startCounter method

void startCounter()

启动计时Timer.

Implementation

void startCounter() {
  if (_isActive || _interval <= 0) return;
  _isActive = true;
  Duration duration = Duration(milliseconds: _interval);
  _doCallback(_count);
  _mTimer = Timer.periodic(duration, (Timer timer) {
    _count += 1;
    _doCallback(_count);
  });
}