edit method

Implementation

bool edit() {
  final editingSrc = !_editing &&
      dataSet != null &&
      !dsEditModes.contains(dataSet!.state);

  if (!_editing && canModify) {
    super.edit();
  }

  final result = _editing;

  if (!_editingSourceSet) {
    // Fires only once (when the edit succeeds)
    _editingSource = _editing && editingSrc;
    _editingSourceSet = true;
  }
  return result;
}