WPF: how do i handle a click on a ListBox item?

Question

In my WPF app I'm handling a ListBox SelectionChanged event and it runs fine.

Now I need to handle a click event (even for the already selected item); I've tried MouseDown but it does not work. How can I handle a ListBox click on an item?

This is answered here: http://stackoverflow.com/a/821609/58768 — bohdan_trotsenko, May 15 '13 at 12:18
@modosansreves that question asks about Click. Click is special. Apparently hijacked and turned into SelectionChanged. DoubleClick is not... — Nate Anderson, Apr 14 '15 at 20:01
Here is a similar question; whose answer is a nice summary of all approaches. http://stackoverflow.com/q/1271375/1175496 — Nate Anderson, Apr 14 '15 at 20:12

score 37 · Answer 1 · answered Aug 04 '11 at 09:33

Just handle PreviewMouseDown event:

private void listBox_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
    var item = ItemsControl.ContainerFromElement(listBox, e.OriginalSource as DependencyObject) as ListBoxItem;
    if (item != null)
    {
        // ListBox item clicked - do some cool things here
    }
}

score 7 · Answer 2 · answered Aug 04 '11 at 09:32

7

Perhaps try the PreviewMouseDown event. The MouseDown event gets swallowed and converted to the SelectionChanged event.

Only downside is that the PreviewMouseDown will occur before the SelectionChanged.

answered Aug 04 '11 at 09:32

Arcturus

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score 4 · Answer 3 · answered Aug 04 '11 at 09:36

Listbox internally uses the mouse down to perform selection changed. So you can use preview mouse down event.

Apart from preview mouse down, you can use EventManager.RegisterClassHandler...

     EventManager.RegisterClassHandler(typeof(ListBoxItem), ListBoxItem.MouseLeftButtonDownEvent, new RoutedEventHandler(EventBasedMouseLeftButtonHandler));

     private static void EventBasedMouseLeftButtonHandler(object sender, RoutedEventArgs e)
     {
     }

Let me know if this helps...

WPF: how do i handle a click on a ListBox item?

3 Answers3

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