CupertinoFullscreenDialogTransition constructor

  1. {Key? key,
  2. required Animation<double> primaryRouteAnimation,
  3. required Animation<double> secondaryRouteAnimation,
  4. required Widget child,
  5. required bool linearTransition}

Creates an iOS-style transition used for summoning fullscreen dialogs.

  • primaryRouteAnimation is a linear route animation from 0.0 to 1.0 when this screen is being pushed.
  • secondaryRouteAnimation is a linear route animation from 0.0 to 1.0 when another screen is being pushed on top of this one.
  • linearTransition is whether to perform the secondary transition linearly. Used to precisely track back gesture drags.


  required Animation<double> primaryRouteAnimation,
  required Animation<double> secondaryRouteAnimation,
  required this.child,
  required bool linearTransition,
}) : _positionAnimation = CurvedAnimation(
       parent: primaryRouteAnimation,
       curve: Curves.linearToEaseOut,
       // The curve must be flipped so that the reverse animation doesn't play
       // an ease-in curve, which iOS does not use.
       reverseCurve: Curves.linearToEaseOut.flipped,
     _secondaryPositionAnimation =
           ? secondaryRouteAnimation
           : CurvedAnimation(
               parent: secondaryRouteAnimation,
               curve: Curves.linearToEaseOut,
               reverseCurve: Curves.easeInToLinear,