Qt 4.3: main.cpp Example File (tutorial/t6/main.cpp)

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# main.cpp Example File
tutorial/t6/main.cpp

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     **
     ** This file is part of the documentation of the Qt Toolkit.
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    ** included in the packaging of this file.  Alternatively you may (at
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     #include <QApplication>
     #include <QFont>
     #include <QGridLayout>
     #include <QLCDNumber>
     #include <QPushButton>
     #include <QSlider>
     #include <QVBoxLayout>
     #include <QWidget>

     class LCDRange : public QWidget
     {
     public:
         LCDRange(QWidget *parent = 0);
     };

     LCDRange::LCDRange(QWidget *parent)
         : QWidget(parent)
     {
         QLCDNumber *lcd = new QLCDNumber(2);
         lcd->setSegmentStyle(QLCDNumber::Filled);

         QSlider *slider = new QSlider(Qt::Horizontal);
         slider->setRange(0, 99);
         slider->setValue(0);
         connect(slider, SIGNAL(valueChanged(int)),
                 lcd, SLOT(display(int)));

         QVBoxLayout *layout = new QVBoxLayout;
         layout->addWidget(lcd);
         layout->addWidget(slider);
         setLayout(layout);
     }

     class MyWidget : public QWidget
     {
     public:
         MyWidget(QWidget *parent = 0);
     };

     MyWidget::MyWidget(QWidget *parent)
         : QWidget(parent)
     {
         QPushButton *quit = new QPushButton(tr("Quit"));
         quit->setFont(QFont("Times", 18, QFont::Bold));
         connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));

         QGridLayout *grid = new QGridLayout;
         for (int row = 0; row < 3; ++row) {
             for (int column = 0; column < 3; ++column) {
                 LCDRange *lcdRange = new LCDRange;
                 grid->addWidget(lcdRange, row, column);
             }
         }

         QVBoxLayout *layout = new QVBoxLayout;
         layout->addWidget(quit);
         layout->addLayout(grid);
         setLayout(layout);
     }

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