Double Click a ListBox item to open a browser

Question

I have a ListBox in my wpf window that binds to an ObervableCollection. I want to open the browser if someone clicks on an element of the Li

Answer 1

Here's a behavior that gets that done on both ListBox and ListView. This is based of answers from Andrew S. and Vadim Tofan, great job guys!

public class ItemDoubleClickBehavior : Behavior
{
    #region Properties
    MouseButtonEventHandler Handler;
    #endregion

    #region Methods

    protected override void OnAttached()
    {
        base.OnAttached();

        AssociatedObject.PreviewMouseDoubleClick += Handler = (s, e) =>
        {
            e.Handled = true;
            if (!(e.OriginalSource is DependencyObject source)) return;

            ListBoxItem sourceItem = source is ListBoxItem ? (ListBoxItem)source : 
                source.FindParent();

            if (sourceItem == null) return;

            foreach (var binding in AssociatedObject.InputBindings.OfType())
            {
                if (binding.MouseAction != MouseAction.LeftDoubleClick) continue;

                ICommand command = binding.Command;
                object parameter = binding.CommandParameter;

                if (command.CanExecute(parameter))
                    command.Execute(parameter);
            }
        };
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();
        AssociatedObject.PreviewMouseDoubleClick -= Handler;
    }

    #endregion
}

Here's the extension class used to find the parent.

public static class UIHelper
{
    public static T FindParent(this DependencyObject child, bool debug = false) where T : DependencyObject
    {
        DependencyObject parentObject = VisualTreeHelper.GetParent(child);

        //we've reached the end of the tree
        if (parentObject == null) return null;

        //check if the parent matches the type we're looking for
        if (parentObject is T parent)
            return parent;
        else
            return FindParent(parentObject);
    }
}

Usage:

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
xmlns:coreBehaviors="{{Your Behavior Namespace}}"