Qt 4.3: lcdrange.cpp Example File (tutorial/t13/lcdrange.cpp)

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# lcdrange.cpp Example File
tutorial/t13/lcdrange.cpp

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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);
     }