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** This file is part of the examples of the Qt Toolkit.
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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));
    m_glWidgets << glwidget;
    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 *timerBased = new QCheckBox("Use timer", this);
    timerBased->setChecked(true);
    timerBased->setToolTip("Toggles using a timer to trigger update().\n"
                           "When not set, each paintGL() schedules the next update immediately,\n"
                           "expecting the blocking swap to throttle the thread.\n"
                           "This shows how unnecessary the timer is in most cases.");
    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(timerBased);
    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)));
    connect(timerBased, &QCheckBox::toggled, this, &MainWindow::timerUsageChanged);
    connect(timerBased, &QCheckBox::toggled, updateInterval, &QWidget::setEnabled);

    m_timer->start();
}

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

void MainWindow::addNew()
{
    if (m_nextY == 4)
        return;
    GLWidget *w = new GLWidget(this, false, qRgb(qrand() % 256, qrand() % 256, qrand() % 256));
    m_glWidgets << w;
    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;
    }
}

void MainWindow::timerUsageChanged(bool enabled)
{
    if (enabled) {
        m_timer->start();
    } else {
        m_timer->stop();
        foreach (QOpenGLWidget *w, m_glWidgets)
            w->update();
    }
}
