flutter basewidget简单封装

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import 'package:flutter/material.dart';
import 'LoadingDialog.dart';
import 'package:fluttertoast/fluttertoast.dart';
class BaseWidget extends StatefulWidget {
  @override
  State<BaseWidget> createState() => BaseWidgetState();
}

class BaseWidgetState<T extends BaseWidget> extends State<T> {
  BuildContext context;
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    this.context=context;
    return Scaffold(
      appBar: appbar("测试",null),
      body: new Container(
        color: Color.fromRGBO(0, 0, 0, 0),
      ),
    );
  }
  
  
  void showLoading(String s,bool dismissible){
  showDialog(context: context,
      barrierDismissible: dismissible,
      builder: (BuildContext context) {
        return new LoadingDialog( //调用对话框
          text: s==""?'正在获取详情...':s,
        );
      }
  );
    
  }

  Widget appbar(String title,List<Widget> actions){
    return AppBar(title: Text(title),
    centerTitle: true,
    leading: GestureDetector(
      child: Image.asset("images/back.png",fit: BoxFit.contain,),
      onTap: (){
        dispose();
      },
    ),
     actions: actions,
    );
  }

  void showToast(String msg){
    Fluttertoast.showToast(msg: msg);
  }


}

dialoghttps://www.jianshu.com/p/4bbbb5aa855d

class LoadingDialog extends Dialog {
  String text;

  LoadingDialog({Key key, @required this.text}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return new Material( //创建透明层
      type: MaterialType.transparency, //透明类型
      child: new Center( //保证控件居中效果
        child: new SizedBox(
          width: 120.0,
          height: 120.0,
          child: new Container(
            decoration: ShapeDecoration(
              color: Color(0xffffffff),
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.all(
                  Radius.circular(8.0),
                ),
              ),
            ),
            child: new Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: <Widget>[
                new CircularProgressIndicator(),
                new Padding(
                  padding: const EdgeInsets.only(
                    top: 20.0,
                  ),
                  child: new Text(
                    text,
                    style: new TextStyle(fontSize: 12.0),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}