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93 lines
2.7 KiB
Dart
93 lines
2.7 KiB
Dart
/**
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* Created with Android Studio.
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* User: ryan
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* Date: 2018/12/27
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* Time: 下午6:28
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* email: zhu.yan@alibaba-inc.com
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* tartget: BottomNavigationBar 的示例
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*/
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import 'package:flutter/material.dart';
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import 'package:flutter_go/components/widget_demo.dart';
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import 'package:flutter_markdown/flutter_markdown.dart';
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import './demo.dart' as BottomNavigationBarDemo;
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const String _text0 =
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"""### **简介**
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> BottomNavigationBar “底部导航栏”
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- 显示在应用程序底部的导航栏,由文本标签，图标或两者形式的多个项目组成;
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- 它提供了应用程序顶级视图之间的快速导航;
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""";
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const String _text1 =
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"""### **基本用法**
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> BottomNavigationBar 底部导航栏通常与Scaffold结合使用
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- 它作为 Scaffold.bottomNavigationBar 参数;
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- BottomNavigationBar 3-5个之间个底部按钮数量是合理的，理论上 icon 大小合适，可以支持更多;
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- 默认0-3个底部按钮数量时，BottomNavigationBar采用fixed的模式摆放底部按钮，当有4个时默认使用 BottomNavigationBarType.shifting 模式摆放底部按钮;
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- 下面的底部导航即是效果;
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""";
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class Demo extends StatefulWidget {
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static const String routeName = '/components/Navigation/BottomNavigationBar';
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@override
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_DemoState createState() => _DemoState();
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}
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class _DemoState extends State<Demo> {
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@override
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Widget build(BuildContext context) {
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return WidgetDemo(
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title: 'BottomNavigationBar',
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codeUrl: 'components/Navigation/BottomNavigationBar/demo.dart',
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contentList: [allDemoBoxs(context, this)],
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docUrl: 'https://docs.flutter.io/flutter/material/BottomNavigationBar-class.html',
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bottomNaviBar:BottomNavigationBarDemo.BottomNavigationBarFullDefault()
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);
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}
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}
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/*
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* 所有的 BottomNavigationBar widget
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* context: 运行上下文
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* that: 指向有状态的 StatefulWidget
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*/
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Widget allDemoBoxs(BuildContext context, _DemoState that) {
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return Container(
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//padding: EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
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child: Column(
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//mainAxisSize: MainAxisSize.max,
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children: <Widget>[
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MarkdownBody(data: _text0),
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textAlignBar(_text1),
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Row(
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mainAxisAlignment: MainAxisAlignment.spaceAround,
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mainAxisSize: MainAxisSize.max,
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children: [
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//BottomNavigationBarDemo.BottomNavigationBarFullDefault();
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],
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),
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SizedBox(width: 20.0), // 间距
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])
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);
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}
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/*
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* 带align的text
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* */
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Widget textAlignBar(String txt) {
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return Align(
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alignment: FractionalOffset.centerLeft,
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child: Column(
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children: <Widget>[
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SizedBox(height: 20.0),
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MarkdownBody(data: txt)
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])
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);
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}
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