Qt 5.11 | Qt OpenGL | Hello GL2 Example | window.cpp Example File

Qt 5.11.3 Reference Documentation

# window.cpp Example File

hellogl2/window.cpp

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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"));
              }
          }
      }