private void OverflowIfNecessary(HistoryEventArgs <T> eventArgs)
{
if (!MaxSize.HasValue || CurrentIndex < MaxSize.Value)
{
return;
}
RemoveOldestItem();
HistoryOverflowed?.Invoke(this, eventArgs);
}
public void RememberNew(T item)
{
var eventArgs = _history.IsEmpty()
? HistoryEventArgs <T> .OnlyCurrentItem(
currentItem : item)
: HistoryEventArgs <T> .BothItems(
currentItem : item,
previousItem : CurrentItem);
AddNewItem(item);
NewItemRemembered?.Invoke(this, eventArgs);
OverflowIfNecessary(eventArgs);
}
public void Repeat()
{
if (!CanRepeat)
{
return;
}
var eventArgs = HistoryEventArgs <T> .BothItems(
currentItem : NextItem,
previousItem : CurrentItem);
CurrentIndex++;
HistoryRepeated?.Invoke(this, eventArgs);
}
public void Undo()
{
if (!CanUndo)
{
return;
}
var eventArgs = HistoryEventArgs <T> .BothItems(
currentItem : PreviousItem,
previousItem : CurrentItem);
CurrentIndex--;
HistoryUndid?.Invoke(this, eventArgs);
}
public void ForgetCurrent()
{
if (_history.IsEmpty())
{
return;
}
var eventArgs = CurrentIndex == 0
? HistoryEventArgs <T> .OnlyPreviousItem(
previousItem : CurrentItem)
: HistoryEventArgs <T> .BothItems(
currentItem : PreviousItem,
previousItem : CurrentItem);
RemoveCurrentItem();
CurrentItemForgotten?.Invoke(this, eventArgs);
}
