Can I apply a WPF style to an element only in a certain layout?

Question

I have a TextBlock style like this:

<Style TargetType="TextBlock" x:Key="FormLabel">
    <Setter Property="Height" Value="20" />
    <Setter Property="Margin" Value="10" />
    <Setter Property="TextAlignment" Value="Right" />
    <Setter Property="VerticalAlignment" Value="Center" />
</Style>

I use it in Grid based forms, e.g:

<TextBlock Text="Code" Grid.Row="1" Grid.Column="0" Style="{StaticResource FormLabel}" />

Now instead of repeating the style name on every TextBlock in the grid, I would prefer to e.g. have a Grid style like:

<Style TargetType="Grid" x:Key="FormGrid">
    <Setter Property="Width" Value="400" />
    ...
</Style>

Then I would, if possible, like to modify my TextBlock style to only apply to that element when it is a child element of a Grid with style FormGrid.

Is this possible, and if so, how can I achieve it?

Answer 1

This is indeed possible by using an implicit style within another style as a resource. Take this example:

...
<Window.Resources>
    <Style x:Key="FormGrid" TargetType="Grid">
        <Style.Resources>
            <Style TargetType="TextBlock">
                <Setter Property="Height" Value="20" />
                <Setter Property="Margin" Value="10" />
                <Setter Property="TextAlignment" Value="Right" />
                <Setter Property="VerticalAlignment" Value="Center" />
            </Style>
        </Style.Resources>
        <Setter Property="Width" Value="400" />
    </Style>
</Window.Resources>
<StackPanel>
    <Grid Style="{StaticResource FormGrid}">
        <TextBlock Text="This text block is styled with FormGrid TextBlock implicit style."/>
    </Grid>        
    <TextBlock Text="This text block uses the default style."/>
</StackPanel>
...