An IP address widget for Qt, Similar to MFC's IP address control

I am looking for a widget in Qt which is similar to MFC's IP address control. Does anyone know of such a widget, or perhaps how I can create one?

Answers


I have no idea what's an MFC IP Widget, but looks like it is a Widget to enter an IP address. You need to use a QLineEdit with a inputMask "000.000.000.000;_"

QLineEdit *ipEdit = new QLineEdit();
ipEdit->setInputMask("000.000.000.000;_");
ipEdit->show();

A little improvement of jpo38's code...

#include <QFrame>
#include <QLineEdit>
#include <QIntValidator>
#include "stdint.h"
#include <QHBoxLayout>
#include <QFont>
#include <QLabel>
#include <QKeyEvent>


class IPCtrl : public QFrame
{
    Q_OBJECT

public:
    IPCtrl(QWidget *parent = 0);
    ~IPCtrl();

    virtual bool eventFilter( QObject *obj, QEvent *event );

public slots:
    void slotTextChanged( QLineEdit* pEdit );

signals:
    void signalTextChanged( QLineEdit* pEdit );

private:
    enum
    {
        QTUTL_IP_SIZE   = 4,// число октетов IP адресе
        MAX_DIGITS      = 3 // число символов в LineEdit
    };

    QLineEdit *(m_pLineEdit[QTUTL_IP_SIZE]);
    void MoveNextLineEdit (int i);
    void MovePrevLineEdit (int i);
};


IPCtrl::IPCtrl(QWidget *parent) : QFrame(parent)
{
    setFrameShape( QFrame::StyledPanel );
    setFrameShadow( QFrame::Sunken );

    QHBoxLayout* pLayout = new QHBoxLayout( this );
    setLayout( pLayout );
    pLayout->setContentsMargins( 0, 0, 0, 0 );
    pLayout->setSpacing( 0 );

    for ( int i = 0; i != QTUTL_IP_SIZE; ++i )
    {
        if ( i != 0 )
        {
            QLabel* pDot = new QLabel( ".", this );
            pDot->setStyleSheet( "background: white" );
            pLayout->addWidget( pDot );
            pLayout->setStretch( pLayout->count(), 0 );
        }

        m_pLineEdit[i] = new QLineEdit( this );
        QLineEdit* pEdit = m_pLineEdit[i];
        pEdit->installEventFilter( this );

        pLayout->addWidget( pEdit );
        pLayout->setStretch( pLayout->count(), 1 );

        pEdit->setFrame( false );
        pEdit->setAlignment( Qt::AlignCenter );

        QFont font = pEdit->font();
        font.setStyleHint( QFont::Monospace );
        font.setFixedPitch( true );
        pEdit->setFont( font );

        QRegExp rx ( "^(0|[1-9]|[1-9][0-9]|1[0-9][0-9]|2([0-4][0-9]|5[0-5]))$" );
        QValidator *validator = new QRegExpValidator(rx, pEdit);
        pEdit->setValidator( validator );

    }

    setMaximumWidth( 30 * QTUTL_IP_SIZE );

    connect( this, SIGNAL(signalTextChanged(QLineEdit*)),
             this, SLOT(slotTextChanged(QLineEdit*)),
             Qt::QueuedConnection );
}

IPCtrl::~IPCtrl()
{

}

void IPCtrl::slotTextChanged( QLineEdit* pEdit )
{
    for ( unsigned int i = 0; i != QTUTL_IP_SIZE; ++i )
    {
        if ( pEdit == m_pLineEdit[i] )
        {
            if ( ( pEdit->text().size() == MAX_DIGITS &&  pEdit->text().size() == pEdit->cursorPosition() ) || ( pEdit->text() == "0") )
            {
                // auto-move to next item
                if ( i+1 != QTUTL_IP_SIZE )
                {
                   m_pLineEdit[i+1]->setFocus();
                   m_pLineEdit[i+1]->selectAll();
                }
            }
        }
    }
}

bool IPCtrl::eventFilter(QObject *obj, QEvent *event)
{
    bool bRes = QFrame::eventFilter(obj, event);

    if ( event->type() == QEvent::KeyPress )
    {
        QKeyEvent* pEvent = dynamic_cast<QKeyEvent*>( event );
        if ( pEvent )
        {
            for ( unsigned int i = 0; i != QTUTL_IP_SIZE; ++i )
            {
                QLineEdit* pEdit = m_pLineEdit[i];
                if ( pEdit == obj )
                {
                    switch ( pEvent->key() )
                    {
                    case Qt::Key_Left:
                        if ( pEdit->cursorPosition() == 0 )
                        {
                            // user wants to move to previous item
                            MovePrevLineEdit(i);
                        }
                        break;

                    case Qt::Key_Right:
                        if ( pEdit->text().isEmpty() || (pEdit->text().size() == pEdit->cursorPosition()) )
                        {
                            // user wants to move to next item
                            MoveNextLineEdit(i);
                        }
                        break;

                    case Qt::Key_0:
                        if ( pEdit->text().isEmpty() || pEdit->text() == "0" )
                        {
                            pEdit->setText("0");
                            // user wants to move to next item
                            MoveNextLineEdit(i);
                        }
                        emit signalTextChanged( pEdit );
                        break;

                    case Qt::Key_Backspace:
                        if ( pEdit->text().isEmpty() || pEdit->cursorPosition() == 0)
                        {
                            // user wants to move to previous item
                            MovePrevLineEdit(i);
                        }
                        break;

                    case Qt::Key_Comma:
                    case Qt::Key_Period:
                        MoveNextLineEdit(i);
                        break;

                    default:
                        emit signalTextChanged( pEdit );
                        break;

                    }
                }
            }
        }
    }

    return bRes;
}

void IPCtrl::MoveNextLineEdit(int i)
{
    if ( i+1 != QTUTL_IP_SIZE )
    {
        m_pLineEdit[i+1]->setFocus();
        m_pLineEdit[i+1]->setCursorPosition( 0 );
        m_pLineEdit[i+1]->selectAll();
    }
}

void IPCtrl::MovePrevLineEdit(int i)
{
    if ( i != 0 )
    {
        m_pLineEdit[i-1]->setFocus();
        m_pLineEdit[i-1]->setCursorPosition( m_pLineEdit[i-1]->text().size() );
        //m_pLineEdit[i-1]->selectAll();
    }
}

I agree with little_su: QLineEdit with input mask does not look and behaves as nice as the standard Windows IP control. I worked out a complete QWidget-based IP control embedding 4 QLineEdit and 3 QLabel (for dots). It just looks and behaves perfectly as MFC/Windows IP controls.

Here is the code:

class IPCtrl : public QFrame
{
    typedef QFrame baseClass;

    Q_OBJECT

public:
    IPCtrl(QWidget *parent);
    ~IPCtrl();

#define QTUTL_IP_SIZE 4

    virtual bool eventFilter( QObject *obj, QEvent *event );

public slots:
    void slotTextChanged( QLineEdit* pEdit );

signals:
    void signalTextChanged( QLineEdit* pEdit );

private:
    QLineEdit *(m_pLineEdit[QTUTL_IP_SIZE]);

    static std::string getIPItemStr( unsigned char item );   
};

class IPItemValidator : public QIntValidator 
{
public:
    IPItemValidator( QObject* parent ) : QIntValidator( parent )
    {
        setRange( 0, UCHAR_MAX );
    }
    ~IPItemValidator() {}

    virtual void fixup( QString & input ) const
    {
        if ( input.isEmpty() )
            input = "0";
    }
};

IPCtrl::IPCtrl(QWidget *parent) : baseClass(parent)
{
    setFrameShape( QFrame::StyledPanel );
    setFrameShadow( QFrame::Sunken );

    QHBoxLayout* pLayout = new QHBoxLayout( this );
    setLayout( pLayout );
    pLayout->setContentsMargins( 0, 0, 0, 0 );
    pLayout->setSpacing( 0 );

    for ( int i = 0; i != QTUTL_IP_SIZE; ++i )
    {
        if ( i != 0 )
        {
            QLabel* pDot = new QLabel( ".", this );
            pDot->setStyleSheet( "background: white" );
            pLayout->addWidget( pDot );
            pLayout->setStretch( pLayout->count(), 0 );
        }

        m_pLineEdit[i] = new QLineEdit( this );
        QLineEdit* pEdit = m_pLineEdit[i];
        pEdit->installEventFilter( this );

        pLayout->addWidget( pEdit );
        pLayout->setStretch( pLayout->count(), 1 );

        pEdit->setFrame( false );
        pEdit->setAlignment( Qt::AlignCenter );

        QFont font = pEdit->font();
        font.setStyleHint( QFont::Monospace );
        font.setFixedPitch( true );
        pEdit->setFont( font );

        pEdit->setValidator( new IPItemValidator( pEdit ) );
    }

    setMaximumWidth( 30 * QTUTL_IP_SIZE );

    connect( this, SIGNAL(signalTextChanged(QLineEdit*)),
             this, SLOT(slotTextChanged(QLineEdit*)),
             Qt::QueuedConnection );
}

IPCtrl::~IPCtrl()
{

}

std::string IPCtrl::getIPItemStr( unsigned char item )
{
    std::strstream str;
    str << (int) item;
    str << std::ends;
    return str.str();
}

void IPCtrl::slotTextChanged( QLineEdit* pEdit )
{
    for ( unsigned int i = 0; i != QTUTL_IP_SIZE; ++i )
    {
        if ( pEdit == m_pLineEdit[i] )
        {
            if ( pEdit->text().size() == getIPItemStr( UCHAR_MAX ).size() &&
                 pEdit->text().size() == pEdit->cursorPosition() )
            {
                // auto-move to next item
                if ( i+1 != QTUTL_IP_SIZE )
                {
                   m_pLineEdit[i+1]->setFocus();
                   m_pLineEdit[i+1]->selectAll();
                }                   
            }
        }
    }
}

bool IPCtrl::eventFilter(QObject *obj, QEvent *event)
{
    bool bRes = baseClass::eventFilter(obj, event);

    if ( event->type() == QEvent::KeyPress )
    {
        QKeyEvent* pEvent = dynamic_cast<QKeyEvent*>( event );
        if ( pEvent )
        {
            for ( unsigned int i = 0; i != QTUTL_IP_SIZE; ++i )
            {
                QLineEdit* pEdit = m_pLineEdit[i];
                if ( pEdit == obj )
                {
                    switch ( pEvent->key() )
                    {
                    case Qt::Key_Left:
                        {
                            if ( pEdit->cursorPosition() == 0 )
                            {
                                // user wants to move to previous item
                                if ( i != 0 )
                                {
                                    m_pLineEdit[i-1]->setFocus();
                                    m_pLineEdit[i-1]->setCursorPosition( m_pLineEdit[i-1]->text().size() );
                                }
                            }
                            break;
                        }
                    case Qt::Key_Right:
                        {
                            if ( pEdit->text().isEmpty() ||
                                 (pEdit->text().size() == pEdit->cursorPosition()) )
                            {
                                // user wants to move to next item
                                if ( i+1 != QTUTL_IP_SIZE )
                                {
                                    m_pLineEdit[i+1]->setFocus();
                                    m_pLineEdit[i+1]->setCursorPosition( 0 );
                                }
                            }
                            break;
                        }
                    default:
                        {
                            emit signalTextChanged( pEdit );
                        }
                    }

                    break;
                }
            }
        }
    }

    return bRes;
}

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