TextBlock style triggers

datatrigger, mvvm, styles, wpf, xaml

Solution

I would split it into two `TextBlocks` and only change the visibility using a trigger. By using the `Inlines` and trying to change the `Text` in the triggers you probably run into precedence problems and the `Inlines` cannot be extracted to a `Setter`.

e.g.

<StackPanel Grid.Column="2" Grid.Row="0" Orientation="Horizontal">
  <TextBlock Text="{Binding HonorificVm.DisplayName}" Margin="0,0,5,0">
    <TextBlock.Style>
      <Style TargetType="TextBlock">
        <Style.Triggers>
          <DataTrigger Binding="{Binding HonorificVm.Honorific}"
                       Value="{x:Static model:Honorific.NullHonorific}">
            <Setter Property="Visibility" Value="Collapsed" />
          </DataTrigger>
        </Style.Triggers>
      </Style>
    </TextBlock.Style>
  </TextBlock>
  <TextBlock Text="{Binding PersonNameVm.DisplayName}" />
</StackPanel>

An alternative would be a `MultiBinding` instead of `Inlines`:

<TextBlock Grid.Column="2" Grid.Row="0">
  <TextBlock.Style>
    <Style TargetType="{x:Type TextBlock}">
      <Setter Property="Text">
        <Setter.Value>
          <MultiBinding StringFormat="{}{0} {1}">
            <Binding Path="HonorificVm.DisplayName" />
            <Binding Path="PersonNameVm.DisplayName" />
          </MultiBinding>
        </Setter.Value>
      </Setter>
      <Style.Triggers>
        <DataTrigger Binding="{Binding HonorificVm.Honorific}"
                     Value="{x:Static model:Honorific.NullHonorific}">
          <Setter Property="Text" Value="{Binding PersonNameVm.DisplayName}" />
        </DataTrigger>
      </Style.Triggers>
    </Style>
  </TextBlock.Style>
</TextBlock>

Problem

Original source