Qt 4.6: objects.cpp Example File (activeqt/hierarchy/objects.cpp)

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# objects.cpp Example File
activeqt/hierarchy/objects.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples 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.
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     ** additional rights.  These rights are described in the Nokia Qt LGPL
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     ****************************************************************************/

     #include "objects.h"
     #include <QLayout>
     #include <QPainter>

     /* Implementation of QParentWidget */
     QParentWidget::QParentWidget(QWidget *parent)
     : QWidget(parent)
     {
         vbox = new QVBoxLayout(this);
     }

     void QParentWidget::createSubWidget(const QString &name)
     {
         QSubWidget *sw = new QSubWidget(this, name);
         vbox->addWidget(sw);
         sw->setLabel(name);
         sw->show();
     }

     QSubWidget *QParentWidget::subWidget(const QString &name)
     {
         return qFindChild<QSubWidget*>(this, name);
     }

     QSize QParentWidget::sizeHint() const
     {
         return QWidget::sizeHint().expandedTo(QSize(100, 100));
     }

     /* Implementation of QSubWidget */
     QSubWidget::QSubWidget(QWidget *parent, const QString &name)
     : QWidget(parent)
     {
         setObjectName(name);
     }

     void QSubWidget::setLabel(const QString &text)
     {
         lbl = text;
         setObjectName(text);
         update();
     }

     QString QSubWidget::label() const
     {
         return lbl;
     }

     QSize QSubWidget::sizeHint() const
     {
         QFontMetrics fm(font());
         return QSize(fm.width(lbl), fm.height());
     }

     void QSubWidget::paintEvent(QPaintEvent *)
     {
         QPainter painter(this);
         painter.setPen(palette().text().color());
         painter.drawText(rect(), Qt::AlignCenter, lbl);
     }