source: psi/trunk/src/tasklist.h

/****************************************************************************
** tasklist.h - A small, but useful Task List
** Copyright (C) 2003  Michail Pishchagin
**
** 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; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.
**
****************************************************************************/

#ifndef TASKLIST_H
#define TASKLIST_H

#include <qobject.h>
#include <qptrlist.h>

#include "im.h"
using namespace XMPP;

//----------------------------------------------------------------------------
// TaskList -- read some comments inline
//----------------------------------------------------------------------------

class TaskList : public QObject, public QPtrList<Task>
{
        Q_OBJECT

public:
        TaskList()
        {
                setAutoDelete(true);
        }

        void append(const Task *d)
        {
                if ( isEmpty() )
                        emit started();

                connect(d, SIGNAL(destroyed(QObject *)), SLOT(taskDestroyed(QObject *)));
                QPtrList<Task>::append(d);
        }

signals:
        // started() is emitted, when TaskList doesn't have any tasks in it,
        // and append() is called, indicating, that TaskList contains at least one
        // running Task
        void started();

        // finished() is emitted when TaskList contains one Task, and it suddenly
        // terminates, indicating, that TaskList is empty now
        void finished();

private slots:
        void taskDestroyed(QObject *p)
        {
                setAutoDelete(false);
                remove((Task *)p);
                setAutoDelete(true);

                if ( isEmpty() )
                        emit finished();
        }
};

#endif