Qt实现的IP地址输入控件

// MyIpPartLineEdit.h 

#pragma once 

#include  

class QWidget; 
class QFocusEvent; 
class QKeyEvent; 

class MyIpPartLineEdit : public QLineEdit 
{ 
    Q_OBJECT 
public: 
    MyIpPartLineEdit(QWidget *parent = 0); 
    ~MyIpPartLineEdit(void); 

    void set_nexttab_edit(QLineEdit *nexttab) { next_tab_ = nexttab; } 

protected: 
    virtual void focusInEvent(QFocusEvent *e); 
    virtual    void keyPressEvent(QKeyEvent *event);   

private slots: 
    void text_edited(const QString& text); 

private: 
    QLineEdit *next_tab_; 
}; 

// MyIpPartLineEdit.cpp 
#include "MyIpPartLineEdit.h" 
#include  
#include  

MyIpPartLineEdit::MyIpPartLineEdit(QWidget *parent/* = 0*/) 
: QLineEdit(parent) 
{ 
    next_tab_ = NULL; 

    this->setMaxLength(3); 
    this->setFrame(false); 
    this->setAlignment(Qt::AlignCenter); 

    QValidator *validator = new QIntValidator(0, 255, this); 
    this->setValidator(validator); 

    connect(this, SIGNAL(textEdited(const QString&)), this, SLOT(text_edited(const QString&))); 
} 

MyIpPartLineEdit::~MyIpPartLineEdit(void) 
{ 
} 

void MyIpPartLineEdit::focusInEvent(QFocusEvent *e) 
{ 
    this->selectAll(); 
    QLineEdit::focusInEvent(e); 
} 

void MyIpPartLineEdit::keyPressEvent(QKeyEvent *event) 
{ 
    if (event->key() == Qt::Key_Period) 
    { 
        if (next_tab_) 
        { 
            next_tab_->setFocus(); 
            next_tab_->selectAll(); 
        } 
    } 
    QLineEdit::keyPressEvent(event); 
} 

void MyIpPartLineEdit::text_edited(const QString& text) 
{ 
    QIntValidator v(0, 255, this); 
    QString ipaddr = text; 
    int pos = 0; 
    QValidator::State state = v.validate(ipaddr, pos);  
    if (state == QValidator::Acceptable) 
    { 
        if (ipaddr.size() > 1) 
        { 
            if (ipaddr.size() == 2) 
            { 
                int ipnum = ipaddr.toInt(); 
                 
                if (ipnum > 25) 
                { 
                    if (next_tab_) 
                    { 
                        next_tab_->setFocus(); 
                        next_tab_->selectAll(); 
                    }     
                } 
            } 
            else 
            { 
                if (next_tab_) 
                { 
                    next_tab_->setFocus(); 
                    next_tab_->selectAll(); 
                }     
            } 
        } 
    } 
}

// MyIpAddrEdit.h 
#pragma once 

#include  

class QLineEdit; 
class QLabel; 
class MyIpPartLineEdit; 

class MyIpAddrEdit : public QWidget 
{ 
    Q_OBJECT 
public: 
    MyIpAddrEdit(QWidget* pParent = 0); 
    ~MyIpAddrEdit(); 

    void settext(const QString &text); 
    QString text(); 
    void setStyleSheet(const QString &styleSheet); 

signals: 
    void textchanged(const QString& text); 
    void textedited(const QString &text); 

private slots: 
    void textchangedslot(const QString& text); 
    void texteditedslot(const QString &text); 

private: 
    MyIpPartLineEdit *ip_part1_; 
    MyIpPartLineEdit *ip_part2_; 
    MyIpPartLineEdit *ip_part3_; 
    QLineEdit *ip_part4_; 

    QLabel *labeldot1_; 
    QLabel *labeldot2_;     
    QLabel *labeldot3_; 
};

// MyIpAddrEdit.cpp 
#include "MyIpAddrEdit.h" 
#include  
#include  
#include "MyIpPartLineEdit.h" 

MyIpAddrEdit::MyIpAddrEdit(QWidget* pParent /* = 0 */) 
: QWidget(pParent) 
{ 
    ip_part1_ = new MyIpPartLineEdit(this); 
    ip_part2_ = new MyIpPartLineEdit(this); 
    ip_part3_ = new MyIpPartLineEdit(this); 
    ip_part4_ = new MyIpPartLineEdit(this); 

    labeldot1_ = new QLabel(this); 
    labeldot2_ = new QLabel(this); 
    labeldot3_ = new QLabel(this); 

    ip_part1_->setGeometry(QRect(0, 0, 30, 20)); 
    ip_part2_->setGeometry(QRect(30, 0, 30, 20)); 
    ip_part3_->setGeometry(QRect(60, 0, 30, 20)); 
    ip_part4_->setGeometry(QRect(90, 0, 30, 20)); 

    labeldot1_->setText(" ."); 
    labeldot1_->setGeometry(QRect(27, 1, 6, 18)); 
    labeldot1_->setAlignment(Qt::AlignCenter); 

    labeldot2_->setText(" ."); 
    labeldot2_->setGeometry(QRect(57, 1, 6, 18)); 
    labeldot2_->setAlignment(Qt::AlignCenter); 

    labeldot3_->setText(" ."); 
    labeldot3_->setGeometry(QRect(87, 1, 6, 18)); 
    labeldot3_->setAlignment(Qt::AlignCenter); 

    QWidget::setTabOrder(ip_part1_, ip_part2_); 
    QWidget::setTabOrder(ip_part2_, ip_part3_); 
    QWidget::setTabOrder(ip_part3_, ip_part4_); 
    ip_part1_->set_nexttab_edit(ip_part2_); 
    ip_part2_->set_nexttab_edit(ip_part3_); 
    ip_part3_->set_nexttab_edit(ip_part4_); 


    connect(ip_part1_, SIGNAL(textChanged(const QString&)), this, SLOT(textchangedslot(const QString&))); 
    connect(ip_part2_, SIGNAL(textChanged(const QString&)), this, SLOT(textchangedslot(const QString&))); 
    connect(ip_part3_, SIGNAL(textChanged(const QString&)), this, SLOT(textchangedslot(const QString&))); 
    connect(ip_part4_, SIGNAL(textChanged(const QString&)), this, SLOT(textchangedslot(const QString&))); 

    connect(ip_part1_, SIGNAL(textEdited (const QString&)), this, SLOT(texteditedslot(const QString&))); 
    connect(ip_part2_, SIGNAL(textEdited (const QString&)), this, SLOT(texteditedslot(const QString&))); 
    connect(ip_part3_, SIGNAL(textEdited (const QString&)), this, SLOT(texteditedslot(const QString&))); 
    connect(ip_part4_, SIGNAL(textEdited (const QString&)), this, SLOT(texteditedslot(const QString&))); 
     
} 

MyIpAddrEdit::~MyIpAddrEdit() 
{ 

} 

void MyIpAddrEdit::textchangedslot(const QString& /*text*/) 
{ 
    QString ippart1, ippart2, ippart3, ippart4; 
    ippart1 = ip_part1_->text(); 
    ippart2 = ip_part2_->text(); 
    ippart3 = ip_part3_->text(); 
    ippart4 = ip_part4_->text(); 

    QString ipaddr = QString("%1.%2.%3.%4") 
                     .arg(ippart1) 
                     .arg(ippart2) 
                     .arg(ippart3) 
                     .arg(ippart4); 

    emit textchanged(ipaddr); 
} 

void MyIpAddrEdit::texteditedslot(const QString &/*text*/) 
{ 
    QString ippart1, ippart2, ippart3, ippart4; 
    ippart1 = ip_part1_->text(); 
    ippart2 = ip_part2_->text(); 
    ippart3 = ip_part3_->text(); 
    ippart4 = ip_part4_->text(); 

    QString ipaddr = QString("%1.%2.%3.%4") 
        .arg(ippart1) 
        .arg(ippart2) 
        .arg(ippart3) 
        .arg(ippart4); 

    emit textedited(ipaddr); 
} 

void MyIpAddrEdit::settext(const QString &text) 
{ 
    QString ippart1, ippart2, ippart3, ippart4; 
    QString qstring_validate = text; 

    // IP地址验证 
    QRegExp regexp("((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.){3}(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)"); 
    QRegExpValidator regexp_validator(regexp, this); 
    int nPos = 0; 
    QValidator::State state = regexp_validator.validate(qstring_validate, nPos); 
    // IP合法 
    if (state == QValidator::Acceptable) 
    { 
        QStringList ippartlist = text.split("."); 
     
        int strcount = ippartlist.size(); 
        int index = 0; 
        if (index < strcount) 
        { 
            ippart1 = ippartlist.at(index); 
        } 
        if (++index < strcount) 
        { 
            ippart2 = ippartlist.at(index); 
        } 
        if (++index < strcount) 
        { 
            ippart3 = ippartlist.at(index); 
        } 
        if (++index < strcount) 
        { 
            ippart4 = ippartlist.at(index); 
        } 
    } 

    ip_part1_->setText(ippart1); 
    ip_part2_->setText(ippart2); 
    ip_part3_->setText(ippart3); 
    ip_part4_->setText(ippart4); 
} 

QString MyIpAddrEdit::text() 
{ 
    QString ippart1, ippart2, ippart3, ippart4; 
    ippart1 = ip_part1_->text(); 
    ippart2 = ip_part2_->text(); 
    ippart3 = ip_part3_->text(); 
    ippart4 = ip_part4_->text(); 

    return QString("%1.%2.%3.%4") 
        .arg(ippart1) 
        .arg(ippart2) 
        .arg(ippart3) 
        .arg(ippart4); 
} 

void MyIpAddrEdit::setStyleSheet(const QString &styleSheet) 
{ 
    ip_part1_->setStyleSheet(styleSheet); 
    ip_part2_->setStyleSheet(styleSheet); 
    ip_part3_->setStyleSheet(styleSheet); 
    ip_part4_->setStyleSheet(styleSheet); 
}

//main.cpp
#include  
#include  
#include "MyIpAddrEdit.h"
int main(int argc, char *argv[]) 
{ 
    QApplication app(argc, argv);
    MyIpAddrEdit *ipAddr = new MyIpAddrEdit(); 
    ipAddr->settext("127.0.0.1"); 
    ipAddr->show();
    return app.exec(); 
}