Flutter - Rotate Transition - GeeksforGeeks

21 Jan, 2022
In Flutter, the page_transition package is used to create beautiful page transitions. It provides a wide range of effects that can be used from moving from one route to another. It is very convenient to use. In this article, we will explore the same by building a simple application.
To build a simple application depicting the use of page_transition package for a Rotate transition follow the below steps:
Add page_transition to the dependencies in pubspec.yaml file
Import the same dependency in the main.dart file
Use a StatelessWidget to give a structure to the application
Design the homepage
Define the onGenerateRoute property in the MaterialApp widget to transition to from the home page
Now, let’s look in the steps in detail:
You can add the page_transition dependency to the pubspec.yaml file as follows:
To import the dependency to your main.dart file use the following:
import 'package:page_transition/page_transition.dart';
The StatelessWidget can be used to give a simple structure to the application that contains an appbar and a body for the content as shown below:
Dart
class MyApp extends StatelessWidget {   @override  Widget build(BuildContext context) {    return MaterialApp(      debugShowCheckedModeBanner: false,      title: 'GeeksForGeeks',      theme: ThemeData(        primarySwatch: Colors.blue,      ),}
A StatelessWidget can also be used to design the Homepage for the app. A button will also be added to the homepage which will have a transition action attached to it when pressed as shown below:
Dart
class MyHomePage extends StatelessWidget {  @override  Widget build(BuildContext context) {    return Scaffold(      backgroundColor: Colors.greenAccent,      appBar: AppBar(        title: Text('GeeksForGeeks'),        backgroundColor: Colors.green,      ),      body: Center(        child: Column(          mainAxisAlignment: MainAxisAlignment.center,          crossAxisAlignment: CrossAxisAlignment.center,          children: <Widget>[            RaisedButton(              child: Text('Rotate Transition Button'),              onPressed: () {                Navigator.push(                  context,                  PageTransition(                    curve: Curves.bounceOut,                    type: PageTransitionType.rotate,                    alignment: Alignment.topCenter,                    child: SecondPage(),                  ),                );              },            ),          ],        ),      ),    );  }}
  
 
The onRouteSettings property is used to extract information from one page and send it to another page (or, route). We will assign the same property to the button action that we added in the homepage that will transition it to the second page as shown below:
 
Dart
onGenerateRoute: (settings) {        switch (settings.name) {          case '/second':            return PageTransition(              child: SecondPage(              ),              type: PageTransitionType.fade,              settings: settings,            );
  
Complete Source Code:
 
Dart
import 'package:flutter/material.dart';import 'package:page_transition/page_transition.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget {  // root of application  @override  Widget build(BuildContext context) {    return MaterialApp(      debugShowCheckedModeBanner: false,      title: 'GeeksForGeeks',      theme: ThemeData(        primarySwatch: Colors.blue,      ),      home: MyHomePage(),      onGenerateRoute: (settings) {        switch (settings.name) {          case '/second':            return PageTransition(              child: SecondPage(              ),              type: PageTransitionType.fade,              settings: settings,            );            break;          default:            return null;        }      },    );  }} /// Homepageclass MyHomePage extends StatelessWidget {  @override  Widget build(BuildContext context) {    return Scaffold(      backgroundColor: Colors.greenAccent,      appBar: AppBar(        title: Text('GeeksForGeeks'),        backgroundColor: Colors.green,      ),      body: Center(        child: Column(          mainAxisAlignment: MainAxisAlignment.center,          crossAxisAlignment: CrossAxisAlignment.center,          children: <Widget>[            RaisedButton(              child: Text('Rotate Transition Button'),              onPressed: () {                Navigator.push(                  context,                  PageTransition(                    curve: Curves.bounceOut,                    type: PageTransitionType.rotate,                    alignment: Alignment.topCenter,                    child: SecondPage(),                  ),                );              },            ),          ],        ),      ),    );  }} //definition of second pageclass SecondPage extends StatelessWidget {   final String title;   /// constructor of the page  const SecondPage({Key key, this.title}) : super(key: key);  @override  Widget build(BuildContext context) {    final args = ModalRoute.of(context).settings.arguments;    return Scaffold(      appBar: AppBar(        title: Text(args ?? "Page Transition Plugin"),      ),      body: Center(        child: Text('Second Page'),      ),    );  }}
Output:
varshagumber28
simranarora5sos
android
Flutter
Dart
Flutter
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