/// <summary>
/// Create an UndoService.
/// </summary>
/// <param name="getState">Method to get the state of the tracked object</param>
/// <param name="setState">Method to set the state of the tracked object</param>
/// <param name="cap">Capacity of Undo history</param>
public UndoService(GetState <T> getState, SetState <T> setState, int?cap = null)
{
GetState = getState ?? throw new ArgumentNullException(nameof(getState));
SetState = setState ?? throw new ArgumentNullException(nameof(setState));
var stackFactory = new StackFactory <StateRecord <T> >();
_undoStack = stackFactory.MakeStack(cap);
// T currentState;
GetState(out T currentState);
_originalState = currentState;
_currentState = new StateRecord <T> {
State = currentState
};
_redoStack = new StandardStack <StateRecord <T> >();
_undoServiceValidator = new UndoServiceValidator <StateRecord <T> >(_undoStack, _redoStack);
_undoStack.HasItemsChanged += UndoStack_HasItemsChanged;
_redoStack.HasItemsChanged += RedoStack_HasItemsChanged;
}
/// <summary>
/// Creates an aggregate of UndoServices.
/// </summary>
/// <param name="subUndoServices"></param>
public UndoServiceAggregate(IUndoService[] subUndoServices)
{
_undoStack = new IntStackWithDelete();
_redoStack = new IntStackWithDelete();
_subUndoServices = new List <SubUndoService>();
_clearStackInvocationsCount = 0;
if (subUndoServices == null)
{
throw new ArgumentNullException(nameof(subUndoServices));
}
for (var i = 0; i < subUndoServices.Length; i++)
{
AddUndoService(subUndoServices[i]);
}
_undoServiceValidator = new UndoServiceValidator <int>(_undoStack, _redoStack);
_undoStack.HasItemsChanged += UndoStack_HasItemsChanged;
_redoStack.HasItemsChanged += RedoStack_HasItemsChanged;
}