"""
Edge representation for Qt: Same as a LineItem, but stores items it is connected to
"""

from PyQt5.QtWidgets import QGraphicsItem, QGraphicsLineItem


class GraphicsEdgeItem(QGraphicsLineItem):
    def __init__(self, from_item, to_item, edge_id=None):
        QGraphicsLineItem.__init__(self)
        self.from_item = from_item
        self.to_item = to_item
        self.edge_id = edge_id
        self.setFlag(QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QGraphicsItem.ItemIsSelectable, False)

    def redraw(self):
        from_pos = self.from_item.scenePos()
        to_pos = self.to_item.scenePos()
        self.setLine(from_pos.x(), from_pos.y(), to_pos.x(), to_pos.y())

    # hack to work around failing isinstance check due to import chaos
    def __hack__(self):
        return None