performBatch method

void performBatch(void updates())

Perform several selection updates while emitting at most one notification.

Implementation

void performBatch(void Function() updates) {
  if (_batching) {
    updates();
    return;
  }
  _batching = true;
  try {
    updates();
  } finally {
    _batching = false;
    if (_dirty) {
      _dirty = false;
      notifyListeners();
    }
  }
}