13. Flutter——AppBar按钮组件

1. Flutter 中的按钮组件

• 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

---

• 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	按钮颜色
disabledColor	Color	按钮禁用颜色
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

---

• 代码：

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"),
),
body: Center(
	child: Column(
		mainAxisAlignment: MainAxisAlignment.center,
		children: <Widget>[
			Row(
				mainAxisAlignment: MainAxisAlignment.center,
				children: <Widget>[
				RaisedButton(
				child: Text('普通按钮'),
				onpressed: () {
				print('点击了');
				},
			),
				SizedBox(width: 20),
				RaisedButton(
					child: Text('有颜色的按钮'),
					textColor: Colors.white,
					color: Colors.blue,
					onpressed: () {
						print('点击了');
				},
			),
				SizedBox(width: 20),
				RaisedButton(
					child: Text('阴影按钮'),
					textColor: Colors.white,
					color: Colors.blue,
					elevation:10,
					onpressed: () {
						print('点击了');
				},
			)
		],
	),
	SizedBox(height: 40),
	Row(
		mainAxisAlignment: MainAxisAlignment.center,
		children: <Widget>[
			Container(
			height: 60,
			width: 200,
			child: RaisedButton(
			 child: Text('有宽高的按钮'),
			 textColor: Colors.white,
			 color: Colors.blue,
			 elevation:10,
			 onpressed: () {
				print('点击了');
			},
		  )
		 )
		],
	),
	SizedBox(height: 40),
	Row(
		mainAxisAlignment: MainAxisAlignment.center,
		children: <Widget>[
			Expanded(
				child: Container(
					height: 60,
					margin: EdgeInsets.all(20),
					child: RaisedButton(
						child: Text('全屏按钮'),
						textColor: Colors.white,
						color: Colors.blue,
						elevation:10,
						onpressed: () {
							print('点击了');
						},
					),
				)
			  )
			],
		),
		Row(
			mainAxisAlignment: MainAxisAlignment.center,
			children: <Widget>[
			Expanded(
				child: Container(
				height: 60,
				margin: EdgeInsets.all(20),
				child: RaisedButton(
					child: Text('带圆角的按钮'),
					textColor: Colors.white,
					color: Colors.blue,
					elevation:10,
					shape: RoundedRectangleBorder(
					borderRadius: BorderRadius.circular(10),
				),
				onpressed: () {
					print('点击了');
				},
			 ),
			)
		   )
		 ],
	    )
	  ],
	),
  ),
 );
}
}