#include <QAction>
#include <QApplication>
#include <QFrame>
#include <QMenu>
#include <QtDebug>
#include <QTextEdit>
#include <QVBoxLayout>
#include <QWidget>
#include <QWindow>

class Popup : public QFrame
{
public:
    Popup()
        //: QFrame(nullptr) // OKE
        : QFrame(nullptr, Qt::Popup) // NOT OKE
        
    {
        Setup();
    }

    void SetInitialText(const QString& t)
    {
        txt->setText(t);
    }

private:
    void ShowContextMenu(const QPoint& pt)
    {
        auto menu = txt->createStandardContextMenu();
        auto custom = menu->addAction("Formatted copy");
        connect(custom, &QAction::triggered, this, &Popup::CustomActionTriggered);
        menu->exec(this->mapToGlobal(pt));
        delete menu;
    }

    void CustomActionTriggered(bool)
    {
        qInfo() << "Custom action triggered";
    }

    void Setup()
    {
        layout = new QVBoxLayout(this);
        txt = new QTextEdit(this);
        txt->setContextMenuPolicy(Qt::CustomContextMenu);
        txt->setReadOnly(true);
        connect(txt, &QTextEdit::customContextMenuRequested,
            this, &Popup::ShowContextMenu);
        layout->addWidget(txt);
    }

    QVBoxLayout* layout;
    QTextEdit* txt;
};

void CreatePopup()
{
    auto popup = new Popup();
    popup->setAttribute(Qt::WA_DeleteOnClose);
    popup->SetInitialText("Some text to display");
    popup->show();
}

int main(int argc, char** argv)
{
    QApplication app(argc, argv);

    QWidget window;
    QAction* showDialog = new QAction("Show dialog", &window);
    QObject::connect(showDialog, &QAction::triggered, []{ CreatePopup(); });
    window.addAction(showDialog);
    window.setContextMenuPolicy(Qt::ActionsContextMenu);

    window.show();

    return app.exec();
}