Important: Please read the Qt Code of Conduct -

Capture mouse click() on QLineEdit

  • Hello folks, I tried to make an event filter for capture the click mouse on a QLineEdit, I getted the code from google, but it does not work and i don't understand why. Help please
    Any help will be wellcomed


    class getmsg : public QWidget
        getmsg(QWidget *parent = 0, int _maxX=0, int _maxY=0, qint8 _nMsg = 0);
        QLineEdit *askCh;
        bool getmsg::eventFilter(QObject *object, QEvent* event);


    getmsg::getmsg(QWidget *parent, int _maxX, int _maxY, qint8 _nMsg)
        : QWidget(parent),maxX(_maxX),maxY(_maxY),nMsg(_nMsg)
        askCh = new QLineEdit(this);
    bool getmsg::eventFilter(QObject *object, QEvent *event)
        if(object == askCh && event->type() == QEvent::MouseClick) {
            qDebug() << "You have clicked";
            return false; // lets the event continue to the edit
        return false;

    Tha console said

    error: C2027: use of undefined type 'QEvent'
    see declaration of 'QEvent'
    error: C2227: left of '->type' must point to class/struct/union/generic type
    error: C2065: 'MouseClick' : undeclared identifier

    Thanks in advance

  • Lifetime Qt Champion


    #include <QEvent>

  • @yczo
    The QEvent Documentation says

    QEvent::MouseButtonPress 2 Mouse press (QMouseEvent)

  • thank you but I'am so newbie, and I don't understand that
    I tryed

    if(object == askCh && event->type() == QEvent::MouseButtonPress) {

    but It does not work :-(

  • Lifetime Qt Champion

    Did you add

    #include <QEvent>

    in the cpp file?

  • yes, in "getmsg.h"

  • Ok, okkk Solved, I'm sorry, i forget the == on tests
    if(object == askCh && event->type() == QEvent::MouseButtonPress) {

    Thank you very much

  • @yczo

    Good to hear that it works now for you.
    Please do not forget to mark the question as Solved.

Log in to reply