Skeleton.axaml

<ResourceDictionary
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:u="https://irihi.tech/ursa"
    xmlns:iri="https://irihi.tech/shared">
    <Design.PreviewWith>
        <Border Padding="20">
            <!--  Add Controls for Previewer Here  -->
        </Border>
    </Design.PreviewWith>
    <ControlTheme x:Key="{x:Type u:Skeleton}" TargetType="u:Skeleton">
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="Template">
            <ControlTemplate TargetType="u:Skeleton">
                <Border
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    ClipToBounds="{TemplateBinding ClipToBounds}"
                    CornerRadius="{TemplateBinding CornerRadius}">
                    <Panel>
                        <ContentPresenter
                            x:Name="PART_ContentPresenter"
                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                            Content="{TemplateBinding Content}"
                            ContentTemplate="{TemplateBinding ContentTemplate}" />
                        <iri:PureRectangle
                            x:Name="PART_LoadingBorder"
                            Classes.Active="{Binding Path= IsActive, RelativeSource={RelativeSource TemplatedParent}}"
                            IsHitTestVisible="{TemplateBinding IsLoading}"
                            Background="{DynamicResource SkeletonDefaultBackground}"
                            IsVisible="{TemplateBinding IsLoading}" />
                        <iri:PureRectangle
                            x:Name="PART_ActiveBorder"
                            IsHitTestVisible="{TemplateBinding IsLoading}"
                            IsVisible="{TemplateBinding IsLoading}" />
                    </Panel>
                </Border>
            </ControlTemplate>
        </Setter>
    </ControlTheme>
    <!--  Add Styles Here  -->
</ResourceDictionary>