//--------------------//
#region Undo
/// <inheritdoc/>
protected override void OnUndo()
{
// Remove last command from the undo list, execute it and add it to the redo list
IUndoCommand lastCommand = UndoBackups.Pop();
lastCommand.Undo();
RedoBackups.Push(lastCommand);
}
/// <summary>
/// Called to redo the last undone change
/// </summary>
protected override void OnRedo()
{
// Remove the last backup from the redo list, then add the current backup to the undo list
ICloneable toRestore = RedoBackups.Pop();
UndoBackups.Push(_currentBackup);
// Restore the backup and update the current backup
Content = (ICloneable)toRestore.Clone();
_currentBackup = (ICloneable)Content.Clone();
}