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Code for One Thing Leads to Another

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package com.trolltech.examples.tutorial;

import com.trolltech.qt.gui.*;
import com.trolltech.qt.core.*;

public class ConnectedSliders extends QWidget
{
    public ConnectedSliders()
    {
        QPushButton quit = new QPushButton(tr("Quit"));
        quit.setFont(new QFont("Times", 18, QFont.Weight.Bold.value()));

        quit.clicked.connect(QApplication.instance(), "quit()");

        QGridLayout grid = new QGridLayout();
        LCDRange previousRange = null;

        for (int row = 0; row < 3; ++row) {
            for (int column = 0; column < 3; ++column) {
                LCDRange lcdRange = new LCDRange();
                grid.addWidget(lcdRange, row, column);

            if (previousRange != null)
                lcdRange.valueChanged.
                connect(previousRange, "setValue(int)");

                previousRange = lcdRange;
            }
        }
        QVBoxLayout layout = new QVBoxLayout();
        layout.addWidget(quit);
        layout.addLayout(grid);
        setLayout(layout);
        setWindowTitle(tr("One Thing Leads to Another"));
    }

    class LCDRange extends QWidget
    {
        private QSlider slider;
        private int value;

        public final Signal1<Integer> valueChanged = new Signal1<Integer>();

        public LCDRange()
        {
            QLCDNumber lcd = new QLCDNumber(2);
            lcd.setSegmentStyle(QLCDNumber.SegmentStyle.Filled);

            slider = new QSlider(Qt.Orientation.Horizontal);
            slider.setRange(0, 99);
            slider.setValue(0);

            slider.valueChanged.connect(lcd, "display(int)");
            slider.valueChanged.connect(valueChanged);

            QVBoxLayout layout = new QVBoxLayout();
            layout.addWidget(lcd);
            layout.addWidget(slider);
            setLayout(layout);
        }

        public int value()
        {
            return value;
        }

        public void setValue(int value)
        {
            slider.setValue(value);
        }
    }

    public static void main(String args[])
    {
        QApplication.initialize(args);

        ConnectedSliders widget = new ConnectedSliders();
        widget.show();

        QApplication.exec();
    }
}


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Qt Jambi 4.5.2_01