CupertinoPageTransition constructor

CupertinoPageTransition({ Key? key, required Animation<double> primaryRouteAnimation, required Animation<double> secondaryRouteAnimation, required Widget child, required bool linearTransition, })

Creates an iOS-style page transition.

• 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 transitions linearly. Used to precisely track back gesture drags.

Implementation

CupertinoPageTransition({
  super.key,
  required Animation<double> primaryRouteAnimation,
  required Animation<double> secondaryRouteAnimation,
  required this.child,
  required bool linearTransition,
})  : _primaryPositionAnimation = (linearTransition
              ? primaryRouteAnimation
              : CurvedAnimation(
                  // The curves below have been rigorously derived from plots of native
                  // iOS animation frames. Specifically, a video was taken of a page
                  // transition animation and the distance in each frame that the page
                  // moved was measured. A best fit bezier curve was the fitted to the
                  // point set, which is linearToEaseIn. Conversely, easeInToLinear is the
                  // reflection over the origin of linearToEaseIn.
                  parent: primaryRouteAnimation,
                  curve: Curves.linearToEaseOut,
                  reverseCurve: Curves.easeInToLinear,
                ))
          .drive(_kRightMiddleTween),
      _secondaryPositionAnimation = (linearTransition
              ? secondaryRouteAnimation
              : CurvedAnimation(
                  parent: secondaryRouteAnimation,
                  curve: Curves.linearToEaseOut,
                  reverseCurve: Curves.easeInToLinear,
                ))
          .drive(_kMiddleLeftTween),
      _primaryShadowAnimation = (linearTransition
              ? primaryRouteAnimation
              : CurvedAnimation(
                  parent: primaryRouteAnimation,
                  curve: Curves.linearToEaseOut,
                ))
          .drive(_CupertinoEdgeShadowDecoration.tween(linearTransition));