Qt 4.0: lcdrange.cpp Example File (tutorial/t9/lcdrange.cpp)

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# lcdrange.cpp Example File
tutorial/t9/lcdrange.cpp

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        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
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        /****************************************************************
        **
        ** Implementation of LCDRange class, Qt tutorial 9
        **
        ****************************************************************/

        #include <QLCDNumber>
        #include <QSlider>
        #include <QVBoxLayout>

        #include "lcdrange.h"

        LCDRange::LCDRange(QWidget *parent)
            : QWidget(parent)
        {
            QLCDNumber *lcd = new QLCDNumber(2);
            slider = new QSlider(Qt::Horizontal);
            slider->setRange(0, 99);
            slider->setValue(0);

            connect(slider, SIGNAL(valueChanged(int)),
                    lcd, SLOT(display(int)));
            connect(slider, SIGNAL(valueChanged(int)),
                    this, SIGNAL(valueChanged(int)));

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

            setFocusProxy(slider);
        }

        int LCDRange::value() const
        {
            return slider->value();
        }

        void LCDRange::setValue(int value)
        {
            slider->setValue(value);
        }

        void LCDRange::setRange(int minValue, int maxValue)
        {
            if (minValue < 0 || maxValue > 99 || minValue > maxValue) {
                qWarning("LCDRange::setRange(%d, %d)\n"
                         "\tRange must be 0..99\n"
                         "\tand minValue must not be greater than maxValue",
                         minValue, maxValue);
                return;
            }
            slider->setRange(minValue, maxValue);
        }