Question

I have a control. It’s a text box. I want to draw an image at the left of the control. The image should be painted outside the control. I could paint it one but inside.

Here is the code:

  private static Image requiredIcon = Resources.Icon_required;
  protected override void OnPaint(PaintEventArgs e)
  {
     base.OnPaint(e);
     if (base.Enabled && string.IsNullOrEmpty(base.Text))
     {
        e.Graphics.DrawImage(requiredIcon, 0, 0);
     }
  }

Answer 1

I can get a parent and use it for painting.

  protected override void OnParentChanged(EventArgs e)
  {
     base.OnParentChanged(e);
     base.Parent.Paint += new PaintEventHandler(Parent_Paint);
  }

  private void Parent_Paint(object sender, PaintEventArgs e)
  {
    if (base.Enabled && string.IsNullOrEmpty(base.Text))
    {
       e.Graphics.DrawImage(requiredIcon, 0, 0);
    }
  }