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Home/ Questions/Q 639529
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T20:51:10+00:00 2026-05-13T20:51:10+00:00

I have installed Qt and Qt for VS plugin. Everything works fine, UI applications

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I have installed Qt and Qt for VS plugin. Everything works fine, UI applications compile and run that’s ok, but connecting signals and slots doesn’t. I have Q_OBJECT in my class and for connecting I am using this code in constructor:

connect(ui.mainTableView, SIGNAL(activated(const QModelIndex &)),
        this, SLOT(showDetail(const QModelIndex &)));

EDIT:

showDetail method:

void MyClass::showDetail(const QModelIndex &index)
{
    this->setWindowTitle("it works");
}

window title is not changed and breakpoint is not reached.

moc files are generated in Generated Files directory, but moc file of that class is empty (others not), I think that it is because the class has no signal, but only one slot.

even connections generated by Designer don’t work and the call of connect method returns true.

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  1. Editorial Team
    Editorial Team
    2026-05-13T20:51:10+00:00Added an answer on May 13, 2026 at 8:51 pm

    RESULT:

    Oh no it turns out to be a silly question, thanks everybody, all answers pushed me towards the solution, but the last step was to find out that on my platform items are activated only by double-click, not single. Sorry

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