CODEWITHSUNDEEP
c#wpfxamllistbox
Markus A.
Markus A.

Reputation: 41

WPF ListBox.UnselectAll() doesn't clear visual state

I'm trying to build a ListBox which allows the user to unselect the item.

This is my XAML code:

<ListBox Name="MyListBox"
                ItemsSource="{Binding MoeglicheHauptspeisen}"
                SelectionMode="Single">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Horizontal" />
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Width="200"
                                Height="200"
                                Background="{StaticResource Braun}"
                                MouseDown="Speise_Gedrueckt">
                        <TextBlock Margin="0 50 0 0"
                                   HorizontalAlignment="Center"
                                   Text="{Binding SpeiseTyp}" />
                        <TextBlock HorizontalAlignment="Center" Text="{Binding Beschreibung}" />
                        <TextBlock HorizontalAlignment="Center" Text="{Binding Preis, StringFormat={}{0:C}}" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

And my code-behind:

private void Speise_Gedrueckt(object sender, MouseButtonEventArgs e)
    {
       MyListBox.UnselectAll();
    }

I can unselect the item by clicking on it again, it does set SelectedIndex to -1 etc., but it doesn't clear the border that the selected item has in the ListBox itself.

I did google a lot but nothing I found did change that fact. I tried to set the border/background of the item which is selected via a style.setter, but it also didn't help.

Upvotes: 0

Views: 603

Answers (2)

brugi82
brugi82

Reputation: 36

Pay attention that Listbox item has 3 visual states - Selected, Not selected, and Focused. Even if you deselect Listbox item through code-behind, keyboard focus will still be there (assuming that you selected it by clicking on it). That's why some kind of visual indicator will be shown.

Upvotes: 1

Rom
Rom

Reputation: 1193

Not sure when do you want to clear the selected item so I added a button with the EventHandler:

   <Button Width="100" Height="40" Click="Speise_Gedrueckt"></Button>

Now set the SelectedItem to null when the button is clicked:

 private void Speise_Gedrueckt(object sender, RoutedEventArgs routedEventArgs)
 {
        MyListBox.SelectedItem = null;
 }

Upvotes: 0

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