#include <QApplication>
#include <QMainWindow>
#include <QWidgetAction>
#include <QMenuBar>
#include <QMenu>
#include <QMouseEvent>
#include <QListWidget>
#include <QGridLayout>

class EnterLeaveWidget : public QWidget
{
public:
	EnterLeaveWidget(QWidget* parent = nullptr) : QWidget(parent), m_enterEvents(0), m_leaveEvents(0), m_layout(this), m_list(this)
	{
		m_layout.setContentsMargins(0, 0, 0, 0);
		m_layout.addWidget(&m_list);

	}

	void enterEvent(QEvent * event) override
	{
		m_enterEvents++;
		m_list.addItem("Enter " + QString::number(m_enterEvents) + " Leaves: " + QString::number(m_leaveEvents));
		m_list.scrollToBottom();
	}

	void leaveEvent(QEvent * event) override
	{
		m_leaveEvents++;
		m_list.addItem("Enter " + QString::number(m_enterEvents) + " Leaves: " + QString::number(m_leaveEvents));
		m_list.scrollToBottom();
	}

protected:
	int m_enterEvents;
	int m_leaveEvents;
	QGridLayout m_layout;
	QListWidget m_list;
};

void addEnterLeaveWidgetAsAction(QMenu * menu)
{
	QWidgetAction *widgetAction = new QWidgetAction(menu);
	auto w = new EnterLeaveWidget();
	w->setFixedSize(150, 150);
	widgetAction->setDefaultWidget(w);

	menu->addAction(widgetAction);
}

int main(int argc, char * argv[])
{
	QApplication qapp(argc, argv);
	QMainWindow mainWindow;
	mainWindow.setFixedSize(300, 350);


	auto mainMenu = mainWindow.menuBar()->addMenu("MainMenu");
	addEnterLeaveWidgetAsAction(mainMenu);

	auto subMenu = mainMenu->addMenu("SubMenu");
	addEnterLeaveWidgetAsAction(subMenu);

	mainWindow.show();

	qapp.exec();
}