qtbase/examples/opengl/qopenglwidget/mainwindow.cpp

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#include "mainwindow.h"

#include <QApplication>
#include <QMenuBar>
#include <QGroupBox>
#include <QSlider>
#include <QLabel>
#include <QCheckBox>
#include <QSpinBox>

#include "glwidget.h"

MainWindow::MainWindow()
    : m_nextX(1), m_nextY(1)
{
    GLWidget *glwidget = new GLWidget(this, true, qRgb(20, 20, 50));
    QLabel *label = new QLabel(this);
    m_timer = new QTimer(this);
    QSlider *slider = new QSlider(this);
    slider->setOrientation(Qt::Horizontal);

    QLabel *updateLabel = new QLabel("Update interval");
    QSpinBox *updateInterval = new QSpinBox(this);
    updateInterval->setSuffix(" ms");
    updateInterval->setValue(10);
    updateInterval->setToolTip("Interval for the timer that calls update().\n"
                               "Note that on most systems the swap will block to wait for vsync\n"
                               "and therefore an interval < 16 ms will likely lead to a 60 FPS update rate.");
    QGroupBox *updateGroupBox = new QGroupBox(this);
    QCheckBox *transparent = new QCheckBox("Transparent background", this);
    transparent->setToolTip("Toggles Qt::WA_AlwaysStackOnTop and transparent clear color for glClear().\n"
                            "Note how the button on top stacks incorrectly when enabling this.");
    QHBoxLayout *updateLayout = new QHBoxLayout;
    updateLayout->addWidget(updateLabel);
    updateLayout->addWidget(updateInterval);
    updateLayout->addWidget(transparent);
    updateGroupBox->setLayout(updateLayout);

    slider->setRange(0, 50);
    slider->setSliderPosition(30);
    m_timer->setInterval(10);
    label->setText("A QOpenGLWidget");
    label->setAlignment(Qt::AlignHCenter);

    QGroupBox * groupBox = new QGroupBox(this);
    setCentralWidget(groupBox);
    groupBox->setTitle("QOpenGLWidget Example");

    m_layout = new QGridLayout(groupBox);

    m_layout->addWidget(glwidget,1,0,8,1);
    m_layout->addWidget(label,9,0,1,1);
    m_layout->addWidget(updateGroupBox, 10, 0, 1, 1);
    m_layout->addWidget(slider, 11,0,1,1);

    groupBox->setLayout(m_layout);

    QMenu *fileMenu = menuBar()->addMenu("&File");
    QMenu *showMenu = menuBar()->addMenu("&Show");
    QMenu *helpMenu = menuBar()->addMenu("&Help");
    QAction *exit = new QAction("E&xit", fileMenu);
    QAction *aboutQt = new QAction("About Qt", helpMenu);
    QAction *showLogo = new QAction("Show 3D Logo", showMenu);
    QAction *showTexture = new QAction("Show 2D Texture", showMenu);
    QAction *showBubbles = new QAction("Show bubbles", showMenu);
    showBubbles->setCheckable(true);
    showBubbles->setChecked(true);
    fileMenu->addAction(exit);
    helpMenu->addAction(aboutQt);
    showMenu->addAction(showLogo);
    showMenu->addAction(showTexture);
    showMenu->addAction(showBubbles);

    connect(exit, SIGNAL(triggered(bool)), this, SLOT(close()));
    connect(aboutQt, SIGNAL(triggered(bool)), qApp, SLOT(aboutQt()));

    connect(m_timer, SIGNAL(timeout()), glwidget, SLOT(update()));

    connect(showLogo, SIGNAL(triggered(bool)), glwidget, SLOT(setLogo()));
    connect(showTexture, SIGNAL(triggered(bool)), glwidget, SLOT(setTexture()));
    connect(showBubbles, SIGNAL(triggered(bool)), glwidget, SLOT(setShowBubbles(bool)));
    connect(slider, SIGNAL(valueChanged(int)), glwidget, SLOT(setScaling(int)));
    connect(transparent, &QCheckBox::toggled, glwidget, &GLWidget::setTransparent);

    connect(updateInterval, SIGNAL(valueChanged(int)), this, SLOT(updateIntervalChanged(int)));

    m_timer->start();
}

void MainWindow::updateIntervalChanged(int value)
{
    m_timer->setInterval(value);
    m_timer->start();
}

void MainWindow::addNew()
{
    if (m_nextY == 4)
        return;
    GLWidget *w = new GLWidget(this, false, qRgb(qrand() % 256, qrand() % 256, qrand() % 256));
    connect(m_timer, SIGNAL(timeout()), w, SLOT(update()));
    m_layout->addWidget(w, m_nextY, m_nextX, 1, 1);
    if (m_nextX == 3) {
        m_nextX = 1;
        ++m_nextY;
    } else {
        ++m_nextX;
    }
}