Using of left/right keyboard button

Question

I'm trying to call function with left and right buttons on keyboard, but not sure how to do it proper way.

In result of this attempt, pressing on left/right keyboard keys just switches between GUI elements usual way, and does not works for given functions. Not sure what is wrong here:

   private void Form1_KeyDown(object sender, KeyEventArgs e)
   {
       if (e.KeyCode == Keys.Right)
       {
          func1();
       }
       else if (e.KeyCode == Keys.Left)
       {
          func2();
       }
   }

I guess that's because you not handling event. Does the breakpoint hits while debugging? I think [keyprieview property](https://msdn.microsoft.com/en-us/library/system.windows.forms.form.keypreview(v=vs.110).aspx) is what you looking for. — Renatas M., Apr 06 '17 at 12:11

score 2 · Accepted Answer · answered Apr 06 '17 at 12:23

2

An alternative to enabling keypreview as mentioned in some comments would be to override the ProcessCmdKey Method.

protected override bool ProcessCmdKey(ref Message msg, Keys keyData) 
{
    if (keyData == Keys.Right)
    {
      func1();
      return true;
    }
    else if (keyData == Keys.Left)
    {
      func2();
      return true;
    }
    return base.ProcessCmdKey(ref msg, keyData);
}

Please see this MSDN article for more information.

answered Apr 06 '17 at 12:23

Joshua Hysong

1,062
1
18
31

This seems to be the correct answer. Setting `KeyPreview` to `true` is not always enough, the `KeyDown` handler of the `Form` still won't be called if e.g. a `Button` has the focus. `ProcessCmdKey` always gets called. – René Vogt Apr 06 '17 at 12:28

score 1 · Answer 2 · edited May 23 '17 at 12:17

1

The code you have works correctly, you're just not allowed to press anything beforehand. I think you're looking for a general keydown as shown here

edited May 23 '17 at 12:17

Community

1
1

answered Apr 06 '17 at 12:20

Lotte Lemmens

551
5
11

Using of left/right keyboard button

2 Answers2