import param
import holoviews as hv
import panel as pn

pn.extension()

class TapTest(pn.custom.PyComponent):

    x = param.Number(default=1, allow_refs=True)
    y = param.Number(default=0.5, allow_refs=True)

    def __init__(self, **params):
        super().__init__(**params)

        self._tap = hv.streams.Tap.from_param(x=self.param.x, y=self.param.y)
        hv_pane = pn.pane.HoloViews(object=hv.DynamicMap(self.plot, streams=[self._tap]))
        self._layout = pn.Column(hv_pane, self.param.x, self.param.y)

    def plot(self, x, y):
        return hv.Points([(x, y)]).opts(tools=['tap'], xlim=(0, 2), ylim=(0, 2))

    def __panel__(self):
        return self._layout

tap_test = TapTest()
tap_test.show()