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Description:

pausable timer

pausable_timer #

A Dart
timer that can be
paused, resumed and reset.
Example using start(), pause() and reset() #
import 'package:pausable_timer/pausable_timer.dart';

void main() async {
print('Create a timer that fires in 1 second, but it is not started yet');
final timer = PausableTimer(Duration(seconds: 1), () => print('Fired!'));
print('So we start it');
timer.start();

print('And wait 1/2 second...');
await Future<void>.delayed(timer.duration ~/ 2);
print('Not yet fired, still 1/2 second to go!');

print('We can pause it now');
timer.pause();

// When paused, time can pass but the timer won't be fired
print('And we wait a whole second...');
await Future<void>.delayed(timer.duration);
print("But our timer doesn't care while it's paused");
print('It will still wait for ${timer.duration - timer.elapsed} after '
"it's started again");

print('So we start it again');
timer.start();
print('And wait for 1/2 second again, it should have fired when we are done');
await Future<void>.delayed(timer.duration ~/ 2);
print('And we are done, "Fired!" should be up there 👆');
print('Now our timer completed ${timer.tick} tick');

print('We can reset it if we want to use it again');
timer.reset();
print('We have to start it again after the reset because it was not running');
timer.start();
print('Now we wait a whole second in one go...');
await Future<void>.delayed(timer.duration);
print('And we are done, so you should see "Fired!" up there again 👆');
print('Now the timer has ${timer.tick} ticks');

print('We can reset it and start it again');
timer.reset();
timer.start();

print('And you can cancel it too, so it will not fire again');
timer.cancel();
print("After a timer is cancelled, it can't be used again");
print('But important information can still be retrieved:');
print('duration: ${timer.duration}');
print('elapsed: ${timer.elapsed}');
print('tick: ${timer.tick}');
print('isPaused: ${timer.isPaused}');
print('isActive: ${timer.isActive}');
print('isExpired: ${timer.isExpired}');
print('isCancelled: ${timer.isCancelled}');
}
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Example pausable countdown implementation #
// Example on how to implement countdown using PausableTimer.periodic
import 'dart:async';

import 'package:pausable_timer/pausable_timer.dart';

void main() async {
// We make it "late" to be able to use the timer in the timer's callback.
late final PausableTimer timer;
var countDown = 5;

print('Create a periodic timer that fires every 1 second and starts it');
timer = PausableTimer.periodic(
Duration(seconds: 1),
() {
countDown--;

if (countDown == 0) {
timer.pause();
}

print('\t$countDown');
},
)..start();

print('And wait 2.1 seconds...');
print('(0.1 extra to make sure there is no race between the timer and the '
'waiting here)');
await Future<void>.delayed(timer.duration * 2.1);
print('By now 2 events should have fired: 4, 3\n');

print('We can pause it now');
timer.pause();

print('And we wait for 2 more seconds...');
await Future<void>.delayed(timer.duration * 2);
print("But our timer doesn't care while it's paused\n");

print('So we start it again');
timer.start();
print('And wait for 3.1 seconds more...');
await Future<void>.delayed(timer.duration * 3.1);
print('And we are done: 2, 1 and 0 should have been printed');

print('The timer should be unpaused, inactive, expired and not cancelled');
print('isPaused: ${timer.isPaused}');
print('isActive: ${timer.isActive}');
print('isExpired: ${timer.isExpired}');
print('isCancelled: ${timer.isCancelled}');

print('We can now reset it and start it again, now for 3 seconds');
countDown = 3;
timer
..reset()
..start();
print('And wait for 3.1 seconds...');
await Future<void>.delayed(timer.duration * 3.1);
print('And it should be done printing: 2, 1 and 0');
}
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