Wt

int buttonCounter = 0;

class ContextButton : public Wt::WPushButton
{
public:
	ContextButton(int itemCounter = 20)
	{
		setMaximumSize(130, 30);
		setText(std::string("Button ") + std::to_string(++buttonCounter));
		setAttributeValue("oncontextmenu", "event.cancelBubble = true; event.returnValue = false; return false;");
		mouseWentUp().connect([this, itemCounter](const Wt::WMouseEvent& event) {
			if (event.button() == Wt::MouseButton::Right)
			{
				Wt::WPopupMenu popup;
				for (int i = 0; i < itemCounter; ++i)
				{
					popup.addItem(std::string("Item ") + std::to_string(i));
				}
				popup.exec(event);
			}
		});
	}
};


class Application : public Wt::WApplication
{
public:
	Application(const Wt::WEnvironment& env);
};

Application::Application(const Wt::WEnvironment& env)
	: Wt::WApplication(env)
{
	auto rootLayout = root()->setLayout(std::make_unique<Wt::WVBoxLayout>());
	for (int i = 0; i < 20; ++i)
	{
		rootLayout->addWidget(std::make_unique<ContextButton>());
	}
	rootLayout->addStretch(1);
}

int main(int argc, char **argv)
{
	return Wt::WRun(argc, argv, [](const Wt::WEnvironment& env) {
		return std::make_unique<Application>(env);
	});
}