Themes/RunningTextStyle.xaml

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<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:ctrls="clr-namespace:Micro.Ui.RunningTextStyle.Controls">
    
    <ControlTemplate x:Key="Template.Horizontal" TargetType="{x:Type ctrls:RunningText}">
        <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"
                Padding="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
            <Canvas x:Name="PART_Canvas" ClipToBounds="{TemplateBinding ClipToBounds}" Height="{Binding ActualHeight,ElementName=PART_Txt1}" VerticalAlignment="Center">
                <TextBlock x:Name="PART_Txt1" Text="{TemplateBinding Text}" />
                <TextBlock x:Name="PART_Txt2" Text="{TemplateBinding Text}" />
            </Canvas>
        </Border>
    </ControlTemplate>
    
    <ControlTemplate x:Key="Template.Vertical" TargetType="{x:Type ctrls:RunningText}">
        <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"
                Padding="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
            <Canvas x:Name="PART_Canvas" ClipToBounds="{TemplateBinding ClipToBounds}" MinWidth="{TemplateBinding FontSize}" HorizontalAlignment="Center">
                <TextBlock x:Name="PART_Txt1" Text="{TemplateBinding Text}" TextWrapping="Wrap" MaxWidth="{Binding ActualWidth,ElementName=PART_Canvas}" />
                <TextBlock x:Name="PART_Txt2" Text="{TemplateBinding Text}" TextWrapping="Wrap" MaxWidth="{Binding ActualWidth,ElementName=PART_Canvas}" />
            </Canvas>
        </Border>
    </ControlTemplate>

    <Style TargetType="{x:Type ctrls:RunningText}">
        <Setter Property="Padding" Value="6 3" />
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="IsHitTestVisible" Value="False" />
        <Setter Property="ClipToBounds" Value="True" />
        <Style.Triggers>
            <Trigger Property="Direction" Value="RightToLeft">
                <Setter Property="Template" Value="{StaticResource Template.Horizontal}" />
            </Trigger>
            <Trigger Property="Direction" Value="LeftToRight">
                <Setter Property="Template" Value="{StaticResource Template.Horizontal}" />
            </Trigger>
            <Trigger Property="Direction" Value="BottomToTop">
                <Setter Property="Template" Value="{StaticResource Template.Vertical}" />
            </Trigger>
            <Trigger Property="Direction" Value="TopToBottom">
                <Setter Property="Template" Value="{StaticResource Template.Vertical}" />
            </Trigger>
        </Style.Triggers>
    </Style>
</ResourceDictionary>