Method _handler_js2py_pointsCallback

plotly/basewidget.py:635–717

Process points callback message from the frontend

(self, change)

    @observe("_js2py_pointsCallback")
    def _handler_js2py_pointsCallback(self, change):
        """
        Process points callback message from the frontend
        """

        # Receive message
        # ---------------
        callback_data = change["new"]

        if not callback_data:
            self._js2py_pointsCallback = None
            return

        # Get event type
        # --------------
        event_type = callback_data["event_type"]

        # Build Selector Object
        # ---------------------
        if callback_data.get("selector", None):
            selector_data = callback_data["selector"]
            selector_type = selector_data["type"]
            selector_state = selector_data["selector_state"]
            if selector_type == "box":
                selector = BoxSelector(**selector_state)
            elif selector_type == "lasso":
                selector = LassoSelector(**selector_state)
            else:
                raise ValueError("Unsupported selector type: %s" % selector_type)
        else:
            selector = None

        # Build Input Device State Object
        # -------------------------------
        if callback_data.get("device_state", None):
            device_state_data = callback_data["device_state"]
            state = InputDeviceState(**device_state_data)
        else:
            state = None

        # Build Trace Points Dictionary
        # -----------------------------
        points_data = callback_data["points"]
        trace_points = {
            trace_ind: {
                "point_inds": [],
                "xs": [],
                "ys": [],
                "trace_name": self._data_objs[trace_ind].name,
                "trace_index": trace_ind,
            }
            for trace_ind in range(len(self._data_objs))
        }

        for x, y, point_ind, trace_ind in zip(
            points_data["xs"],
            points_data["ys"],
            points_data["point_indexes"],