How to use the uwsift.view.timeline.items.QFrameItem function in uwsift

def _create_frame(self, qti: QTrackItem, frm: FrameInfo) -> QFrameItem:
        qfi = QFrameItem(qti, self.coords, frm.uuid, frm.when.s, frm.when.d, _translate_to_visual_state(frm.state),
                         frm.primary, frm.secondary)
        return qfi

def _test_populate(self):
        from uuid import uuid1 as uuidgen
        once = datetime.utcnow()

        def minutes_td(minutes):
            return timedelta(minutes=minutes)
        # assert(hasattr(self, '_track_order'))
        self._span = Span(once - minutes_td(10), minutes_td(30))
        track0 = QTrackItem(self, self.coords, 'IMAGE:test::timeline:GOES-21:QBI:mars', 1,
                            "G21 QBI B99 BT", "test track", tooltip="peremptorily cromulent")
        # scene.addItem(abitrack)  # done in init
        frame01 = QFrameItem(track0, self.coords, uuidgen(), once + minutes_td(5), minutes_td(5),
                             Flags([VisualState.BUSY]), "abi1", "fulldiskimus")
        track1 = QTrackItem(self, self.coords, 'IMAGE:test::timeline:Himawari-11:AHI:mars', 0,
                            "H11 AHI B99 Rad", "second test track", tooltip="nominally cromulent")
        frame11 = QFrameItem(track1, self.coords, uuidgen(), once + minutes_td(6), minutes_td(1),
                             Flags([VisualState.READY]), "ahi1", "JP04")
        # self.insert_track(track0)
        # self.insert_track(track1)
        # assert(hasattr(self, '_propagate_max_z'))
        self.propagate_max_z()
        for track in [track0, track1]:
            track.update_pos_bounds()
            track.update_frame_positions()
        # scene.addItem(frame1)  # done in init
        # blabla = QGraphicsTextItem('abcdcba')
        # font = QFont('White Rabbit')
        # blabla.setFont(font)

# coordinate transform between track Z order and time to scene float x,y,w,h
    _coords: CoordTransform = None

    # rulers at top and/or bottom of scene; QGraphicsItems have to be retained in python to avoid confusing Qt
    _top_ruler_item: QTimeRulerItem = None
    _bottom_ruler_item: QTimeRulerItem = None
    _ruler_tick_interval: timedelta = None

    # cursor information
    _cursor_time: datetime = None
    _cursor_duration: timedelta = None

    # content representing document / workspace / scenegraph
    _track_items: Mapping[str, QTrackItem] = None  # retain QTrackItem objects lest they disappear; also bookkeeping
    _frame_items: Mapping[UUID, QFrameItem] = None  # likewise for QFrameItems
    _decor_items: Mapping[Any, QGraphicsItem] = None  # decoration items

    # styling settings
    _track_pen_brush = None, None
    _frame_pen_brush = None, None

    # _frame_states_allowed = None  # allow filtering of frames and tracks for thinned views

    def __init__(self):
        super(QFramesInTracksScene, self).__init__()
        self._coords = CoordTransform()
        self._track_items = {}
        self._frame_items = {}
        pen = QPen()
        pen.setWidthF(1.25)
        pen.setColor(Qt.black)

def _test_populate(self):
        from uuid import uuid1 as uuidgen
        once = datetime.utcnow()

        def minutes_td(minutes):
            return timedelta(minutes=minutes)
        # assert(hasattr(self, '_track_order'))
        self._span = Span(once - minutes_td(10), minutes_td(30))
        track0 = QTrackItem(self, self.coords, 'IMAGE:test::timeline:GOES-21:QBI:mars', 1,
                            "G21 QBI B99 BT", "test track", tooltip="peremptorily cromulent")
        # scene.addItem(abitrack)  # done in init
        frame01 = QFrameItem(track0, self.coords, uuidgen(), once + minutes_td(5), minutes_td(5),
                             Flags([VisualState.BUSY]), "abi1", "fulldiskimus")
        track1 = QTrackItem(self, self.coords, 'IMAGE:test::timeline:Himawari-11:AHI:mars', 0,
                            "H11 AHI B99 Rad", "second test track", tooltip="nominally cromulent")
        frame11 = QFrameItem(track1, self.coords, uuidgen(), once + minutes_td(6), minutes_td(1),
                             Flags([VisualState.READY]), "ahi1", "JP04")
        # self.insert_track(track0)
        # self.insert_track(track1)
        # assert(hasattr(self, '_propagate_max_z'))
        self.propagate_max_z()
        for track in [track0, track1]:
            track.update_pos_bounds()
            track.update_frame_positions()
        # scene.addItem(frame1)  # done in init
        # blabla = QGraphicsTextItem('abcdcba')
        # font = QFont('White Rabbit')
        # blabla.setFont(font)
        # blabla.setPos(140, 100)
        # self.addItem(blabla)
        # blabla = None
        self.content = [track0, frame01, track1, frame11]