How to set DataContext of elements based on datacontext of ContentControl on same UserControl

Question

Following is the section from My Shell:

        <StackPanel x:Name="stack" Orientation="Horizontal" Height="25" HorizontalAlignment="Right" Margin="0,4,0,0" Grid.Row="0">
            <Button DataContext="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type StackPanel}}, Path=DataContext}" Content="Back" prism:Click.Command="{Binding Path=GoBackCommand}"/>
            <Button DataContext="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type StackPanel}}, Path=DataContext}" Content="Forward" prism:Click.Command="{Binding Path=GoForwardCommand}"  Margin="10,0,0,0"/>
        </StackPanel>


        <ContentControl x:Name="ActionContent" prism:RegionManager.RegionName="{x:Static inf:RegionNames.WorkspaceRegion}" Grid.Row="1">
            <ContentControl.Template>
            <ControlTemplate TargetType="ContentControl" >                        
                        <Grid >
                        <Controls:RoundedBox/>                 
                        <ContentPresenter Margin="10,0,10,0" Content="{TemplateBinding Content}" />                          
                        </Grid>                       

                    <ControlTemplate.Triggers>
                    <Trigger Property="HasContent" Value="false">
                        <Setter Property="Visibility" Value="Collapsed" />
                    </Trigger>

                    <DataTrigger Binding="{Binding ElementName=stack}">
                            <Setter Property="DataContext" Value="{Binding RelativeSource={RelativeSource Self}, 
                            Path=Content.DataContext}" />
                        </DataTrigger>

                    </ControlTemplate.Triggers>

            </ControlTemplate>
        </ContentControl.Template>

In ContentControl views are injecting from Modules (using ribbon tab). I want two button inside StackPanel may use ViewModels (DataContext) of injected views, for backward and Forward navigation.

Please Help, thanks!

Answer 1

I would start by having a good read at Prism Navigation Chapter,

and how to use the navigation journal.

Edit: I don't think you can do what you want directly in XAML, but i can see 2 workarounds:

• Define the commands as global CompositeCommand in the shell viewmodel, then have your views reister and unregister their own implementations as they are navigated.
• Define a new Region in wich the views can inject their own navigation buttons.

Hope this can help you.