C++ GUI Qt4编程(11)-5.1hexSpinbox

1. hexspinbox.cpp

 1 /*
 2  * The spin box supports integer values but can be extended to use different strings 
 3  * with validate(), textFromValue() and valueFromText().
 4  */
 5 #include "hexspinbox.h"
 6 
 7 #include <QRegExpValidator>
 8 
 9 HexSpinBox::HexSpinBox(QWidget *parent)
10     : QSpinBox(parent)
11 {
12     setRange(0, 255);        /*设置默认范围是从0到255*/
13     validator = new QRegExpValidator(QRegExp("[0-9A-Fa-f]{1,8}"), this);
14 }
15 
16 QValidator::State HexSpinBox::validate(QString &text, int &pos) const
17 {
18     return validator->validate(text, pos);
19 }
20 
21 QString HexSpinBox::textFromValue(int value) const
22 {
23     return QString::number(value, 16).toUpper();
24 }
25 
26 int HexSpinBox::valueFromText(const QString &text) const
27 {
28     bool ok;
29     return text.toInt(&ok, 16);
30 }

 

2. hexspinbox.h

 1 #ifndef HEXSPINBOX_H
 2 #define HEXSPINBOX_H
 3 
 4 #include <QSpinBox>
 5 
 6 class QRegExpValidator;
 7 
 8 class HexSpinBox : public QSpinBox
 9 {
10     Q_OBJECT
11     
12 public:
13     HexSpinBox(QWidget *parent = 0);
14     
15 protected:
16     QValidator::State validate(QString &text, int &pos) const;
17     QString textFromValue(int value) const;
18     int valueFromText(const QString &text) const;
19     
20 private:
21     QRegExpValidator *validator;
22 };
23 
24 
25 #endif    /*HEXSPINBOX_H*/

3. main.cpp

 1 #include <QApplication>
 2 
 3 #include "hexspinbox.h"
 4 
 5 int main(int argc, char *argv[])
 6 {
 7     QApplication app(argc, argv);
 8     
 9     HexSpinBox *hexSpinBox = new HexSpinBox;
10     hexSpinBox->show();
11     
12     return app.exec();
13 }

4. 效果

 

posted @ 2017-07-23 21:52  seifguo  阅读(323)  评论(0)  编辑  收藏  举报