How to capture a mouse click on an Item in a ListBox in WPF?

by

I believe that your MouseLeftButtonDown handler is not called because the ListBox uses this event internally to fire its SelectionChanged event (with the thought being that in the vast majority of cases, SelectionChanged is all you need). That said, you have a couple of options.

First, you could subscribe to the PreviewLeftButtonDown event instead. Most routed events have a routing strategy of Bubbling, which means that the control that generated the event gets it first, and if not handled, the event works its way up the visual tree giving each control a chance at handling the event. The Preview events, on the other hand, are Tunneling. This means that they start at the root of the visual tree (generally Window), and work their way down to the control that generated the event. Since your code would get the chance to handle the event prior to the ListBoxItem, this will get fired (and not be handled) so your event handler will be called. You can implement this option by replacing MouseDoubleClickEvent in your sample with PreviewMouseLeftButtonDown.

The other option is to register a class handler that will be notified whenever a ListBoxItem fires the MouseLeftButtonDown event. That is done like this:

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

private void OnMouseLeftButtonDown(object sender, RoutedEventArgs e)
{
}

Class Handlers are called before any other event handlers, but they’re called for all controls of the specified type in your entire application. So if you have two ListBoxes, then whenever any ListBoxItem is clicked in either of them, this event handler will be called.

As for your second question, the best way to know what type of event handler you need for a given event, and to see the list of events available to a given control, is to use the MSDN documentation. For example, the list of all events handled by ListBoxItem is at http://msdn.microsoft.com/en-us/library/system.windows.controls.listboxitem_events.aspx. If you click on the link for an event, it includes the type of the event handler for that event.

More Related Contents:

  1. Select ListBoxItem if TextBox in ItemTemplate gets focus
  2. WPF calling commands via events
  3. ItemContainerGenerator.ContainerFromItem() returns null?
  4. What are WPF Preview Events?
  5. How to disable highlighting on listbox but keep selection?
  6. What does it mean to “Capture the mouse” in WPF?
  7. How do I make a WPF data template fill the entire width of the listbox?
  8. Is there Selected Tab Changed Event in the standard WPF Tab Control
  9. How can I Have a WPF EventTrigger on a View trigger when the underlying Viewmodel dictates it should?
  10. Clicking HyperLinks in a RichTextBox without holding down CTRL – WPF
  11. What is the best way to simulate a Click with MouseUp & MouseDown events or otherwise?
  12. WPF Change button background image when clicked
  13. WPF ListBox with a ListBox – UI Virtualization and Scrolling
  14. WPF: Remove dotted border around focused item in styled listbox
  15. How can I have a ListBox auto-scroll when a new item is added?
  16. How to create user define (new) event for user control in WPF ?one small example
  17. How can I sort a ListBox using only XAML and no code-behind?
  18. How can I implement fading in and out of Added/Removed ListItems
  19. WPF Events in ResourceDictionary for a ControlTemplate
  20. WPF MouseLeftButtonUp Not Firing
  21. Force TextBlock to wrap in WPF ListBox
  22. WPF datagrid selected row clicked event ?
  23. Child elements of scrollviewer preventing scrolling with mouse wheel?
  24. How to disable a databound ListBox item based on a property value?
  25. RoutedEventArgs.Source vs Sender
  26. Calling a parameterized constructor from XAML
  27. Weird problem where Button does not get re-enabled unless the mouse is clicked
  28. Different views / data template based on member variable
  29. Binding to DateTime.Now. Update the value
  30. WPF: Changing Resources (colors) from the App.xaml during runtime

Leave a Comment