depends.py at 0e4e69a ⋅ holoviz/panel

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from __future__ import absolute_import, division, unicode_literals

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import param

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from .widgets import Widget

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ipywidget_classes = {}

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def param_value_if_widget(arg):

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    if isinstance(arg, Widget):

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        return arg.param.value

    from .pane.ipywidget import IPyWidget

    if IPyWidget.applies(arg) and hasattr(arg, 'value'):

        name = type(arg).__name__

        if name in ipywidget_classes:

            ipy_param = ipywidget_classes[name]

            ipy_param = param.parameterized_class(name, {'value': param.Parameter()})

        ipywidget_classes[name] = ipy_param

        ipy_inst = ipy_param(value=arg.value)

        arg.observe(lambda event: ipy_inst.param.set_param(value=event['new']), 'value')

        return ipy_inst.param.value

    return arg

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def depends(*args, **kwargs):

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    updated_args = [param_value_if_widget(a) for a in  args]

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    updated_kwargs = {k: param_value_if_widget(v) for k, v in kwargs.items()}

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    return param.depends(*updated_args, **updated_kwargs)

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1	2	from __future__ import absolute_import, division, unicode_literals
2
3	2	import param
4
5	2	from .widgets import Widget
6
7	2	ipywidget_classes = {}
8
9
10	2	def param_value_if_widget(arg):
11	2	if isinstance(arg, Widget):
12	2	return arg.param.value
13
14	0	from .pane.ipywidget import IPyWidget
15	0	if IPyWidget.applies(arg) and hasattr(arg, 'value'):
16	0	name = type(arg).__name__
17	0	if name in ipywidget_classes:
18	0	ipy_param = ipywidget_classes[name]
19		else:
20	0	ipy_param = param.parameterized_class(name, {'value': param.Parameter()})
21	0	ipywidget_classes[name] = ipy_param
22	0	ipy_inst = ipy_param(value=arg.value)
23	0	arg.observe(lambda event: ipy_inst.param.set_param(value=event['new']), 'value')
24	0	return ipy_inst.param.value
25	0	return arg
26
27
28	2	def depends(args, *kwargs):
29	2	updated_args = [param_value_if_widget(a) for a in args]
30	2	updated_kwargs = {k: param_value_if_widget(v) for k, v in kwargs.items()}
31
32	2	return param.depends(updated_args, *updated_kwargs)