C++ GUI Qt4编程(11)-5.1hexSpinbox

1. hexspinbox.cpp

 /*
  * The spin box supports integer values but can be extended to use different strings
  * with validate(), textFromValue() and valueFromText().
  */
 #include "hexspinbox.h"

 #include <QRegExpValidator>

 HexSpinBox::HexSpinBox(QWidget *parent)
     : QSpinBox(parent)
 {
     setRange(, );        /*设置默认范围是从0到255*/
     validator = new QRegExpValidator(QRegExp("[0-9A-Fa-f]{1,8}"), this);
 }

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

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

 int HexSpinBox::valueFromText(const QString &text) const
 {
     bool ok;
     return text.toInt(&ok, );
 }

2. hexspinbox.h

 #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;
     QString textFromValue(int value) const;
     int valueFromText(const QString &text) const;

 private:
     QRegExpValidator *validator;
 };

 #endif    /*HEXSPINBOX_H*/

3. main.cpp

 #include <QApplication>

 #include "hexspinbox.h"

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);

     HexSpinBox *hexSpinBox = new HexSpinBox;
     hexSpinBox->show();

     return app.exec();
 }

4. 效果