drop down > ?

Duy Khang

how can i auto drop down comboBox when mouse hover into it ?

mrjj

Hi
well you can subclass it and overwrite the enter event and then call
https://doc.qt.io/qt-5/qcombobox.html#showPopup
or use an event filer to look for enter and do the same.

sorry its
void QWidget::enterEvent(QEvent *event)
void QWidget::leaveEvent(QEvent *event)

SGaist

Hi,

You can use showPopup to force the drop down to show.

Duy Khang

@mrjj just mouse hover not enterEvent

SGaist

You can use the QMouseHoverEvent.

See the class details on how to enable it.

mrjj

@Duy-Khang
Yes You are right. enterEvent is a bit too aggressive :)
alt text

Update:
HoverEvent is less fast. but not as much as i expected.

class combo : public QComboBox
{
public:
    explicit  combo(QWidget *parent ) : QComboBox(parent)
    {
        setAttribute(Qt::WA_Hover);
    }

protected:

    virtual bool event(QEvent *event) override
    {
        switch (event->type()) {
        case QEvent::HoverEnter:
            if ( ! view()->isVisible() ) {
                showPopup();
            }
            return true;
            break;
        case QEvent::HoverLeave:
            return true;
            break;
        case QEvent::HoverMove:
            return true;
            break;
        default:
            break;
        }
        return QComboBox::event(event);
    }
};