port.py 文件源码

def __init__(self, port, graph, hOffset, color, connectionPointType):
        super(PortCircle, self).__init__(port)

        self.__port = port
        self._graph = graph
        self._connectionPointType = connectionPointType
        self.__connections = set()
        self._supportsOnlySingleConnections = connectionPointType == 'In'

        self.setSizePolicy(QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed))
        size = QtCore.QSizeF(self.__diameter, self.__diameter)
        self.setPreferredSize(size)
        self.setWindowFrameMargins(0, 0, 0, 0)

        self.transform().translate(self.__radius * hOffset, 0)

        self.__defaultPen = QtGui.QPen(QtGui.QColor("#000000"), 1.0)
        self.__hoverPen = QtGui.QPen(QtGui.QColor("#000000"), 1.5)

        self._ellipseItem = QtWidgets.QGraphicsEllipseItem(self)
        self._ellipseItem.setPen(self.__defaultPen)
        self._ellipseItem.setPos(size.width()/2, size.height()/2)
        self._ellipseItem.setRect(
            -self.__radius,
            -self.__radius,
            self.__diameter,
            self.__diameter,
            )

        self.setColor(color)
        self.setAcceptHoverEvents(True)