There is no Animated grid for Flutter So, what i am trying to achieve is scroll the gridview like orbit in flutter. Like below. Tried using TweenAnimationBuilder
and flutter_staggered_animations: ^1.0.0
Package. But cannot able to achieve the expected result
TweenAnimationBuilder code is
import 'package:flutter/material.dart';
import 'dart:math' as math;
import 'package:tween_animation_check/animatedgeidView.dart';
import 'package:flutter_staggered_animations/flutter_staggered_animations.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
int _counter = 0;
var string = [
0,
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
];
_onStartScroll(ScrollMetrics metrics) {
// if you need to do something at the start
}
_onUpdateScroll(ScrollMetrics metrics) {
// do your magic here to change the value
// if(spaceBetween == 30.0) return;
// spaceBetween = 30.0;
setState(() {});
}
_onEndScroll(ScrollMetrics metrics) {
// do your magic here to return the value to normal
setState(() {});
}
late final AnimationController rotationAnimationController =
AnimationController(vsync: this, duration: const Duration(seconds: 2));
ScrollController scrollController = ScrollController();
late final AnimationController _controller = AnimationController(
duration: const Duration(seconds: 1),
reverseDuration: Duration(seconds: 1),
animationBehavior: AnimationBehavior.normal,
vsync: this,
)..repeat(reverse: false);
late final Animation<double> _animation = CurvedAnimation(
parent: _controller, curve: Curves.easeIn, reverseCurve: Curves.easeIn);
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
void initState() {
// TODO: implement initState
super.initState();
scrollController.addListener(() {
print(scrollController.offset);
// string.forEach((element) {
// //element % 2 == 0 ?
// });
// rotationAnimationController.animateTo(scrollController.offset, duration: Duration(seconds: 3), curve: Curves.bounceIn);
// Scrollable.ensureVisible(animatedBoxKey.,curve: Curves.bounceIn, duration: Duration(seconds: 2));
});
//rotationAnimationController.animateTo(0.5);
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
child: GridView.count(
crossAxisCount: 2,
crossAxisSpacing: 70,
mainAxisSpacing: 70,
reverse: true,
controller: scrollController,
children: string.map((e) {
//string.map((e) {
return TweenAnimationBuilder(
tween: Tween<double>(begin: 0.9, end: 0),
curve: Curves.easeIn,
duration: const Duration(seconds: 2),
builder: ((context, value, child) {
return Transform.translate(
filterQuality: FilterQuality.low,
offset: e.isEven ? Offset(value * e * -500, 0.0) : Offset(value * e * 500, 0.0),
child: Transform.translate(
offset: e.isEven
? Offset(0.0, value * e * -500)
: Offset(0.0, value * e * -500),
child: child,
),
);
}),
child: Container(
child: Text(e.toString()),
color: Colors.red,
height: 50,
),
);
}).toList()),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
Struggling for a week. Guide me what i have done wrong here. Thanks in advance
3
Answers
A
GridView
cannot handle the non-linear animation you are looking for.Maybe you can use a
Stack
and aGestureController
to plase and animate your elements on screen.check this video
Try This packge
my attempt to implement this effect
features:
limitations:
demo:
https://imgur.com/a/Bf05349
code:
orbit_page.dart
orbit_view.dart