muted property
Whether this ticker has been silenced.
While silenced, a ticker's clock can still run, but the callback will not be called.
Implementation
bool get muted => _muted;When set to true, silences the ticker, so that it is no longer ticking. If a tick is already scheduled, it will unschedule it. This will not unschedule the next frame, though.
When set to false, unsilences the ticker, potentially scheduling a frame to handle the next tick.
By convention, the muted property is controlled by the object that created the Ticker (typically a TickerProvider), not the object that listens to the ticker's ticks.
Implementation
set muted(bool value) {
  if (value == muted) {
    return;
  }
  _muted = value;
  if (value) {
    unscheduleTick();
  } else if (shouldScheduleTick) {
    scheduleTick();
  }
}