Mega Code Archive
Qt cast
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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** 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
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#ifndef QTCAST_H
#define QTCAST_H
#include <QWidget>
class MyWidget : public QWidget
{
Q_OBJECT
public:
MyWidget();
};
#endif
#include <QLabel>
#include <QPushButton>
#include "qtcast.h"
MyWidget::MyWidget()
{
QObject *obj = new MyWidget;
QWidget *widget = qobject_cast<QWidget *>(obj);
MyWidget *myWidget = qobject_cast<MyWidget *>(obj);
QLabel *label = qobject_cast<QLabel *>(obj);
// label is 0
if (QLabel *label = qobject_cast<QLabel *>(obj)) {
label->setText(tr("Ping"));
} else if (QPushButton *button = qobject_cast<QPushButton *>(obj)) {
button->setText(tr("Pong!"));
}
}
int main()
{
return 0;
}
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