def _onHandleMoved(self, delta):
        """ Handle the 'handleMoved' signal on the item handle.

        This handler resizes the item by the delta and then updates
        the internal user size. The resize is bounded by the limits
        of the widget and the parent dock area size.

        Resizing is disabled if an animation is running.

        """
        animation = self._animation
        if animation and animation.state() == animation.Running:
            return
        p = self.position()
        if p == QDockBar.North:
            delta = QSize(0, delta.y())
        elif p == QDockBar.East:
            delta = QSize(-delta.x(), 0)
        elif p == QDockBar.South:
            delta = QSize(0, -delta.y())
        else:
            delta = QSize(delta.x(), 0)
        user_size = self.size() + delta
        user_size = user_size.expandedTo(self.minimumSize())
        parent = self.parent()
        if parent is not None:
            user_size = user_size.boundedTo(parent.size())
        self._user_size = user_size
        if p == QDockBar.East or p == QDockBar.South:
            d = user_size - self.size()
            p = self.pos() - QPoint(d.width(), d.height())
            self.setGeometry(QRect(p, user_size))
        else:
            self.resize(user_size)
dataset/ETHPy150Open nucleic/enaml/enaml/qt/docking/q_dock_bar.py/QDockBarItem._onHandleMoved/original