How to capture the click on the question mark '?' button in dialog

[Sprezzatura]

I have a dialog that has the question mark '?' button in the title bar. When the user clicks on the button, I want to launch a Help topic.

This button seems to be associated with the QWhatsThis thing. But this is about more than displaying a tooltip. When the user clicks on the '?', I need the code to call my function so I can display the Help topic.

Does anyone have a code sample they can share, or a suggestion for how to do this?

[SGaist]

Hi,

I haven't used that yet but from the documentation of QWhatsThis you can set the Qt::WA_CustomWhatsThis attribute to keep the widget in normal mode.

I don't know if this will work but then you could connect the triggered signal of the action created by QWhatsThis::createAction to show your help.

Hope it helps

[Sprezzatura]

@SGaist I had a sense that those are the functions I would use, but I needed an example that tied it all together. I was provided with this:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    // Ensure the Help button is displayed
    setWindowFlags(Qt::WindowCloseButtonHint | Qt::WindowContextHelpButtonHint);

    // Set up the event filter
    qApp->installEventFilter(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

/// Filter the events
bool MainWindow::eventFilter(QObject *object, QEvent *event) {
    if (event->type() == QEvent::EnterWhatsThisMode) {
        _handleWhatsThisEntry(QApplication::activeWindow());
        return true;
    }
    return QObject::eventFilter(object, event);
}

/// Handle the EnterWhatsThisMode event
void MainWindow::_handleWhatsThisEntry(QWidget * /*sender*/) {
    qDebug() << "What's This Mode Entered";

    // Launch help file using default system viewer
    //QDesktopServices::openUrl(QUrl("file:///C:/path/to/help/file.chm", QUrl::TolerantMode));
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

protected:
    /// Filter events
    virtual bool eventFilter(QObject *object, QEvent *event);

private:
    Ui::MainWindow *ui;

    /// Handle the EnterWhatsThisMode event
    void _handleWhatsThisEntry(QWidget * /*sender*/);
};

Works for dialogs too.

Thanks for your help.