import 'package:flutter/material.dart';


/***
 *
 * 创建人：xuqing
 * 创建时间：2020年10月16日20:28:35
 * ；类说明：设置页面
 *
 *
 *
 *
 */

class Setting extends StatefulWidget {
  Setting({Key key}) : super(key: key);

  @override
  _SettingState createState() {
    return _SettingState();
  }
}
class _SettingState extends State<Setting>with  AutomaticKeepAliveClientMixin  {
  List<String>datastirng=[];

@override
bool get wantKeepAlive =>true;

void addlist() {
    setState(() {
      List<String> list = [];
      for (int i = 0; i < 5; i++) {
        list.add(i.toString());
      }
      datastirng.addAll(list);
    });
}
@override
  void initState() {
  super.initState();
  }

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

@override
Widget build(BuildContext context) {


  // TODO: implement build
  return Scaffold(
    body:Container(
      child: GridView.builder(
         itemCount: datastirng.length,
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
          //横轴元素个数
            crossAxisCount: 3,
            //纵轴间距
            mainAxisSpacing: 20.0,
            //横轴间距
            crossAxisSpacing: 10.0,
            //子组件宽高长度比例
            childAspectRatio: 1.0),
          itemBuilder: (BuildContext context, int index) {
            //Widget Function(BuildContext context, int index)
            return getItemContainer(datastirng,index);
          }),
    ),

    floatingActionButton: FloatingActionButton(
      tooltip: "Incement",
      child: Icon(Icons.add),
      onPressed: (){
        addlist();
      },
    ),
  );
}
   Widget  getItemContainer(List<String>data, int index){
    return Container(
      width: 150,
      height: 100,
      color: Colors.blue,
      child:Center(
        child: Text(data[index]+"条数据"),
      ),
    );
   }

}