Make Bound Functions and Parameters work the same. #6543
Description
panel==1.4.0rc3
In Panel we are promoting the concept of references. And references includes bound functions and parameters.
For example in the tutorial Intermediate Interactivity we promote bound functions and parameters as substitutes for each.
But in practice they are treated very differently by pn.panel and hv.DynamicMap as you can see from below example.
This makes it hard to create a mental model of what to expect. This makes it hard to transition from one approach to other approach.
Please make the two approaches equivalent.
On the left you see a bound function. On the right a Parameter.
import panel as pn
import param
import pandas as pd
import numpy as np
import hvplot.pandas
import holoviews as hv
pn.extension()
class Data(param.Parameterized):
value = param.DataFrame()
submit = param.Event()
@pn.depends("submit", watch=True, on_init=True)
def _update_value(self):
x = np.random.rand(10)
y = np.random.rand(10)
self.value = pd.DataFrame({"x": x, "y": y})
class BoundStorage(param.Parameterized):
data = param.ClassSelector(class_=Data, allow_refs=True)
@pn.depends("data.value")
def plot(self):
return self.data.value.hvplot(x="x", y="y")
class WatchStorage(param.Parameterized):
data = param.ClassSelector(class_=Data, allow_refs=True)
plot = param.Parameter()
@pn.depends("data.value", watch=True, on_init=True)
def _update_plot(self):
self.plot = self.data.value.hvplot(x="x", y="y")
data = Data()
bound_view = BoundStorage(data=data)
watch_view = WatchStorage(data=data)
pn.Column(
data.param.submit,
"## pn.panel",
pn.Row(bound_view.plot, watch_view.param.plot),
"## pn.pane.HoloViews",
pn.Row(
pn.pane.HoloViews(bound_view.plot), pn.pane.HoloViews(watch_view.param.plot)
),
"## pn.pane.HoloViews and hv.DynamicMap",
pn.Row(
pn.pane.HoloViews(hv.DynamicMap(bound_view.plot)),
"ValueError: Callable parameter 'Callable.callable' only takes a callable object, not objects of <class 'param.parameterized.Parameter'>.",
), # pn.pane.HoloViews(hv.DynamicMap(watch_view.param.plot))),
).servable()