How to make RightToLeftLayout work for controls inside GroupBoxes and Panels?

Question

According to MSDN

form.RightToLeftLayout = True;
form.RightToLeft = ifWeWantRTL() ? RightToLeft.True : RightToLeft.False;

is enough to mir

Answer 1

If you have a class derived from Control that contains child controls (like a ContainerControl), you can add the following code to force all child controls to mirror when the parent form's RightToLeftLayout is set to true and when your control's RightToLeft is set to RightToLeft.Yes.

protected override CreateParams CreateParams
{
    get
    {
        CreateParams createParams = base.CreateParams;
        Form parent = this.FindForm();
        bool parentRightToLeftLayout = parent != null ? parent.RightToLeftLayout : false;
        if ((this.RightToLeft == RightToLeft.Yes) && parentRightToLeftLayout)
        {
            createParams.ExStyle |= 0x500000; // WS_EX_LAYOUTRTL | WS_EX_NOINHERITLAYOUT
            createParams.ExStyle &= ~0x7000; // WS_EX_RIGHT | WS_EX_RTLREADING | WS_EX_LEFTSCROLLBAR
        }
        return createParams;
    }
}

protected override void OnRightToLeftChanged(EventArgs e)
{
    base.OnRightToLeftChanged(e);
    RecreateHandle();
}