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# Code for One Thing Leads to Another

    /****************************************************************************
    **
    ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the $MODULE$ of the Qt Toolkit.
    **
    ** ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
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    ** review the following information:
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    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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();
        }
    }