Which Signal is related to click or open QComboBox?
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I need to when user click or open QComboBox "slot self.materialsInstance.addToComboBox_Insert" will be emitted.But i don't know related Signal...!
Notes: My QComboBox is empty.
My question is, What's related signal for open or click on QComboBox?
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If your combox is empty no signal will be emitted.
But you can "installEventFilter":http://qt-project.org/doc/qt-5.0/qtcore/qobject.html#installEventFilter for your combobox and reimplement "eventfilter":http://qt-project.org/doc/qt-4.8/eventsandfilters.html#event-filters and intercept the event you desire viz. MousePress or MouseRelease in your case and do there whatever is needed. -
class KeyPressEater : public QObject
{
Q_OBJECT
...protected:
bool eventFilter(QObject *obj, QEvent *event);
};bool KeyPressEater::eventFilter(QObject *obj, QEvent *event)
{
if (event->type() == QEvent::KeyPress) {
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
qDebug("Ate key press %d", keyEvent->key());
return true;
} else {
// standard event processing
return QObject::eventFilter(obj, event);
}
}KeyPressEater *keyPressEater = new KeyPressEater(this);
QPushButton *pushButton = new QPushButton(this);
QListView *listView = new QListView(this);pushButton->installEventFilter(keyPressEater);
listView->installEventFilter(keyPressEater); -
A bit late but for everyone who finds this post in a quest to get this question answered:
An alternative is to overload the showPopup method:#include <QComboBox>
class CPortsComboBox : public QComboBox
{
Q_OBJECT
public:
explicit CPortsComboBox(QWidget *parent = 0);
virtual ~CPortsComboBox();public:
virtual void showPopup()
{
while (count() > 0) { removeItem(0); }
addItem("hello");
addItem("World"):
QComboBox::showPopup();
}
};
