/****************************************************************************
** $Id: qt/qeventloop.h   3.2.3   edited Aug 29 08:51 $
**
** Declaration of QEventLoop class
**
** Copyright (C) 1992-2002 Trolltech AS.  All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
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** licenses may use this file in accordance with the Qt Commercial License
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**********************************************************************/

#ifndef QEVENTLOOP_H
#define QEVENTLOOP_H

#include "qobject.h"
#include "qsocketnotifier.h"

class QEventLoopPrivate;
class QSocketNotifier;
class QTimer;
#ifdef Q_WS_MAC
struct timeval; //stdc struct
struct TimerInfo; //internal structure (qeventloop_mac.cpp)
#endif

#if defined(QT_THREAD_SUPPORT)
class QMutex;
#endif // QT_THREAD_SUPPORT


class Q_EXPORT QEventLoop : public QObject
{
    Q_OBJECT

public:
    QEventLoop( QObject *parent = 0, const char *name = 0 );
    ~QEventLoop();

    enum ProcessEvents {
	AllEvents		= 0x00,
	ExcludeUserInput	= 0x01,
	ExcludeSocketNotifiers	= 0x02,
	WaitForMore		= 0x04
    };
    typedef uint ProcessEventsFlags;

    void processEvents( ProcessEventsFlags flags, int maxtime );
    virtual bool processEvents( ProcessEventsFlags flags );

    virtual bool hasPendingEvents() const;

    virtual void registerSocketNotifier( QSocketNotifier * );
    virtual void unregisterSocketNotifier( QSocketNotifier * );
    void setSocketNotifierPending( QSocketNotifier * );
    int activateSocketNotifiers();

    int activateTimers();
    int timeToWait() const;

    virtual int exec();
    virtual void exit( int retcode = 0 );

    virtual int enterLoop();
    virtual void exitLoop();
    virtual int loopLevel() const;

    virtual void wakeUp();

signals:
    void awake();
    void aboutToBlock();

private:
#if defined(Q_WS_MAC)
    friend QMAC_PASCAL void qt_mac_select_timer_callbk(EventLoopTimerRef, void *);
    int macHandleSelect(timeval *);
    void macHandleTimer(TimerInfo *);
#endif // Q_WS_MAC

    // internal initialization/cleanup - implemented in various platform specific files
    void init();
    void cleanup();
    virtual void appStartingUp();
    virtual void appClosingDown();

    // data for the default implementation - other implementations should not
    // use/need this data
    QEventLoopPrivate *d;

    friend class QApplication;
};

#endif // QEVENTLOOP_H
