Avalonia/samples/ControlCatalog/Pages/ItemsRepeaterPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:viewModels="using:ControlCatalog.ViewModels"
             x:Class="ControlCatalog.Pages.ItemsRepeaterPage"
             x:DataType="viewModels:ItemsRepeaterPageViewModel">
  <UserControl.Styles>
    <Style Selector="ItemsRepeater TextBlock.oddTemplate">
      <Setter Property="Background" Value="Yellow" />
      <Setter Property="Foreground" Value="Black" />
    </Style>
    <Style Selector="ItemsRepeater TextBlock.evenTemplate">
      <Setter Property="Background" Value="Wheat" />
      <Setter Property="Foreground" Value="Black" />
    </Style>
    <Style Selector="ItemsRepeater TextBlock:nth-child(5n+3)">
      <Setter Property="Foreground" Value="Red" />
      <Setter Property="FontWeight" Value="Bold" />
    </Style>
    <Style Selector="ItemsRepeater TextBlock:nth-last-child(5n+4)">
      <Setter Property="Foreground" Value="Blue" />
      <Setter Property="FontWeight" Value="Bold" />
    </Style>
  </UserControl.Styles>
  <UserControl.Resources>
    <RecyclePool x:Key="RecyclePool" />
    <DataTemplate x:Key="odd" x:DataType="viewModels:ItemsRepeaterPageViewModelItem">
      <TextBlock Classes="oddTemplate"
                 Height="{Binding Height}"
                 Text="{Binding Text}"/>
    </DataTemplate>
    <DataTemplate x:Key="even" x:DataType="viewModels:ItemsRepeaterPageViewModelItem">
      <TextBlock Classes="evenTemplate"
                 Height="{Binding Height}"
                 Text="{Binding Text}"/>
    </DataTemplate>
    <RecyclingElementFactory x:Key="elementFactory"
                             RecyclePool="{StaticResource RecyclePool}"
                             SelectTemplateKey="OnSelectTemplateKey">
      <RecyclingElementFactory.Templates>
        <StaticResource x:Key="odd" ResourceKey="odd" />
        <StaticResource x:Key="even" ResourceKey="even" />
      </RecyclingElementFactory.Templates>
    </RecyclingElementFactory>
  </UserControl.Resources>
  
  <DockPanel>
    <StackPanel DockPanel.Dock="Top" Spacing="4" Margin="0 0 0 16">
      <TextBlock Classes="h2">A data-driven collection control that incorporates a flexible layout system, custom views, and virtualization.</TextBlock>
    </StackPanel>
    <StackPanel DockPanel.Dock="Right" Margin="8 0" Spacing="4">
      <ComboBox SelectedIndex="0" SelectionChanged="LayoutChanged">
        <ComboBoxItem>Stack - Vertical</ComboBoxItem>
        <ComboBoxItem>Stack - Horizontal</ComboBoxItem>
        <ComboBoxItem>UniformGrid - Vertical</ComboBoxItem>
        <ComboBoxItem>UniformGrid - Horizontal</ComboBoxItem>
      </ComboBox>
      <Button Command="{Binding AddItem}">Add Item</Button>
      <Button Command="{Binding RemoveItem}">Remove Item</Button>
      <Button Command="{Binding RandomizeHeights}">Randomize Heights</Button>
      <Button Command="{Binding ResetItems}">Reset items</Button>
      <Button x:Name="scrollToLast">Scroll to Last</Button>
      <Button x:Name="scrollToRandom">Scroll to Random</Button>
      <Button x:Name="scrollToSelected">Scroll to Selected</Button>
    </StackPanel>
    <Border BorderThickness="1" BorderBrush="{DynamicResource CatalogBaseMediumColor}" Margin="0 0 0 16">
      <ScrollViewer Name="scroller"
                    HorizontalScrollBarVisibility="Auto"
                    VerticalScrollBarVisibility="Auto">
        <ItemsRepeater Name="repeater" Background="Transparent" ItemsSource="{Binding Items}"
                       ItemTemplate="{StaticResource elementFactory}"/>
      </ScrollViewer>
    </Border>
  </DockPanel>
</UserControl>