title: How can I drag a widget not directly but through slider widget in flutter
body: <p>I want to add a dragging effect on a particular widget using slider.
  <a href="https://i.stack.imgur.com/XKRWw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XKRWw.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/Jv2wp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Jv2wp.png" alt="enter image description here" /></a></p>