[网络协议]Qt自定义IP输入样式

头文件: ip_input_edit.h

#ifndef IPLINEEDIT_H
#define IPLINEEDIT_H

#include <QLineEdit>
#include <QLabel>
#include <QWidget>
#include <QFocusEvent>
#include <QKeyEvent>

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

    void SetPreEdit(QLineEdit *pre);
    void SetNextEdit(QLineEdit *next);
    
protected:
    void focusInEvent(QFocusEvent *event);
    void keyPressEvent(QKeyEvent *event);

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

private:
    QLineEdit *preEdit;
    QLineEdit *nextEdit;
};


class IPLineEdit : public QFrame
{
    Q_OBJECT

public:
    IPLineEdit(QWidget *parent = 0);
    ~IPLineEdit();
    QString GetText();
    void SetStyleSheet(const QString &styleSheet);
public slots:
    void setText(const QString &text);
signals:
    void textChanged(const QString &text);
    void textEdited(const QString &text);

private slots:
    void OnTextChanged(const QString &text);
    void OnTextEdited(const QString &text);

private:
    IpPartLineEdit * pIpPart1;
    IpPartLineEdit * pIpPart2;
    IpPartLineEdit * pIpPart3;
    IpPartLineEdit * pIpPart4;

    QLabel * pDot1;
    QLabel * pDot2;
    QLabel * pDot3;
};

#endif

源文件: ip_input_edit.cpp

#include <QRegExpValidator>
#include <QLayout>

#include "ip_input_edit.h"

IPLineEdit::IPLineEdit(QWidget *parent) :
    QFrame(parent)
{
    this->setFrameShape(QFrame::Panel);
    pIpPart1 = new IpPartLineEdit(this);
    pIpPart2 = new IpPartLineEdit(this);
    pIpPart3 = new IpPartLineEdit(this);
    pIpPart4 = new IpPartLineEdit(this);
    pIpPart1->setTextMargins(0,0,0,0);
    pIpPart2->setTextMargins(0,0,0,0);
    pIpPart3->setTextMargins(0,0,0,0);
    pIpPart4->setTextMargins(0,0,0,0);
    pDot1 = new QLabel(this);
    pDot2 = new QLabel(this);
    pDot3 = new QLabel(this);
    pDot1->setMargin(0);
    pDot2->setMargin(0);
    pDot3->setMargin(0);
    //QLayout *layout = this->layout();
    QLayout *layout = new QHBoxLayout();
    this->setLayout(layout);
    layout->setContentsMargins(0,0,0,0);
    //QLayout::SetNoConstraint
    //m_pIpPart1->setGeometry(QRect(0, 0, 42, 27));
    //m_pIpPart2->setGeometry(QRect(70, 0, 42, 27));
    //m_pIpPart3->setGeometry(QRect(140, 0, 42, 27));
    //m_pIpPart4->setGeometry(QRect(210, 0, 42, 27));

    pDot1->setText(".");
    //m_pDot1->setGeometry(QRect(48, 5, 16, 16));
    //m_pDot1->setAlignment(Qt::AlignCenter);

    pDot2->setText(".");
    //m_pDot2->setGeometry(QRect(118, 5, 16, 16));
    //m_pDot2->setAlignment(Qt::AlignCenter);

    pDot3->setText(".");
    //m_pDot3->setGeometry(QRect(188, 5, 16, 16));
    //m_pDot3->setAlignment(Qt::AlignCenter);
    layout->addWidget(pIpPart1);
    layout->addWidget(pDot1);
    layout->addWidget(pIpPart2);
    layout->addWidget(pDot2);
    layout->addWidget(pIpPart3);
    layout->addWidget(pDot3);
    layout->addWidget(pIpPart4);
    QWidget::setTabOrder(pIpPart1, pIpPart2);
    QWidget::setTabOrder(pIpPart2, pIpPart3);
    QWidget::setTabOrder(pIpPart3, pIpPart4);

    pIpPart1->SetNextEdit(pIpPart2);
    pIpPart2->SetNextEdit(pIpPart3);
    pIpPart3->SetNextEdit(pIpPart4);

    pIpPart2->SetPreEdit(pIpPart1);
    pIpPart3->SetPreEdit(pIpPart2);
    pIpPart4->SetPreEdit(pIpPart3);

    connect(pIpPart1, SIGNAL(textChanged(const QString&)), this, SLOT(OnTextChanged(const QString&)));
    connect(pIpPart2, SIGNAL(textChanged(const QString&)), this, SLOT(OnTextChanged(const QString&)));
    connect(pIpPart3, SIGNAL(textChanged(const QString&)), this, SLOT(OnTextChanged(const QString&)));
    connect(pIpPart4, SIGNAL(textChanged(const QString&)), this, SLOT(OnTextChanged(const QString&)));

    connect(pIpPart1, SIGNAL(textEdited(const QString&)), this, SLOT(OnTextEdited(const QString&)));
    connect(pIpPart2, SIGNAL(textEdited(const QString&)), this, SLOT(OnTextEdited(const QString&)));
    connect(pIpPart3, SIGNAL(textEdited(const QString&)), this, SLOT(OnTextEdited(const QString&)));
    connect(pIpPart4, SIGNAL(textEdited(const QString&)), this, SLOT(OnTextEdited(const QString&)));
}

IPLineEdit::~IPLineEdit()
{

}

void IPLineEdit::OnTextChanged(const QString &/*text*/)
{
    QString strIpPart1 = pIpPart1->text();
    QString strIpPart2 = pIpPart2->text();
    QString strIpPart3 = pIpPart3->text();
    QString strIpPart4 = pIpPart4->text();

    QString strIpAddr = QString("%1.%2.%3.%4")
            .arg(strIpPart1)
            .arg(strIpPart2)
            .arg(strIpPart3)
            .arg(strIpPart4);

    emit textChanged(strIpAddr);
}

void IPLineEdit::OnTextEdited(const QString &/*text*/)
{
    QString strIpPart1 = pIpPart1->text();
    QString strIpPart2 = pIpPart2->text();
    QString strIpPart3 = pIpPart3->text();
    QString strIpPart4 = pIpPart4->text();

    QString strIpAddr = QString("%1.%2.%3.%4")
            .arg(strIpPart1)
            .arg(strIpPart2)
            .arg(strIpPart3)
            .arg(strIpPart4);

    emit textEdited(strIpAddr);
}

void IPLineEdit::setText(const QString &text)
{
    QString strIpAddr = text;

    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 iPos = 0;

    QValidator::State state = regexp_validator.validate(strIpAddr, iPos);
    if(state != QValidator::Acceptable)
    {
        return ;
    }

    QStringList ipAddrList = text.split(".");
    //int iCount = ipAddrList.size();

    QString strIpPart1 = ipAddrList.at(0);
    QString strIpPart2 = ipAddrList.at(1);
    QString strIpPart3 = ipAddrList.at(2);
    QString strIpPart4 = ipAddrList.at(3);

    pIpPart1->setText(strIpPart1);
    pIpPart2->setText(strIpPart2);
    pIpPart3->setText(strIpPart3);
    pIpPart4->setText(strIpPart4);
}

QString IPLineEdit::GetText()
{
    QString strIpPart1 = pIpPart1->text();
    QString strIpPart2 = pIpPart2->text();
    QString strIpPart3 = pIpPart3->text();
    QString strIpPart4 = pIpPart4->text();

    return QString("%1.%2.%3.%4")
            .arg(strIpPart1)
            .arg(strIpPart2)
            .arg(strIpPart3)
            .arg(strIpPart4);
}

void IPLineEdit::SetStyleSheet(const QString &styleSheet)
{
    pIpPart1->setStyleSheet(styleSheet);
    pIpPart2->setStyleSheet(styleSheet);
    pIpPart3->setStyleSheet(styleSheet);
    pIpPart4->setStyleSheet(styleSheet);
}


IpPartLineEdit::IpPartLineEdit(QWidget *parent)
    : QLineEdit(parent)
{
    preEdit = nullptr;
    nextEdit = nullptr;

    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(OnTextEdited(const QString&)));
}

IpPartLineEdit::~IpPartLineEdit()
{
}

void IpPartLineEdit::SetPreEdit(QLineEdit *pre)
{
    preEdit = pre;
}

void IpPartLineEdit::SetNextEdit(QLineEdit *next)
{
    nextEdit = next;
}

void IpPartLineEdit::focusInEvent(QFocusEvent *event)
{
    this->selectAll();
    QLineEdit::focusInEvent(event);
}

void IpPartLineEdit::keyPressEvent(QKeyEvent *event)
{
    if(event->key() == Qt::Key_Period)
    {
        if(nextEdit &&
           (this->text().size()!=0) &&
           (!this->hasSelectedText()))
        {
            nextEdit->setFocus();
            nextEdit->selectAll();
        }
    }
    if(event->key() == Qt::Key_Backspace)
    {
        if(preEdit &&
           (this->text().size() == 0))
        {
            preEdit->setFocus();
            preEdit->setCursorPosition(preEdit->text().size() );
        }
    }
    QLineEdit::keyPressEvent(event);
}

void IpPartLineEdit::OnTextEdited(const QString & text)
{
    QIntValidator v(0, 255, this);
    QString ipAddr = text;
    int iPos = 0;

    QValidator::State state = v.validate(ipAddr, iPos);
    if(state != QValidator::Acceptable)
    {
        return ;
    }
    if(ipAddr.size() <= 1)
    {
        return ;
    }

    if(ipAddr.size() == 2)
    {
        int iIpNum = ipAddr.toInt();
        if(iIpNum > 25)
        {
            if(nextEdit)
            {
                nextEdit->setFocus();
                nextEdit->selectAll();
            }
        }
    }
    else
    {
        if(nextEdit)
        {
            nextEdit->setFocus();
            nextEdit->selectAll();
        }
    }
}

然后拖拽一个QFrame控件，右键提升为…