如何扩展list.generate中的元素

时间:2018-12-20 14:54:21

标签: listview flutter expand

我试图显示小部件(圆圈)的列表,但我想扩展它们并使圆圈占据整个页面。我尝试了不同的方法;我使用flexibe,flex和扩展。但是,它们都没有起作用。你能推荐一下吗? 提前致谢!  编辑:这是代码: //步进圈是我要在它们之间展开的小部件

return Expanded(
  flex: 10,

    child: Row(
      crossAxisAlignment: CrossAxisAlignment.stretch,
          children:
            List<Widget>.generate( numberOfCircles,
      (int index)  {
      return StreamBuilder(
        stream: stepperBloc.statusStream,
        initialData: {0:"incomplete", 1:"incomplete", 2:"incomplete"},
        builder:(_, AsyncSnapshot statusSnapshot){
          if(statusSnapshot.hasData){
          return   Row(
                children:<Widget>[ Flexible(
                flex:5,
                child: StepperCircle(
                index: index,
                status: statusSnapshot.data[index],
         // onTap: () => stepperBloc.statusSink({index: "selected"}),
              ),

            )],
          );

1 个答案:

答案 0 :(得分:1)

您可以尝试使用PageView小部件,它会扩展每个项目以填充屏幕(根据viewportFraction值),并且可以设置垂直或水平方向。

        PageController controller = PageController(viewportFraction: 1.0);

            return PageView(
              controller: controller,
              scrollDirection: Axis.vertical,
              children: <Widget>[
                Container(
                  color: Colors.red,
                ),
                Container(
                  color: Colors.blue,
                ),
                Container(
                  color: Colors.yellow,
                ),
              ],
            );

更多信息:https://docs.flutter.io/flutter/widgets/PageView-class.html