def mouseMoveEvent(self, event):
     """Override Qt method"""
     if event.buttons() == Qt.MouseButtons(Qt.LeftButton) and \
        (event.pos() - self.__drag_start_pos).manhattanLength() > \
             QApplication.startDragDistance():
         drag = QDrag(self)
         mimeData = QMimeData()
         # Converting id's to long to avoid an OverflowError with PySide
         if PY2:
             ancestor_id = long(id(self.ancestor))
             parent_widget_id = long(id(self.parentWidget()))
             self_id = long(id(self))
         else:
             ancestor_id = id(self.ancestor)
             parent_widget_id = id(self.parentWidget())
             self_id = id(self)
         mimeData.setData("parent-id", QByteArray.number(ancestor_id))
         mimeData.setData("tabwidget-id",
                          QByteArray.number(parent_widget_id))
         mimeData.setData("tabbar-id", QByteArray.number(self_id))
         mimeData.setData("source-index", 
                      QByteArray.number(self.tabAt(self.__drag_start_pos)))
         drag.setMimeData(mimeData)
         drag.exec_()
     QTabBar.mouseMoveEvent(self, event)

 def __init__(self, parent, ancestor):
     QTabBar.__init__(self, parent)
     self.ancestor = ancestor
         
     # Dragging tabs
     self.__drag_start_pos = QPoint()
     self.setAcceptDrops(True)

 def dragEnterEvent(self, event):
     """Override Qt method"""
     mimeData = event.mimeData()
     formats = list(mimeData.formats())
     if "parent-id" in formats and mimeData.data("parent-id").toLong()[0] == id(self.ancestor):
         event.acceptProposedAction()
     QTabBar.dragEnterEvent(self, event)

    def __init__(self, parent, ancestor):
        QTabBar.__init__(self, parent)
        self.ancestor = ancestor

        # To style tabs on Mac
        if sys.platform == 'darwin':
            self.setObjectName('plugin-tab')
            
        # Dragging tabs
        self.__drag_start_pos = QPoint()
        self.setAcceptDrops(True)

 def dropEvent(self, event):
     """Override Qt method"""
     mimeData = event.mimeData()
     index_from = mimeData.data("source-index").toInt()[0]
     index_to = self.tabAt(event.pos())
     if index_to == -1:
         index_to = self.count()
     if mimeData.data("tabbar-id").toLong()[0] != id(self):
         tabwidget_from = mimeData.data("tabwidget-id").toLong()[0]
         self.emit(SIGNAL("move_tab(long,int,int)"), 
                   tabwidget_from, index_from, index_to)
         event.acceptProposedAction()
     elif index_from != index_to:
         self.emit(SIGNAL("move_tab(int,int)"), index_from, index_to)
         event.acceptProposedAction()
     QTabBar.dropEvent(self, event)

 def mouseMoveEvent(self, event):
     """Override Qt method"""
     if event.buttons() == Qt.MouseButtons(Qt.LeftButton) and \
        (event.pos() - self.__drag_start_pos).manhattanLength() > \
             QApplication.startDragDistance():
         drag = QDrag(self)
         mimeData = QMimeData()
         mimeData.setData("parent-id", QByteArray.number(id(self.ancestor)))
         mimeData.setData("tabwidget-id",
                          QByteArray.number(id(self.parentWidget())))
         mimeData.setData("tabbar-id", QByteArray.number(id(self)))
         mimeData.setData("source-index", 
                      QByteArray.number(self.tabAt(self.__drag_start_pos)))
         drag.setMimeData(mimeData)
         drag.exec_()
     QTabBar.mouseMoveEvent(self, event)

    def dropEvent(self, event):
        """Override Qt method"""
        mimeData = event.mimeData()
        index_from = mimeData.data("source-index").toInt()[0]
        index_to = self.tabAt(event.pos())
        if index_to == -1:
            index_to = self.count()
        if mimeData.data("tabbar-id").toLong()[0] != id(self):
            tabwidget_from = str(mimeData.data("tabwidget-id").toLong()[0])

            # We pass self object ID as a QString, because otherwise it would
            # depend on the platform: long for 64bit, int for 32bit. Replacing
            # by long all the time is not working on some 32bit platforms
            # (see Issue 1094, Issue 1098)
            self.sig_move_tab[(str, int, int)].emit(tabwidget_from, index_from, index_to)

            event.acceptProposedAction()
        elif index_from != index_to:
            self.sig_move_tab.emit(index_from, index_to)
            event.acceptProposedAction()
        QTabBar.dropEvent(self, event)

 def mousePressEvent(self, event):
     """Reimplement Qt method"""
     if event.button() == Qt.LeftButton:
         self.__drag_start_pos = QPoint(event.pos())
     QTabBar.mousePressEvent(self, event)