第5章MaterialDesign风格组件-FloatingActionButton按钮组件

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import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'FloatingActionButton示例',
      home: Scaffold(
        appBar: AppBar(
          title: Text('FloatingActionButton示例'),
        ),
        body: Center(
          child: Text(
            'FloatingActionButton示例',
            style: TextStyle(fontSize: 28.0),
          ),
        ),
        floatingActionButton: new Builder(builder: (BuildContext context) {
          return new FloatingActionButton(
            child: const Icon(Icons.add),
            //提示信息
            tooltip: "请点击FloatingActionButton",
            //前景色为白色
            foregroundColor: Colors.white,
            //背景色为蓝色
            backgroundColor: Colors.blue,
            //未点击阴影值
            elevation: 7.0,
            //点击阴影值
            highlightElevation: 14.0,
            onPressed: () {
              //点击回调事件 弹出一句提示语句
              Scaffold.of(context).showSnackBar(new SnackBar(
                content: new Text("你点击了FloatingActionButton"),
              ));
            },
            mini: false,
            //圆形边
            shape: new CircleBorder(),
            isExtended: false,
          );
        }),
        floatingActionButtonLocation:
        FloatingActionButtonLocation.centerFloat, //居中放置 位置可以设置成左中右
      ),
    );
  }
}

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@作者: 亢少军