PolyTraderSharp/src/PolyTrader.App.Avalonia/Controls/SettingsEditor.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="using:PolyTrader.App.Avalonia.ViewModels"
             x:Class="PolyTrader.App.Avalonia.Controls.SettingsEditor">

    <!--
      Ersatz für das WinForms-PropertyGrid. Aufbau nach Vorgabe:
      Kategorie-Überschrift (fett), darunter je Feld eine Zeile aus Beschriftung links und
      Steuerelement rechts; ein etwaiger Erklärungstext steht klein unter dem Feld.

      Vollständig deklarativ: WELCHE Felder es gibt, liefert das Datenmodell
      (SettingsModelBuilder liest Category/DisplayName/Description/Browsable vom Einstellungs-
      objekt). WIE ein Feld aussieht, steht hier — je Feldtyp ein DataTemplate. Damit bleibt die
      Layout-Regel gewahrt und alle Einstellungsfenster sehen automatisch gleich aus.
    -->
    <UserControl.Resources>
        <!-- Einheitliche Beschriftungsspalte: sorgt für die saubere Flucht aller Felder. -->
        <x:Double x:Key="LabelWidth">210</x:Double>
    </UserControl.Resources>

    <UserControl.Styles>
        <Style Selector="TextBlock.sectionTitle">
            <Setter Property="FontWeight" Value="Bold" />
            <Setter Property="Margin" Value="0,16,0,8" />
        </Style>
        <Style Selector="TextBlock.fieldLabel">
            <Setter Property="VerticalAlignment" Value="Center" />
            <Setter Property="Margin" Value="0,0,12,0" />
        </Style>
        <Style Selector="TextBlock.fieldHint">
            <Setter Property="FontSize" Value="11" />
            <Setter Property="Foreground" Value="{DynamicResource AppMutedTextBrush}" />
            <Setter Property="TextWrapping" Value="Wrap" />
            <Setter Property="Margin" Value="0,2,0,0" />
        </Style>
        <Style Selector="Grid.fieldRow">
            <Setter Property="Margin" Value="0,0,0,8" />
        </Style>
    </UserControl.Styles>

    <ScrollViewer>
        <ItemsControl Name="sections" Margin="16,0,16,16">
            <ItemsControl.ItemTemplate>
                <DataTemplate x:DataType="vm:SettingsSection">
                    <StackPanel>
                        <TextBlock Classes="sectionTitle" Text="{Binding Title}" />

                        <ItemsControl ItemsSource="{Binding Fields}">
                            <ItemsControl.DataTemplates>

                                <!-- Freitext -->
                                <DataTemplate DataType="vm:TextSettingsField">
                                    <Grid Classes="fieldRow" ColumnDefinitions="210,*">
                                        <TextBlock Grid.Column="0" Classes="fieldLabel" Text="{Binding Label}" />
                                        <StackPanel Grid.Column="1">
                                            <TextBox Text="{Binding Value, Mode=TwoWay}" IsEnabled="{Binding IsEditable}" />
                                            <TextBlock Classes="fieldHint" Text="{Binding Description}"
                                                       IsVisible="{Binding HasDescription}" />
                                        </StackPanel>
                                    </Grid>
                                </DataTemplate>

                                <!-- Ganzzahl -->
                                <DataTemplate DataType="vm:IntSettingsField">
                                    <Grid Classes="fieldRow" ColumnDefinitions="210,*">
                                        <TextBlock Grid.Column="0" Classes="fieldLabel" Text="{Binding Label}" />
                                        <StackPanel Grid.Column="1">
                                            <TextBox Text="{Binding Value, Mode=TwoWay}" IsEnabled="{Binding IsEditable}"
                                                     MaxWidth="160" HorizontalAlignment="Left" />
                                            <TextBlock Classes="fieldHint" Text="{Binding Description}"
                                                       IsVisible="{Binding HasDescription}" />
                                        </StackPanel>
                                    </Grid>
                                </DataTemplate>

                                <!-- Ja/Nein -->
                                <DataTemplate DataType="vm:BoolSettingsField">
                                    <Grid Classes="fieldRow" ColumnDefinitions="210,*">
                                        <TextBlock Grid.Column="0" Classes="fieldLabel" Text="{Binding Label}" />
                                        <StackPanel Grid.Column="1">
                                            <CheckBox IsChecked="{Binding Value, Mode=TwoWay}" IsEnabled="{Binding IsEditable}" />
                                            <TextBlock Classes="fieldHint" Text="{Binding Description}"
                                                       IsVisible="{Binding HasDescription}" />
                                        </StackPanel>
                                    </Grid>
                                </DataTemplate>

                                <!-- Auswahl -->
                                <DataTemplate DataType="vm:ChoiceSettingsField">
                                    <Grid Classes="fieldRow" ColumnDefinitions="210,*">
                                        <TextBlock Grid.Column="0" Classes="fieldLabel" Text="{Binding Label}" />
                                        <StackPanel Grid.Column="1">
                                            <ComboBox ItemsSource="{Binding Options}"
                                                      SelectedItem="{Binding Value, Mode=TwoWay}"
                                                      IsEnabled="{Binding IsEditable}"
                                                      HorizontalAlignment="Stretch" />
                                            <TextBlock Classes="fieldHint" Text="{Binding Description}"
                                                       IsVisible="{Binding HasDescription}" />
                                        </StackPanel>
                                    </Grid>
                                </DataTemplate>

                                <!-- Reine Anzeige -->
                                <DataTemplate DataType="vm:ReadOnlySettingsField">
                                    <Grid Classes="fieldRow" ColumnDefinitions="210,*">
                                        <TextBlock Grid.Column="0" Classes="fieldLabel" Text="{Binding Label}" />
                                        <StackPanel Grid.Column="1">
                                            <SelectableTextBlock Text="{Binding Value}" VerticalAlignment="Center"
                                                                 Foreground="{DynamicResource AppReadOnlyTextBrush}" />
                                            <TextBlock Classes="fieldHint" Text="{Binding Description}"
                                                       IsVisible="{Binding HasDescription}" />
                                        </StackPanel>
                                    </Grid>
                                </DataTemplate>

                            </ItemsControl.DataTemplates>
                        </ItemsControl>
                    </StackPanel>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </ScrollViewer>

</UserControl>