public void Redo()
{
if (undoListCount == changeList.Count)
{
return;
}
UndoRedoChange change = (UndoRedoChange)changeList [undoListCount++];
if (change.CheckValid())
{
UndoRedoChange res = change.ApplyChange();
if (res != null)
{
changeList [undoListCount - 1] = res;
}
else
{
// Redo failed
undoListCount--;
changeList.RemoveAt(undoListCount);
}
}
else
{
changeList.RemoveAt(--undoListCount);
Redo();
}
}
public void Undo()
{
if (undoListCount == 0)
{
return;
}
UndoRedoChange change = (UndoRedoChange)changeList [--undoListCount];
if (change.CheckValid())
{
UndoRedoChange res = change.ApplyChange();
if (res != null)
{
changeList [undoListCount] = res;
}
else
{
// Undo failed
changeList.RemoveAt(undoListCount);
}
}
else
{
changeList.RemoveAt(undoListCount);
Undo();
}
}
public void AddChange (UndoRedoChange change)
{
if (undoListCount < changeList.Count) {
// Destroy all undone changes
changeList.RemoveRange (undoListCount, changeList.Count - undoListCount);
}
changeList.Add (change);
undoListCount = changeList.Count;
}
public void AddChange(UndoRedoChange change)
{
if (undoListCount < changeList.Count)
{
// Destroy all undone changes
changeList.RemoveRange(undoListCount, changeList.Count - undoListCount);
}
changeList.Add(change);
undoListCount = changeList.Count;
}
public void Purge()
{
for (int n = 0; n < changeList.Count; n++)
{
UndoRedoChange change = (UndoRedoChange)changeList [n];
if (!change.CheckValid())
{
changeList.RemoveAt(n);
if (n < undoListCount)
{
undoListCount--;
}
}
}
}