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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qbasictimer.h"
#include "qcoreapplication.h"
#include "qabstracteventdispatcher.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 given \a object will receive timer events.
\sa stop() isActive() QObject::timerEvent()
*/
void QBasicTimer::start(int msec, QObject *obj)
{
stop();
if (obj)
id = obj->startTimer(msec);
}
/*!
Stops the timer.
\sa start() isActive()
*/
void QBasicTimer::stop()
{
if (id) {
QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
if (eventDispatcher)
eventDispatcher->unregisterTimer(id);
}
id = 0;
}
QT_END_NAMESPACE
|
