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#ifndef LAZY_FILL_COMBO_BOX_HPP__
#define LAZY_FILL_COMBO_BOX_HPP__
#include <QComboBox>
class QWidget;
//
// Class LazyFillComboBox
//
// QComboBox derivative that signals show and hide of the pop up list.
//
class LazyFillComboBox
: public QComboBox
{
Q_OBJECT
public:
Q_SIGNAL void about_to_show_popup ();
Q_SIGNAL void popup_hidden ();
explicit LazyFillComboBox (QWidget * parent = nullptr)
: QComboBox {parent}
{
}
#if QT_VERSION >= QT_VERSION_CHECK (5, 12, 0)
void showPopup () override
{
Q_EMIT about_to_show_popup ();
QComboBox::showPopup ();
}
void hidePopup () override
{
QComboBox::hidePopup ();
Q_EMIT popup_hidden ();
}
#else
void mousePressEvent (QMouseEvent * e) override
{
Q_EMIT about_to_show_popup ();
QComboBox::mousePressEvent (e);
}
void mouseReleaseEvent (QMouseEvent * e) override
{
QComboBox::mouseReleaseEvent (e);
Q_EMIT popup_hidden ();
}
#endif
};
#endif
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