window.cpp Example File

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 #include "glwidget.h"
 #include "window.h"
 #include "mainwindow.h"
 #include <QSlider>
 #include <QVBoxLayout>
 #include <QHBoxLayout>
 #include <QKeyEvent>
 #include <QPushButton>
 #include <QDesktopWidget>
 #include <QApplication>
 #include <QMessageBox>

 Window::Window(MainWindow *mw)
     : mainWindow(mw)
 {
     glWidget = new GLWidget;

     xSlider = createSlider();
     ySlider = createSlider();
     zSlider = createSlider();

     connect(xSlider, &QSlider::valueChanged, glWidget, &GLWidget::setXRotation);
     connect(glWidget, &GLWidget::xRotationChanged, xSlider, &QSlider::setValue);
     connect(ySlider, &QSlider::valueChanged, glWidget, &GLWidget::setYRotation);
     connect(glWidget, &GLWidget::yRotationChanged, ySlider, &QSlider::setValue);
     connect(zSlider, &QSlider::valueChanged, glWidget, &GLWidget::setZRotation);
     connect(glWidget, &GLWidget::zRotationChanged, zSlider, &QSlider::setValue);

     QVBoxLayout *mainLayout = new QVBoxLayout;
     QHBoxLayout *container = new QHBoxLayout;
     container->addWidget(glWidget);
     container->addWidget(xSlider);
     container->addWidget(ySlider);
     container->addWidget(zSlider);

     QWidget *w = new QWidget;
     w->setLayout(container);
     mainLayout->addWidget(w);
     dockBtn = new QPushButton(tr("Undock"), this);
     connect(dockBtn, &QPushButton::clicked, this, &Window::dockUndock);
     mainLayout->addWidget(dockBtn);

     setLayout(mainLayout);

     xSlider->setValue(15 * 16);
     ySlider->setValue(345 * 16);
     zSlider->setValue(0 * 16);

     setWindowTitle(tr("Hello GL"));
 }

 QSlider *Window::createSlider()
 {
     QSlider *slider = new QSlider(Qt::Vertical);
     slider->setRange(0, 360 * 16);
     slider->setSingleStep(16);
     slider->setPageStep(15 * 16);
     slider->setTickInterval(15 * 16);
     slider->setTickPosition(QSlider::TicksRight);
     return slider;
 }

 void Window::keyPressEvent(QKeyEvent *e)
 {
     if (e->key() == Qt::Key_Escape)
         close();
     else
         QWidget::keyPressEvent(e);
 }

 void Window::dockUndock()
 {
     if (parent()) {
         setParent(0);
         setAttribute(Qt::WA_DeleteOnClose);
         move(QApplication::desktop()->width() / 2 - width() / 2,
              QApplication::desktop()->height() / 2 - height() / 2);
         dockBtn->setText(tr("Dock"));
         show();
     } else {
         if (!mainWindow->centralWidget()) {
             if (mainWindow->isVisible()) {
                 setAttribute(Qt::WA_DeleteOnClose, false);
                 dockBtn->setText(tr("Undock"));
                 mainWindow->setCentralWidget(this);
             } else {
                 QMessageBox::information(0, tr("Cannot dock"), tr("Main window already closed"));
             }
         } else {
             QMessageBox::information(0, tr("Cannot dock"), tr("Main window already occupied"));
         }
     }
 }