createUndoableNoParamNoResult<TUndoState> static method

Command<void, void> createUndoableNoParamNoResult<TUndoState>(Future action(UndoStack<TUndoState>), { required UndoFn<TUndoState, void> undo, bool undoOnExecutionFailure = true, ValueListenable<bool>? restriction, void ifRestrictedExecuteInstead()?, ErrorFilter? errorFilter = const ErrorHandlerLocal(), bool notifyOnlyWhenValueChanges = false, String? debugName, })

Creates an undoable Command for an asynchronous handler function with no parameter and no return type action : handler function Can't be used with an ValueListenableBuilder because it doesn't have a value, but you can register a handler to wait for the completion of the wrapped function. undo : function that undoes the action. undoOnExecutionFailure : if true the undo function will be executed automatically if the action fails. restriction : ValueListenable<bool> that can be used to enable/disable the command based on some other state change. true means that the Command cannot be executed. If omitted the command can be executed always except it's already executing ifRestrictedExecuteInstead if restriction is set for the command and its value is true this function will be called instead of the wrapped function. This is useful if you want to execute a different function when the command is restricted. For example you could show a dialog to let the user logg in if the restriction is because the user is not logged in. If you don't set this function, the command will just do nothing when it's restricted. errorFilter : overrides the default set by errorFilterDefault. If false, Exceptions thrown by the wrapped function won't be caught but rethrown unless there is a listener on errors or results. notifyOnlyWhenValueChanges : the default is that the command notifies it's listeners even if the value hasn't changed. If you set this to true the command will only notify it's listeners if the value has changed. debugName optional identifier that is included when you register a globalExceptionHandler or a loggingHandler

Implementation

static Command<void, void> createUndoableNoParamNoResult<TUndoState>(
  Future Function(UndoStack<TUndoState>) action, {
  required UndoFn<TUndoState, void> undo,
  bool undoOnExecutionFailure = true,
  ValueListenable<bool>? restriction,
  void Function()? ifRestrictedExecuteInstead,
  ErrorFilter? errorFilter = const ErrorHandlerLocal(),
  bool notifyOnlyWhenValueChanges = false,
  String? debugName,
}) {
  return UndoableCommand<void, void, TUndoState>(
    funcNoParam: action,
    undo: undo,
    initialValue: null,
    restriction: restriction,
    ifRestrictedExecuteInstead: ifRestrictedExecuteInstead != null
        ? (_) => ifRestrictedExecuteInstead()
        : null,
    undoOnExecutionFailure: undoOnExecutionFailure,
    includeLastResultInCommandResults: false,
    noReturnValue: true,
    errorFilter: errorFilter,
    notifyOnlyWhenValueChanges: notifyOnlyWhenValueChanges,
    debugName: debugName,
    noParamValue: true,
  );
}