objects.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2015 The Qt Company Ltd.
 ** Contact: http://www.qt.io/licensing/
 **
 ** 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 The Qt Company Ltd 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);
 }