WPF ListView DoubleClick OriginalSource problem

Question

I attached an EventHandler to the MouseDoubleClick event.

<Style TargetType="ListViewItem" BasedOn="{StaticResource MyStyle}">                                
    <EventSetter Event="MouseDoubleClick" Handler="ListViewItem_MouseDoubleClick" />
</Style>

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

The ListView's View is based on the GridView, one of the column contains a CheckBox. I want to be able to ignore the double click if the CheckBox is double-clicked.

The problem is that I cannot find the original source (CheckBox) to block it, as with routing event I got the Theme as the original source, and with direct I got the ListViewItem.

Answer 1

You can use the VisualTreeHelper to find out if any ancestor of the OriginalSource is a CheckBox like this:

private void ListViewItem_MouseDoubleClick(object sender, RoutedEventArgs e)
{
    var obj = e.OriginalSource as DependencyObject;

    // suppress event?
    if (IsWithinCheckBox(obj))
        return;

    // handle your event here
}

private bool IsWithinCheckBox(DependencyObject obj)
{
    while (obj != null)
    {
        if (obj is CheckBox)
            return true;

        obj = VisualTreeHelper.GetParent(obj);
    }

    return false;
}