Flutter 中的常见的按钮组件 以及自定义按钮组件

Flutter 里有很多的 Button 组件很多，常见的按钮组件有:RaisedButton、FlatButton、

IconButton、OutlineButton、ButtonBar、FloatingActionButton 等。

RaisedButton :凸起的按钮，其实就是 Material Design 风格的 Button FlatButton :扁平化的按钮
OutlineButton:线框按钮
IconButton :图标按钮

ButtonBar:按钮组 FloatingActionButton:浮动按钮

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Flutter 按钮组件中的一些属性

属性名称	值类型	属性值
onPressed	VoidCallback ，一般接收一个 方法	必填参数，按下按钮时触发的回调，接收一个 方法，传 null 表示按钮禁用，会显示禁用相关 样式
child	Widget	文本控件

textColor	Color	文本颜色
color	Color	按钮的颜色
disabledColor	Color	按钮禁用时的颜色
disabledTextColor	Color	按钮禁用时的文本颜色
splashColor	Color	点击按钮时水波纹的颜色
highlightColor	Color	点击(长按)按钮后按钮的颜色
elevation	double	阴影的范围，值越大阴影范围越大
padding		内边距
shape		设置按钮的形状 shape: RoundedRectangleBorder( borderRadius: BorderRadius.circular(10), ) shape: CircleBorder( side: BorderSide( color: Colors.white, ) )

import 'package:flutter/material.dart';

class ButtonDemoPage extends StatelessWidget {
  const ButtonDemoPage({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("按钮演示页面"),
          actions: <Widget>[
            IconButton(
              icon: Icon(Icons.settings),
              onPressed: (){

              },
            )
          ],
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                RaisedButton(
                  child: Text('普通按钮'),
                  onPressed: () {
                    print("普通按钮");
                  },
                ),
                SizedBox( 5),
                RaisedButton(
                  child: Text('颜色按钮'),
                  color: Colors.blue,
                  textColor: Colors.white,
                  onPressed: () {
                    print("有颜色按钮");
                  },
                ),
                SizedBox( 5),
                RaisedButton(
                  child: Text('阴影按钮'),
                  color: Colors.blue,
                  textColor: Colors.white,
                  elevation: 20,
                  onPressed: () {
                    print("有阴影按钮");
                  },
                ),
                SizedBox( 5),
                RaisedButton.icon(
                    icon: Icon(Icons.search),
                    label: Text('图标按钮'),
                    color: Colors.blue,
                    textColor: Colors.white,
                    // onPressed: null,
                    onPressed: () {
                      print("图标按钮");
                    })
              ],
            ),
            SizedBox(height: 10),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Container(
                  height: 50,
                   400,
                  child: RaisedButton(
                    child: Text('宽度高度'),
                    color: Colors.blue,
                    textColor: Colors.white,
                    elevation: 20,
                    onPressed: () {
                      print("宽度高度");
                    },
                  ),
                )
              ],
            ),
            SizedBox(height: 10),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Expanded(
                  child: Container(
                    height: 60,
                    margin: EdgeInsets.all(10),
                    child: RaisedButton(
                      child: Text('自适应按钮'),
                      color: Colors.blue,
                      textColor: Colors.white,
                      elevation: 20,
                      onPressed: () {
                        print("自适应按钮");
                      },
                    ),
                  ),
                )
              ],
            ),
            SizedBox(height: 10),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                RaisedButton(
                    child: Text('圆角按钮'),
                    color: Colors.blue,
                    textColor: Colors.white,
                    elevation: 20,
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(10)),
                    onPressed: () {
                      print("圆角按钮");
                    }),
                Container(
                  height: 80,
                  child: RaisedButton(
                      child: Text('圆形按钮'),
                      color: Colors.blue,
                      textColor: Colors.white,
                      elevation: 20,
                      splashColor: Colors.red,
                      shape:
                          CircleBorder(side: BorderSide(color: Colors.white)),
                      onPressed: () {
                        print("圆形按钮");
                      }),
                ),
                FlatButton(
                  child: Text("按钮"),
                  color: Colors.blue,
                  textColor: Colors.yellow,
                  onPressed: () {
                    print('FlatButton');
                  },
                ),
                SizedBox( 10),
                OutlineButton(
                    child: Text("按钮"),
                    //  color: Colors.red,  //没有效果
                    //  textColor: Colors.yellow,
                    onPressed: () {
                      print('FlatButton');
                    })
              ],
            ),
            SizedBox(height: 10),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Expanded(
                  child: Container(
                    margin: EdgeInsets.all(20),
                    height: 50,
                    child: OutlineButton(child: Text("注册"), onPressed: () {}),
                  ),
                )
              ],
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.end,
              children: <Widget>[
                ButtonBar(
                  children: <Widget>[

                    RaisedButton(
                      child: Text('登录'),
                      color: Colors.blue,
                      textColor: Colors.white,
                      elevation: 20,
                      onPressed: () {
                        print("宽度高度");
                      },
                    ),
                    RaisedButton(
                      child: Text('注册'),
                      color: Colors.blue,
                      textColor: Colors.white,
                      elevation: 20,
                      onPressed: () {
                        print("宽度高度");
                      },
                    ),
                    MyButton(text: "自定义按钮",height: 60.0, 100.0,pressed: (){
                      print('自定义按钮');
                    })
                    
                  ],
                )
              ],
            )
          ],
        ));
  }
}


//自定义按钮组件

class MyButton extends StatelessWidget {
  final text;
  final pressed;
  final width;
  final height;
  const MyButton({this.text='',this.pressed=null,this.width=80,this.height=30}) ;

  @override
  Widget build(BuildContext context) {
    return Container(
      height: this.height,
       this.width,
      child: RaisedButton(
        child: Text(this.text),
        onPressed:this.pressed ,
      ),
    );
  }
}