Method undo

src/undo/map_part_undo.cpp:87–116

virtual

// virtual
UndoStep* MapPartUndoStep::undo()
{
	UndoStep* redo_step = nullptr;
	switch (change)
	{
	case AddMapPart:
		Q_ASSERT(map->getNumParts()+1 > index);
		map->addPart(new MapPart(name, map), index);
		redo_step = new MapPartUndoStep(map, RemoveMapPart, index);
	    break;
	case RemoveMapPart:
		Q_ASSERT(map->getPart(index)->getNumObjects() == 0);
		redo_step = new MapPartUndoStep(map, AddMapPart, index);
		map->removePart(index);
		break;
	case ModifyMapPart:
		Q_ASSERT(map->getNumParts() > index);
		redo_step = new MapPartUndoStep(map, ModifyMapPart, index);
		map->getPart(index)->setName(name);
		break;
	case UndefinedChange:
		Q_ASSERT(false);
		redo_step = new NoOpUndoStep(map, true);
		break;
	// default: nothing left (but watch compiler warnings).
	}
	
	Q_ASSERT(redo_step);
	return redo_step;
}

// virtual
bool MapPartUndoStep::getModifiedParts(PartSet &out) const