dummy.cpp

#include "dummy.h"

MainWindow::MainWindow()
{
    slider = new QSlider(Qt::Horizontal);
    slider->setMinimum(0);
    slider->setMaximum(100);
    lineEdit = new QLineEdit();

    QObject::connect(slider, SIGNAL(valueChanged(int)),
                     this, SLOT(onValueChanged(int)));

    QVBoxLayout *layout = new QVBoxLayout();
    layout->addWidget(slider);
    layout->addWidget(lineEdit);

    QWidget *wrapper = new QWidget();
    wrapper->setLayout(layout);
    setCentralWidget(wrapper);
}

MainWindow::~MainWindow()
{
}

void MainWindow::onValueChanged(int value)
{
    int pos;

    printf("Enter onValueChanged\n");

    pos = slider->sliderPosition();
    QString text = QString::number(pos);
    lineEdit->setText(text);

    QMessageBox::StandardButton reply;
    reply = QMessageBox::question(this, "Test", "Just a test!",
                                QMessageBox::Yes|QMessageBox::No);

    printf("Exit onValueChanged\n");
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow mainWindow;
    mainWindow.show();
    return app.exec();
}