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),
);
}
}
Route _createRoute() {
return PageRouteBuilder(
pageBuilder: (context, animation, secondaryAnimation) => const Page2(),
transitionsBuilder: (context, animation, secondaryAnimation, child) {
const begin = Offset(0.0, 1.0);
const end = Offset.zero;
const curve = Curves.ease;
var tween = Tween(begin: begin, end: end).chain(CurveTween(curve: curve));
return SlideTransition(
position: animation.drive(tween),
child: child,
);
},
);
}
class Page2 extends StatelessWidget {
const Page2({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: const Center(
child: Text('Page 2'),
),
);
}
}<code_end>
<topic_end>
<topic_start>Animate a widget using a physics simulation
Physics simulations can make app interactions feel realistic and interactive.
For example, you might want to animate a widget to act as if it were attached to
a spring or falling with gravity.This recipe demonstrates how to move a widget from a dragged point back to the
center using a spring simulation.This recipe uses these steps:<topic_end>
<topic_start>
Step 1: Set up an animation controller
Start with a stateful widget called DraggableCard:
<code_start>import 'package:flutter/material.dart';
void main() {
runApp(const MaterialApp(home: PhysicsCardDragDemo()));
}
class PhysicsCardDragDemo extends StatelessWidget {
const PhysicsCardDragDemo({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: const DraggableCard(
child: FlutterLogo(
size: 128,
),
),
);
}
}
class DraggableCard extends StatefulWidget {
const DraggableCard({required this.child, super.key});
final Widget child;
@override
State<DraggableCard> createState() => _DraggableCardState();
}
class _DraggableCardState extends State<DraggableCard> {
@override
void initState() {
super.initState();
}
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
return Align(
child: Card(
child: widget.child,
),
);
}
}<code_end>
Make the _DraggableCardState class extend from
SingleTickerProviderStateMixin.
Then construct an AnimationController in
initState and set vsync to this.info Note
Extending SingleTickerProviderStateMixin allows the state object to be a
TickerProvider for the AnimationController. For more information, see the
documentation for TickerProvider.<topic_end>
<topic_start>
Step 2: Move the widget using gestures
Make the widget move when it’s dragged, and add an Alignment field to the
_DraggableCardState class:Add a GestureDetector that handles the onPanDown, onPanUpdate, and
onPanEnd callbacks. To adjust the alignment, use a MediaQuery to get the
size of the widget, and divide by 2. (This converts units of “pixels dragged” to
coordinates that Align uses.) Then, set the Align widget’s alignment to
_dragAlignment:<topic_end>
<topic_start>
Step 3: Animate the widget
When the widget is released, it should spring back to the center.Add an Animation<Alignment> field and an _runAnimation method. This