Is it possible to template a template in WPF XAML? - wpf

Question

Is it possible to use templates within templates?
For instance, I have the following two templates:
<HierarchicalDataTemplate
x:Key="RecursiveTemplate"
ItemsSource="{Binding Children}">
<StackPanel Margin="1" Orientation="Horizontal">
<Ellipse Fill="DarkGreen" Width="14" Height="14"/>
<TextBlock
MouseDown="OnTreeMouseDown"
TargetUpdated="OnTargetUpdated"
Visibility="{Binding Editing, Converter={StaticResource visibilityInverter}}"
Margin="5"
Text="{Binding Name}"/>
<TextBox
PreviewKeyDown="OnTreeKeyDown"
Visibility="{Binding Editing, Converter={StaticResource visibilityConverter}}"
Margin="2"
Text="{Binding Name}"/>
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate
x:Key="ContainerTemplate"
ItemsSource="{Binding Children}">
<StackPanel Margin="1" Orientation="Horizontal">
<Ellipse Fill="DarkBlue" Width="14" Height="14"/>
<TextBlock
MouseDown="OnTreeMouseDown"
TargetUpdated="OnTargetUpdated"
Visibility="{Binding Editing, Converter={StaticResource visibilityInverter}}"
Margin="5"
Text="{Binding Name}"/>
<TextBox
PreviewKeyDown="OnTreeKeyDown"
Visibility="{Binding Editing, Converter={StaticResource visibilityConverter}}"
Margin="2"
Text="{Binding Name}"/>
</StackPanel>
</HierarchicalDataTemplate>
There's a section of identical XAML:
<TextBlock
MouseDown="OnTreeMouseDown"
TargetUpdated="OnTargetUpdated"
Visibility="{Binding Editing, Converter={StaticResource visibilityInverter}}"
Margin="5"
Text="{Binding Name}"/>
<TextBox
PreviewKeyDown="OnTreeKeyDown"
Visibility="{Binding Editing, Converter={StaticResource visibilityConverter}}"
Margin="2"
Text="{Binding Name}"/>
Is it possible to move that to a resource and refer to it by name, rather than repeat it?

Answer 1

The answer appears to be "almost"
<Style x:Key="textBlockStyle" TargetType="TextBlock">
<Setter Property="Visibility" Value="{Binding Editing, Converter={StaticResource visibilityInverter}}"/>
<Setter Property="Margin" Value="4"/>
<Setter Property="Text" Value="{Binding Name}"/>
<EventSetter Event="MouseDown" Handler="OnTreeMouseDown"/>
</Style>
<Style x:Key="textBoxStyle" TargetType="TextBox">
<Setter Property="Visibility" Value="{Binding Editing, Converter={StaticResource visibilityConverter}}"/>
<Setter Property="Margin" Value="1"/>
<Setter Property="Text" Value="{Binding Name, NotifyOnSourceUpdated=True}"/>
<EventSetter Event="PreviewKeyDown" Handler="OnTreeKeyDown"/>
</Style>
Then the templates reduce to
<HierarchicalDataTemplate
x:Key="RecursiveTemplate"
ItemsSource="{Binding Children}">
<StackPanel Margin="1" Orientation="Horizontal">
<Ellipse Fill="DarkGreen" Width="14" Height="14"/>
<TextBlock
Style="{StaticResource textBlockStyle}"/>
<TextBox
SourceUpdated="OnSourceUpdated"
Style="{StaticResource textBoxStyle}"/>
</StackPanel>
</HierarchicalDataTemplate>
However, note you cannot put SourceUpdated in a style, as it's not covered by EventSetter