LazyFillComboBox.h

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#ifndef LAZY_FILL_COMBO_BOX_HPP__
#define LAZY_FILL_COMBO_BOX_HPP__
 
#include <QComboBox>
 
class QWidget;
 

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} {}

    void showPopup() override {
        Q_EMIT about_to_show_popup();
        QComboBox::showPopup();
    }

    void hidePopup() override {
        QComboBox::hidePopup();
        Q_EMIT popup_hidden();
    }
};
 
#endif