocation="CenterOwner">
+
+  <Grid RowDefinitions="*,Auto" Margin="24">
+
+    <StackPanel Grid.Row="0" Spacing="16">
+
+      <TextBlock Text="Neue Lerngruppe anlegen"
+                 FontSize="18" FontWeight="SemiBold"/>
+
+      <!-- Name -->
+      <StackPanel Spacing="4">
+        <TextBlock Text="Name *" FontSize="12" Opacity="0.7"/>
+        <TextBox Text="{Binding Name}"
+                 Watermark="z.B. 10E, Q1 Chemie, 5a"/>
+      </StackPanel>
+
+      <!-- Fach -->
+      <StackPanel Spacing="4">
+        <TextBlock Text="Fach" FontSize="12" Opacity="0.7"/>
+        <TextBox Text="{Binding Subject}"
+                 Watermark="z.B. Chemie, Mathematik"/>
+      </StackPanel>
+
+      <!-- Typ und Klassenstufe nebeneinander -->
+      <Grid ColumnDefinitions="*,12,*">
+        <StackPanel Grid.Column="0" Spacing="4">
+          <TextBlock Text="Typ" FontSize="12" Opacity="0.7"/>
+          <ComboBox ItemsSource="{Binding GroupTypes}"
+                    SelectedItem="{Binding Type}"
+                    HorizontalAlignment="Stretch">
+            <ComboBox.ItemTemplate>
+              <DataTemplate DataType="vm:GroupTypeItem">
+                <TextBlock Text="{Binding Label}"/>
+              </DataTemplate>
+            </ComboBox.ItemTemplate>
+          </ComboBox>
+        </StackPanel>
+
+        <StackPanel Grid.Column="2" Spacing="4">
+          <TextBlock Text="Klassenstufe *" FontSize="12" Opacity="0.7"/>
+          <NumericUpDown Value="{Binding GradeLevel}"
+                         Minimum="1" Maximum="13"
+                         FormatString="0"/>
+        </StackPanel>
+      </Grid>
+
+      <!-- Notensystem und Schuljahr -->
+      <Grid ColumnDefinitions="*,12,*">
+        <StackPanel Grid.Column="0" Spacing="4">
+          <TextBlock Text="Notensystem" FontSize="12" Opacity="0.7"/>
+          <ComboBox ItemsSource="{Binding GradingSystems}"
+                    SelectedItem="{Binding GradingSystem}"
+                    HorizontalAlignment="Stretch">
+            <ComboBox.ItemTemplate>
+              <DataTemplate DataType="vm:GradingSystemItem">
+                <TextBlock Text="{Binding Label}" TextWrapping="Wrap"/>
+              </DataTemplate>
+            </ComboBox.ItemTemplate>
+          </ComboBox>
+        </StackPanel>
+
+        <StackPanel Grid.Column="2" Spacing="4">
+          <TextBlock Text="Schuljahr" FontSize="12" Opacity="0.7"/>
+          <ComboBox ItemsSource="{Binding SchoolYears}"
+                    SelectedItem="{Binding SelectedSchoolYear}"
+                    HorizontalAlignment="Stretch"/>
+        </StackPanel>
+      </Grid>
+
+      <!-- Wochenstunden -->
+      <StackPanel Spacing="4">
+        <TextBlock Text="Wochenstunden (optional)" FontSize="12" Opacity="0.7"/>
+        <NumericUpDown Value="{Binding HoursPerWeek}"
+                       Minimum="1" Maximum="20"
+                       FormatString="0"
+                       AllowSpin="True"/>
+      </StackPanel>
+
+      <!-- Validierungsfehler -->
+      <TextBlock Text="{Binding ValidationMessage}"
+                 Foreground="Red" FontSize="12"
+                 IsVisible="{Binding ValidationMessage,
+                   Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+
+    </StackPanel>
+
+    <!-- ── Buttons ──────────────────────────────────────────────────────── -->
+    <Grid Grid.Row="1" ColumnDefinitions="*,8,*" Margin="0,16,0,0">
+      <Button Grid.Column="0"
+              Content="Abbrechen"
+              HorizontalAlignment="Stretch"
+              Click="OnCancel"/>
+      <Button Grid.Column="2"
+              Content="Anlegen"
+              HorizontalAlignment="Stretch"
+              Click="OnSave"/>
+    </Grid>
+
+  </Grid>
+
+</Window>

LehrerApp.Desktop/Views/Groups/AddGroupDialog.axaml.cs

@@ -0,0 +1,33 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+
+namespace LehrerApp.Desktop.Views.Groups;
+
+public partial class AddGroupDialog : Window
+{
+    public bool Saved { get; private set; }
+
+    public AddGroupDialog()
+    {
+        InitializeComponent();
+    }
+
+    private void OnSave(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is ViewModels.Groups.AddGroupDialogViewModel vm)
+        {
+            if (vm.SaveCommand.CanExecute(null))
+            {
+                vm.SaveCommand.Execute(null);
+                if (vm.Result is not null)
+                {
+                    Saved = true;
+                    Close(true);
+                }
+            }
+        }
+    }
+
+    private void OnCancel(object? sender, RoutedEventArgs e) =>
+        Close(false);
+}

LehrerApp.Desktop/Views/Groups/GroupDetailView.axaml

@@ -0,0 +1,129 @@
+<UserControl 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.GroupDetailView"
+             x:DataType="vm:GroupDetailViewModel">
+
+  <Grid RowDefinitions="Auto,Auto,*">
+
+    <!-- ── Header ──────────────────────────────────────────────────────── -->
+    <Border Grid.Row="0" Padding="20,16"
+            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+            BorderThickness="0,0,0,1">
+      <Grid ColumnDefinitions="*,Auto">
+        <StackPanel Grid.Column="0">
+          <TextBlock Text="{Binding GroupTitle}"
+                     FontSize="22" FontWeight="SemiBold"/>
+          <TextBlock FontSize="12" Opacity="0.5">
+            <Run Text="{Binding StudentCount}"/>
+            <Run Text="Schüler"/>
+          </TextBlock>
+        </StackPanel>
+        <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
+          <Button Content="+ Schüler"
+                  Command="{Binding AddStudentCommand}"/>
+          <Button Content="+ Klausur"
+                  Command="{Binding AddExamCommand}"/>
+        </StackPanel>
+      </Grid>
+    </Border>
+
+    <!-- ── Tab-Leiste ──────────────────────────────────────────────────── -->
+    <Border Grid.Row="1"
+            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+            BorderThickness="0,0,0,1"
+            Padding="16,0">
+      <StackPanel Orientation="Horizontal" Spacing="4">
+        <Button Content="Übersicht"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Overview}"
+                Classes.active="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Overview}}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Schüler"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Students}"
+                Classes.active="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Students}}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Klausuren"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Exams}"
+                Classes.active="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Exams}}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Noten"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Grades}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Planung"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Planner}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Dokumentation"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:GroupTab.Documentation}"
+                Background="Transparent" Padding="12,8"/>
+      </StackPanel>
+    </Border>
+
+    <!-- ── Tab-Inhalt ──────────────────────────────────────────────────── -->
+    <ScrollViewer Grid.Row="2" Padding="20">
+
+      <!-- Schülerliste -->
+      <DataGrid ItemsSource="{Binding Students}"
+                IsVisible="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Students}}"
+                AutoGenerateColumns="False"
+                IsReadOnly="True"
+                GridLinesVisibility="Horizontal"
+                CanUserReorderColumns="False"
+                CanUserResizeColumns="True">
+        <DataGrid.Columns>
+          <DataGridTextColumn Header="Name"
+                              Binding="{Binding FullName}"
+                              Width="*"/>
+        </DataGrid.Columns>
+      </DataGrid>
+
+      <!-- Klausuren -->
+      <DataGrid ItemsSource="{Binding Exams}"
+                IsVisible="{Binding ActiveTab,
+                  Converter={x:Static ObjectConverters.Equal},
+                  ConverterParameter={x:Static vm:GroupTab.Exams}}"
+                AutoGenerateColumns="False"
+                IsReadOnly="True"
+                GridLinesVisibility="Horizontal"
+                CanUserReorderColumns="False">
+        <DataGrid.Columns>
+          <DataGridTextColumn Header="Datum"
+                              Binding="{Binding Date}"
+                              Width="100"/>
+          <DataGridTextColumn Header="Titel"
+                              Binding="{Binding Title}"
+                              Width="*"/>
+          <DataGridTextColumn Header="Status"
+                              Binding="{Binding Status}"
+                              Width="120"/>
+        </DataGrid.Columns>
+      </DataGrid>
+
+      <!-- Übersicht (Platzhalter) -->
+      <StackPanel IsVisible="{Binding ActiveTab,
+                    Converter={x:Static ObjectConverters.Equal},
+                    ConverterParameter={x:Static vm:GroupTab.Overview}}"
+                  Spacing="12">
+        <TextBlock Text="Übersicht" FontSize="16" FontWeight="SemiBold"/>
+        <TextBlock Text="Hier erscheint eine Zusammenfassung der Lerngruppe."
+                   Opacity="0.5"/>
+      </StackPanel>
+
+    </ScrollViewer>
+
+  </Grid>
+
+</UserControl>

LehrerApp.Desktop/Views/Groups/GroupListView.axaml

@@ -0,0 +1,100 @@
+<UserControl 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.GroupListView"
+             x:DataType="vm:GroupListViewModel">
+
+  <Grid RowDefinitions="Auto,*">
+
+    <!-- ── Toolbar ─────────────────────────────────────────────────────── -->
+    <Border Grid.Row="0" Padding="20,16"
+            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+            BorderThickness="0,0,0,1">
+      <Grid ColumnDefinitions="*,Auto,Auto">
+
+        <StackPanel Grid.Column="0">
+          <TextBlock Text="Lerngruppen" FontSize="22" FontWeight="SemiBold"/>
+          <TextBlock FontSize="12" Opacity="0.5">
+            <Run Text="{Binding Groups.Count}"/>
+            <Run Text="Gruppen ·"/>
+            <Run Text="{Binding SelectedSchoolYear}"/>
+          </TextBlock>
+        </StackPanel>
+
+        <!-- Schuljahr-Auswahl -->
+        <ComboBox Grid.Column="1"
+                  ItemsSource="{Binding SchoolYears}"
+                  SelectedItem="{Binding SelectedSchoolYear}"
+                  Width="100" Margin="0,0,8,0"
+                  VerticalAlignment="Center"/>
+
+        <!-- Neue Gruppe -->
+        <Button Grid.Column="2"
+                Content="+ Neue Gruppe"
+                Command="{Binding AddGroupCommand}"
+                VerticalAlignment="Center"/>
+      </Grid>
+    </Border>
+
+    <!-- ── Inhalt ──────────────────────────────────────────────────────── -->
+    <Grid Grid.Row="1" ColumnDefinitions="260,*">
+
+      <!-- Suchliste links -->
+      <Border Grid.Column="0"
+              BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+              BorderThickness="0,0,1,0">
+        <DockPanel>
+          <TextBox DockPanel.Dock="Top"
+                   Text="{Binding SearchText}"
+                   Watermark="Suchen…"
+                   Margin="12,8"/>
+          <ListBox ItemsSource="{Binding Groups}"
+                   SelectedItem="{Binding SelectedGroup}">
+            <ListBox.ItemTemplate>
+              <DataTemplate DataType="vm:GroupListItem">
+                <Grid ColumnDefinitions="4,*" Margin="0,4">
+                  <Border Grid.Column="0" Width="4" CornerRadius="2"
+                          Background="{DynamicResource SystemAccentColor}"
+                          Margin="0,0,10,0"/>
+                  <StackPanel Grid.Column="1">
+                    <Grid ColumnDefinitions="*,Auto">
+                      <TextBlock Grid.Column="0"
+                                 Text="{Binding Name}"
+                                 FontWeight="SemiBold" FontSize="13"/>
+                      <TextBlock Grid.Column="1"
+                                 Text="{Binding TypeLabel}"
+                                 FontSize="11" Opacity="0.5"/>
+                    </Grid>
+                    <TextBlock Text="{Binding Subject}"
+                               FontSize="12" Opacity="0.65"
+                               IsVisible="{Binding Subject,
+                                 Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+                    <TextBlock Text="{Binding GradingLabel}"
+                               FontSize="11" Opacity="0.4"/>
+                  </StackPanel>
+                </Grid>
+              </DataTemplate>
+            </ListBox.ItemTemplate>
+          </ListBox>
+        </DockPanel>
+      </Border>
+
+      <!-- Detail rechts – Platzhalter bis Gruppe gewählt -->
+      <Border Grid.Column="1">
+        <StackPanel HorizontalAlignment="Center"
+                    VerticalAlignment="Center"
+                    Spacing="8"
+                    IsVisible="{Binding !SelectedGroup}">
+          <TextBlock Text="Keine Gruppe ausgewählt"
+                     FontSize="16" Opacity="0.4"
+                     HorizontalAlignment="Center"/>
+          <TextBlock Text="Wähle eine Gruppe aus der Liste oder lege eine neue an."
+                     FontSize="12" Opacity="0.3"
+                     HorizontalAlignment="Center"/>
+        </StackPanel>
+      </Border>
+
+    </Grid>
+  </Grid>
+
+</UserControl>

LehrerApp.Desktop/Views/Groups/GroupViews.cs

@@ -0,0 +1,13 @@
+using Avalonia.Controls;
+
+namespace LehrerApp.Desktop.Views.Groups;
+
+public partial class GroupListView : UserControl
+{
+    public GroupListView() => InitializeComponent();
+}
+
+public partial class GroupDetailView : UserControl
+{
+    public GroupDetailView() => InitializeComponent();
+}