title: How to add Signature in flutter?
body: <p>I have implemented <a href="https://github.com/kiwi-bop/flutter_signature_pad" rel="nofollow noreferrer">signature_pad</a> in my flutter project and it works fine.</p>
  <p>Unfortunately when I place it inside <code>SingleChildScrollView</code>, the signature was not drawn. It scrolled instead of signed.</p>
  <p>It seems like is the <code>GestureDetector</code> but I have no idea how to fix it.</p>
  <p>Can someone give me some clue on this?</p>
  <p>Thanks.</p>