QT沒有提供一個完整的IP地址控件，

1. 可以使用QLineEdit簡單的實現
??? QRegExp regExp("((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.){3}(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)");
??? QRegExpValidator *pValidator =?new QRegExpValidator(regExp, this);
??? QLineEdit *lineEdit =?new QLineEdit(this);
??? lineEdit->setValidator(new QRegExpValidator(pValidator, this));
??? lineEdit->setInputMask("000.000.000.000;"); 但是上面的輸入時沒有window的IP地址控件好用。所以自己就用4個QLineEdit封裝了一個，用起來好多了，
下面是代碼：
// MyIpPartLineEdit.h
#pragma once

#include <QLineEdit>

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 <QIntValidator>
#include <QKeyEvent>

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 <QWidget>

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 <QRegExpValidator>
#include <QLabel>
#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地址驗證
??? 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);
}

?

#include <QApplication>
#include <QDialog>
#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();
}

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