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

The PreviewKeyDown event exists exactly for this sort of thing.

private void spacebarHandler_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Space)
        e.Handled = true;
}

Your KeyDown handler will never receive the KeyDown event for spacebar.