本文主要介绍了Flutter仿钉钉考勤日历的示例代码,分享给大家,具体如下:
效果
原型
开发
1. 使用
// 考勤日历
DatePickerDialog(
initialDate: DateTime.now(),
firstDate: DateTime(2020),
lastDate: DateTime(2030),
onDateChanged: onDateChanged,
// 0:无状态,1:正常考勤 2:异常考情,迟到,早退,
// 若不满一个月,日历会自动用0补满一个月
checking: [
0,
0,
1,
2,
],
),
DatePickerDialog是在存在与Flutter的material包中,Flutter自带的日历是以dialog形式存在的,本文将dialog改成StatefulWidget直接在页面中,将多余东西去掉,直接在material/calendar_date_picker.dart中_DayPicker上进行修改。
2. 修改日历中日期样式:
Widget dayWidget = Container(
margin: EdgeInsets.all(4.0),
decoration: decoration,
alignment: Alignment.center,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(localizations.formatDecimal(day),
style: TextStyle(
fontSize: 14.0,
color: dayColor,
fontWeight: FontWeight.bold)),
Visibility(
visible: checking[day - 1] == 1 || checking[day - 1] == 2,
child: Container(
height: 6.0,
width: 6.0,
decoration: BoxDecoration(
shape: BoxShape.circle,
color: isSelectedDay ? Colors.white :
(checking[day - 1] == 1 ? Color(0xFF1376EE): Color(0xFFFF8A21)),
),
),
),
],
),
);
Visibility原来没有,是修改加上去的,主要是显示当天打卡状态,若打卡正常则在日期显示下方显示蓝色小点,若有异常则显示橙色的点,若没有状态就不显示,checking则是使用DatePickerDialog传入的,由于日历从1开始,数组是从索引0开始的,所以使用checking[day - 1]才能准确获取某一日的打卡状态,day 则是日历中某一月中所有日期。
3.设置星期标题
修改后:
List<Widget> _dayHeaders() {
final List<Widget> result = <Widget>[];
final List<String> weekdays = ["日", "一", "二", "三", "四", "五", "六"];
for (int i = 1; true; i = (i + 1) % 7) {
final String weekday = weekdays[i];
result.add(ExcludeSemantics(
child: Center(
child: Text(weekday,
style: TextStyle(fontSize: 14.0, color: Color(0xFF999999)))),
));
if (i == (1 - 1) % 7) break;
}
return result;
}
原文:
List<Widget> _dayHeaders(TextStyle? headerStyle, MaterialLocalizations localizations) {
final List<Widget> result = <Widget>[];
for (int i = localizations.firstDayOfWeekIndex; true; i = (i + 1) % 7) {
final String weekday = localizations.narrowWeekdays[i];
result.add(ExcludeSemantics(
child: Center(child: Text(weekday, style: headerStyle)),
));
if (i == (localizations.firstDayOfWeekIndex - 1) % 7)
break;
}
return result;
}
localizations.firstDayOfWeekIndex返回值为0或者1,若返回0,则星期日为每周的第一天;若返回1,则星期一为每周的第一天。本文中没有从localizations.firstDayOfWeekIndex获取,直接赋值为1,则每周从星期一开始。
4.补全每个月空白日期:
获取指定月份有多少天
static int getDaysInMonth(int year, int month) {
if(month < 1){
year = year - 1;
month = month + 12;
}
if(month > 12){
year = year + 1;
month = month - 12;
}
if (month == DateTime.february) {
final bool isLeapYear = (year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0);
return isLeapYear ? 29 : 28;
}
const List<int> daysInMonth = <int>[31, -1, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
return daysInMonth[month - 1];
}
获取指定月份1日的偏移量,即每个月第一天是星期几,若1号是星期3,因为日历每周是从第一天开始的,所以第一周的星期的星期一,星期二为空白,需要补全上个月的倒数后两天,所以还需要获取上个月的最后两天是哪两天。
// 获取日期偏移
static int firstDayOffsets(int year, int month) {
final int weekdayFromMonday = DateTime(year, month).weekday - 1;
int firstDayOfWeekIndex = 1;
firstDayOfWeekIndex = (firstDayOfWeekIndex - 1) % 7;
return (weekdayFromMonday - firstDayOfWeekIndex) % 7;
}
...
// 补全开始日期
int day = -dayOffset;
while (day < daysInMonth) {
day++;
if (day < 1) {
dayItems.add(Container(
margin: EdgeInsets.all(4.0),
alignment: Alignment.center,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
// daysInPreMonth上个月的天数-本月日期偏移则可把本月开始缺失的日期补全
Text(localizations.formatDecimal(daysInPreMonth - day.abs()),
style: TextStyle(
fontSize: 14.0,
color: Color(0xFF888888),
fontWeight: FontWeight.bold)),
Visibility(
visible: false,
child: Container(
height: 6.0,
width: 6.0,
decoration: BoxDecoration(
shape: BoxShape.circle,
color: Color(0xFFFF8A21),
),
),
),
],
),
));
} else {
...
}
...
}
}
补全日历结束日期,每个月最后一天若为星期日,则无需补全,若为星期五则把下个月的前两天补在本月的星期六和星期日:
if ((daysInMonth + dayOffset) % 7 > 0) {
// 计算需要补多少天,直接从1开始就好
int addNum = 7 - ((daysInMonth + dayOffset) % 7);
for (int i = 1; i <= addNum; i++) {
dayItems.add(Container(
margin: EdgeInsets.all(4.0),
alignment: Alignment.center,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(localizations.formatDecimal(i),
style: TextStyle(
fontSize: 14.0,
color: Color(0xFF888888),
fontWeight: FontWeight.bold)),
Visibility(
visible: false,
child: Container(
height: 6.0,
width: 6.0,
decoration: BoxDecoration(
shape: BoxShape.circle,
color: Color(0xFFFF8A21),
),
),
),
],
),
));
}
}
计算每个月从星期一开始展示可以展示几行,即计算日历高度,月份不同,高度不同,最少4行,最多6行,根据内容动态显示不至于留大量空白
// 计算一个月有多少天
int daysInMonth = ChinaDateUtils.getDaysInMonth(
widget.initialDate.year, widget.initialDate.month);
// 计算每个月第一天的星期
int dayOffset = ChinaDateUtils.firstDayOffsets(
widget.initialDate.year, widget.initialDate.month);
// 计算用多少行展示所有日期
int row = ((daysInMonth + dayOffset) / 7).ceil();
修改这些内容大概可以实现上述效果。
Demo地址:https://gitee.com/masshub/sign_in
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