// return reversed command for Undo. Redo is not reversed
static public UndoableCommand GetReversedForUndo(UndoableCommand command)
{
UndoableCommand reversed = null;
if (command.type == UndoableCommandType.InsertComponent)
{
reversed = command.Clone() as UndoableCommand;
reversed.type = UndoableCommandType.DeleteComponent;
}
else if (command.type == UndoableCommandType.DeleteComponent)
{
reversed = command.Clone() as UndoableCommand;
reversed.type = UndoableCommandType.InsertComponent;
}
else if (command.type == UndoableCommandType.ChangeComponentProperty)
{
reversed = UndoableCommand_Property.GetReversed(command as UndoableCommand_Property);
}
else if (command.type == UndoableCommandType.RoutedCommand)
{
reversed = UndoableCommand_Routed.GetReversed(command as UndoableCommand_Routed);
}
else
{
throw new Exception(String.Format("Command type {0} cannot be reversed", command.type));
}
return(reversed);
}
static public UndoableCommand_Property GetReversed(UndoableCommand_Property command)
{
UndoableCommand_Property reversed = command.Clone() as UndoableCommand_Property;
reversed.newValue = command.oldValue;
reversed.oldValue = command.newValue;
return(reversed);
}