doc/src/snippets/signalsandslots/signalsandslots.cpp
author Eckhart Koeppen <eckhart.koppen@nokia.com>
Thu, 08 Apr 2010 14:19:33 +0300
branchRCL_3
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the documentation of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QAbstractButton>
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#include "signalsandslots.h"
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//! [0]
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void Counter::setValue(int value)
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{
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    if (value != m_value) {
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        m_value = value;
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        emit valueChanged(value);
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    }
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}
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//! [0]
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int main()
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{
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//! [1]
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    Counter a, b;
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//! [1] //! [2]
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    QObject::connect(&a, SIGNAL(valueChanged(int)),
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                     &b, SLOT(setValue(int)));
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//! [2]
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//! [3]
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    a.setValue(12);     // a.value() == 12, b.value() == 12
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//! [3] //! [4]
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    b.setValue(48);     // a.value() == 12, b.value() == 48
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//! [4]
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    QWidget *widget = reinterpret_cast<QWidget *>(new QObject(0));
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//! [5]
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    if (widget->inherits("QAbstractButton")) {
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        QAbstractButton *button = static_cast<QAbstractButton *>(widget);
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        button->toggle();
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//! [5] //! [6]
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    }
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//! [6]
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//! [7]
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    if (QAbstractButton *button = qobject_cast<QAbstractButton *>(widget))
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        button->toggle();
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//! [7]
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}