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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qbasictimer.h"
#include "qabstracteventdispatcher.h"
#include "qabstracteventdispatcher_p.h"

QT_BEGIN_NAMESPACE

/*!
    \class QBasicTimer
    \brief The QBasicTimer class provides timer events for objects.

    \ingroup events

    This is a fast, lightweight, and low-level class used by Qt
    internally. We recommend using the higher-level QTimer class
    rather than this class if you want to use timers in your
    applications. Note that this timer is a repeating timer that
    will send subsequent timer events unless the stop() function is called.

    To use this class, create a QBasicTimer, and call its start()
    function with a timeout interval and with a pointer to a QObject
    subclass. When the timer times out it will send a timer event to
    the QObject subclass. The timer can be stopped at any time using
    stop(). isActive() returns true for a timer that is running;
    i.e. it has been started, has not reached the timeout time, and
    has not been stopped. The timer's ID can be retrieved using
    timerId().

    The \l{widgets/wiggly}{Wiggly} example uses QBasicTimer to repaint
    a widget at regular intervals.

    \sa QTimer, QTimerEvent, QObject::timerEvent(), Timers, {Wiggly Example}
*/


/*!
    \fn QBasicTimer::QBasicTimer()

    Contructs a basic timer.

    \sa start()
*/
/*!
    \fn QBasicTimer::~QBasicTimer()

    Destroys the basic timer.
*/

/*!
    \fn bool QBasicTimer::isActive() const

    Returns true if the timer is running and has not been stopped; otherwise
    returns false.

    \sa start() stop()
*/

/*!
    \fn int QBasicTimer::timerId() const

    Returns the timer's ID.

    \sa QTimerEvent::timerId()
*/

/*!
    \fn void QBasicTimer::start(int msec, QObject *object)

    Starts (or restarts) the timer with a \a msec milliseconds timeout. The
    timer will be a Qt::CoarseTimer. See Qt::TimerType for information on the
    different timer types.

    The given \a object will receive timer events.

    \sa stop() isActive() QObject::timerEvent() Qt::CoarseTimer
 */
void QBasicTimer::start(int msec, QObject *obj)
{
    QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
    if (!eventDispatcher) {
        qWarning("QBasicTimer::start: QBasicTimer can only be used with threads started with QThread");
        return;
    }
    if (id) {
        eventDispatcher->unregisterTimer(id);
        QAbstractEventDispatcherPrivate::releaseTimerId(id);
    }
    id = 0;
    if (obj)
        id = eventDispatcher->registerTimer(msec, Qt::CoarseTimer, obj);
}

/*!
    \overload

    Starts (or restarts) the timer with a \a msec milliseconds timeout and the
    given \a timerType. See Qt::TimerType for information on the different
    timer types.

    The given \a object will receive timer events.

    \sa stop() isActive() QObject::timerEvent() Qt::TimerType
 */
void QBasicTimer::start(int msec, Qt::TimerType timerType, QObject *obj)
{
    QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
    if (!eventDispatcher) {
        qWarning("QBasicTimer::start: QBasicTimer can only be used with threads started with QThread");
        return;
    }
    if (id) {
        eventDispatcher->unregisterTimer(id);
        QAbstractEventDispatcherPrivate::releaseTimerId(id);
    }
    id = 0;
    if (obj)
        id = eventDispatcher->registerTimer(msec, timerType, obj);
}

/*!
    Stops the timer.

    \sa start() isActive()
*/
void QBasicTimer::stop()
{
    if (id) {
        QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
        if (eventDispatcher)
            eventDispatcher->unregisterTimer(id);
        QAbstractEventDispatcherPrivate::releaseTimerId(id);
    }
    id = 0;
}

QT_END_NAMESPACE