public static void Do <T>(this UndoRedoState <T> undoRedoState, IEnumerable <T> items)
{
Assert.IsNotNull(undoRedoState);
Assert.IsNotNull(items);
var unprocessedItemCount = undoRedoState.GetUnprocessedItemCount();
if (unprocessedItemCount > 0)
{
undoRedoState.Items.RemoveRange(undoRedoState.ProcessedItemCount, unprocessedItemCount);
}
var itemList = items.ToList();
undoRedoState.Items.AddRange(itemList);
undoRedoState.ProcessedItemCount += itemList.Count;
}
public static void Undo <T>(this UndoRedoState <T> undoRedoState, int itemCount, Action <IReadOnlyList <T> > process)
{
Assert.IsNotNull(undoRedoState);
Assert.IsInRange(itemCount > 0);
Assert.IsNotNull(process);
if (undoRedoState.ProcessedItemCount < itemCount)
{
throw new InvalidOperationException("Nincs meg a megadott darabszámú visszavonható művelet.");
}
var processedItemCount = undoRedoState.ProcessedItemCount - itemCount;
var items = undoRedoState.Items.Take(processedItemCount).ToList();
process(items);
undoRedoState.ProcessedItemCount = processedItemCount;
}
public static void Redo <T>(this UndoRedoState <T> undoRedoState, int itemCount, Action <IReadOnlyList <T> > process)
{
Assert.IsNotNull(undoRedoState);
Assert.IsInRange(itemCount > 0);
Assert.IsNotNull(process);
var unprocessedItemCount = undoRedoState.GetUnprocessedItemCount();
if (unprocessedItemCount < itemCount)
{
throw new InvalidOperationException("Nincs meg a megadott számú ismételhető művelet.");
}
var items = undoRedoState.Items.GetRange(undoRedoState.ProcessedItemCount, itemCount).ToList();
process(items);
undoRedoState.ProcessedItemCount += itemCount;
}
private static int GetUnprocessedItemCount <T>(this UndoRedoState <T> undoRedoState)
{
Assert.IsNotNull(undoRedoState);
return(undoRedoState.Items.Count - undoRedoState.ProcessedItemCount);
}