#!/usr/bin/python

import sys

from PySide.QtCore import *
from PySide.QtGui import *

class CloseEventFilter(QObject):
    def eventFilter(self, target, event):
        print event.type(), target
        return False

if __name__ == '__main__':
    #Qt boilerplate
    app = QApplication(sys.argv)
    main_window = QMainWindow()
    main_layout = QHBoxLayout()
    mdi_area = QMdiArea(main_window)

    ev_filter = CloseEventFilter()

    qframe1 = QFrame()
    qframe2 = QFrame()

    qframe1.installEventFilter(ev_filter)
    qframe2.installEventFilter(ev_filter)

    qhbox1 = QHBoxLayout()
    qhbox2 = QHBoxLayout()

    qframe1.setLayout(qhbox1)
    sw1 = mdi_area.addSubWindow(qframe1, Qt.WA_DeleteOnClose)

    qframe2.setLayout(qhbox2)
    sw2 = mdi_area.addSubWindow(qframe2, Qt.WA_DeleteOnClose)

    #Make the MDI area the central widget
    main_window.setCentralWidget(QWidget())
    main_window.centralWidget().setLayout(main_layout)
    main_layout.addWidget(mdi_area)

    main_window.show()

    app.lastWindowClosed.connect(lambda: mdi_area.closeAllSubWindows())

    app.exec_()