lcdrange.cpp Example File
^{tutorial/t13/lcdrange.cpp}

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    ** This file is part of the documentation of the Qt Toolkit.
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    #include <QLCDNumber>
    #include <QLabel>
    #include <QSlider>
    #include <QVBoxLayout>

    #include "lcdrange.h"

    LCDRange::LCDRange(QWidget *parent)
        : QWidget(parent)
    {
        init();
    }

    LCDRange::LCDRange(const QString &text, QWidget *parent)
        : QWidget(parent)
    {
        init();
        setText(text);
    }

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

        slider = new QSlider(Qt::Horizontal);
        slider->setRange(0, 99);
        slider->setValue(0);
        label = new QLabel;
        label->setAlignment(Qt::AlignHCenter | Qt::AlignTop);
        label->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

        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);
        layout->addWidget(label);
        setLayout(layout);

        setFocusProxy(slider);
    }

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

    QString LCDRange::text() const
    {
        return label->text();
    }

    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);
    }

    void LCDRange::setText(const QString &text)
    {
        label->setText(text);
    }