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

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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);
 }