Qt 4.0: objects.cpp Example File (activeqt/hierarchy/objects.cpp)

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

        /****************************************************************************
        **
        ** Copyright (C) 1992-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
    ** http://www.trolltech.com/products/qt/licensing.html or contact the
    ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #include "objects.h"
        #include <qlayout.h>
        #include <qpainter.h>

        /* 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);
        }