Semi.Avalonia/src/Semi.Avalonia/Controls/SelectableTextBlock.axaml

<ResourceDictionary
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:CompileBindings="True">

    <MenuFlyout x:Key="SelectableTextBlockContextFlyout" Placement="Bottom">
        <MenuItem
            x:Name="SelectableTextBlockContextFlyoutCopyItem"
            Command="{Binding $parent[SelectableTextBlock].Copy}"
            Header="{DynamicResource STRING_MENU_COPY}"
            InputGesture="{x:Static TextBox.CopyGesture}"
            IsEnabled="{Binding $parent[SelectableTextBlock].CanCopy}" />
    </MenuFlyout>

    <ControlTheme x:Key="{x:Type SelectableTextBlock}" TargetType="SelectableTextBlock">
        <Setter Property="Foreground" Value="{DynamicResource TextBlockDefaultForeground}" />
        <Setter Property="FontSize" Value="{DynamicResource TextBlockFontSize}" />
        <Setter Property="Cursor" Value="Ibeam" />
        <Setter Property="SelectionBrush" Value="{DynamicResource TextBlockSelectionBackground}" />
        <Setter Property="SelectionForegroundBrush" Value="{DynamicResource TextBlockSelectionForeground}" />
        <Style Selector="^.Secondary">
            <Setter Property="Foreground" Value="{DynamicResource TextBlockSecondaryForeground}" />
        </Style>
        <Style Selector="^.Tertiary">
            <Setter Property="Foreground" Value="{DynamicResource TextBlockTertiaryForeground}" />
        </Style>
        <Style Selector="^.Quaternary">
            <Setter Property="Foreground" Value="{DynamicResource TextBlockQuaternaryForeground}" />
        </Style>
        <Style Selector="^.Success">
            <Setter Property="Foreground" Value="{DynamicResource TextBlockSuccessForeground}" />
        </Style>
        <Style Selector="^.Warning">
            <Setter Property="Foreground" Value="{DynamicResource TextBlockWarningForeground}" />
        </Style>
        <Style Selector="^.Danger">
            <Setter Property="Foreground" Value="{DynamicResource TextBlockDangerForeground}" />
        </Style>
        <Style Selector="^.Mark">
            <Setter Property="Background" Value="{DynamicResource TextBlockMarkBackground}" />
        </Style>
        <Style Selector="^.Underline">
            <Setter Property="TextDecorations" Value="Underline" />
        </Style>
        <Style Selector="^.Delete">
            <Setter Property="TextDecorations" Value="StrikeThrough" />
        </Style>
        <Style Selector="^.Underline.Delete">
            <Setter Property="TextDecorations">
                <TextDecorationCollection>
                    <TextDecoration Location="Underline" />
                    <TextDecoration Location="Strikethrough" />
                </TextDecorationCollection>
            </Setter>
        </Style>
        <Style Selector="^:disabled">
            <Setter Property="Foreground" Value="{DynamicResource TextBlockDisabledForeground}" />
        </Style>
        <Style Selector="^[IsEnabled=True]">
            <Setter Property="ContextFlyout" Value="{StaticResource SelectableTextBlockContextFlyout}" />
        </Style>
    </ControlTheme>
    <ControlTheme
        x:Key="TitleSelectableTextBlock"
        BasedOn="{StaticResource {x:Type SelectableTextBlock}}"
        TargetType="SelectableTextBlock">
        <Setter Property="SelectableTextBlock.FontWeight" Value="{DynamicResource TextBlockTitleFontWeight}" />
        <Style Selector="^.H1">
            <Setter Property="FontSize" Value="{DynamicResource TextBlockTitleH1FontSize}" />
        </Style>
        <Style Selector="^.H2">
            <Setter Property="FontSize" Value="{DynamicResource TextBlockTitleH2FontSize}" />
        </Style>
        <Style Selector="^.H3">
            <Setter Property="FontSize" Value="{DynamicResource TextBlockTitleH3FontSize}" />
        </Style>
        <Style Selector="^.H4">
            <Setter Property="FontSize" Value="{DynamicResource TextBlockTitleH4FontSize}" />
        </Style>
        <Style Selector="^.H5">
            <Setter Property="FontSize" Value="{DynamicResource TextBlockTitleH5FontSize}" />
        </Style>
        <Style Selector="^.H6">
            <Setter Property="FontSize" Value="{DynamicResource TextBlockTitleH6FontSize}" />
        </Style>
        <Style Selector="^:disabled">
            <Setter Property="Foreground" Value="{DynamicResource TextBlockDisabledForeground}" />
        </Style>
    </ControlTheme>
</ResourceDictionary>