Qt 4.8: objects.cpp Example File (activeqt/hierarchy/objects.cpp)

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# objects.cpp Example File

activeqt/hierarchy/objects.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #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 findChild<QSubWidget*>(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);
     }