Flutter学习笔记（20）--FloatingActionButton、PopupMenuButton、SimpleDialog、AlertDialog、SnackBar
如需转载，请注明出处：Flutter学习笔记（20）--FloatingActionButton、PopupMenuButton、SimpleDialog、AlertDialog、SnackBar
FloatingActionButton
FloatingActionButton对应一个圆形图标按钮，悬停在内容之上，以展示对应程序中的主要动作，所以非常醒目，类似于iOS系统里的小白点按钮。
FloatingActionButton组件属性及描述如下：
- child：child一般为icon，不推荐使用文字
- tooltip：按钮提示文字
- foregroundColor：前景色
- backgroundColor：背景色
- elevation：未点击时阴影值，默认6.0
- hignlightElevation：点击时阴影值
- onPressed：点击事件回调
- shape：定义按钮的shape，设置shape时，默认的elevation将会失效，默认为CircleBorder
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart'; void main() => runApp(DemoApp()); class DemoApp extends StatelessWidget{
@override
Widget build(BuildContext context) {
// TODO: implement build
return new MaterialApp(
title: 'FloatingButton Demo',
debugShowCheckedModeBanner: false,
home: new Scaffold(
appBar: AppBar(
title: new Text('FloatingButton Demo'),
),
drawer: Drawer(
child: ListView(
children: <Widget>[
UserAccountsDrawerHeader(
accountName: new Text('FloatingButton Demo'),
accountEmail: new Text('www.baidu.com'),
currentAccountPicture: new CircleAvatar(
backgroundImage: AssetImage('images/user.jpeg'),
),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
)
],
),
),
floatingActionButton: new Builder(builder: (BuildContext context){
return new FloatingActionButton(
child: Icon(Icons.album),
foregroundColor: Colors.amberAccent,
backgroundColor: Colors.deepPurple,
elevation: 10.0,
highlightElevation: 20.0,
mini: false,
onPressed: (){
Scaffold.of(context).showSnackBar(new SnackBar(content: new Text('点击了FloatingButton')));
}
);
}),
floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
),
);
} }
PopupMenuButton
构造方法：
const PopupMenuButton({
Key key,
@required this.itemBuilder,//item子项，可以为任意类型
this.initialValue,//初始值
this.onSelected,//选中其中一项时回调
this.onCanceled,//点击空白处，不选择时回调
this.tooltip,//提示
this.elevation = 8.0,//阴影大小
this.padding = const EdgeInsets.all(8.0),//padding
this.child,
this.icon,
this.offset = Offset.zero,
}) : assert(itemBuilder != null),
assert(offset != null),
assert(!(child != null && icon != null)), // fails if passed both parameters
super(key: key);
demo示例：
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart'; void main() => runApp(DemoApp()); class DemoApp extends StatelessWidget{
@override
Widget build(BuildContext context) {
// TODO: implement build
return new MaterialApp(
title: 'FloatingButton Demo',
debugShowCheckedModeBanner: false,
home: new Scaffold(
body: new Center(
child: _showPopupMenuButton(),
),
appBar: AppBar(
title: new Text('FloatingButton Demo'),
),
drawer: Drawer(
child: ListView(
children: <Widget>[
UserAccountsDrawerHeader(
accountName: new Text('FloatingButton Demo'),
accountEmail: new Text('www.baidu.com'),
currentAccountPicture: new CircleAvatar(
backgroundImage: AssetImage('images/user.jpeg'),
),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
)
],
),
),
floatingActionButton: new Builder(builder: (BuildContext context){
return new FloatingActionButton(
child: Icon(Icons.album),
foregroundColor: Colors.amberAccent,
backgroundColor: Colors.deepPurple,
elevation: 10.0,
highlightElevation: 20.0,
mini: false,
onPressed: (){
},
);
}),
floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
),
);
} PopupMenuButton _showPopupMenuButton() {
return PopupMenuButton(
icon: Icon(Icons.menu),
itemBuilder: (BuildContext context) => <PopupMenuEntry>[
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton1"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton2"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton3"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton4"),
),
),
]
);
}
}
效果截图：
SimpleDialog
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart'; void main() => runApp(DemoApp()); class DemoApp extends StatelessWidget{
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'FloatingButton Demo',
debugShowCheckedModeBanner: false,
home: mHomePage(),
);
}
} class mHomePage extends StatefulWidget{
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _mHomePage();
}
} class _mHomePage extends State {
@override
Widget build(BuildContext context) {
// TODO: implement build
return new Scaffold(
body: new Center(
child: _showPopupMenuButton(),
),
appBar: AppBar(
title: new Text('FloatingButton Demo'),
),
drawer: Drawer(
child: ListView(
children: <Widget>[
UserAccountsDrawerHeader(
accountName: new Text('FloatingButton Demo'),
accountEmail: new Text('www.baidu.com'),
currentAccountPicture: new CircleAvatar(
backgroundImage: AssetImage('images/user.jpeg'),
),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
)
],
),
),
floatingActionButton: new FloatingActionButton(
child: Icon(Icons.album),
foregroundColor: Colors.amberAccent,
backgroundColor: Colors.deepPurple,
elevation: 10.0,
highlightElevation: 20.0,
mini: false,
onPressed: (){
_showSimpleDialog(context);
},
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
);
} PopupMenuButton _showPopupMenuButton() {
return PopupMenuButton(
icon: Icon(Icons.menu),
itemBuilder: (BuildContext context) => <PopupMenuEntry>[
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton1"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton2"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton3"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton4"),
),
),
]
);
} void _showSimpleDialog(BuildContext context) {
showDialog(
context: context,
builder: (BuildContext context){
return SimpleDialog(
title: new Text('SimpleDialog Demo'),
children: <Widget>[
SimpleDialogOption(
child: Text('选项1'),
),
SimpleDialogOption(
child: Text('选项2'),
onPressed: (){
Navigator.pop(context);
},
),
],
);
}
);
}
}
效果截图：
AlertDialog
AlertDialog常用属性：
const AlertDialog({
Key key,
this.title,//对话框顶部提示文案
this.titlePadding,
this.titleTextStyle,//对话框顶部提示文案字体样式
this.content,//内容部分，对话框的提示内容，通常为文字
this.contentPadding = const EdgeInsets.fromLTRB(24.0, 20.0, 24.0, 24.0),
this.contentTextStyle,//对话框提示内容的字体样式
this.actions,//对话框底部操作按钮
this.backgroundColor,//对话框背景色
this.elevation,
this.semanticLabel,
this.shape,
}) : assert(contentPadding != null),
super(key: key);
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart'; void main() => runApp(DemoApp()); class DemoApp extends StatelessWidget{
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'FloatingButton Demo',
debugShowCheckedModeBanner: false,
home: mHomePage(),
);
}
} class mHomePage extends StatefulWidget{
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _mHomePage();
}
} class _mHomePage extends State {
@override
Widget build(BuildContext context) {
// TODO: implement build
return new Scaffold(
body: new Center(
child: _showPopupMenuButton(),
),
appBar: AppBar(
title: new Text('FloatingButton Demo'),
),
drawer: Drawer(
child: ListView(
children: <Widget>[
UserAccountsDrawerHeader(
accountName: new Text('FloatingButton Demo'),
accountEmail: new Text('www.baidu.com'),
currentAccountPicture: new CircleAvatar(
backgroundImage: AssetImage('images/user.jpeg'),
),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
)
],
),
),
floatingActionButton: new FloatingActionButton(
child: Icon(Icons.album),
foregroundColor: Colors.amberAccent,
backgroundColor: Colors.deepPurple,
elevation: 10.0,
highlightElevation: 20.0,
mini: false,
onPressed: (){
// _showSimpleDialog(context);
_showAlertDialog(context);
},
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
);
} PopupMenuButton _showPopupMenuButton() {
return PopupMenuButton(
icon: Icon(Icons.menu),
itemBuilder: (BuildContext context) => <PopupMenuEntry>[
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton1"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton2"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton3"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton4"),
),
),
]
);
} void _showSimpleDialog(BuildContext context) {
showDialog(
context: context,
builder: (BuildContext context){
return SimpleDialog(
title: new Text('SimpleDialog Demo'),
children: <Widget>[
SimpleDialogOption(
child: Text('选项1'),
),
SimpleDialogOption(
child: Text('选项2'),
onPressed: (){
Navigator.pop(context);
},
),
],
);
}
);
} void _showAlertDialog(BuildContext context) {
showDialog(
context: context,
builder: (BuildContext context){
return AlertDialog(
title: new Text('提示'),
content: new Text('这是提示框的内容'),
actions: <Widget>[
FlatButton(onPressed: null, child: new Text('确定'),disabledTextColor: Colors.blueAccent,),
FlatButton(onPressed: null, child: new Text('取消'),disabledColor: Colors.deepPurple,),
],
);
}
);
}
}
效果截图：
SnackBar
SnackBar是一个轻量级消息提示组件，在屏幕的底部显示，SnackBar常用属性如下：
const SnackBar({
Key key,
@required this.content,//提示内容
this.backgroundColor,//背景色
this.action,
this.duration = _kSnackBarDisplayDuration,//提示时常
this.animation,//弹出动画
}) : assert(content != null),
assert(duration != null),
super(key: key);
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart'; void main() => runApp(DemoApp()); class DemoApp extends StatelessWidget{
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'FloatingButton Demo',
debugShowCheckedModeBanner: false,
home: mHomePage(),
);
}
} class mHomePage extends StatefulWidget{
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _mHomePage();
}
} class _mHomePage extends State {
@override
Widget build(BuildContext context) {
// TODO: implement build
return new Scaffold(
body: new Center(
child: _showPopupMenuButton(),
),
appBar: AppBar(
title: new Text('FloatingButton Demo'),
actions: <Widget>[
IconButton(icon: Icon(Icons.search), onPressed: (){
Scaffold.of(context).showSnackBar(new SnackBar(content: new Text('SnackBar')));
})
],
),
drawer: Drawer(
child: ListView(
children: <Widget>[
UserAccountsDrawerHeader(
accountName: new Text('FloatingButton Demo'),
accountEmail: new Text('www.baidu.com'),
currentAccountPicture: new CircleAvatar(
backgroundImage: AssetImage('images/user.jpeg'),
),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
),
ListTile(
title: new Text('我是主标题'),
leading: Icon(Icons.add_circle_outline),
subtitle: new Text('我是副标题'),
)
],
),
),
floatingActionButton: new FloatingActionButton(
child: Icon(Icons.album),
foregroundColor: Colors.amberAccent,
backgroundColor: Colors.deepPurple,
elevation: 10.0,
highlightElevation: 20.0,
mini: false,
onPressed: (){
// _showSimpleDialog(context);
_showAlertDialog(context);
},
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
);
} PopupMenuButton _showPopupMenuButton() {
return PopupMenuButton(
icon: Icon(Icons.menu),
itemBuilder: (BuildContext context) => <PopupMenuEntry>[
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton1"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton2"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton3"),
),
),
const PopupMenuItem(
child: ListTile(
leading: Icon(Icons.add_circle_outline),
title: Text("popupMenuButton4"),
),
),
]
);
} void _showSimpleDialog(BuildContext context) {
showDialog(
context: context,
builder: (BuildContext context){
return SimpleDialog(
title: new Text('SimpleDialog Demo'),
children: <Widget>[
SimpleDialogOption(
child: Text('选项1'),
),
SimpleDialogOption(
child: Text('选项2'),
onPressed: (){
Navigator.pop(context);
},
),
],
);
}
);
} void _showAlertDialog(BuildContext context) {
showDialog(
context: context,
builder: (BuildContext context){
return AlertDialog(
title: new Text('提示'),
content: new Text('这是提示框的内容'),
actions: <Widget>[
FlatButton(onPressed: null, child: new Text('确定'),disabledTextColor: Colors.blueAccent,),
FlatButton(
onPressed: (){
Navigator.pop(context);
Scaffold.of(context).showSnackBar(new SnackBar(content: new Text('SnackBar')));
},
child: new Text('取消'),disabledColor: Colors.deepPurple,),
],
backgroundColor: Colors.amberAccent,
);
}
);
}
}
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