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();
}
}
您想要在xaml中执行此操作,您需要使用和。 p>
< StackPanel>
< CheckBox x:Name =WordWrap> Word Wrap< / CheckBox>
< TextBlock Width =50>
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< 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();
}
}
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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