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window.cpp Example File
widgets/spinboxes/window.cpp

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 #include <QtGui>

 #include "window.h"

 Window::Window()
 {
     createSpinBoxes();
     createDateTimeEdits();
     createDoubleSpinBoxes();

     QHBoxLayout *layout = new QHBoxLayout;
     layout->addWidget(spinBoxesGroup);
     layout->addWidget(editsGroup);
     layout->addWidget(doubleSpinBoxesGroup);
     setLayout(layout);

     setWindowTitle(tr("Spin Boxes"));
 }

 void Window::createSpinBoxes()
 {
     spinBoxesGroup = new QGroupBox(tr("Spinboxes"));

     QLabel *integerLabel = new QLabel(tr("Enter a value between "
         "%1 and %2:").arg(-20).arg(20));
     QSpinBox *integerSpinBox = new QSpinBox;
     integerSpinBox->setRange(-20, 20);
     integerSpinBox->setSingleStep(1);
     integerSpinBox->setValue(0);

     QLabel *zoomLabel = new QLabel(tr("Enter a zoom value between "
         "%1 and %2:").arg(0).arg(1000));
     QSpinBox *zoomSpinBox = new QSpinBox;
     zoomSpinBox->setRange(0, 1000);
     zoomSpinBox->setSingleStep(10);
     zoomSpinBox->setSuffix("%");
     zoomSpinBox->setSpecialValueText(tr("Automatic"));
     zoomSpinBox->setValue(100);

     QLabel *priceLabel = new QLabel(tr("Enter a price between "
         "%1 and %2:").arg(0).arg(999));
     QSpinBox *priceSpinBox = new QSpinBox;
     priceSpinBox->setRange(0, 999);
     priceSpinBox->setSingleStep(1);
     priceSpinBox->setPrefix("$");
     priceSpinBox->setValue(99);

     QVBoxLayout *spinBoxLayout = new QVBoxLayout;
     spinBoxLayout->addWidget(integerLabel);
     spinBoxLayout->addWidget(integerSpinBox);
     spinBoxLayout->addWidget(zoomLabel);
     spinBoxLayout->addWidget(zoomSpinBox);
     spinBoxLayout->addWidget(priceLabel);
     spinBoxLayout->addWidget(priceSpinBox);
     spinBoxesGroup->setLayout(spinBoxLayout);
 }

 void Window::createDateTimeEdits()
 {
     editsGroup = new QGroupBox(tr("Date and time spin boxes"));

     QLabel *dateLabel = new QLabel;
     QDateEdit *dateEdit = new QDateEdit(QDate::currentDate());
     dateEdit->setDateRange(QDate(2005, 1, 1), QDate(2010, 12, 31));
     dateLabel->setText(tr("Appointment date (between %0 and %1):")
                        .arg(dateEdit->minimumDate().toString(Qt::ISODate))
                        .arg(dateEdit->maximumDate().toString(Qt::ISODate)));

     QLabel *timeLabel = new QLabel;
     QTimeEdit *timeEdit = new QTimeEdit(QTime::currentTime());
     timeEdit->setTimeRange(QTime(9, 0, 0, 0), QTime(16, 30, 0, 0));
     timeLabel->setText(tr("Appointment time (between %0 and %1):")
                        .arg(timeEdit->minimumTime().toString(Qt::ISODate))
                        .arg(timeEdit->maximumTime().toString(Qt::ISODate)));

     meetingLabel = new QLabel;
     meetingEdit = new QDateTimeEdit(QDateTime::currentDateTime());

     QLabel *formatLabel = new QLabel(tr("Format string for the meeting date "
                                         "and time:"));
     QComboBox *formatComboBox = new QComboBox;
     formatComboBox->addItem("yyyy-MM-dd hh:mm:ss (zzz 'ms')");
     formatComboBox->addItem("hh:mm:ss MM/dd/yyyy");
     formatComboBox->addItem("hh:mm:ss dd/MM/yyyy");
     formatComboBox->addItem("hh:mm:ss");
     formatComboBox->addItem("hh:mm ap");

     connect(formatComboBox, SIGNAL(activated(const QString &)),
             this, SLOT(setFormatString(const QString &)));

     setFormatString(formatComboBox->currentText());

     QVBoxLayout *editsLayout = new QVBoxLayout;
     editsLayout->addWidget(dateLabel);
     editsLayout->addWidget(dateEdit);
     editsLayout->addWidget(timeLabel);
     editsLayout->addWidget(timeEdit);
     editsLayout->addWidget(meetingLabel);
     editsLayout->addWidget(meetingEdit);
     editsLayout->addWidget(formatLabel);
     editsLayout->addWidget(formatComboBox);
     editsGroup->setLayout(editsLayout);
 }

 void Window::setFormatString(const QString &formatString)
 {
     meetingEdit->setDisplayFormat(formatString);
     if (meetingEdit->displayedSections() & QDateTimeEdit::DateSections_Mask) {
         meetingEdit->setDateRange(QDate(2004, 11, 1), QDate(2005, 11, 30));
         meetingLabel->setText(tr("Meeting date (between %0 and %1):")
             .arg(meetingEdit->minimumDate().toString(Qt::ISODate))
             .arg(meetingEdit->maximumDate().toString(Qt::ISODate)));
     } else {
         meetingEdit->setTimeRange(QTime(0, 7, 20, 0), QTime(21, 0, 0, 0));
         meetingLabel->setText(tr("Meeting time (between %0 and %1):")
             .arg(meetingEdit->minimumTime().toString(Qt::ISODate))
             .arg(meetingEdit->maximumTime().toString(Qt::ISODate)));
     }
 }

 void Window::createDoubleSpinBoxes()
 {
     doubleSpinBoxesGroup = new QGroupBox(tr("Double precision spinboxes"));

     QLabel *precisionLabel = new QLabel(tr("Number of decimal places "
                                            "to show:"));
     QSpinBox *precisionSpinBox = new QSpinBox;
     precisionSpinBox->setRange(0, 100);
     precisionSpinBox->setValue(2);

     QLabel *doubleLabel = new QLabel(tr("Enter a value between "
         "%1 and %2:").arg(-20).arg(20));
     doubleSpinBox = new QDoubleSpinBox;
     doubleSpinBox->setRange(-20.0, 20.0);
     doubleSpinBox->setSingleStep(1.0);
     doubleSpinBox->setValue(0.0);

     QLabel *scaleLabel = new QLabel(tr("Enter a scale factor between "
         "%1 and %2:").arg(0).arg(1000.0));
     scaleSpinBox = new QDoubleSpinBox;
     scaleSpinBox->setRange(0.0, 1000.0);
     scaleSpinBox->setSingleStep(10.0);
     scaleSpinBox->setSuffix("%");
     scaleSpinBox->setSpecialValueText(tr("No scaling"));
     scaleSpinBox->setValue(100.0);

     QLabel *priceLabel = new QLabel(tr("Enter a price between "
         "%1 and %2:").arg(0).arg(1000));
     priceSpinBox = new QDoubleSpinBox;
     priceSpinBox->setRange(0.0, 1000.0);
     priceSpinBox->setSingleStep(1.0);
     priceSpinBox->setPrefix("$");
     priceSpinBox->setValue(99.99);

     connect(precisionSpinBox, SIGNAL(valueChanged(int)),
             this, SLOT(changePrecision(int)));

     QVBoxLayout *spinBoxLayout = new QVBoxLayout;
     spinBoxLayout->addWidget(precisionLabel);
     spinBoxLayout->addWidget(precisionSpinBox);
     spinBoxLayout->addWidget(doubleLabel);
     spinBoxLayout->addWidget(doubleSpinBox);
     spinBoxLayout->addWidget(scaleLabel);
     spinBoxLayout->addWidget(scaleSpinBox);
     spinBoxLayout->addWidget(priceLabel);
     spinBoxLayout->addWidget(priceSpinBox);
     doubleSpinBoxesGroup->setLayout(spinBoxLayout);
 }

 void Window::changePrecision(int decimals)
 {
     doubleSpinBox->setDecimals(decimals);
     scaleSpinBox->setDecimals(decimals);
     priceSpinBox->setDecimals(decimals);
 }