CODEWITHSUNDEEP
c#winforms
Chamkey
Chamkey

Reputation: 105

Prevent Arrow Keys from changing focus while still allowing functionality of the keys

I have the following code in my project which disables arrow keys completely:

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    if (!msg.HWnd.Equals(Handle) &&
        (keyData == Keys.Left || keyData == Keys.Right ||
         keyData == Keys.Up || keyData == Keys.Down))
        return true;

    if (keyData == Keys.Escape)
    {
        this.Close();
        return true;
    }

    return base.ProcessCmdKey(ref msg, keyData);
}

I also have this code after it which I need in order to make it such that the up arrow key counts up.

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Up)
    {
        int count;

        if (count_lbl.Text.Equals(""))
            count = 0;

        else
            count = Convert.ToInt32(count_lbl.Text);

        count++;
        count_lbl.Text = count.ToString();
    }
}

I don't want the arrow keys to change focus to any control, other than the one I initialized my form to, but I still want to be able to use them later on in order to be able to do other things. Is there a way to do this?

Thanks.

Upvotes: 0

Views: 145

Answers (1)

Idle_Mind
Idle_Mind

Reputation: 39122

Just put the "counting" code in ProcessCmdKey()?

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    if (!msg.HWnd.Equals(Handle) &&
        (keyData == Keys.Left || keyData == Keys.Right ||
         keyData == Keys.Up || keyData == Keys.Down)) {
        if (keyData == Keys.Up) {
            int count;

            if (count_lbl.Text.Equals(""))
                count = 0;
            else
                count = Convert.ToInt32(count_lbl.Text);

            count++;
            count_lbl.Text = count.ToString();
        }
        return true;
    }

    if (keyData == Keys.Escape)
    {
        this.Close();
        return true;
    }

    return base.ProcessCmdKey(ref msg, keyData);
}

Upvotes: 1

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