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# iconsizespinbox.cpp Example File
widgets/icons/iconsizespinbox.cpp

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     #include <QtGui>

     #include "iconsizespinbox.h"

     IconSizeSpinBox::IconSizeSpinBox(QWidget *parent)
         : QSpinBox(parent)
     {
     }

     int IconSizeSpinBox::valueFromText(const QString &text) const
     {
         QRegExp regExp(tr("(\\d+)(\\s*[xx]\\s*\\d+)?"));

         if (regExp.exactMatch(text)) {
             return regExp.cap(1).toInt();
         } else {
             return 0;
         }
     }

     QString IconSizeSpinBox::textFromValue(int value) const
     {
         return tr("%1 x %1").arg(value);
     }