import 'dart:math' as math;
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart' show timeDilation;
class Photo extends StatelessWidget {
Photo({ Key key, this.photo, this.color, this.onTap }) : super(key: key);
final String photo;
final Color color;
final VoidCallback onTap;
Widget build(BuildContext context) {
return Material(
color: Theme.of(context).primaryColor.withOpacity(0.25),
child: InkWell(
onTap: onTap,
child: LayoutBuilder(
builder: (BuildContext context, BoxConstraints size) {
return Image.asset(
photo,
fit: BoxFit.contain,
);
},
),
),
);
}
}
class RadialExpansion extends StatelessWidget {
RadialExpansion({
Key key,
this.maxRadius,
this.child,
}) : clipRectSize = 2.0 * (maxRadius / math.sqrt2),
super(key: key);
final double maxRadius;
final clipRectSize;
final Widget child;
@override
Widget build(BuildContext context) {
return ClipOval(
child: Center(
child: SizedBox(
width: clipRectSize,
height: clipRectSize,
child: ClipRect(
child: child,
),
),
),
);
}
}
class RadialExpansionDemo extends StatelessWidget {
static const double kMinRadius = 32.0;
static const double kMaxRadius = 128.0;
static const opacityCurve = const Interval(0.0, 0.75, curve: Curves.fastOutSlowIn);
static RectTween _createRectTween(Rect begin, Rect end) {
return MaterialRectCenterArcTween(begin: begin, end: end);
}
static Widget _buildPage(BuildContext context, String imageName, String description) {
return Container(
color: Theme.of(context).canvasColor,
child: Center(
child: Card(
elevation: 8.0,
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
SizedBox(
width: kMaxRadius * 2.0,
height: kMaxRadius * 2.0,
child: Hero(
createRectTween: _createRectTween,
tag: imageName,
child: RadialExpansion(
maxRadius: kMaxRadius,
child: Photo(
photo: imageName,
onTap: () {
Navigator.of(context).pop();
},
),
),
),
),
Text(
description,
style: TextStyle(fontWeight: FontWeight.bold),
textScaleFactor: 3.0,
),
const SizedBox(height: 20.0),
],
),
),
),
);
}
Widget _buildHero(BuildContext context, String imageName, String description) {
return Container(
width: kMinRadius * 3.0,
height: kMinRadius * 3.0,
child: Hero(
createRectTween: _createRectTween,
tag: imageName,
child: RadialExpansion(
maxRadius: kMaxRadius,
child: Photo(
photo: imageName,
onTap: () {
Navigator.of(context).push(
PageRouteBuilder<void>(
pageBuilder: (BuildContext context,
Animation<double> animation,
Animation<double> secondaryAnimation) {
return AnimatedBuilder(
animation: animation,
builder: (BuildContext context, Widget child) {
return Opacity(
opacity: opacityCurve.transform(animation.value),
child: _buildPage(context, imageName, description,),
);
}
);
},
),
);
},
),
),
),
);
}
@override
Widget build(BuildContext context) {
// animation speed.
timeDilation = 4.0;
return Scaffold(
appBar: AppBar(
title: const Text('GeeksForGeeks'),
backgroundColor: Colors.green,
),
body: Container(
padding: const EdgeInsets.all(33.0),
alignment: FractionalOffset.bottomLeft,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
_buildHero(context, 'assets/images/aquaman.png', 'Aquaman'),
_buildHero(context, 'assets/images/superman.jpg', 'Superman'),
_buildHero(context, 'assets/images/wonderwomen.jpg', 'Wonderwomen'),
],
),
),
);
}
}
void main() {
runApp(MaterialApp(home: RadialExpansionDemo()));
}
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