How can I position ViewModels in an ItemsControl

Question

My mainwindow ViewModel has an ObservableCollection of ViewModels, called ViewModels.

The Mainwindow XAML has an ItemsControl with ItemsSource bound to ViewModels.

Answer 1

Make your ItemsControl.ItemsPanel into a Canvas, and set your Top/Left/Height/Width in the ItemTemplate.

<ItemsControl ItemsSource="{Binding ViewModels}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <!-- Height, Width, and Background are required to render size correctly -->
            <Canvas Height="600" Width="800" Background="White" />
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>

    <ItemsControl.ItemContainerStyle>
        <Style TargetType="{x:Type FrameworkElement}">
            <Setter Property="Canvas.Top" Value="{Binding Top}" />
            <Setter Property="Canvas.Left" Value="{Binding Left}" />
            <Setter Property="Height" Value="{Binding Height}" />
            <Setter Property="Width" Value="{Binding Width}" />
        </Style>
    </ItemsControl.ItemContainerStyle>

    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <ContentControl>
                <ContentPresenter ClipToBounds="True" Content="{TemplateBinding Content}"/>
            </ContentControl>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>