如何在颤动中制作水平滚动动画
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【中文标题】如何在颤动中制作水平滚动动画【英文标题】：how to make a horizontal scroll animation in flutter 【发布时间】：2020-06-17 04:04:59 【问题描述】：我想用这样的动画制作一个可滚动的列表视图，我该如何完成
PS：不要介意有bug的动画，它只是为了说明而已
【问题讨论】：
你看过pub.dev/packages/carousel_slider吗？ 【参考方案1】：您可以在下面复制粘贴运行完整代码
你可以使用包https://pub.dev/packages/carousel_slider
您可以使用title 和image url 定义一个类，请参阅下面的完整代码
并设置CarouselSlider enlargeCenterPage: true
代码sn-p
//Auto playing carousel
final CarouselSlider autoPlayDemo = CarouselSlider(
viewportFraction: 0.7,
aspectRatio: 2.0,
autoPlay: true,
enlargeCenterPage: true,
items: payloadList.map((payload)
return Builder(builder: (BuildContext context)
return Column(
children: <Widget>[
Text(payload.title),
Flexible(
child: Container(
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.symmetric(horizontal: 10.0),
decoration: BoxDecoration(
color: Colors.transparent,
),
child: Image.network(
payload.imageUrl,
height: 250,
width: 250,
//fit: BoxFit.fill,
),
),
),
],
);
);
).toList(),
);
工作演示
完整代码
import 'package:carousel_slider/carousel_slider.dart';
import 'package:flutter/material.dart';
class Payload
String title;
String imageUrl;
Payload(this.title, this.imageUrl);
final List<Payload> payloadList = [
Payload(
title: "Title 1",
imageUrl: 'https://via.placeholder.com/250x200',
),
Payload(
title: "Title 2",
imageUrl: 'https://via.placeholder.com/250x200',
),
Payload(
title: "Title 3",
imageUrl: 'https://via.placeholder.com/250x200',
),
];
final List<String> imgList = [
'https://images.unsplash.com/photo-1520342868574-5fa3804e551c?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=6ff92caffcdd63681a35134a6770ed3b&auto=format&fit=crop&w=1951&q=80',
'https://images.unsplash.com/photo-1522205408450-add114ad53fe?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=368f45b0888aeb0b7b08e3a1084d3ede&auto=format&fit=crop&w=1950&q=80',
'https://images.unsplash.com/photo-1519125323398-675f0ddb6308?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=94a1e718d89ca60a6337a6008341ca50&auto=format&fit=crop&w=1950&q=80',
'https://images.unsplash.com/photo-1523205771623-e0faa4d2813d?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=89719a0d55dd05e2deae4120227e6efc&auto=format&fit=crop&w=1953&q=80',
'https://images.unsplash.com/photo-1508704019882-f9cf40e475b4?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=8c6e5e3aba713b17aa1fe71ab4f0ae5b&auto=format&fit=crop&w=1352&q=80',
'https://images.unsplash.com/photo-1519985176271-adb1088fa94c?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=a0c8d632e977f94e5d312d9893258f59&auto=format&fit=crop&w=1355&q=80'
];
void main() => runApp(CarouselDemo());
final Widget placeholder = Container(color: Colors.grey);
final List child = map<Widget>(
imgList,
(index, i)
return Container(
margin: EdgeInsets.all(5.0),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(5.0)),
child: Stack(children: <Widget>[
Image.network(i, fit: BoxFit.cover, width: 1000.0),
Positioned(
bottom: 0.0,
left: 0.0,
right: 0.0,
child: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [
Color.fromARGB(200, 0, 0, 0),
Color.fromARGB(0, 0, 0, 0)
],
begin: Alignment.bottomCenter,
end: Alignment.topCenter,
),
),
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 20.0),
child: Text(
'No. $index image',
style: TextStyle(
color: Colors.white,
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
),
),
]),
),
);
,
).toList();
List<T> map<T>(List list, Function handler)
List<T> result = [];
for (var i = 0; i < list.length; i++)
result.add(handler(i, list[i]));
return result;
class CarouselWithIndicator extends StatefulWidget
@override
_CarouselWithIndicatorState createState() => _CarouselWithIndicatorState();
class _CarouselWithIndicatorState extends State<CarouselWithIndicator>
int _current = 0;
@override
Widget build(BuildContext context)
return Column(children: [
CarouselSlider(
items: child,
autoPlay: true,
enlargeCenterPage: true,
aspectRatio: 2.0,
onPageChanged: (index)
setState(()
_current = index;
);
,
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: map<Widget>(
imgList,
(index, url)
return Container(
width: 8.0,
height: 8.0,
margin: EdgeInsets.symmetric(vertical: 10.0, horizontal: 2.0),
decoration: BoxDecoration(
shape: BoxShape.circle,
color: _current == index
? Color.fromRGBO(0, 0, 0, 0.9)
: Color.fromRGBO(0, 0, 0, 0.4)),
);
,
),
),
]);
class CarouselDemo extends StatelessWidget
@override
Widget build(BuildContext context)
//Manually operated Carousel
final CarouselSlider manualCarouselDemo = CarouselSlider(
items: child,
autoPlay: false,
enlargeCenterPage: true,
viewportFraction: 0.9,
aspectRatio: 2.0,
);
//Auto playing carousel
final CarouselSlider autoPlayDemo = CarouselSlider(
viewportFraction: 0.7,
aspectRatio: 2.0,
autoPlay: true,
enlargeCenterPage: true,
items: payloadList.map((payload)
return Builder(builder: (BuildContext context)
return Column(
children: <Widget>[
Text(payload.title),
Flexible(
child: Container(
width: MediaQuery.of(context).size.width,
margin: EdgeInsets.symmetric(horizontal: 10.0),
decoration: BoxDecoration(
color: Colors.transparent,
),
child: Image.network(
payload.imageUrl,
height: 250,
width: 250,
//fit: BoxFit.fill,
),
),
),
],
);
);
).toList(),
);
//Button controlled carousel
Widget buttonDemo()
final basicSlider = CarouselSlider(
items: child,
autoPlay: false,
enlargeCenterPage: true,
viewportFraction: 0.9,
aspectRatio: 2.0,
initialPage: 2,
);
return Column(children: [
basicSlider,
Row(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
Flexible(
child: RaisedButton(
onPressed: () => basicSlider.previousPage(
duration: Duration(milliseconds: 300), curve: Curves.linear),
child: Text('←'),
),
),
Flexible(
child: RaisedButton(
onPressed: () => basicSlider.nextPage(
duration: Duration(milliseconds: 300), curve: Curves.linear),
child: Text('→'),
),
),
...Iterable<int>.generate(imgList.length).map(
(int pageIndex) => Flexible(
child: RaisedButton(
onPressed: () => basicSlider.animateToPage(pageIndex,
duration: Duration(milliseconds: 300),
curve: Curves.linear),
child: Text("$pageIndex"),
),
),
),
]),
]);
//Pages covers entire carousel
final CarouselSlider coverScreenExample = CarouselSlider(
viewportFraction: 1.0,
aspectRatio: 2.0,
autoPlay: false,
enlargeCenterPage: false,
items: map<Widget>(
imgList,
(index, i)
return Container(
decoration: BoxDecoration(
image: DecorationImage(image: NetworkImage(i), fit: BoxFit.cover),
),
);
,
),
);
//User input pauses carousels automatic playback
final CarouselSlider touchDetectionDemo = CarouselSlider(
viewportFraction: 0.9,
aspectRatio: 2.0,
autoPlay: true,
enlargeCenterPage: true,
pauseAutoPlayOnTouch: Duration(seconds: 3),
items: imgList.map(
(url)
return Container(
margin: EdgeInsets.all(5.0),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(5.0)),
child: Image.network(
url,
fit: BoxFit.cover,
width: 1000.0,
),
),
);
,
).toList(),
);
//Non-looping manual Carousel
final CarouselSlider nonLoopingCarousel = CarouselSlider(
items: child,
scrollPhysics: BouncingScrollPhysics(),
enableInfiniteScroll: false,
autoPlay: false,
enlargeCenterPage: true,
viewportFraction: 0.9,
aspectRatio: 2.0,
);
//Vertical carousel
final CarouselSlider verticalScrollCarousel = CarouselSlider(
scrollDirection: Axis.vertical,
aspectRatio: 2.0,
autoPlay: true,
enlargeCenterPage: true,
viewportFraction: 0.9,
pauseAutoPlayOnTouch: Duration(seconds: 3),
items: imgList.map(
(url)
return Container(
margin: EdgeInsets.all(5.0),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(5.0)),
child: Image.network(
url,
fit: BoxFit.cover,
width: 1000.0,
),
),
);
,
).toList(),
);
//create full screen Carousel with context
CarouselSlider getFullScreenCarousel(BuildContext mediaContext)
return CarouselSlider(
autoPlay: true,
viewportFraction: 1.0,
aspectRatio: MediaQuery.of(mediaContext).size.aspectRatio,
items: imgList.map(
(url)
return Container(
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(0.0)),
child: Image.network(
url,
fit: BoxFit.cover,
width: 1000.0,
),
),
);
,
).toList(),
);
CarouselSlider getOnDemandCarousel(BuildContext mediaContext)
return CarouselSlider.builder(
scrollDirection: Axis.horizontal,
itemCount: 15,
itemBuilder: (BuildContext context, int itemIndex) => Container(
child: Text(itemIndex.toString()),
),
);
return MaterialApp(
title: 'demo',
home: Scaffold(
appBar: AppBar(title: Text('Carousel slider demo')),
body: ListView(
children: <Widget>[
/*Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Manuell Carousel'),
manualCarouselDemo,
])),*/
Padding(
padding: EdgeInsets.symmetric(vertical: 0.0),
child: Column(children: [
//Text('Auto Playing Carousel'),
autoPlayDemo,
])),
/*Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Button Controlled Carousel'),
buttonDemo(),
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Full Screen Carousel'),
coverScreenExample,
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Carousel With Indecator'),
CarouselWithIndicator(),
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Pause When Touched Carousel'),
touchDetectionDemo,
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('No infinity scroll carousel'),
nonLoopingCarousel,
])),
Padding(
padding: EdgeInsets.symmetric(vertical: 15.0),
child: Column(children: [
Text('Vertical scroll carousel'),
verticalScrollCarousel,
])),
Padding(
padding: EdgeInsets.only(top: 15.0),
//Builder needed to provide mediaQuery context from material app
child: Builder(builder: (context)
return Column(children: [
Text('Full screen carousel'),
getFullScreenCarousel(context),
]);
)),
Padding(
padding: EdgeInsets.only(top: 15.0),
child: Builder(builder: (context)
return Column(children: [
Text('On demand item carousel'),
getOnDemandCarousel(context),
]);
)),*/
],
),
),
);
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