Initial

LehrerApp.Desktop/Views/Students/StudentDetailView.axaml

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+<UserControl 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.StudentDetailView"
+             x:DataType="vm:StudentDetailViewModel">
+
+  <Grid RowDefinitions="Auto,Auto,*">
+
+    <!-- ── Header ──────────────────────────────────────────────────────── -->
+    <Border Grid.Row="0" Padding="20,16"
+            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
+            BorderThickness="0,0,0,1">
+      <Grid ColumnDefinitions="*,Auto">
+
+        <!-- Anzeigemodus -->
+        <StackPanel Grid.Column="0"
+                    IsVisible="{Binding !IsEditing}">
+          <TextBlock Text="{Binding StudentTitle}"
+                     FontSize="22" FontWeight="SemiBold"/>
+          <TextBlock Text="{Binding Student.DateOfBirth,
+                       StringFormat='Geb. {0:dd.MM.yyyy}',
+                       FallbackValue=''}"
+                     FontSize="12" Opacity="0.5"/>
+        </StackPanel>
+
+        <!-- Bearbeitungsmodus -->
+        <StackPanel Grid.Column="0" Spacing="6"
+                    IsVisible="{Binding IsEditing}">
+          <Grid ColumnDefinitions="*,8,*">
+            <TextBox Grid.Column="0"
+                     Text="{Binding EditFirstName}"
+                     Watermark="Vorname"/>
+            <TextBox Grid.Column="2"
+                     Text="{Binding EditLastName}"
+                     Watermark="Nachname"/>
+          </Grid>
+          <TextBox Text="{Binding EditNotes}"
+                   Watermark="Interne Notiz (optional)"
+                   AcceptsReturn="True" MaxHeight="80"/>
+        </StackPanel>
+
+        <!-- Aktions-Buttons -->
+        <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8"
+                    VerticalAlignment="Top">
+          <Button Content="Bearbeiten"
+                  Command="{Binding StartEditCommand}"
+                  IsVisible="{Binding !IsEditing}"/>
+          <Button Content="Speichern"
+                  Command="{Binding SaveEditCommand}"
+                  IsVisible="{Binding IsEditing}"/>
+          <Button Content="Abbrechen"
+                  Command="{Binding CancelEditCommand}"
+                  IsVisible="{Binding IsEditing}"/>
+        </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:StudentTab.Overview}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Noten"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:StudentTab.Grades}"
+                Background="Transparent" Padding="12,8"/>
+        <Button Content="Dokumentation"
+                Command="{Binding SwitchTabCommand}"
+                CommandParameter="{x:Static vm:StudentTab.Documentation}"
+                Background="Transparent" Padding="12,8"/>
+      </StackPanel>
+    </Border>
+
+    <!-- ── Tab-Inhalt ──────────────────────────────────────────────────── -->
+    <ScrollViewer Grid.Row="2" Padding="20">
+
+      <!-- Übersicht: Lerngruppen-Verlauf -->
+      <StackPanel IsVisible="{Binding ActiveTab,
+                    Converter={x:Static ObjectConverters.Equal},
+                    ConverterParameter={x:Static vm:StudentTab.Overview}}"
+                  Spacing="16">
+
+        <TextBlock Text="Lerngruppen" FontSize="15" FontWeight="SemiBold"/>
+        <ItemsControl ItemsSource="{Binding Enrollments}">
+          <ItemsControl.ItemTemplate>
+            <DataTemplate DataType="vm:EnrollmentEntry">
+              <Border Background="{DynamicResource SystemControlBackgroundAltHighBrush}"
+                      CornerRadius="6" Padding="12,8" Margin="0,0,0,6">
+                <Grid ColumnDefinitions="Auto,*,Auto">
+                  <TextBlock Grid.Column="0"
+                             Text="{Binding SchoolYear}"
+                             FontWeight="SemiBold" Width="70"/>
+                  <TextBlock Grid.Column="1"
+                             Text="{Binding GroupName}"
+                             Margin="8,0"/>
+                  <TextBlock Grid.Column="2"
+                             Text="{Binding Subject}"
+                             Opacity="0.5" FontSize="12"/>
+                </Grid>
+              </Border>
+            </DataTemplate>
+          </ItemsControl.ItemTemplate>
+        </ItemsControl>
+
+        <TextBlock Text="{Binding Student.Notes}"
+                   IsVisible="{Binding Student.Notes,
+                     Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
+                   Opacity="0.7" FontSize="13"
+                   TextWrapping="Wrap"/>
+      </StackPanel>
+
+      <!-- Dokumentation -->
+      <ItemsControl IsVisible="{Binding ActiveTab,
+                      Converter={x:Static ObjectConverters.Equal},
+                      ConverterParameter={x:Static vm:StudentTab.Documentation}}"
+                    ItemsSource="{Binding Documentation}">
+        <ItemsControl.ItemTemplate>
+          <DataTemplate DataType="vm:DocEntry">
+            <Border Background="{DynamicResource SystemControlBackgroundAltHighBrush}"
+                    CornerRadius="6" Padding="12,10" Margin="0,0,0,8">
+              <Grid ColumnDefinitions="Auto,*,Auto">
+                <TextBlock Grid.Column="0"
+                           Text="{Binding Date}"
+                           Opacity="0.5" FontSize="12" Width="80"/>
+                <StackPanel Grid.Column="1" Margin="8,0">
+                  <TextBlock Text="{Binding Title}"
+                             FontWeight="SemiBold" FontSize="13"/>
+                  <TextBlock Text="{Binding TypeLabel}"
+                             FontSize="11" Opacity="0.5"/>
+                </StackPanel>
+                <TextBlock Grid.Column="2"
+                           Text="🔒" FontSize="14"
+                           IsVisible="{Binding IsConfidential}"
+                           ToolTip.Tip="Vertraulich"/>
+              </Grid>
+            </Border>
+          </DataTemplate>
+        </ItemsControl.ItemTemplate>
+      </ItemsControl>
+
+    </ScrollViewer>
+  </Grid>
+
+</UserControl>