QNumberEdit.cpp

#include "QNumberEdit.h"

QString QNumberEdit::PREFIX = "0x";

QNumberEdit::QNumberEdit(QWidget *parent)
    : QLineEdit(parent)
{
    QRegExp re("("+PREFIX+")?[0-9A-Fa-f]+");
    validator = new QRegExpValidator(re, this);

    QRegExpValidator *v = new QRegExpValidator(re);
    setValidator( v );
}

bool QNumberEdit::hasPrefix(const QString &text) const
{
    if (text.startsWith(PREFIX, Qt::CaseInsensitive)) {
        return true;
    }
    return false;
}

int QNumberEdit::getBase(const QString &text) const
{
    int defaultbase = 10;
    if (text.length() == 0) return defaultbase;

    if (hasPrefix(text)) return 16;
    if (text.contains(QRegExp("[A-Fa-f]+"))) return 16;

    return defaultbase;
}

void QNumberEdit::leaveEvent ( QEvent * event )
{
QString text = this->text();
    if (!hasPrefix(text) && getBase(text) == 16) {
        this->setText(PREFIX + text);
    }
}

QString QNumberEdit::textFromValue(long long value, int base) const
{
    return QString::number(value, base).toUpper();
}

long long  QNumberEdit::valueFromText(const QString &text, bool *isValid) const
{
    bool isOk;
    int base = this->getBase(text);
    printf("Base = %d\n", base);
    int val = text.toLongLong(&isOk, base);
    if (isValid != NULL) (*isValid) = isOk;
    if (isOk) return val;
    return 0; //DEFAULT
}

long long QNumberEdit::value(bool *isValid)
{
    QString text = this->text();
    return valueFromText(text, isValid);
}

void QNumberEdit::setValue(long long value, int base)
{
    QString text = textFromValue(value, base);
    return setText(text);
}

QNumberEdit.h

#pragma once

#include <QtCore>
#include <QtGui>


class QNumberEdit : public QLineEdit
{
    Q_OBJECT
    Q_PROPERTY(long long value READ value WRITE setValue)

public:
    QNumberEdit(QWidget *parent);
    ~QNumberEdit() {}

    long long value(bool *isValid = NULL);
    void setValue(long long value, int base = 10);

protected:
    long long valueFromText(const QString &text, bool *isValid) const;
    QString textFromValue(long long value, int base) const;

protected:
    void leaveEvent ( QEvent * event );
    int getBase(const QString &text) const;
    bool hasPrefix(const QString &text) const;

private:
    static QString PREFIX;
    QRegExpValidator *validator;
};