Click on drop-down list of QComboBox

Maluna34

Hello ! :)

I currently have a QComboBox in a QGraphicsScene and I need it to detect clicks. To see if there is a widget in the clicked position, I use :

void BlockScene::mousePressEvent(QMouseEvent *event)
{
    if (itemAt(event->pos()) != m_widgetItem)
    {
        // ...
    }
}

This works well for different widgets except for combo boxes where it only takes into account the original widget and not the drop-down list that appears after a first click.

To know if it came from the scene or not, I tested also by redefining mousePressEvent of the class QComboBox and same problem: it is called only when clicking on the initial widget. :(

Is there a way to get the drop-down list ? To detect a click on it ? Ideas ?

Thanks ! ;)

raven-worx

@Maluna34
install an event-filter on the combo box's view and inspect the mouse events.

Maluna34

@raven-worx
Do you mean comboBox->view()->installEventFilter(this); or comboBox->installEventFilter(this); ?

It does not work. :(

raven-worx

@Maluna34 said in Click on drop-down list of QComboBox:

It does not work. :(

my glassball is broken, please help me out here.

Just to make sure: do you know how event-filters work? I guess you didn't overload eventFilter() no?

Maluna34

@raven-worx
I did don't worry ! ;) It's just that I'm at work. ^^

So I tried this :

    virtual bool eventFilter(QObject *watched, QEvent *event) override
    {
        if (watched == m_box)
        {
            if (event->type() == QEvent::MouseButtonPress)
            {
                qDebug() << "event";

                return QMainWindow::eventFilter(watched, event);
            }
        }
        else
            return QMainWindow::eventFilter(watched, event);
    }

With m_box->installEventFilter(this); this is the same as with mousePressEvent, the message only appears when the initial widget is clicked.
And with m_box->view()->installEventFilter(this); nothing is happening.

raven-worx

@Maluna34
install it on the view: comboBox->view()->installEventFilter(this);
Then you of course in the eventFilter() implementation you also need to check for the view:

virtual bool eventFilter(QObject *watched, QEvent *event) override
    {
        if (watched == m_box->view())
        {
            if (event->type() == QEvent::MouseButtonPress)
            {
                qDebug() << "event";
            }
        }

        return QMainWindow::eventFilter(watched, event);
    }

Maluna34

@raven-worx
Thanks, I have events on the m_box->view() widget but no click. Here are the kind of events I have on the view :

QEvent::Type(Show)
QEvent::Type(FocusIn)
QEvent::Type(UpdateLater)
QEvent::Type(Enter)
QEvent::Type(FocusAboutToChange)
QEvent::Type(InputMethodQuery)
QEvent::Type(ToolTip)
QEvent::Type(Leave)
QEvent::Type(Enter)
QEvent::Type(FocusAboutToChange)
QEvent::Type(FocusOut)
QEvent::Type(InputMethodQuery)
QEvent::Type(Hide)
QEvent::Type(Leave)
QEvent::Type(Timer)

raven-worx

@Maluna34
and when you do the same on view()->viewport()?

Maluna34

@raven-worx
It works !!! Thank you !!!

Now I just have to see if I can check it into the scene (maybe create a widgetitem for the viewport, I'll see.