Question

I have a qdialog, with a buttonbox at the bottom; Why isn’t this slot not getting fired when a “signal” occurs? The code look like the following:

    std::unique_ptr<MW::GenStd> box(new MW::GenStd(&tOut, &tIn));
    box->ui.ChoiceButtons->addButton ("Ask",
        QDialogButtonBox::AcceptRole );
    box->ui.ChoiceButtons->addButton ("OverWrite",
        QDialogButtonBox::AcceptRole );
    box->ui.ChoiceButtons->addButton ("merge",
        QDialogButtonBox::AcceptRole );
    box->ui.ChoiceButtons->addButton ("Skip",
        QDialogButtonBox::RejectRole );

    QObject::connect(box->ui.ChoiceButtons, SIGNAL(clicked(QPushButton* b)), box.get(), SLOT(OnClick(QPushButton* b)));

    return box->exec();

Where MW::GenStd is a dialog box (and ui.ChoicButtons a buttonbox). The modal dialog is correctly displayed – however it doesn’t seem to interact at all.. Pressing the buttons doesn’t fire the event. The slot is declared like the following:

public slots:
    void OnClick(QPushButton* b) {
        auto s(b->text());
        if (s == "Merge") {
            setResult(2);
        } else if (s == "Overwrite") {
            setResult(1);
        } else if (s == "Skip") {
            setResult(0);
        } else if (s == "Ask") {
            setResult(3);
        }
    }

};

(I know it’s terribly to do such a string comparison here, but it’s just as a quick mock up test to validate the buttons). But debugging shows the function isn’t ever reached!

EDIT: as suggested looking at the output showed a culprit:
Object::connect: No such signal QDialogButtonBox::clicked(QPushButton*) in AskGUISupport.cpp:150
However that seems totally strange as the QDialogButtonBox does have a clicked signal? documentation

Answer 1

QDialogButtonBox has a signal clicked ( QAbstractButton * button ) so you need to define a slot void OnClick(QAbstractButton* b) and connect to it. Use QAbstractButton, not QPushButton.