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lcdrange.cpp Example File
tutorial/t11/lcdrange.cpp

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    /****************************************************************
    **
    ** Implementation of LCDRange class, Qt tutorial 11
    **
    ****************************************************************/

    #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);
    }