flutter 轮播图Swiper组件

flutter 轮播图Swiper组件

/* 
  轮播图组件 
  使用组件方式: ImgSwiper(arrList: arrList)
  数据结构:[{'src':'图片网络地址','url':'窗口跳转路由地址'}]
*/
class ImgSwiper extends StatefulWidget {
  final List arrList;
  final double height;
  final double radius;
  final int seconds;
  final EdgeInsetsGeometry margin;

  const ImgSwiper({
    Key? key,
    required this.arrList,
    this.seconds = 3, //轮播时间
    this.radius = 2, //度数越小越圆
    this.height = 3, //宽度的比例数
    this.margin = const EdgeInsets.fromLTRB(10, 5, 10, 2),
  }) : super(key: key);

  @override
  _ImgSwiperState createState() => _ImgSwiperState();
}

class _ImgSwiperState extends State<ImgSwiper> {
  int intTap = 0;
  late Timer xTimer;

  @override
  void initState() {
    super.initState();

    xTimer = Timer.periodic(Duration(seconds: widget.seconds), (timer) {
      intTap++;
      if (intTap >= widget.arrList.length) {
        intTap = 0;
      }
      setState(() {});
    });
  }

  @override
  void dispose() {
    xTimer.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final size = MediaQuery.of(context).size;

    return Stack(
      children: [
        Container(
          width: size.width,
          height: (size.width / widget.height),
          margin: widget.margin,
          decoration: BoxDecoration(
            color: const Color.fromARGB(123, 225, 225, 235),
            borderRadius: BorderRadius.circular(size.width / widget.radius),
          ),
          clipBehavior: Clip.hardEdge,
          child: PageView.builder(
            onPageChanged: (index) {
              intTap = index % widget.arrList.length;
              setState(() {});
            },
            itemBuilder: (context, index) {
              return InkWell(
                onTap: () {
                  if (widget.arrList[intTap]["url"] != null) {
                    Navigator.of(context).push(
                      MaterialPageRoute(
                        builder: (BuildContext context) =>
                            widget.arrList[intTap]["url"], // 跳转页面路由
                      ),
                    );
                  }
                },
                child: Image.network(
                  widget.arrList[intTap]["src"]!,
                  fit: BoxFit.cover,
                  key: UniqueKey(),
                ),
              );
            },
          ),
        ),
        Positioned(
          right: 1,
          bottom: -5,
          child: Container(
            padding: const EdgeInsets.all(10),
            alignment: Alignment.center,
            decoration: const BoxDecoration(
              color: Color.fromARGB(190, 238, 241, 245),
              borderRadius: BorderRadius.only(
                topLeft: Radius.circular(30),
              ),
            ),
            child: Text(
              "${intTap + 1}/${widget.arrList.length}",
              style: const TextStyle(
                color: Color.fromARGB(255, 155, 147, 147),
                fontWeight: FontWeight.bold,
                fontStyle: FontStyle.italic,
              ),
            ),
          ),
        ),
      ],
    );
  }
}
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