fluffychat/lib/utils/date_time_extension.dart
2020-05-13 13:58:59 +00:00

99 lines
3.1 KiB
Dart

import 'package:fluffychat/l10n/l10n.dart';
import 'package:flutter/material.dart';
/// Provides extra functionality for formatting the time.
extension DateTimeExtension on DateTime {
bool operator <(DateTime other) {
return millisecondsSinceEpoch < other.millisecondsSinceEpoch;
}
bool operator >(DateTime other) {
return millisecondsSinceEpoch > other.millisecondsSinceEpoch;
}
bool operator >=(DateTime other) {
return millisecondsSinceEpoch >= other.millisecondsSinceEpoch;
}
bool operator <=(DateTime other) {
return millisecondsSinceEpoch <= other.millisecondsSinceEpoch;
}
/// 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.
static final minutesBetweenEnvironments = 5;
/// 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) {
return L10n.of(context).timeOfDay(
_z(hour % 12), _z(hour), _z(minute), hour > 11 ? 'pm' : 'am');
}
/// 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) {
var now = DateTime.now();
var sameYear = now.year == year;
var sameDay = sameYear && now.month == month && now.day == day;
var sameWeek = sameYear &&
!sameDay &&
now.millisecondsSinceEpoch - millisecondsSinceEpoch <
1000 * 60 * 60 * 24 * 7;
if (sameDay) {
return localizedTimeOfDay(context);
} else if (sameWeek) {
switch (weekday) {
case 1:
return L10n.of(context).monday;
case 2:
return L10n.of(context).tuesday;
case 3:
return L10n.of(context).wednesday;
case 4:
return L10n.of(context).thursday;
case 5:
return L10n.of(context).friday;
case 6:
return L10n.of(context).saturday;
case 7:
return L10n.of(context).sunday;
}
} else if (sameYear) {
return L10n.of(context).dateWithoutYear(
month.toString().padLeft(2, '0'), day.toString().padLeft(2, '0'));
}
return L10n.of(context).dateWithYear(year.toString(),
month.toString().padLeft(2, '0'), day.toString().padLeft(2, '0'));
}
/// If the DateTime is today, this returns [localizedTimeOfDay()], if not it also
/// shows the date.
/// TODO: Add localization
String localizedTime(BuildContext context) {
var now = DateTime.now();
var sameYear = now.year == year;
var sameDay = sameYear && now.month == month && now.day == day;
if (sameDay) return localizedTimeOfDay(context);
return L10n.of(context).dateAndTimeOfDay(
localizedTimeShort(context), localizedTimeOfDay(context));
}
static String _z(int i) => i < 10 ? '0${i.toString()}' : i.toString();
}