HexSpinBox (subclassed from QSpinBox)

HexSpinBox.cpp

#include "HexSpinBox.h"

HexSpinBox::HexSpinBox(QWidget *parent)
    : QSpinBox(parent)
{
	validator = new QRegExpValidator(QRegExp("[0-9A-Fa-f]{1,8}"), this);
}

QString HexSpinBox::textFromValue(int value) const
{
	return QString::number(value, 16).toUpper();
}

int HexSpinBox::valueFromText(const QString &text) const
{
	bool ok;
	int val = text.toInt(&ok, 16);
	if (ok) return val;
	return 0;
}

QValidator::State HexSpinBox::validate(QString &text, int &pos) const
{
	return validator->validate(text, pos);
}

HexSpinBox.h

#pragma once

#include <QtGui>

class HexSpinBox : public QSpinBox
{
	Q_OBJECT
public:
	HexSpinBox(QWidget *parent = 0);

protected:
	QValidator::State validate(QString &text, int &pos) const;
	int valueFromText(const QString &text) const;
	QString textFromValue(int value) const;

private:
	QRegExpValidator *validator;
};