Avalonia/samples/ControlCatalog/Pages/TransitioningContentControlPage.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:vm="using:ControlCatalog.ViewModels"
             xmlns:converter="clr-namespace:ControlCatalog.Converter"
             xmlns:system="using:System"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:DataType="vm:TransitioningContentControlPageViewModel"
             x:CompileBindings="True"
             x:Class="ControlCatalog.Pages.TransitioningContentControlPage">

    <UserControl.DataContext>
        <vm:TransitioningContentControlPageViewModel />
    </UserControl.DataContext>

    <UserControl.Styles>
        <Style Selector="HeaderedContentControl">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto" SharedSizeGroup="HeaderCol" />
                                <ColumnDefinition Width="*" />
                            </Grid.ColumnDefinitions>
                            <ContentPresenter Content="{TemplateBinding Header}" 
                                              Grid.Column="0" 
                                              VerticalAlignment="Center" />
                            <ContentPresenter Content="{TemplateBinding Content}" 
                                              Grid.Column="1" 
                                              VerticalAlignment="Center" />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </UserControl.Styles>
  
  <UserControl.Resources>
    <converter:MathSubtractConverter x:Key="MathSubtractConverter" />
    <system:Double x:Key="TopMargin">8</system:Double>
  </UserControl.Resources>
  
    <DockPanel LastChildFill="True" 
               Height="{Binding Path=Bounds.Height, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Grid}, Converter={StaticResource MathSubtractConverter},ConverterParameter={StaticResource TopMargin}}">

        <TextBlock DockPanel.Dock="Top" Classes="h2">The TransitioningContentControl control allows you to show a page transition whenever the Content changes.</TextBlock>

        <ExperimentalAcrylicBorder DockPanel.Dock="Bottom" Margin="10" CornerRadius="5" >
            <ExperimentalAcrylicBorder.Material>
                <ExperimentalAcrylicMaterial BackgroundSource="Digger" TintColor="White" />
            </ExperimentalAcrylicBorder.Material>
            
            <StackPanel Margin="5" Spacing="5" Grid.IsSharedSizeScope="True">
                <HeaderedContentControl Header="Select a transition">
                     <ComboBox Items="{Binding PageTransitions}" SelectedItem="{Binding SelectedTransition}" />
                </HeaderedContentControl>
                <HeaderedContentControl Header="Duration">
                     <NumericUpDown Value="{Binding Duration}" Increment="250" Minimum="100" />
                </HeaderedContentControl>
                <HeaderedContentControl Header="Clip to Bounds">
                    <ToggleSwitch IsChecked="{Binding ClipToBounds}" />
                </HeaderedContentControl>
            </StackPanel>
        </ExperimentalAcrylicBorder>

        <Button DockPanel.Dock="Left" Command="{Binding PrevImage}" Content="&lt;" />
        <Button DockPanel.Dock="Right" Command="{Binding NextImage}" Content=">" />
        
        <Border ClipToBounds="{Binding ClipToBounds}" Margin="5">
            <TransitioningContentControl Content="{Binding SelectedImage}"
                                         PageTransition="{Binding SelectedTransition.Transition}" >
                <TransitioningContentControl.ContentTemplate>
                    <DataTemplate DataType="Bitmap">
                        <Image Source="{Binding}"  />
                    </DataTemplate>
                </TransitioningContentControl.ContentTemplate>
            </TransitioningContentControl>
        </Border>
    </DockPanel>
</UserControl>