#include <QApplication>
#include <QMainWindow>
#include <QWidget>
#include <QDebug>


class MouseArea : public QWidget
{
public:
    MouseArea(const QString &name, QWidget *parent)
        : QWidget(parent)
        , m_name(name)
    {}

   void mouseDoubleClickEvent(QMouseEvent *) override {
       qDebug() << m_name << " : double click";
   }

   void mousePressEvent(QMouseEvent *) override {
       qDebug() << m_name << " : press";
       // hide this item
       this->resize(0, 0);
   }

   void mouseReleaseEvent(QMouseEvent *) override {
       qDebug() << m_name << " : release";
   }

private:
   QString m_name;
};


class MainWindow : public QMainWindow
{
public:
    MainWindow(QWidget *parent = nullptr)
        : QMainWindow(parent)
        , m_bottom_area("bottom", this)
        , m_top_area("top", this)
    {
        m_bottom_area.resize( this->size() );
        m_top_area.resize( this->size() );
    }

private:
    MouseArea m_bottom_area;
    MouseArea m_top_area;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}