102 lines
3.2 KiB
Dart
102 lines
3.2 KiB
Dart
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import 'package:flutter/material.dart';
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/// Provides extra functionality for formatting the time.
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extension DateTimeExtension on DateTime {
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@Deprecated('Use [millisecondsSinceEpoch] instead.')
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num toTimeStamp() => this.millisecondsSinceEpoch;
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@deprecated
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String toTimeString() => localizedTimeOfDay(null);
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@deprecated
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String toEventTimeString() => localizedTime(null);
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operator <(DateTime other) {
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return this.millisecondsSinceEpoch < other.millisecondsSinceEpoch;
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}
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operator >(DateTime other) {
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return this.millisecondsSinceEpoch > other.millisecondsSinceEpoch;
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}
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operator >=(DateTime other) {
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return this.millisecondsSinceEpoch >= other.millisecondsSinceEpoch;
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}
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operator <=(DateTime other) {
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return this.millisecondsSinceEpoch <= other.millisecondsSinceEpoch;
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}
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/// Two message events can belong to the same environment. That means that they
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/// don't need to display the time they were sent because they are close
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/// enaugh.
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static final minutesBetweenEnvironments = 5;
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/// Checks if two DateTimes are close enough to belong to the same
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/// environment.
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bool sameEnvironment(DateTime prevTime) {
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return millisecondsSinceEpoch - prevTime.millisecondsSinceEpoch <
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1000 * 60 * minutesBetweenEnvironments;
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}
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/// Returns a simple time String.
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/// TODO: Add localization
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String localizedTimeOfDay(BuildContext context) {
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return "${_z(this.hour % 12)}:${_z(this.minute)} ${this.hour > 11 ? 'pm' : 'am'}";
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}
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/// Returns [localizedTimeOfDay()] if the ChatTime is today, the name of the week
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/// day if the ChatTime is this week and a date string else.
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String localizedTimeShort(BuildContext context) {
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DateTime now = DateTime.now();
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bool sameYear = now.year == this.year;
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bool sameDay = sameYear && now.month == this.month && now.day == this.day;
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bool sameWeek = sameYear &&
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!sameDay &&
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now.millisecondsSinceEpoch - this.millisecondsSinceEpoch <
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1000 * 60 * 60 * 24 * 7;
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if (sameDay) {
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return localizedTimeOfDay(context);
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} else if (sameWeek) {
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switch (this.weekday) {
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case 1:
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return "Monday";
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case 2:
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return "Tuesday";
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case 3:
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return "Wednesday";
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case 4:
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return "Thursday";
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case 5:
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return "Friday";
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case 6:
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return "Saturday";
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case 7:
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return "Sunday";
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}
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} else if (sameYear) {
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return "${this.month.toString().padLeft(2, '0')}-${this.day.toString().padLeft(2, '0')}";
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}
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return "${this.year.toString()}-${this.month.toString().padLeft(2, '0')}-${this.day.toString().padLeft(2, '0')}";
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}
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/// If the DateTime is today, this returns [localizedTimeOfDay()], if not it also
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/// shows the date.
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/// TODO: Add localization
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String localizedTime(BuildContext context) {
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DateTime now = DateTime.now();
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bool sameYear = now.year == this.year;
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bool sameDay = sameYear && now.month == this.month && now.day == this.day;
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if (sameDay) return localizedTimeOfDay(context);
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return "${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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}
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