/// <summary>
/// Adds a HistorySet to the pending list and tries to commit it.
/// </summary>
public void Add(HistorySet hs)
{
_pendingUndo.Add(hs.Undo);
_pendingRedo.Add(hs.Redo);
TryCommit();
}
/// <summary>
/// Restores the next state.
/// </summary>
public void Redo()
{
if (_redo.Count > 0)
{
HistorySet hs = _redo.Last.Value;
_redo.RemoveLast();
hs.Redo();
_undo.AddLast(hs);
}
}
/// <summary>
/// Commits pending undo and redo to the undo and redo stacks.
/// </summary>
public void Commit()
{
if (_pendingUndo.Count > 0 && _pendingRedo.Count > 0)
{
_pendingUndo.Reverse();
HistorySet hs = new HistorySet(_pendingUndo.ToArray(), _pendingRedo.ToArray());
_redo.Clear();
if (_historyHandler != null)
{
_historyHandler.Add(hs);
}
else
{
hs.Redo();
_undo.AddLast(hs);
}
_pendingRedo.Clear();
_pendingUndo.Clear();
}
}