public void Redo()
{
var restorePoint = _undoStack.Redo();
restorePoint.Redo(_document);
UndoStackChanged?.Invoke(this, EventArgs.Empty);
}
public void Resize(int newSize)
{
if (newSize == _undoStack.Count)
{
return;
}
newSize = MathC.Clamp(newSize, 1, MaxUndoDepth);
_undoStack.Resize(newSize);
_redoStack.Resize(newSize);
UndoStackChanged?.Invoke(this, new EventArgs());
}
public void Push(List <UndoRedoInstance> instance)
{
if (!StackValid(_undoStack))
{
return;
}
_undoStack.Push(instance);
_redoStack.Clear();
UndoStackChanged?.Invoke(this, new EventArgs());
}
private void Clear(UndoRedoStack stack, bool silent = false)
{
if (!StackValid(stack))
{
return;
}
stack.Clear();
if (!silent)
{
UndoStackChanged?.Invoke(this, new EventArgs());
}
}
private void StoreFullNewState()
{
// stores the entire state of the document as a RestorePoint on the undoredo-stack
var restorePoint = new RestorePoint();
foreach (var layer in _document.Layers)
{
restorePoint.StoreNewState(layer);
}
_undoStack.Add(restorePoint);
UndoStackChanged?.Invoke(this, EventArgs.Empty);
}
private void Engage(UndoRedoStack stack)
{
if (!StackValid(stack))
{
return;
}
var counterStack = stack == _undoStack ? _redoStack : _undoStack;
var instance = stack.Pop();
if (instance == null)
{
return;
}
if (instance.All(item => item.Valid == null || item.Valid()))
{
// Generate and push redo instance, if exists. If not, reset redo stack, since action is irreversible.
var redoList = instance.Where(item => item.RedoInstance != null).ToList().ConvertAll(item => item.RedoInstance());
if (redoList.Count > 0)
{
counterStack.Push(redoList);
}
else
{
counterStack.Clear();
}
// Invoke original undo instance
instance.ForEach(item => item.UndoAction?.Invoke());
}
else
{
MessageSent?.Invoke(this, new UndoManagerMessageEventArgs()
{
Message = "Level state changed. " + (counterStack == _redoStack ? "Undo" : "Redo") + " action ignored."
});
}
UndoStackChanged?.Invoke(this, new EventArgs());
}
public void ClearAll()
{
Clear(_undoStack, true);
Clear(_redoStack, true);
UndoStackChanged?.Invoke(this, new EventArgs());
}
internal void AddRestorePoint(RestorePoint restorePoint)
{
_undoStack.Add(restorePoint);
UndoStackChanged?.Invoke(this, EventArgs.Empty);
}