/******************************************************************************** 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 documentation 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 <QtGui>class Updater : public QObject{ Q_OBJECTpublic: Updater(QWidget *widget);public slots: void adjustSize();private: QWidget *widget;};Updater::Updater(QWidget *widget) : widget(widget){}void Updater::adjustSize(){ widget->adjustSize();}int main(int argc, char *argv[]){ QApplication app(argc, argv); QLabel *label = new QLabel("My label"); QLineEdit *editor = new QLineEdit("New text"); QWidget window; //Updater updater(&label); QObject::connect(editor, SIGNAL(textChanged(const QString &)), label, SLOT(setText(const QString &))); //QObject::connect(editor, SIGNAL(textChanged(const QString &)), // &updater, SLOT(adjustSize())); //editor.show(); //label.show(); QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(label); layout->addWidget(editor); window.setLayout(layout); window.show(); return app.exec();}#include "main.moc"