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87 lines
2.5 KiB
Dart
87 lines
2.5 KiB
Dart
/**
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* Created with Android Studio.
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* User: ryan
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* Date: 2019/1/2
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* Time: 上午12:07
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* email: zhu.yan@alibaba-inc.com
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* tartget: SnackBar 的示例
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*/
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import 'dart:math';
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import 'package:flutter/material.dart';
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/*
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* Checkbox 默认按钮的实例
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* index 当前checkbox 的索引值
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* */
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class SnackBarFullDefault extends StatefulWidget {
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const SnackBarFullDefault() : super();
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@override
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State<StatefulWidget> createState() => _SnackBarFullDefault();
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}
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/*
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* SnackBar 默认的实例,有状态
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* */
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class _SnackBarFullDefault extends State {
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@override
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Widget build(BuildContext context) {
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return SnackBar(
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// ... // 如果没有,就是不需要有状态的 StatefulWidget
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);
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}
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}
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/*
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* SnackBar 默认的实例,无状态
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* */
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class SnackBarLessDefault extends StatelessWidget {
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final widget;
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final parent;
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const SnackBarLessDefault([this.widget, this.parent])
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: super();
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@override
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Widget build(BuildContext context) {
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// 当BuildContext在Scaffold之前时，调用Scaffold.of(context)会报错。这时可以通过Builder Widget来解决
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return new Center(
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child: new Column(
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children: <Widget>[
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new GestureDetector(
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onTap: () {
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final snackBar = new SnackBar(
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content: new Text('这是一个SnackBar, 右侧有SnackBarAction'),
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backgroundColor:Colors.red,
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action: new SnackBarAction( // 提示信息上添加一个撤消的按钮
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textColor:Colors.black,
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label: '撤消',
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onPressed: () {
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// Some code to undo the change!
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},
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),
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duration:Duration(minutes: 1),// 持续时间
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//animation,
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);
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Scaffold.of(context).showSnackBar(snackBar);
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},
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child: new Text('显示SnackBar'),
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),
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new GestureDetector(
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onTap: () {
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final snackBar = new SnackBar(
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content: new Text('右侧无SnackBarAction'),
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backgroundColor:Colors.red,
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duration:Duration(minutes: 1),// 持续时间
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//animation,
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);
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Scaffold.of(context).showSnackBar(snackBar);
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},
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child: new Text('显示无SnackBarAction的SnackBar'),
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),
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],
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)
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);
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}
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} |