fluffychat/lib/utils/date_time_extension.dart

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//@dart=2.12
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import 'package:flutter/material.dart';
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import 'package:flutter_gen/gen_l10n/l10n.dart';
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/// Provides extra functionality for formatting the time.
extension DateTimeExtension on DateTime {
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bool operator <(DateTime other) {
return millisecondsSinceEpoch < other.millisecondsSinceEpoch;
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}
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bool operator >(DateTime other) {
return millisecondsSinceEpoch > other.millisecondsSinceEpoch;
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}
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bool operator >=(DateTime other) {
return millisecondsSinceEpoch >= other.millisecondsSinceEpoch;
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}
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bool operator <=(DateTime other) {
return millisecondsSinceEpoch <= other.millisecondsSinceEpoch;
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}
/// Two message events can belong to the same environment. That means that they
/// don't need to display the time they were sent because they are close
/// enaugh.
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static const minutesBetweenEnvironments = 5;
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/// Checks if two DateTimes are close enough to belong to the same
/// environment.
bool sameEnvironment(DateTime prevTime) {
return millisecondsSinceEpoch - prevTime.millisecondsSinceEpoch <
1000 * 60 * minutesBetweenEnvironments;
}
/// Returns a simple time String.
/// TODO: Add localization
String localizedTimeOfDay(BuildContext context) {
if (MediaQuery.of(context).alwaysUse24HourFormat) {
return '${_z(hour)}:${_z(minute)}';
} else {
return '${_z(hour % 12 == 0 ? 12 : hour % 12)}:${_z(minute)} ${hour > 11 ? "pm" : "am"}';
}
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}
/// Returns [localizedTimeOfDay()] if the ChatTime is today, the name of the week
/// day if the ChatTime is this week and a date string else.
String localizedTimeShort(BuildContext context) {
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final now = DateTime.now();
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final sameYear = now.year == year;
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final sameDay = sameYear && now.month == month && now.day == day;
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final sameWeek = sameYear &&
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!sameDay &&
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now.millisecondsSinceEpoch - millisecondsSinceEpoch <
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1000 * 60 * 60 * 24 * 7;
if (sameDay) {
return localizedTimeOfDay(context);
} else if (sameWeek) {
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switch (weekday) {
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case 1:
return L10n.of(context)!.monday;
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case 2:
return L10n.of(context)!.tuesday;
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case 3:
return L10n.of(context)!.wednesday;
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case 4:
return L10n.of(context)!.thursday;
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case 5:
return L10n.of(context)!.friday;
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case 6:
return L10n.of(context)!.saturday;
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case 7:
return L10n.of(context)!.sunday;
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}
} else if (sameYear) {
return L10n.of(context)!.dateWithoutYear(
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month.toString().padLeft(2, '0'), day.toString().padLeft(2, '0'));
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}
return L10n.of(context)!.dateWithYear(year.toString(),
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month.toString().padLeft(2, '0'), day.toString().padLeft(2, '0'));
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}
/// If the DateTime is today, this returns [localizedTimeOfDay()], if not it also
/// shows the date.
/// TODO: Add localization
String localizedTime(BuildContext context) {
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final now = DateTime.now();
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final sameYear = now.year == year;
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final sameDay = sameYear && now.month == month && now.day == day;
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if (sameDay) return localizedTimeOfDay(context);
return L10n.of(context)!.dateAndTimeOfDay(
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localizedTimeShort(context), localizedTimeOfDay(context));
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}
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static String _z(int i) => i < 10 ? '0${i.toString()}' : i.toString();
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}