Handling touch events for parent and child widgets

[lich.mk]

Hello!

There are two widgets - parent (main window) and child (pop-up menu):

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
 
class Window(QWidget):
    def __init__(self): 
        QWidget.__init__(self)
        self.menu = Menu(parent=self)
        self.menu.hide()
        ...
 
class Menu(QWidget):
    def __init__(self, parent): 
        QWidget.__init__(self, parent)
        ...

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class Window(QWidget):
    def __init__(self): 
        QWidget.__init__(self)
        self.menu = Menu(parent=self)
        self.menu.hide()
        ...
         
class Menu(QWidget):
    def __init__(self, parent): 
        QWidget.__init__(self, parent)
        ...

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By default, menu is hidden. The menu should be shown when touch on the main window area. This task is easily solved with QEvent.TouchBegin:

def eventFilter(self, obj, event): 
    if event.type() == QEvent.TouchBegin: self.menu.show()

def eventFilter(self, obj, event): 
    if event.type() == QEvent.TouchBegin: self.menu.show()

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The menu should become hidden when touch on any area of the main window that doesn't have a menu above it (a touch outside the menu).

Is there an easy way to detect this event (without using touch coordinates)?