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Flutter – Hinge Animation
  • Last Updated : 21 Oct, 2020

Animations are a big part of the Flutter application. It makes an app sweet to the eyes and equally user-friendly. In this article, we will discuss in detail the Hinge animations. In Flutter there are two ways to work with animations namely:

  • A pub package
  • Animated Builder Widget

In this article, we will be working with the Animated Builder widget. A Hinge animation is a type of animation where an element can turn over with a sudden movement. To implement the same follow the below steps:

  • Create a dart file (say, hinge_animation) inside the lib folder of the project.
  • Add a FloatingActionButton to play the animation and a text to implement the animation inside the hinge_animation.dart file.
  • Now create a tween with a CurvedAnimation using the _rotationAnimation property.
  • Now use the Animation Controller to handle and create the instance of the animation.

Let’s explore these steps in detail.

The hinge_animation.dart file:

After adding the text, the FloatingActionButton, the AnimationController, and the curved animation the file would somewhat look like below:

Dart




import 'dart:math';
  
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
  
  
//create a stateful widget
class HingeAnimation extends StatefulWidget {
  @override
  _HingeAnimationState createState() => _HingeAnimationState();
  
}
  
class _HingeAnimationState extends State<HingeAnimation> with SingleTickerProviderStateMixin{
  // animation setup
  AnimationController _controller;
  Animation _rotationAnimation;
  Animation<double> _slideAnimation;
  Animation<double> _opacityAnimation;
  
  
  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      vsync: this,
      duration: Duration(milliseconds: 2000),
    );
  
    _rotationAnimation = Tween(end: 0.15, begin: 0.0)
        .animate(
      CurvedAnimation(
        parent: _controller,
        curve: Interval(
            0.0,
            0.5,
            curve: Curves.bounceInOut
        ),
      ),
    );
     // setrtup the Tween for creating curve
    _slideAnimation = Tween(begin: 100.0, end: 600.0).animate(
      CurvedAnimation(
        parent: _controller,
        curve: Interval(
            0.5,
            1.0,
            curve: Curves.fastOutSlowIn)
        ,
      ),
    );
      // setup opacticty as per need
    _opacityAnimation = Tween(begin: 1.0, end: 0.0).animate(
      CurvedAnimation(
        parent: _controller,
        curve: Interval(
            0.5,
            1.0,
            curve: Curves.fastOutSlowIn),
      ),
    );
  
  }
  
  @override
  void dispose() {
    super.dispose();
    _controller.dispose();
  }
  
  // the animation widget
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.green[300],
          automaticallyImplyLeading: false,
          title: Text("GeeksForGeeks"),
          centerTitle: true,
        ),
  
        body: AnimatedBuilder(
          animation: _slideAnimation,
          builder: (BuildContext context, Widget child) => Container(
            width: 200,
            height: 150,
            padding: EdgeInsets.all(0),
            margin: EdgeInsets.only(
              left: 100,
              top: _slideAnimation.value,
            ),
            child: RotationTransition(
              turns: _rotationAnimation,
              child: Center(
                child:
                Text('GeeksForGeeks', style: TextStyle(
                    fontSize: 25,
                    fontWeight: FontWeight.bold,
                    color: Color.fromRGBO(
                        300,
                        150,
                        500,
                        _opacityAnimation.value)
                ),),
              ),
            ),
          ),
        ),
        // the button
        floatingActionButtonLocation:
        FloatingActionButtonLocation.miniCenterFloat,
  
        floatingActionButton:
        FloatingActionButton(
          child: Icon(Icons.play_arrow),
          backgroundColor: Colors.green[300],
          onPressed: (){
            _controller.forward();
          },
        ),
    );
  }
}

The main.dart file:

This is the main structure of all flutter applications. After the above hinge_animation.dart file is completed we just need to import the same in the main.dart file as shown below:

Dart




import 'package:flutter/material.dart';
import 'package:flutter_hinge_animation.dart';
  
  
void main() => runApp(MyApp());
  
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      //theme: ThemeData.dark(),
      home: Splash(),
    );
  }
}

Output:

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