createTicker method Null safety
- 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) {
_tickers ??= <_TestTicker>{};
final _TestTicker result = _TestTicker(onTick, _removeTicker);
_tickers!.add(result);
return result;
}