[英]How to tell whether item in itemscontrol datatemplate is current?
I have an ItemsControl that binds to ICollectionView. 我有一个绑定到ICollectionView的ItemsControl。
I need to tell from withing DataTemplate of an item, whether it is the current. 我需要从关闭项目的DataTemplate来判断它是否是当前的。
Note: This is possible from Listbox, but I want ItemsControl looks. 注意:这可以从列表框中进行,但是我希望ItemsControl看起来像。
I would do it with a MultiValueConverter which compares the data-templated item with the CurrentItem in the view, eg 我会用一个MultiValueConverter来做到这一点,它将数据模板化的项目与视图中的CurrentItem进行比较,例如
<local:EqualityComparisonConverter x:Key="EqualityComparisonConverter"/>
<DataTemplate DataType="{x:Type local:Employee}">
<StackPanel Orientation="Horizontal">
<CheckBox IsEnabled="False">
<CheckBox.IsChecked>
<MultiBinding Converter="{StaticResource EqualityComparisonConverter}" Mode="OneWay">
<Binding RelativeSource="{RelativeSource AncestorType=ItemsControl}"
Path="ItemsSource.CurrentItem"/>
<Binding />
</MultiBinding>
</CheckBox.IsChecked>
</CheckBox>
...
The converter: 转换器:
public class EqualityComparisonConverter : IMultiValueConverter
{
#region IMultiValueConverter Members
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
if (values.Length < 2) throw new Exception("At least two inputs are needed for comparison");
bool output = values.Aggregate(true, (acc, x) => acc && x.Equals(values[0]));
return output;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
#endregion
}
Make sure to actually change the current item in some way or it is quite pointless. 确保以某种方式实际更改当前项目,否则将毫无意义。 Also the ItemsSource
of the ItemsControl
obviously needs to be a ICollectionView but you said that is the case anyway. 另外, ItemsControl
的ItemsSource
显然需要为ICollectionView,但是无论如何,您都说是这样。
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