is
Checks if the control is currently in a started or active operational state.
This state is typically achieved after #start() has been successfully called and before #stop() or #dispose() is invoked.
Indicates whether the clock's update mechanism has been started.Return
true if the clock has been started (i.e., start has been called and stop has not been called since), false otherwise. Currently, this always returns true, which might not accurately reflect the state of the handler's runnable.