Adam GastineauandGitHub
2ccd0effc8
* chore(mobile): enable dead code CI * Restore accidentally removed test and set mise default
53 lines
1.5 KiB
Dart
53 lines
1.5 KiB
Dart
import 'dart:async';
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/// Used to debounce function calls with the [interval] provided.
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/// If [maxWaitTime] is provided, the first [run] call as well as the next call since [maxWaitTime] has passed will be immediately executed, even if [interval] is not satisfied.
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class Debouncer {
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Debouncer({required this.interval, this.maxWaitTime});
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final Duration interval;
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final Duration? maxWaitTime;
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Timer? _timer;
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FutureOr<void> Function()? _lastAction;
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DateTime? _lastActionTime;
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Future<void>? _actionFuture;
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void run(FutureOr<void> Function() action) {
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_lastAction = action;
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_timer?.cancel();
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if (maxWaitTime != null &&
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// _actionFuture == null && // TODO: should this check be here?
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(_lastActionTime == null || DateTime.now().difference(_lastActionTime!) > maxWaitTime!)) {
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_callAndRest();
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return;
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}
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_timer = Timer(interval, _callAndRest);
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}
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@pragma('vm:prefer-inline')
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void _callAndRest() {
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_lastActionTime = DateTime.now();
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final action = _lastAction;
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_lastAction = null;
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final result = action!();
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if (result is Future) {
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_actionFuture = result.whenComplete(() {
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_actionFuture = null;
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});
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}
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_timer = null;
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}
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void dispose() {
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_timer?.cancel();
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_timer = null;
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_lastAction = null;
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_lastActionTime = null;
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_actionFuture = null;
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}
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// ignore: unused-code
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bool get isActive => _actionFuture != null || (_timer != null && _timer!.isActive);
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}
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