QT没有提供一个完整的IP地址控件，
1. 可以使用QLineEdit简单的实现
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;");
但是上面的输入时没有window的IP地址控件好用。所以自己就用4个QLineEdit封装了一个，用起来好多了，
下面是代码：
// 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);
}
下面是调用方法
#include <QApplication>
#include <QDialog>
#include "MyIpAddrEdit.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QDialog *my_dialog = new QDialog;
MyIpAddrEdit *ipAddr = new MyIpAddrEdit(my_dialog);
ipAddr->settext("127.0.0.1");
my_dialog->show();
return app.exec();
}