add method

void add(int count)

Implementation

void add(int count) {
  var v = value == null ? 0 : value!;

  if (v + count >= min && v + count <= max) {
    v += count;
    if (_onChange != null) {
      _onChange!(v);
    }
    value = v;
    _changeDetectorRef.markForCheck();
  }
}