重构example项目结构
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Kuloud
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import 'package:amap_map_example/base_page.dart';
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import 'package:flutter/material.dart';
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class DemoGroupWidget extends StatefulWidget {
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final String groupLabel;
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final List<BasePage>? itemPages;
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DemoGroupWidget({Key? key, required this.groupLabel, this.itemPages})
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: super(key: key);
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@override
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State<StatefulWidget> createState() => _GroupState();
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}
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class _GroupState extends State<DemoGroupWidget> {
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void _pushPage(BuildContext context, BasePage page) {
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Navigator.of(context).push(MaterialPageRoute<void>(
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builder: (_) => Scaffold(
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appBar: AppBar(title: Text(page.title)),
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body: page,
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)));
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}
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bool _hasItemPages = false;
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@override
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void initState() {
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super.initState();
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if (widget.itemPages != null && widget.itemPages!.length > 0) {
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_hasItemPages = true;
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} else {
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_hasItemPages = false;
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}
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}
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@override
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Widget build(BuildContext context) {
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return Column(
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mainAxisAlignment: MainAxisAlignment.start,
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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ListTile(
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title: Text(
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widget.groupLabel,
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style: TextStyle(fontWeight: FontWeight.w600, fontSize: 18),
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)),
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Divider(height: 1),
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Container(
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padding: EdgeInsets.only(left: 10),
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child: _hasItemPages
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? ListView.separated(
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shrinkWrap: true,
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physics: NeverScrollableScrollPhysics(),
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itemCount: widget.itemPages!.length,
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itemBuilder: (_, int index) => ListTile(
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title: Text(widget.itemPages![index].title),
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subtitle: Text(widget.itemPages![index].subTitle),
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onTap: () => _pushPage(context, widget.itemPages![index]),
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),
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separatorBuilder: (BuildContext context, int index) =>
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Divider(
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height: 1,
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indent: 16,
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),
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)
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: null,
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),
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Divider(height: 1),
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],
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);
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}
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}
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@ -1,136 +0,0 @@
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import 'package:flutter/material.dart';
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//Toast 显示位置控制
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enum ToastPostion {
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top,
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center,
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bottom,
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}
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class Toast {
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// toast靠它加到屏幕上
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static OverlayEntry? _overlayEntry;
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// toast是否正在showing
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static bool _showing = false;
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// 开启一个新toast的当前时间，用于对比是否已经展示了足够时间
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static DateTime? _startedTime;
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// 提示内容
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static String? _msg;
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// toast显示时间
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static int _showTime = 10;
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// 背景颜色
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static Color? _bgColor;
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// 文本颜色
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static Color? _textColor;
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// 文字大小
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static double? _textSize;
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// 显示位置
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static ToastPostion? _toastPosition;
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// 左右边距
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static double? _pdHorizontal;
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// 上下边距
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static double? _pdVertical;
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static void toast(
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BuildContext context, {
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//显示的文本
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String? msg,
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//显示的时间 单位毫秒
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int showTime = 1000,
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//显示的背景
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Color bgColor = Colors.black,
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//显示的文本颜色
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Color textColor = Colors.white,
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//显示的文字大小
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double textSize = 14.0,
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//显示的位置
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ToastPostion position = ToastPostion.center,
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//文字水平方向的内边距
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double pdHorizontal = 20.0,
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//文字垂直方向的内边距
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double pdVertical = 10.0,
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}) async {
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assert(msg != null);
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_msg = msg;
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_startedTime = DateTime.now();
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_showTime = showTime;
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_bgColor = bgColor;
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_textColor = textColor;
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_textSize = textSize;
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_toastPosition = position;
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_pdHorizontal = pdHorizontal;
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_pdVertical = pdVertical;
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//获取OverlayState
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OverlayState overlayState = Overlay.of(context)!;
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_showing = true;
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if (_overlayEntry == null) {
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//OverlayEntry负责构建布局
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//通过OverlayEntry将构建的布局插入到整个布局的最上层
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_overlayEntry = OverlayEntry(
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builder: (BuildContext context) => Positioned(
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//top值，可以改变这个值来改变toast在屏幕中的位置
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top: buildToastPosition(context),
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child: Container(
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alignment: Alignment.center,
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width: MediaQuery.of(context).size.width,
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child: Padding(
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padding: EdgeInsets.symmetric(horizontal: 40.0),
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child: AnimatedOpacity(
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opacity: _showing ? 1.0 : 0.0, //目标透明度
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duration: _showing
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? Duration(milliseconds: 100)
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: Duration(milliseconds: 400),
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child: _buildToastWidget(),
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),
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)),
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));
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//插入到整个布局的最上层
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overlayState.insert(_overlayEntry!);
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} else {
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//重新绘制UI，类似setState
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_overlayEntry!.markNeedsBuild();
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}
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// 等待时间
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await Future.delayed(Duration(milliseconds: _showTime));
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//2秒后 到底消失不消失
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if (DateTime.now().difference(_startedTime!).inMilliseconds >= _showTime) {
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_showing = false;
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_overlayEntry!.markNeedsBuild();
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await Future.delayed(Duration(milliseconds: 400));
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_overlayEntry!.remove();
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_overlayEntry = null;
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}
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}
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//toast绘制
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static _buildToastWidget() {
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return Center(
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child: Card(
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color: _bgColor,
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child: Padding(
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padding: EdgeInsets.symmetric(
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horizontal: _pdHorizontal!, vertical: _pdVertical!),
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child: Text(
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_msg!,
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style: TextStyle(
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fontSize: _textSize,
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color: _textColor,
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),
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),
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),
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),
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);
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}
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// 设置toast位置
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static buildToastPosition(context) {
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var backResult;
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if (_toastPosition == ToastPostion.top) {
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backResult = MediaQuery.of(context).size.height * 1 / 4;
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} else if (_toastPosition == ToastPostion.center) {
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backResult = MediaQuery.of(context).size.height * 2 / 5;
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} else {
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backResult = MediaQuery.of(context).size.height * 3 / 4;
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}
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return backResult;
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}
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}
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