Ursa.Avalonia/src/Ursa.Themes.Semi/Controls/Divider.axaml

<ResourceDictionary
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:u="https://irihi.tech/ursa">
    <Design.PreviewWith>
        <StackPanel Spacing="20">
            <u:Divider Content="Hello" />
        </StackPanel>
    </Design.PreviewWith>
    <!--  Add Resources Here  -->
    <ControlTheme x:Key="DividerLeftLine" TargetType="{x:Type Rectangle}">
        <Setter Property="Rectangle.Fill" Value="{DynamicResource DividerBorderBrush}" />
        <Setter Property="Rectangle.Height" Value="{DynamicResource SizeDividerWidth}" />
        <Setter Property="Rectangle.MinWidth" Value="{DynamicResource SizeDividerLeftMinWidth}" />
        <Setter Property="VerticalAlignment" Value="Center" />
    </ControlTheme>

    <ControlTheme x:Key="DividerRightLine" TargetType="{x:Type Rectangle}">
        <Setter Property="Rectangle.Fill" Value="{DynamicResource DividerBorderBrush}" />
        <Setter Property="Rectangle.Height" Value="{DynamicResource SizeDividerWidth}" />
        <Setter Property="Rectangle.MinWidth" Value="{DynamicResource SizeDividerRightMinWidth}" />
        <Setter Property="VerticalAlignment" Value="Center" />
    </ControlTheme>

    <ControlTheme x:Key="{x:Type u:Divider}" TargetType="u:Divider">
        <Setter Property="HorizontalContentAlignment" Value="Left" />
        <Setter Property="FontSize" Value="14" />

        <Style Selector="^[Orientation=Horizontal]">
            <Style Selector="^[HorizontalContentAlignment=Left]">
                <Setter Property="Template">
                    <ControlTemplate>
                        <Grid
                            Width="{TemplateBinding Width}"
                            Height="{TemplateBinding Height}"
                            ColumnDefinitions="Auto,Auto,*">
                            <Rectangle Theme="{StaticResource DividerLeftLine}" />
                            <ContentPresenter
                                Grid.Column="1"
                                Content="{TemplateBinding Content}"
                                Background="{TemplateBinding Background}"
                                Foreground="{TemplateBinding Foreground}"
                                ContentTemplate="{TemplateBinding ContentTemplate}"
                                Margin="{DynamicResource ThicknessDividerTextMargin}"
                                IsVisible="{Binding Content, RelativeSource={RelativeSource TemplatedParent}, Converter={x:Static ObjectConverters.IsNotNull}}"/>
                            <Rectangle Grid.Column="2" Theme="{StaticResource DividerRightLine}" />
                        </Grid>
                    </ControlTemplate>
                </Setter>
            </Style>
            <Style Selector="^[HorizontalContentAlignment=Right]">
                <Setter Property="Template">
                    <ControlTemplate>
                        <Grid
                            Width="{TemplateBinding Width}"
                            Height="{TemplateBinding Height}"
                            ColumnDefinitions="*,Auto,Auto">
                            <Rectangle Theme="{StaticResource DividerLeftLine}" />
                            <ContentPresenter
                                Grid.Column="1"
                                Content="{TemplateBinding Content}"
                                Background="{TemplateBinding Background}"
                                Foreground="{TemplateBinding Foreground}"
                                ContentTemplate="{TemplateBinding ContentTemplate}"
                                Margin="{DynamicResource ThicknessDividerTextMargin}"
                                IsVisible="{Binding Content, RelativeSource={RelativeSource TemplatedParent}, Converter={x:Static ObjectConverters.IsNotNull}}"/>
                            <Rectangle Grid.Column="2" Theme="{StaticResource DividerRightLine}" />
                        </Grid>
                    </ControlTemplate>
                </Setter>
            </Style>
            <Style Selector="^[HorizontalContentAlignment=Center]">
                <Setter Property="Template">
                    <ControlTemplate>
                        <Grid
                            Width="{TemplateBinding Width}"
                            Height="{TemplateBinding Height}"
                            ColumnDefinitions="*,Auto,*">
                            <Rectangle Theme="{StaticResource DividerLeftLine}" />
                            <ContentPresenter
                                Grid.Column="1"
                                Content="{TemplateBinding Content}"
                                Background="{TemplateBinding Background}"
                                Foreground="{TemplateBinding Foreground}"
                                ContentTemplate="{TemplateBinding ContentTemplate}"
                                Margin="{DynamicResource ThicknessDividerTextMargin}"
                                IsVisible="{Binding Content, RelativeSource={RelativeSource TemplatedParent}, Converter={x:Static ObjectConverters.IsNotNull}}"/>
                            <Rectangle Grid.Column="2" Theme="{StaticResource DividerRightLine}" />
                        </Grid>
                    </ControlTemplate>
                </Setter>
            </Style>
            <Style Selector="^[HorizontalContentAlignment=Stretch]">
                <Setter Property="Template">
                    <ControlTemplate>
                        <Grid
                            Width="{TemplateBinding Width}"
                            Height="{TemplateBinding Height}"
                            ColumnDefinitions="*,Auto,*">
                            <Rectangle Theme="{StaticResource DividerLeftLine}" />
                            <ContentPresenter
                                Grid.Column="1"
                                Content="{TemplateBinding Content}"
                                Background="{TemplateBinding Background}"
                                Foreground="{TemplateBinding Foreground}"
                                ContentTemplate="{TemplateBinding ContentTemplate}"
                                Margin="{DynamicResource ThicknessDividerTextMargin}"
                                IsVisible="{Binding Content, RelativeSource={RelativeSource TemplatedParent}, Converter={x:Static ObjectConverters.IsNotNull}}"/>
                            <Rectangle Grid.Column="2" Theme="{StaticResource DividerRightLine}" />
                        </Grid>
                    </ControlTemplate>
                </Setter>
            </Style>
        </Style>

        <Style Selector="^[Orientation=Vertical]">
            <Setter Property="Height" Value="{DynamicResource SizeDividerVerticalHeight}" />
            <Setter Property="Margin" Value="{DynamicResource ThicknessDividerVerticalMargin}" />
            <Setter Property="Width" Value="{DynamicResource SizeDividerWidth}" />
            <Setter Property="Template">
                <ControlTemplate>
                    <Rectangle
                        Width="{TemplateBinding Width}"
                        Height="{TemplateBinding Height}"
                        Fill="{DynamicResource DividerBorderBrush}" />
                </ControlTemplate>
            </Setter>
        </Style>
    </ControlTheme>
</ResourceDictionary>