这就是我最终采取的方法。虽然我更愿意在DataGrid上使用属性,但由于没有这样的属性,我需要一个解决方法。
![alt文本](https://istack.dev59.com/7BOYV.webp)
首先,我只是从父DataGrid中使用ActualWidth,并删除了常量9。这起初很有效,但当垂直滚动条变为可见时,它失败了,所以我不得不使用MultiBinding。
<DataGrid.RowDetailsTemplate>
<DataTemplate>
<Border HorizontalAlignment="Left" CornerRadius="5"
BorderBrush="Red" BorderThickness="2" Background="Black">
<Border.Width>
<MultiBinding Converter=""
ConverterParameter="9">
<Binding RelativeSource="}"
Path="ActualWidth"/>
<Binding RelativeSource="}"
Path="ComputedVerticalScrollBarVisibility"/>
</MultiBinding>
</Border.Width>
<TextBlock Foreground="White" Text="" TextWrapping="Wrap"/>
</Border>
</DataTemplate>
</DataGrid.RowDetailsTemplate>
在转换器中,我使用了另一个常数(16)来补偿可见的垂直滚动条(如果它是可见的)。
public class RowDetailsWidthMultiConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
double originalWidth = (double)values[0];
Visibility verticalScrollbarVisibility = (Visibility)values[1];
double subtractWidth = System.Convert.ToDouble(parameter);
double returnWidth = originalWidth - subtractWidth;
if (verticalScrollbarVisibility == Visibility.Visible)
{
return returnWidth - 16;
}
return returnWidth;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
return null;
}
}
更新
我对解决方案进行了一些改进,使用ItemsPresenter的ActualWidth而不是DataGrid的ActualWidth(后者不会随着可见的滚动条改变而改变),从而消除了需要多个转换器和两个常量的需要。
<DataGrid.Resources>
<local:SubtractConstantConverter x:Key="SubtractConstantConverter"/>
</DataGrid.Resources>
<DataGrid.RowDetailsTemplate>
<DataTemplate>
<Border HorizontalAlignment="Left" CornerRadius="5"
BorderBrush="Red" BorderThickness="2" Background="Black"
Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type ItemsPresenter}},
Path=ActualWidth,
Converter={StaticResource SubtractConstantConverter},
ConverterParameter=6}">
<TextBlock Foreground="White" Text="{Binding RowDetails}" TextWrapping="Wrap"/>
</Border>
</DataTemplate>
</DataGrid.RowDetailsTemplate>
SubtractConstantConverter(减数常量转换器)
public class SubtractConstantConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
double originalValue = (double)value;
double subtractValue = System.Convert.ToDouble(parameter);
return originalValue - subtractValue;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return null;
}
}