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Animate Page Route Transitions in Flutter

Introduction

Flutter provides a comprehensive animation system that enables developers to create visually appealing and engaging user interfaces. One of the commonly used animation techniques is page route transitions, which animate the screen as it changes from one page to another.

Customizing Page Route Transitions

The built-in Navigator widget in Flutter provides support for basic page route transitions, such as slides and fades. However, for more complex transitions, you can create your own custom transitions using the Tween and Curve objects. The Tween object allows you to interpolate between two values, while the Curve object defines the easing function for the animation. By combining these two objects, you can create customized transitions that precisely control the animation's behavior.

In this example, we'll use the Tween and Curve objects to create a custom transition that animates the page route by fading and scaling simultaneously.

“` import 'package:flutter/material.dart'; class CustomRouteTransitionBuilder extends PageTransitionsBuilder { const CustomRouteTransitionBuilder(); @override Widget buildTransitions( PageRoute route, BuildContext context, Animation animation, Animation secondaryAnimation, Widget child) { final tween = Tween(begin: 0.0, end: 1.0); final curve = Curves.easeInOut; return FadeTransition( opacity: tween.animate(CurvedAnimation(parent: animation, curve: curve)), child: ScaleTransition( scale: tween.animate(CurvedAnimation(parent: animation, curve: curve)), child: child, ), ); } } “`

This custom transition can then be applied to any Navigator push or pop operation using the transitionBuilder parameter.

“` Navigator.push( context, MaterialPageRoute( builder: (context) => SecondPage(), transitionBuilder: CustomRouteTransitionBuilder(), ), ); “`

Conclusion

By leveraging the built-in animation capabilities of Flutter, you can create custom page route transitions that enhance the user experience and add a touch of visual appeal to your applications. Whether it's a simple fade or a complex combination of animations, the possibilities are endless with Flutter's flexible and extensible animation system.