fluffychat/lib/utils/date_time_extension.dart
2020-01-09 12:16:34 +01:00

102 lines
3.2 KiB
Dart

import 'package:flutter/material.dart';
/// Provides extra functionality for formatting the time.
extension DateTimeExtension on DateTime {
@Deprecated('Use [millisecondsSinceEpoch] instead.')
num toTimeStamp() => this.millisecondsSinceEpoch;
@deprecated
String toTimeString() => localizedTimeOfDay(null);
@deprecated
String toEventTimeString() => localizedTime(null);
operator <(DateTime other) {
return this.millisecondsSinceEpoch < other.millisecondsSinceEpoch;
}
operator >(DateTime other) {
return this.millisecondsSinceEpoch > other.millisecondsSinceEpoch;
}
operator >=(DateTime other) {
return this.millisecondsSinceEpoch >= other.millisecondsSinceEpoch;
}
operator <=(DateTime other) {
return this.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 "${_z(this.hour % 12)}:${_z(this.minute)} ${this.hour > 11 ? 'pm' : 'am'}";
}
/// Returns [localizedTimeOfDay()] if the ChatTime is today, the name of the week
/// day if the ChatTime is this week and a date string else.
String localizedTimeShort(BuildContext context) {
DateTime now = DateTime.now();
bool sameYear = now.year == this.year;
bool sameDay = sameYear && now.month == this.month && now.day == this.day;
bool sameWeek = sameYear &&
!sameDay &&
now.millisecondsSinceEpoch - this.millisecondsSinceEpoch <
1000 * 60 * 60 * 24 * 7;
if (sameDay) {
return localizedTimeOfDay(context);
} else if (sameWeek) {
switch (this.weekday) {
case 1:
return "Monday";
case 2:
return "Tuesday";
case 3:
return "Wednesday";
case 4:
return "Thursday";
case 5:
return "Friday";
case 6:
return "Saturday";
case 7:
return "Sunday";
}
} else if (sameYear) {
return "${this.month.toString().padLeft(2, '0')}-${this.day.toString().padLeft(2, '0')}";
}
return "${this.year.toString()}-${this.month.toString().padLeft(2, '0')}-${this.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) {
DateTime now = DateTime.now();
bool sameYear = now.year == this.year;
bool sameDay = sameYear && now.month == this.month && now.day == this.day;
if (sameDay) return localizedTimeOfDay(context);
return "${localizedTimeShort(context)}, ${localizedTimeOfDay(context)}";
}
static String _z(int i) => i < 10 ? "0${i.toString()}" : i.toString();
}