_handleTabAnimation

main.dart

// runs during the switching tabs animation
_handleTabAnimation() {
  // gets the value of the animation. For example, if one is between the 1st and the 2nd tab, this value will be 0.5
  _aniValue = _controller.animation.value;

  // if the button wasn't pressed, which means the user is swiping, and the amount swipped is less than 1 (this means that we're swiping through neighbor Tab Views)
  if (!_buttonTap && ((_aniValue - _prevAniValue).abs() < 1)) {
    // set the current tab index
    _setCurrentIndex(_aniValue.round());
  }

  // save the previous Animation Value
  _prevAniValue = _aniValue;
}