Flutter - Create Animation Using the AnimatedAlign Widget
Last Updated : 16 Oct, 2023
The AnimatedAlign widget in Flutter is used to create animated transitions for aligning a child widget within a parent container. It smoothly animates the alignment property, allowing you to move a child widget from one position to another with a specified duration. In this article, we are going to implement the AnimatedAlign widget. A sample video is given below to get an idea about what we are going to do in this article.
Basic Syntax of AnimatedAlign Widget
Dart AnimatedAlign( duration: Duration(milliseconds: 500), // Duration for the animation alignment: Alignment.center, // Alignment of the child widget curve: Curves.easeInOut, // Animation curve (optional) child: YourChildWidget(), // The widget you want to animate )
Required Tools
To build this app, you need the following items installed on your machine:
- Visual Studio Code / Android Studio
- Android Emulator / iOS Simulator / Physical Device device.
- Flutter Installed
- Flutter plugin for VS Code / Android Studio.
Step By Step Implementation
Step 1: Create a New Project in Android Studio
To set up Flutter Development on Android Studio please refer to Android Studio Setup for Flutter Development, and then create a new project in Android Studio please refer to Creating a Simple Application in Flutter.
Step 2: Import the Package
First of all import material.dart file.
import 'package:flutter/material.dart';
Step 3: Execute the main Method
Here the execution of our app starts.
Dart void main() { runApp(MyApp()); } Step 4: Create MyApp Class
In this class we are going to implement the MaterialApp , here we are also set the Theme of our App.
Dart class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( theme: ThemeData( primarySwatch: Colors.green, // Set the app's primary theme color ), debugShowCheckedModeBanner: false, home: AlignAnimationExample(), ); } } Step 5: Create AlignAnimationExample Class
In this class we are going to Implement the AlignAnimation widget that help to create animated transitions for aligning a child text widget within a parent container ,In this class we are going to align the container widget left to right and right to left.Comments are added for better understanding.
AnimatedAlign(
duration: Duration(seconds: 1), // Animation duration
alignment: _isAlignedRight
? Alignment.centerRight
: Alignment.centerLeft, // Toggle alignment
child: Container(
width: 100,
height: 100,
color: Colors.green, // Background color of the container
child: Center(
child: Text(
'Hello',
style: TextStyle(color: Colors.white), // Text color
),
),
),
),
Dart class AlignAnimationExample extends StatefulWidget { @override _AlignAnimationExampleState createState() => _AlignAnimationExampleState(); } class _AlignAnimationExampleState extends State<AlignAnimationExample> { bool _isAlignedRight = false; void _toggleAlignment() { setState(() { _isAlignedRight = !_isAlignedRight; // Toggle the alignment state }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('AnimatedAlign Demo'), // App bar title ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ AnimatedAlign( duration: Duration(seconds: 1), // Animation duration alignment: _isAlignedRight ? Alignment.centerRight : Alignment.centerLeft, // Toggle alignment child: Container( width: 100, height: 100, color: Colors.green, // Background color of the container child: Center( child: Text( 'Hello', style: TextStyle(color: Colors.white), // Text color ), ), ), ), SizedBox(height: 20), // Empty space between elements ElevatedButton( onPressed: _toggleAlignment, // Button click handler child: Text(_isAlignedRight ? 'Align Left' : 'Align Right'), // Button text ), ], ), ), ); } } Here is the full Code of main.dart file
Dart import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( theme: ThemeData( primarySwatch: Colors.green, // Set the app's primary theme color ), debugShowCheckedModeBanner: false, home: AlignAnimationExample(), ); } } class AlignAnimationExample extends StatefulWidget { @override _AlignAnimationExampleState createState() => _AlignAnimationExampleState(); } class _AlignAnimationExampleState extends State<AlignAnimationExample> { bool _isAlignedRight = false; void _toggleAlignment() { setState(() { _isAlignedRight = !_isAlignedRight; // Toggle the alignment state }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('AnimatedAlign Demo'), // App bar title ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ AnimatedAlign( duration: Duration(seconds: 1), // Animation duration alignment: _isAlignedRight ? Alignment.centerRight : Alignment.centerLeft, // Toggle alignment child: Container( width: 100, height: 100, color: Colors.green, // Background color of the container child: Center( child: Text( 'Hello', style: TextStyle(color: Colors.white), // Text color ), ), ), ), SizedBox(height: 20), // Empty space between elements ElevatedButton( onPressed: _toggleAlignment, // Button click handler child: Text(_isAlignedRight ? 'Align Left' : 'Align Right'), // Button text ), ], ), ), ); } } Output:
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