WPF: OnKeyDown() not being called for space key in control derived from WPF TextBox

Question

In a WPF application, I have a control that I have derived from TextBox like this:

public class SelectableTextBlock : TextBox
{
    protected override void O         


        

Answer 1

It seems the problem is that the space (and backspace etc.) key down event is being handled already within the TextBox, before it bubbles up to my derived control. I assume as part of the text composition process, as Wim posted.

To workaround this, I've added a handler that will receive the key down event even it has already been handled, and sets its Handled member to false, to allow it to carry on bubbling up normally. In the example below it just does this for space keys, but in my case I'll need to make it do this for any key events that I really don't want handled in my SelectedableTextBlock, as I don't know what key events parents might be interested in yet.

public class SelectableTextBlock : TextBox
{
    public SelectableTextBlock() : base()
    {
        this.AddHandler(SelectableTextBlock.KeyDownEvent, new RoutedEventHandler(HandleHandledKeyDown), true);
    }

    public void HandleHandledKeyDown(object sender, RoutedEventArgs e)
    {
        KeyEventArgs ke = e as KeyEventArgs;
        if (ke.Key == Key.Space)
        {
            ke.Handled = false;
        }
    }
    ...
}

I am of course still interested if anyone has a better solution...

Thanks, E.