path: root/src/menu/control.cpp

/*
 * UltraStar Deluxe - Karaoke Game
 *
 * UltraStar Deluxe is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "control.hpp"

namespace usdx
{
	Control::Control(Control *owner)
		: owner(owner)
	{
		if (owner) {
			owner->add_slave(this);
		}
	}

	Control::~Control()
	{
		// you need the next iterator to be able to produce the next value after
		// removing it (each control, will be issue a request to remove it self
		// from the list)
		for (std::list<const Control*>::iterator next = slaves.begin(),
			 it = next++; it != slaves.end(); it = next++) {
			delete *it;
		}

		slaves.clear();

		// remove object from owners list, to avoid double free
		set_owner(NULL);
	}

	void Control::set_owner(Control *owner)
	{
		if (this->owner != owner) {
			if (this->owner) {
				this->owner->remove_slave(this);
			}

			this->owner = owner;

			if (this->owner) {
				this->owner->add_slave(this);
			}
		}
	}

	const Control* Control::get_owner(void) const
	{
		return owner;
	}

	void Control::add_slave(const Control *new_slave)
	{
		slaves.push_back(new_slave);
	}

	void Control::remove_slave(const Control *slave)
	{
		slaves.remove(slave);
	}
};