如何将TextBox的TextWrapping属性绑定到MenuItem的IsChecked值？ [英] How do you bind the TextWrapping property of a TextBox to the IsChecked value of a MenuItem?

问题描述

TextBox的TextWrapping属性有三个可能的值：

• Wrap


• NoWrap


• WrapWithOverflow

我想绑定到MenuItem的IsChecked属性。如果选中了MenuItem，我想将TextBox的TextWrapping属性设置为Wrap。如果没有选中MenuItem，我想将TextBox的TextWrapping属性设置为NoWrap。

总之，我试图绑定一个控件，它有两个状态

如果可能的话，我想在XAML中实现这一点。

[edit] 我想出了如何使用IValueConverter做到这一点。也许有更好的方法来做到这一点？这是我做的：

---

在Window.Resources中，我声明了一个对我的ValueConverter的引用。

 < local：Boolean2TextWrapping x：Key =Boolean2TextWrapping/> 
 

在我的TextBox中，我创建了一个对MenuItem的绑定，并在绑定语句中包含了Converter。 / p>



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

，ValueConverter看起来像这样：

  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（）; 
} 
} 
  




解决方案

您想要在xaml中执行此操作，您需要使用样式和 DataTrigger 。 p>



 < StackPanel> 
< CheckBox x：Name =WordWrap> Word Wrap< / CheckBox> 
< TextBlock Width =50> 
 Loreme 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 =TextWrappingValue =Wrap/> 
< / DataTrigger> 
< / Style.Triggers> 
< / Style> 
< /TextBlock.Style> 
< / TextBlock> 
< / StackPanel> 
  




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();
        }
    }

解决方案

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>

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