A countdown timer that can be configured to fire once or repeatedly.
The timer counts down from the specified duration to 0. When the timer reaches 0, the timer invokes the specified callback function. Use a periodic timer to repeatedly count down the same interval.
A negative duration is treated the same as Duration.zero. If the duration is statically known to be 0, consider using run.
void main() {
Timer(const Duration(seconds: 5), handleTimeout);
}
void handleTimeout() { // callback function
// Do some work.
}
Note: If Dart code using Timer is compiled to JavaScript, the finest granularity available in the browser is 4 milliseconds.
See also:
- Stopwatch for measuring elapsed time.
- Annotations
-
- @vmIsolateUnsendable
Constructors
- Timer(Duration duration, void callback())
-
Creates a new timer.
factory
- Timer.periodic(Duration duration, void callback(Timer timer))
-
Creates a new repeating timer.
factory
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- isActive → bool
-
Returns whether the timer is still active.
no setter
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- tick → int
-
The number of durations preceding the most recent timer event.
no setter
Methods
-
cancel(
) → void - Cancels the timer.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Static Methods
-
run(
void callback()) → void -
Runs the given
callbackasynchronously as soon as possible.