timeline_widget.py 文件源码

def __init__(self, item, timeline_range, rect, *args, **kwargs):
        rect.setHeight(TRANSITION_HEIGHT)
        super(TransitionItem, self).__init__(
            item,
            timeline_range,
            rect,
            *args,
            **kwargs
        )
        self.setBrush(
            QtGui.QBrush(QtGui.QColor(237, 228, 148, 255))
        )
        self.setY(TRACK_HEIGHT - TRANSITION_HEIGHT)
        self.setZValue(2)

        # add extra bit of shading
        shading_poly_f = QtGui.QPolygonF()
        shading_poly_f.append(QtCore.QPointF(0, 0))
        shading_poly_f.append(QtCore.QPointF(rect.width(), 0))
        shading_poly_f.append(QtCore.QPointF(0, rect.height()))

        shading_poly = QtGui.QGraphicsPolygonItem(shading_poly_f, parent=self)
        shading_poly.setBrush(QtGui.QBrush(QtGui.QColor(0, 0, 0, 30)))

        try:
            shading_poly.setPen(QtCore.Qt.NoPen)
        except TypeError:
            shading_poly.setPen(QtCore.Qt.transparent)