createTicker method
- TickerCallback onTick
override
Creates a ticker with the given callback.
The kind of ticker provided depends on the kind of ticker provider.
Implementation
@override
Ticker createTicker(TickerCallback onTick) {
assert(() {
if (_ticker == null) {
return true;
}
throw FlutterError.fromParts(<DiagnosticsNode>[
ErrorSummary('$runtimeType is a SingleTickerProviderStateMixin but multiple tickers were created.'),
ErrorDescription('A SingleTickerProviderStateMixin can only be used as a TickerProvider once.'),
ErrorHint(
'If a State is used for multiple AnimationController objects, or if it is passed to other '
'objects and those objects might use it more than one time in total, then instead of '
'mixing in a SingleTickerProviderStateMixin, use a regular TickerProviderStateMixin.',
),
]);
}());
_ticker = Ticker(onTick, debugLabel: kDebugMode ? 'created by ${describeIdentity(this)}' : null);
_updateTickerModeNotifier();
_updateTicker(); // Sets _ticker.mute correctly.
return _ticker!;
}