How to add scrollable regions with Drag & drop widgets with PyQt?

Question

Please add a scrollable region to this code so that when I run the code, I can scroll down through the window and see the last items in the window and replace them.

As this is a drag and drop code I could not add scroll to it.

Moreover, during the drag and drop process, the scroll should work and does not interrupt the drag and drop process.

from PyQt5.QtWidgets import QApplication, QScrollArea, QHBoxLayout, QWidget, QLabel, QMainWindow, QVBoxLayout
from PyQt5.QtCore import Qt, QMimeData, pyqtSignal
from PyQt5.QtGui import QDrag, QPixmap


class DragItem(QLabel):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.setContentsMargins(25, 5, 25, 5)
        self.setAlignment(Qt.AlignmentFlag.AlignCenter)
        self.setStyleSheet("border: 1px solid black;")
        # Store data separately from display label, but use label for default.
        self.data = self.text()

    def set_data(self, data):
        self.data = data

    def mouseMoveEvent(self, e):

        if e.buttons() == Qt.LeftButton:
            drag = QDrag(self)
            mime = QMimeData()
            drag.setMimeData(mime)

            pixmap = QPixmap(self.size())
            self.render(pixmap)
            drag.setPixmap(pixmap)

            drag.exec_(Qt.MoveAction)


class DragWidget(QWidget):
    """
    Generic list sorting handler.
    """

    orderChanged = pyqtSignal(list)

    def __init__(self, *args, orientation=Qt.Orientation.Horizontal, **kwargs):
        super().__init__()
        self.setAcceptDrops(True)

        # Store the orientation for drag checks later.
        self.orientation = orientation

        if self.orientation == Qt.Orientation.Vertical:
            self.blayout = QVBoxLayout()
        else:
            self.blayout = QHBoxLayout()

        self.setLayout(self.blayout)

    def dragEnterEvent(self, e):
        e.accept()

    def dropEvent(self, e):
        pos = e.pos()
        widget = e.source()

        for n in range(self.blayout.count()):
            # Get the widget at each index in turn.
            w = self.blayout.itemAt(n).widget()
            if self.orientation == Qt.Orientation.Vertical:
                # Drag drop vertically.
                drop_here = pos.y() < w.y() + w.size().height() // 2
            else:
                # Drag drop horizontally.
                drop_here = pos.x() < w.x() + w.size().width() // 2

            if drop_here:
                # We didn't drag past this widget.
                # insert to the left of it.
                self.blayout.insertWidget(n-1, widget)
                self.orderChanged.emit(self.get_item_data())
                break

        e.accept()

    def add_item(self, item):
        self.blayout.addWidget(item)

    def get_item_data(self):
        data = []
        for n in range(self.blayout.count()):
            # Get the widget at each index in turn.
            w = self.blayout.itemAt(n).widget()
            data.append(w.data)
        return data


class MainWindow(QMainWindow):

    def __init__(self):
        super().__init__()
        self.drag = DragWidget(orientation=Qt.Orientation.Vertical)
        self.scroll = QScrollArea()  ###########
        self.blayout = QHBoxLayout()
        self.widget = QWidget()
        for n, l in enumerate(['Art', 'Boo', 'EOA', 'Hel', \
'Hyg', 'Lei', 'Lei','Lei','Lei','Lei','Lei','Lei','Lei','Lei','Lei','Lei','Lei', 'Med',\
'Nut','Nut','Nut','Rel','Rel','Rel','Sle','SLN','Spo','Spo','Spo','Spo','Spo','Thi','Thi',\
'Wor','Wor','Wor','Wor','Wor','Wor','Wor','Wor','Wor','Wor','Wor','Wor','Wor','Wor']):
            item = DragItem(l)
            item.set_data(n)  # Store the data.
            self.drag.add_item(item)
        
        def myFun():
            print('hi', self.drag.get_item_data())

            
        # Print out the changed order.
#         self.drag.orderChanged.connect(print)
        # add by me
        self.drag.orderChanged.connect(myFun)
        
        #Scroll Area Properties
        self.scroll.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
        self.scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.scroll.setWidgetResizable(True)
        self.scroll.setWidget(self.widget)
        
        
        

        container = QWidget()
        layout = QVBoxLayout()
        layout.addStretch(1)
        layout.addWidget(self.drag)
        layout.addStretch(1)
        container.setLayout(layout)

        self.setCentralWidget(container)
#         self.setCentralWidget(self.scroll)


app = QApplication([])
w = MainWindow()
w.show()

app.exec_()