自定义窗口部件--Custom widget

#ifndef HEXSPINBOX_H
#define HEXSPINBOX_H

#include <QSpinBox>

class QRegExpValidator;

class HexSpinBox:public QSpinBox
{
    Q_OBJECT

public:
    HexSpinBox(QWidget *parent);

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

private:
    QRegExpValidator *validator;

};

#endif // HEXSPINBOX_H

#include <QtGui>
#include "HexSpinBox.h"

HexSpinBox::HexSpinBox(QWidget *parent):QSpinBox(parent)
{
    setRange(0,255);  //输入的默认范围
    validator=new QRegExpValidator(QRegExp("[0-9a-fA-F]{1,8}"),this); //接受1到8个字符
}

QValidator::State HexSpinBox::validate(QString &text, int &pos) const
{
    return validator->validate(text,pos);   //检查输入是否合法
}

QString HexSpinBox::textFromValue(int val) const
{
    return  QString::number(val,16).toUpper();   //把整数转成字符串，用来更新微调框
}

int HexSpinBox::valueFromText(const QString &text) const
{
    bool ok;
    return  text.toInt(&ok,16); //如果字符串不是有效的十六进制数：ok为false；
}