FLUTTER

flutter_carousel_slider

13 April 2023
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carousel_slider

A carousel slider widget.

Features

Infinite scroll
Custom child widgets
Auto play

Supported platforms

Flutter Android
Flutter iOS
Flutter web
Flutter desktop

Live preview

https://serenader2014.github.io/flutter_carousel_slider/#/

Note: this page is built with flutter-web. For a better user experience, please use a mobile device to open this link.

Installation

Add carousel_slider: ^4.2.1 to your pubspec.yaml dependencies. And import it:

import 'package:carousel_slider/carousel_slider.dart';

How to use

Simply create a CarouselSlider widget, and pass the required params:

CarouselSlider(
  options: CarouselOptions(height: 400.0),
  items: [1,2,3,4,5].map((i) {
    return Builder(
      builder: (BuildContext context) {
        return Container(
          width: MediaQuery.of(context).size.width,
          margin: EdgeInsets.symmetric(horizontal: 5.0),
          decoration: BoxDecoration(
            color: Colors.amber
          ),
          child: Text('text $i', style: TextStyle(fontSize: 16.0),)
        );
      },
    );
  }).toList(),
)

Params

CarouselSlider(
   items: items,
   options: CarouselOptions(
      height: 400,
      aspectRatio: 16/9,
      viewportFraction: 0.8,
      initialPage: 0,
      enableInfiniteScroll: true,
      reverse: false,
      autoPlay: true,
      autoPlayInterval: Duration(seconds: 3),
      autoPlayAnimationDuration: Duration(milliseconds: 800),
      autoPlayCurve: Curves.fastOutSlowIn,
      enlargeCenterPage: true,
      enlargeFactor: 0.3,
      onPageChanged: callbackFunction,
      scrollDirection: Axis.horizontal,
   )
 )

Since v2.0.0, you'll need to pass the options to CarouselOptions. For each option's usage you can refer to carousel_options.dart.

If you pass the height parameter, the aspectRatio parameter will be ignored.

Build item widgets on demand

This method will save memory by building items once it becomes necessary. This way they won't be built if they're not currently meant to be visible on screen. It can be used to build different child item widgets related to content or by item index.

CarouselSlider.builder(
  itemCount: 15,
  itemBuilder: (BuildContext context, int itemIndex, int pageViewIndex) =>
    Container(
      child: Text(itemIndex.toString()),
    ),
)

Carousel controller

In order to manually control the pageview's position, you can create your own CarouselController, and pass it to CarouselSlider. Then you can use the CarouselController instance to manipulate the position.

class CarouselDemo extends StatelessWidget {
  CarouselController buttonCarouselController = CarouselController();

 @override
  Widget build(BuildContext context) => Column(
    children: <Widget>[
      CarouselSlider(
        items: child,
        carouselController: buttonCarouselController,
        options: CarouselOptions(
          autoPlay: false,
          enlargeCenterPage: true,
          viewportFraction: 0.9,
          aspectRatio: 2.0,
          initialPage: 2,
        ),
      ),
      RaisedButton(
        onPressed: () => buttonCarouselController.nextPage(
            duration: Duration(milliseconds: 300), curve: Curves.linear),
        child: Text('→'),
      )
    ]
  );
}