Undefined reference to QWidget::event(QKeyEvent *) in custom classes

[anda_skoa]

Nope, no such method:

#> grep QKeyEvent /usr/include/x86_64-linux-gnu/qt5/QtWidgets/qwidget.h
 
class QKeyEvent;
    virtual void keyPressEvent(QKeyEvent *);
    virtual void keyReleaseEvent(QKeyEvent *);

#> grep QKeyEvent /usr/include/x86_64-linux-gnu/qt5/QtWidgets/qwidget.h

class QKeyEvent;
    virtual void keyPressEvent(QKeyEvent *);
    virtual void keyReleaseEvent(QKeyEvent *);

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#> grep QKeyEvent /usr/include/qt4/QtGui/qwidget.h                     
 
class QKeyEvent;
    virtual void keyPressEvent(QKeyEvent *);
    virtual void keyReleaseEvent(QKeyEvent *);

#> grep QKeyEvent /usr/include/qt4/QtGui/qwidget.h                     

class QKeyEvent;
    virtual void keyPressEvent(QKeyEvent *);
    virtual void keyReleaseEvent(QKeyEvent *);

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Cheers,
_

[Toniy]

Strange... But how are these differences between yours and mine possible?
Anyway, thanks: situation is more clear now...

And how should I act in this situation? Would it be wise to comment these lines in my header or patching third parties' files is bad practicing? If that is so, what can be done?
However, why does compiler not cry about it for native classes like QWidget? And how could these functions appear into file?

[jefftee]

No virtual void event(QKeyEvent *) either in my mac Qt 5.5.0 installation either:

imac01:~/Qt/5.5.0$ grep QKeyEvent /Users/jefft/Qt/5.5.0/clang_64/lib/QtWidgets.framework/Versions/5/Headers/qwidget.h
class QKeyEvent;
    virtual void keyPressEvent(QKeyEvent *);
    virtual void keyReleaseEvent(QKeyEvent *);

imac01:~/Qt/5.5.0$ grep QKeyEvent /Users/jefft/Qt/5.5.0/clang_64/lib/QtWidgets.framework/Versions/5/Headers/qwidget.h
class QKeyEvent;
    virtual void keyPressEvent(QKeyEvent *);
    virtual void keyReleaseEvent(QKeyEvent *);

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Seems something is wonky with your Qt installation. If you can't remove/install the Qt packages that installed into /usr, can you perhaps install 4.8.5 into your home directory and see if it matches what you have installed into /usr?

[Toniy]

All right. I have collected some statistics on different Qt versions and there is no any of these functions. How they appeared and more important how they used to work before -- here is the question.
I'll reply here when I find source sample that was used for Qt installation on my computer and check it.

Thanks for the quickest responses.

[Toniy]

I didn't find sources but deleted that function and replaced it with ones recommended in that thread (in file "qwidget.h") and problem has been solved.
Seems like I accidentally corrupted that file myself.

So, maybe that thread will be useful for someone and he/she will solve similar problem quicker

[d_stranz]

Seems like I accidentally corrupted that file myself.

If I were you, I would re-install Qt instead of relying on your memory and hand-editing a really core Qt header file. Who knows what else you've "accidentally corrupted" that might come back to bite you later?

You are fortunate that you seem to be using a binary distribution of Qt, and the linker caught your error.