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最新评论
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liangzai_cool:
请教一下,文中,shell、C、Python三种方式控制led ...
树莓派 - MAX7219 -
jiazimo:
...
Kafka源码分析-序列5 -Producer -RecordAccumulator队列分析 -
hp321:
Windows该命令是不是需要安装什么软件才可以?我试过不行( ...
ImageIO读jpg的时候出现javax.imageio.IIOException: Unsupported Image Type -
hp321:
Chenzh_758 写道其实直接用一下代码就可以解决了:JP ...
ImageIO读jpg的时候出现javax.imageio.IIOException: Unsupported Image Type -
huanghonhpeng:
大哥你真强什么都会,研究研究。。。。小弟在这里学到了很多知识。 ...
android 浏览器
Flutter -自定义日历组件
- 博客分类:
- mac/IOS
- android基础知识
颜色文件和屏幕适配的文件 可以自己给定
import 'package:flutter/cupertino.dart'; import 'package:flutter/rendering.dart'; import 'package:flutter_xiaoe/utils/ScreenUtil.dart'; import 'package:flutter/material.dart'; import 'package:flutter_xiaoe/utils/TimeUtil.dart'; import 'package:flutter_xiaoe/widgets/common/calendar/DayGridView.dart'; import 'package:flutter_xiaoe/config/Colors.dart'; class Calendar extends StatefulWidget { DateTime initTime; DateTime firstTime; DateTime endTime; ValueChanged onChange; Calendar({ Key key, this.initTime, this.firstTime, this.endTime, this.onChange, }) : super(key: key); @override State<Calendar> createState() => _CalendarState(); } class _CalendarState extends State<Calendar> { PageController pageController; DateTime selectDate; int initPage = 0; int totalPage = 0; @override void initState() { super.initState(); print(widget.firstTime.month); selectDate = widget.initTime; /// 总共的月份数目 totalPage = (widget.endTime.year - widget.firstTime.year == 0 ? widget.endTime.month : ((widget.endTime.year - widget.firstTime.year) * 12 + widget.endTime.month - widget.firstTime.month + 1)); /// 当前月份处于 initPage = (widget.initTime.year - widget.firstTime.year == 0 ? widget.initTime.month : ((widget.initTime.year - widget.firstTime.year) * 12 + widget.initTime.month - widget.firstTime.month + 1)); print(totalPage); print(initPage); pageController = PageController( initialPage: totalPage, ); } onChange(time) { if (selectDate != time) { setState(() { selectDate = time; widget.onChange(time); }); } } @override Widget build(BuildContext context) { return Column(children: <Widget>[ Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: TimeUtil.getDayHeaders(MaterialLocalizations.of(context)), ), Container( color: AppColors.WHITE, height: ScreenUtil.px2pt(600), child: PageView.builder( itemBuilder: (BuildContext context, int index) { return DayGridView( initDate: DateTime(widget.initTime.year, widget.initTime.month, widget.initTime.day), selectDate: DateTime(selectDate.year, selectDate.month, selectDate.day), year: widget.firstTime.year + ((widget.firstTime.month + index - 1) / 12).floor(), month: (widget.firstTime.month + index) % 12 == 0 ? 12 : (widget.firstTime.month + index) % 12, onChange: onChange, ); }, itemCount: totalPage, controller: pageController, ), ), ]); } }
import 'package:flutter/cupertino.dart'; import 'package:flutter/rendering.dart'; import 'package:flutter_xiaoe/utils/ScreenUtil.dart'; import 'package:flutter_xiaoe/utils/NetUtil.dart'; import 'package:flutter_xiaoe/config/Api.dart'; import 'package:flutter_xiaoe/config/Colors.dart'; import 'package:flutter/material.dart'; import 'dart:math' as math; import 'package:flutter_xiaoe/utils/TimeUtil.dart'; class DayGridView extends StatefulWidget { DateTime initDate; DateTime selectDate; int year; int month; ValueChanged onChange; DayGridView({ Key key, @required this.initDate, @required this.selectDate, @required this.year, @required this.month, this.onChange, }); @override State<DayGridView> createState() => _DayGridViewState(); } class _DayGridViewState extends State<DayGridView> { @override void initState() { super.initState(); } List<Widget> dayItems() { List days = TimeUtil.getDay( widget.year, widget.month, MaterialLocalizations.of(context)); List dayWidgets = days.map((value) { if (value is int) { return Container(); } if (value == widget.selectDate) { return GestureDetector( onTap: () { widget.onChange(widget.selectDate); }, child: Container( color: AppColors.WHITE, alignment: Alignment.center, child: Container( width: ScreenUtil.px2pt(60), height: ScreenUtil.px2pt(60), alignment: Alignment.center, decoration: BoxDecoration( color: AppColors.BLUE_TEXT, borderRadius: BorderRadius.all(Radius.circular(100)), ), child: Text( value.day.toString(), style: TextStyle(color: AppColors.WHITE), ), ), ), ); } else { if (value == widget.initDate) { return GestureDetector( onTap: () { widget.onChange(widget.initDate); }, child: Container( color: AppColors.WHITE, alignment: Alignment.center, child: Text( value.day.toString(), style: TextStyle(color: AppColors.BLUE_TEXT), )), ); } else { if (value.isAfter(widget.initDate)) { /// 在今天之后的时间无法点击 return GestureDetector( child: Container( alignment: Alignment.center, child: Text( value.day.toString(), style: TextStyle(color: AppColors.BLACK3), )), ); } else { /// 在今天之前的时间可以点击 return GestureDetector( onTap: () { widget.onChange(value); }, child: Container( color: AppColors.WHITE, alignment: Alignment.center, child: Container( child: Text( value.day.toString(), style: TextStyle(color: AppColors.BLACK1), ), )), ); } } } }).toList(); return dayWidgets; } @override Widget build(BuildContext context) { List<Widget> list = dayItems(); return Container( height: ScreenUtil.px2pt(600), child: GridView.custom( gridDelegate: _DayPickerGridDelegate(mainAxisNumber: list.length > 35 ? 6 : 5), physics: NeverScrollableScrollPhysics(), padding: EdgeInsets.all(0), childrenDelegate: SliverChildListDelegate(list, addRepaintBoundaries: false)), ); } } /// 自定义GridView class _DayPickerGridDelegate extends SliverGridDelegate { final int mainAxisNumber; const _DayPickerGridDelegate({ this.mainAxisNumber, }); @override SliverGridLayout getLayout(SliverConstraints constraints) { const int columnCount = DateTime.daysPerWeek; final double tileWidth = constraints.crossAxisExtent / columnCount; final double tileHeight = ScreenUtil.px2pt(600) / mainAxisNumber; return SliverGridRegularTileLayout( crossAxisCount: columnCount, mainAxisStride: tileHeight, crossAxisStride: tileWidth, childMainAxisExtent: tileHeight, childCrossAxisExtent: tileWidth, reverseCrossAxis: axisDirectionIsReversed(constraints.crossAxisDirection), ); } @override bool shouldRelayout(_DayPickerGridDelegate oldDelegate) => false; } const _DayPickerGridDelegate _kDayPickerGridDelegate = _DayPickerGridDelegate();
import 'package:flutter/cupertino.dart'; import 'package:flutter_xiaoe/utils/ScreenUtil.dart'; import 'package:flutter_xiaoe/utils/NetUtil.dart'; import 'package:flutter_xiaoe/config/Api.dart'; import 'package:flutter_xiaoe/config/Colors.dart'; import 'package:flutter/material.dart'; import 'package:flutter_xiaoe/widgets/login/ImageInputWidget.dart'; import 'package:flutter_xiaoe/config/Constant.dart'; import 'package:flutter_xiaoe/config/ImageConfig.dart'; import 'package:flutter_xiaoe/widgets/common/ShadowContainer.dart'; import 'package:flutter_xiaoe/widgets/login/GradientButton.dart'; import 'package:flutter_xiaoe/widgets/common/Header.dart'; class TimeUtil { static const List<int> _daysInMonth = <int>[ 31, -1, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ]; /// 获取这个月的天数 static int getDaysInMonth(int year, int month) { if (month == DateTime.february) { final bool isLeapYear = (year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0); if (isLeapYear) return 29; return 28; } return _daysInMonth[month-1]; } /// 获取周Header static List<Widget> getDayHeaders(MaterialLocalizations localizations) { List<Widget> list = []; for (int i = localizations.firstDayOfWeekIndex; true; i = (i + 1) % 7) { final String weekday = localizations.narrowWeekdays[i]; list.add(Flexible( child: Container( height: ScreenUtil.px2pt(80), child: Center( child: Text( weekday, style: TextStyle( color: AppColors.BLACK1, fontSize: ScreenUtil.px2ptFont(34), ), ), ), ))); if (i == (localizations.firstDayOfWeekIndex - 1) % 7) break; } return list; } /// 得到这个月的第一天是星期几(0 是 星期日 1 是 星期一...) static int computeFirstDayOffset( int year, int month, MaterialLocalizations localizations) { // 0-based day of week, with 0 representing Monday. final int weekdayFromMonday = DateTime(year, month).weekday - 1; // 0-based day of week, with 0 representing Sunday. final int firstDayOfWeekFromSunday = localizations.firstDayOfWeekIndex; // firstDayOfWeekFromSunday recomputed to be Monday-based final int firstDayOfWeekFromMonday = (firstDayOfWeekFromSunday - 1) % 7; // Number of days between the first day of week appearing on the calendar, // and the day corresponding to the 1-st of the month. return (weekdayFromMonday - firstDayOfWeekFromMonday) % 7; } /// 获取天 static List getDay(int year, int month, MaterialLocalizations localizations) { List labels = []; final int daysInMonth = getDaysInMonth(year, month); final int firstDayOffset = computeFirstDayOffset(year, month, localizations); for (int i = 0; true; i += 1) { // 1-based day of month, e.g. 1-31 for January, and 1-29 for February on // a leap year. final int day = i - firstDayOffset + 1; if (day > daysInMonth) break; if (day < 1) { labels.add(0); } else { labels.add(DateTime(year, month, day)); } } return labels; } }
发表评论
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带你深入理解 FLUTTER 中的字体“冷”知识
2020-08-10 23:40 565本篇将带你深入理解 Flutter 开发过程中关于字体和文 ... -
Dart高级(一)——泛型与Json To Bean
2020-02-23 19:13 923从 Flutter 发布到现在, 越来越多人开始尝试使用 Da ... -
flutter loading、Progress进度条
2020-02-21 17:03 1029Flutter Progress 1 条形无固定值进度条 ... -
Flutter使用Https加载图片
2020-02-21 01:39 898Flutter使用Https加载图片 使用http加载图片出 ... -
flutter shared_preferences 异步变同步
2020-02-21 00:55 762前言 引用 在开发原生iOS或Native应用时,一般有判断上 ... -
Flutter TextField边框颜色
2020-02-19 21:31 849监听要销毁 myController.dispose(); T ... -
flutter Future的正确用法
2020-02-18 21:55 725在flutter中经常会用到异步任务,dart中异步任务异步处 ... -
记一次Flutter简单粗暴处理HTTPS证书检验方法
2020-02-18 14:13 822最近在做Flutter项目到了遇到一个无解的事情,当使用Ima ... -
flutter 获取屏幕宽度高度 通知栏高度等屏幕信息
2019-07-27 08:39 1223##MediaQuery MediaQuery.of(con ... -
Mac上制作Centos7系统U盘安装盘
2019-07-23 11:25 586Centos7 下载地址: https://www.cento ... -
关于flutter RefreshIndicator扩展listview下拉刷新的问题
2019-07-10 19:40 995当条目过少时listview某些嵌套情况下可能不会滚动(条目 ... -
flutter listview 改变状态的时候一直无限添加
2019-07-10 16:01 671setstate的时候会一直无限的调用listview.bui ... -
Flutter Android端启动白屏问题的解决
2019-07-09 00:51 1399问题描述 Flutter 应用在 Android 端上启动时 ... -
Flutter中SnackBar使用
2019-07-08 23:43 676底部弹出,然后在指定时间后消失。 注意: build(Bui ... -
Flutter 之点击空白区域收起键盘
2019-07-08 18:43 1656点击空白处取消TextField焦点这个需求是非常简单的,在学 ... -
Flutter 弹窗 Dialog ,AlertDialog,IOS风格
2019-07-08 18:04 1287import 'package:flutter/mate ... -
flutter ---TextField 之 输入类型、长度限制
2019-07-08 14:30 2196TextField想要实现输入类型、长度限制需要先引入impo ... -
【flutter 溢出BUG】键盘上显示bottom overflowed by 104 PIXELS
2019-07-08 11:13 1444一开始直接使用Scaffold布局,body:new Colu ... -
解决Flutter项目卡在Initializing gradle...界面的问题
2019-07-07 12:53 787Flutter最近很火,我抽出了一点时间对Flutter进行了 ... -
关于android O 上 NotificationChannel 的一些注意事项
2019-07-04 11:47 884最近在适配android O,遇到个问题,应用中原本有设置界面 ...
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