title: OnPressed Set activeColor to a button of a list, and set inactiveColor to others btns - Flutter
body: <p>I have a list of Chips, and I want them to change color when user click on them.</p>
  
  <p>For instance if I click on the first Chip its color become black, and every other chips are grey. Then if I click on the second Chip its color become black and first Chip color become grey and so on.</p>
  
  <p>I can't find a beautiful/simple way to do this, have you any ideas ?</p>
  
  <p>Thanks a lot</p>