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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(QString)),
                 this, SLOT(setFormatString(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);
     }