Is there a way to configure the WPF ListBox such that it's not possible to deselect/unselect an item? So there is always an item selected?
My ListBox binds to an ObservableCollection<MyClass>.
-
You can disable you ListBox, after an item was selected.IVerzin– IVerzin2011-04-28 09:33:24 +00:00Commented Apr 28, 2011 at 9:33
Add a comment
|
2 Answers
You can handle the SelectionChanged event and set a selection if the SelectedItem evaluates to null. To reselect an item that has been unselected you can keep track of the last selected item in a private field, which should always be updated in the SelectionChanged event.
2 Comments
Robbert Dam
Maybe not the most elegant solution, but it worked for me, thanks!
Matt
In the SelectionChanged you have RemovedItems in SelectionChangedEventArgs. So you don't need to keep track of last selected item and it works also for multi selection listboxes.
Sound more like a RadioButtonGroup.You can customize the ItemContainerStyle of listbox and easily have this behavior in your listboxes.See below
<Style TargetType="{x:Type RadioButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type RadioButton}">
<Border
Name="Border"
Padding="2"
SnapsToDevicePixels="true">
<Grid
VerticalAlignment="Center">
<ContentPresenter x:Name="contentPresenter"
TextBlock.FontWeight="Bold"
TextBlock.Foreground="{TemplateBinding Foreground}"
TextBlock.FontSize="10"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch" />
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="true">
<Setter TargetName="Border" Property="Background"
Value="{StaticResource SelectedBackgroundBrush}"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground"
Value="{StaticResource DisabledForegroundBrush}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<ObjectDataProvider x:Key="WindowStyles" MethodName="GetValues"
ObjectType="{x:Type sys:Enum}" >
<ObjectDataProvider.MethodParameters>
<x:Type TypeName="WindowStyle" />
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
<Style x:Key="RadioButtonList" TargetType="{x:Type ListBox}">
<Setter Property="BorderBrush" Value="{x:Null}" />
<Setter Property="BorderThickness" Value="0" />
<Setter Property="ItemContainerStyle">
<Setter.Value>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="Margin" Value="6,2" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border Background="Transparent">
<RadioButton Focusable="False"
IsHitTestVisible="False"
IsChecked="{TemplateBinding IsSelected}">
<ContentPresenter />
</RadioButton>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<StackPanel Margin="10">
<TextBlock FontWeight="Bold">WindowStyle:</TextBlock>
<ListBox Name="WindowStyleSelector" SelectedIndex="1" Margin="10,0,0,0"
Style="{StaticResource RadioButtonList}" Tag="Horizontal"
ItemsSource="{Binding Source={StaticResource WindowStyles}}" />
</StackPanel>
</Grid>
Check the below link for more
http://drwpf.com/blog/2009/05/12/itemscontrol-l-is-for-lookless/
