5.1 自定义Qt窗口部件

//HexSpinBox.cpp
#ifndef HEXSPINBOX_H
#define HEXSPINBOX_H
#include <QSpinBox>
class HexSpinBox : public QSpinBox
{
    Q_OBJECT
public:
    explicit HexSpinBox(QWidget *parent = 0);
protected:
    QValidator::State validate(QString &input, int &pos) const;
    int valueFromText(const QString &text) const;
    QString textFromValue(int val) const;
signals:
public slots:
private:
    QRegExpValidator *m_pValidator;
};
#endif // HEXSPINBOX_H

//HexSpinBox.cpp
#include <QtGui>
#include "HexSpinBox.h"
HexSpinBox::HexSpinBox(QWidget *parent) :
    QSpinBox(parent),
    m_pValidator(new QRegExpValidator(QRegExp("[0-9A-Fa-f]{1,8}"), this))
{
    setRange(0, 255);
}
//返回输入值是否有效
//Invalid       无效
//Intermediate  部分有效
//Acceptable    有效
QValidator::State HexSpinBox::validate(QString &input, int &pos) const
{
    return m_pValidator->validate(input, pos);
}
//字符串转为数值
//在输入框输入时被调用
int HexSpinBox::valueFromText(const QString &text) const
{
    bool ok;
    return text.toInt(&ok, 16);
}
//数值转为字符串
//点击微调框上下按钮时被调用
QString HexSpinBox::textFromValue(int val) const
{
    return QString::number(val, 16).toUpper();
}

//main.cpp
#include <QApplication>
#include "HexSpinBox.h"
int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    HexSpinBox spinBox;
    spinBox.show();
    return app.exec();
}

图片:5.1.png