How do you bind the TextWrapping property of a TextBox to the IsChecked value of a MenuItem?

Question

The TextWrapping property of the TextBox has three possible values:

• Wrap
• NoWrap
• WrapWithOverflow

I would like to bind to the IsChecked property of a MenuItem. If the MenuItem is checked, I want to set the TextWrapping property of a TextBox to Wrap. If the MenuItem is not checked, I want to set the TextWrapping property of the TextBox to NoWrap.

To sum up, I am trying to bind a control that has two states to two values of an enumeration that has more than two values.

[edit] I would like to accomplish this in XAML, if possible.

[edit] I figured out how to do this using an IValueConverter. Perhaps there is a better way to do this? Here is what I did:

---

In Window.Resources, I declared a reference to my ValueConverter.

<local:Boolean2TextWrapping x:Key="Boolean2TextWrapping" />

In my TextBox, I created the binding to a MenuItem and included the Converter in the binding statement.

TextWrapping="{Binding ElementName=MenuItemWordWrap, Path=IsChecked, Converter={StaticResource Boolean2TextWrapping}}"

and the ValueConverter looks like this:

public class Boolean2TextWrapping : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo cultureInfo)
        {
            if (((bool)value) == false)
            {
                return TextWrapping.NoWrap;
            }
            return TextWrapping.Wrap;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

Answer 1

If you want to do this all in xaml you need to use a Style and a DataTrigger.

<StackPanel>
    <CheckBox x:Name="WordWrap">Word Wrap</CheckBox>
    <TextBlock Width="50">
        Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Proin lacinia nibh non augue. Pellentesque pretium neque et neque auctor adipiscing.

        <TextBlock.Style>
            <Style TargetType="{x:Type TextBlock}">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding IsChecked, ElementName=WordWrap}" Value="True">
                        <Setter Property="TextWrapping" Value="Wrap" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </TextBlock.Style>
    </TextBlock>
</StackPanel>