从另一个类C＃重写KeyDown

Question

I have a form that creates a class. This class processes events that are fired on the form. The problem is I am trying to use the KeyDown event, but it isn't working because there are buttons on the form and they are capturing the KeyDown. I found the solution on another post was to override the ProcessCmdKey. The problem is I don't know how to override a method from inside another class. Can anyone tell me how I can capture all KeyDown events from inside my other class?

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    if (keyData == Keys.Left)
    {
        MoveLeft(); DrawGame(); DoWhatever();
        return true; //for the active control to see the keypress, return false
    }
    else if (keyData == Keys.Right)
    {
        MoveRight(); DrawGame(); DoWhatever();
        return true; //for the active control to see the keypress, return false
    }
    else if (keyData == Keys.Up)
    {
        MoveUp(); DrawGame(); DoWhatever();
        return true; //for the active control to see the keypress, return false
    }
    else if (keyData == Keys.Down)
    {
        MoveDown(); DrawGame(); DoWhatever();
        return true; //for the active control to see the keypress, return false
    }
    else
        return base.ProcessCmdKey(ref msg, keyData);
}

Answer 1

The easiest way to do this would be to expose the KeyDown from Button on the containing form.

class MyForm : Form { 
  Button m_button;

  public event KeyEventHandler ButtonKeyDown;

  public MyForm() { 
    m_button = ...;
    m_button.KeyDown += delegate (object, e) {
      KeyEventHandler saved = ButtonKeyDown;
      if (saved != null) { 
         saved(object, e);
      }
    };
  }
}

Now the calling code can simple hook into the MyForm::ButtonKeyDown event

Answer 2

I'm not sure how you're wiring up the events with your class, but if you set the KeyPreview property of the form to True, you can grab a hold of the event there and then pass it along to your class that is processing the events. So even when the button has the focus, the KeyDown will fire the event on the form.

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    ... Invoke your class
}