def show_child_window(self, widget_number):
        if widget_number == 0:
            self.deliver_widget = DeliverWindow()
            self.deliver_widget = self.ui.mdiArea.addSubWindow(self.deliver_widget)
            self.deliver_widget.showMaximized()
        elif widget_number == 1:
            self.sale_widget = SaleWindow()
            self.ui.mdiArea.addSubWindow(self.sale_widget)
            self.sale_widget.showMaximized()

        elif widget_number == 2:
            self.drugs_widget = AllDrugsWindow()
            self.ui.mdiArea.addSubWindow(self.drugs_widget)
            self.drugs_widget.showMaximized()

        elif widget_number == 3:
            self.delivers_widget = AllDeliversWindow(self.ui.mdiArea)
            self.ui.mdiArea.addSubWindow(self.delivers_widget)
            self.delivers_widget.showMaximized()
        elif widget_number == 4:
            self.sales_widget = AllSalesWindow(self.ui.mdiArea)
            self.ui.mdiArea.addSubWindow(self.sales_widget)
            self.sales_widget.showMaximized()
        elif widget_number == 5:
            self.patients_widget = AllPatientsWindow()
            self.ui.mdiArea.addSubWindow(self.patients_widget)
            self.patients_widget.showMaximized()
        elif widget_number == 6:
            self.distributors_widget = AllDistributorsWindow()
            self.ui.mdiArea.addSubWindow(self.distributors_widget)
            self.distributors_widget.showMaximized()
        elif widget_number == 7:
            self.medorg_widget = AllMedorgWindow()
            self.ui.mdiArea.addSubWindow(self.medorg_widget)
            self.medorg_widget.showMaximized()
        elif widget_number == 8:
            self.doctors_widget = AllDoctorsWindow()
            self.doctors_widget = self.ui.mdiArea.addSubWindow(self.doctors_widget)
            self.doctors_widget.showMaximized()
        elif widget_number == 9:
            self.manufacters_widget = AllManufactersWindow()
            self.manufacters_widget = self.ui.mdiArea.addSubWindow(self.manufacters_widget)
            self.manufacters_widget.showMaximized()
            # QObject.connect(self.manufacters_widget, SIGNAL("closed()"), self.ui.mdiArea.removeSubWindow)

        elif widget_number == 10:
            self.ills_widget = AllIllsWindow()
            self.ills_widget = self.ui.mdiArea.addSubWindow(self.ills_widget)
            self.ills_widget.showMaximized()
        elif widget_number == 11:
            self.recipes_widget = AllRecipesWindow()
            self.recipes_widget = self.ui.mdiArea.addSubWindow(self.recipes_widget)
            self.recipes_widget.showMaximized()
class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.mdiArea.setOption(QMdiArea.DontMaximizeSubWindowOnActivation, True)

    @pyqtSlot(int)
    def show_child_window(self, widget_number):
        if widget_number == 0:
            self.deliver_widget = DeliverWindow()
            self.deliver_widget = self.ui.mdiArea.addSubWindow(self.deliver_widget)
            self.deliver_widget.showMaximized()
        elif widget_number == 1:
            self.sale_widget = SaleWindow()
            self.ui.mdiArea.addSubWindow(self.sale_widget)
            self.sale_widget.showMaximized()

        elif widget_number == 2:
            self.drugs_widget = AllDrugsWindow()
            self.ui.mdiArea.addSubWindow(self.drugs_widget)
            self.drugs_widget.showMaximized()

        elif widget_number == 3:
            self.delivers_widget = AllDeliversWindow(self.ui.mdiArea)
            self.ui.mdiArea.addSubWindow(self.delivers_widget)
            self.delivers_widget.showMaximized()
        elif widget_number == 4:
            self.sales_widget = AllSalesWindow(self.ui.mdiArea)
            self.ui.mdiArea.addSubWindow(self.sales_widget)
            self.sales_widget.showMaximized()
        elif widget_number == 5:
            self.patients_widget = AllPatientsWindow()
            self.ui.mdiArea.addSubWindow(self.patients_widget)
            self.patients_widget.showMaximized()
        elif widget_number == 6:
            self.distributors_widget = AllDistributorsWindow()
            self.ui.mdiArea.addSubWindow(self.distributors_widget)
            self.distributors_widget.showMaximized()
        elif widget_number == 7:
            self.medorg_widget = AllMedorgWindow()
            self.ui.mdiArea.addSubWindow(self.medorg_widget)
            self.medorg_widget.showMaximized()
        elif widget_number == 8:
            self.doctors_widget = AllDoctorsWindow()
            self.doctors_widget = self.ui.mdiArea.addSubWindow(self.doctors_widget)
            self.doctors_widget.showMaximized()
        elif widget_number == 9:
            self.manufacters_widget = AllManufactersWindow()
            self.manufacters_widget = self.ui.mdiArea.addSubWindow(self.manufacters_widget)
            self.manufacters_widget.showMaximized()
            # QObject.connect(self.manufacters_widget, SIGNAL("closed()"), self.ui.mdiArea.removeSubWindow)

        elif widget_number == 10:
            self.ills_widget = AllIllsWindow()
            self.ills_widget = self.ui.mdiArea.addSubWindow(self.ills_widget)
            self.ills_widget.showMaximized()
        elif widget_number == 11:
            self.recipes_widget = AllRecipesWindow()
            self.recipes_widget = self.ui.mdiArea.addSubWindow(self.recipes_widget)
            self.recipes_widget.showMaximized()