fluffychat/lib/utils/chat_time.dart

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/*
* Copyright (c) 2019 Zender & Kurtz GbR.
*
* Authors:
* Christian Pauly <krille@famedly.com>
* Marcel Radzio <mtrnord@famedly.com>
*
* This file is part of famedlysdk.
*
* famedlysdk is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* famedlysdk is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with famedlysdk. If not, see <http://www.gnu.org/licenses/>.
*/
/// Used to localize and present time in a chat application manner.
class ChatTime {
DateTime dateTime = DateTime.now();
/// Insert with a timestamp [ts] which represents the milliseconds since
/// the Unix epoch.
ChatTime(DateTime ts) {
if (ts != null) dateTime = ts;
}
/// Returns a ChatTime object which represents the current time.
ChatTime.now() {
dateTime = DateTime.now();
}
/// Returns [toTimeString()] if the ChatTime is today, the name of the week
/// day if the ChatTime is this week and a date string else.
String toString() {
DateTime now = DateTime.now();
bool sameYear = now.year == dateTime.year;
bool sameDay =
sameYear && now.month == dateTime.month && now.day == dateTime.day;
bool sameWeek = sameYear &&
!sameDay &&
now.millisecondsSinceEpoch - dateTime.millisecondsSinceEpoch <
1000 * 60 * 60 * 24 * 7;
if (sameDay) {
return toTimeString();
} else if (sameWeek) {
switch (dateTime.weekday) {
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:
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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}
} else if (sameYear) {
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return "${dateTime.month.toString().padLeft(2, '0')}-${dateTime.day.toString().padLeft(2, '0')}";
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}
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return "${dateTime.year.toString()}-${dateTime.month.toString().padLeft(2, '0')}-${dateTime.day.toString().padLeft(2, '0')}";
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}
/// Returns the milliseconds since the Unix epoch.
num toTimeStamp() {
return dateTime.millisecondsSinceEpoch;
}
operator <(ChatTime other) {
return this.toTimeStamp() < other.toTimeStamp();
}
operator >(ChatTime other) {
return this.toTimeStamp() > other.toTimeStamp();
}
operator >=(ChatTime other) {
return this.toTimeStamp() >= other.toTimeStamp();
}
operator <=(ChatTime other) {
return this.toTimeStamp() <= other.toTimeStamp();
}
/// Two message events can belong to the same environment. That means that they
/// don't need to display the time they were sent because they are close
/// enaugh.
static final minutesBetweenEnvironments = 5;
/// Checks if two ChatTimes are close enough to belong to the same
/// environment.
bool sameEnvironment(ChatTime prevTime) {
return toTimeStamp() - prevTime.toTimeStamp() <
1000 * 60 * minutesBetweenEnvironments;
}
/// Returns a simple time String.
String toTimeString() {
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return "${_z(dateTime.hour % 12)}:${_z(dateTime.minute)} ${dateTime.hour > 11 ? 'pm' : 'am'}";
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}
/// If the ChatTime is today, this returns [toTimeString()], if not it also
/// shows the date.
String toEventTimeString() {
DateTime now = DateTime.now();
bool sameYear = now.year == dateTime.year;
bool sameDay =
sameYear && now.month == dateTime.month && now.day == dateTime.day;
if (sameDay) return toTimeString();
return "${toString()}, ${toTimeString()}";
}
static String _z(int i) => i < 10 ? "0${i.toString()}" : i.toString();
}