idledraw.h

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/*
 Copyright (C) 2001-2006, William Joseph.
 All Rights Reserved.

 This file is part of GtkRadiant.

 GtkRadiant 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.

 GtkRadiant 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 GtkRadiant; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined(INCLUDED_GTKUTIL_IDLEDRAW_H)
#define INCLUDED_GTKUTIL_IDLEDRAW_H

#include <glib/gmain.h>

#include "generic/callback.h"

class IdleDraw
{
        Callback m_draw;
        unsigned int m_handler;
        static gboolean draw (gpointer data)
        {
            reinterpret_cast<IdleDraw*> (data)->m_draw();
            reinterpret_cast<IdleDraw*> (data)->m_handler = 0;
            return FALSE;
        }
    public:
        IdleDraw (const Callback& draw) :
            m_draw(draw), m_handler(0)
        {
        }
        ~IdleDraw ()
        {
            if (m_handler != 0) {
                g_source_remove(m_handler);
            }
        }
        void queueDraw ()
        {
            if (m_handler == 0) {
                m_handler = g_idle_add(&draw, this);
            }
        }
        typedef MemberCaller<IdleDraw, &IdleDraw::queueDraw> QueueDrawCaller;

        void flush ()
        {
            if (m_handler != 0) {
                draw(this);
            }
        }
};

#endif