thank you for the hint. I researched a bit from other widgets, but I still cannot find a clear pattern. Here my latest changes:
- changed “panel/panel/widgets/custom.py”:
import param
from ..models import Custom as _BkCustom
from typing import ClassVar, Mapping
from bokeh.model import Model
from bokeh.models.widgets import Div as _BkDiv
from .base import Widget
class Custom(Widget):
avallo = param.String(default='this is the default')
_rename: ClassVar[Mapping[str, str | None]] = {'name': None, 'avallo': 'text'}
_widget_type: ClassVar[type[Model]] = _BkDiv
- changed “panel/panel/models/custom.ts”:
import * as p from "@bokehjs/core/properties"
import {Div, DivView} from "@bokehjs/models/widgets/div"
export class CustomView extends DivView {
declare model: Custom
}
export namespace Custom {
export type Attrs = p.AttrsOf<Props>
export type Props = Div.Props & {
textolo: p.Property<string>
}
}
export interface Custom extends Custom.Attrs {}
export class Custom extends Div {
declare properties: Custom.Props
declare __view_type__: CustomView
constructor(attrs?: Partial<Custom.Attrs>) {
super(attrs)
}
static {
this.prototype.default_view = CustomView
this.define<Custom.Props>(({Str}) => ({
textolo: [ Str, "Custom text" ],
}))
}
}```
now after a build I can successfully display an instance (pn.widgets.Custom(avallo=“ciao”)), but using default Bokeh models (i.e. _BkDiv). With my extended model (_BkCustom), which should really just be a wrapper around _BkDiv, I get the following exception:
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
File /opt/conda/lib/python3.11/site-packages/IPython/core/formatters.py:974, in MimeBundleFormatter.__call__(self, obj, include, exclude)
971 method = get_real_method(obj, self.print_method)
973 if method is not None:
--> 974 return method(include=include, exclude=exclude)
975 return None
976 else:
File ~/package/panel/viewable.py:817, in Viewable._repr_mimebundle_(self, include, exclude)
815 doc = Document()
816 comm = state._comm_manager.get_server_comm()
--> 817 model = self._render_model(doc, comm)
818 if config.embed:
819 return render_model(model)
File ~/package/panel/viewable.py:735, in Viewable._render_model(self, doc, comm)
733 if comm is None:
734 comm = state._comm_manager.get_server_comm()
--> 735 model = self.get_root(doc, comm)
737 if self._design and self._design.theme.bokeh_theme:
738 doc.theme = self._design.theme.bokeh_theme
File ~/package/panel/viewable.py:666, in Renderable.get_root(self, doc, comm, preprocess)
664 wrapper = self._design._wrapper(self)
665 if wrapper is self:
--> 666 root = self._get_model(doc, comm=comm)
667 if preprocess:
668 self._preprocess(root)
File ~/package/panel/widgets/base.py:136, in Widget._get_model(self, doc, root, parent, comm)
132 def _get_model(
133 self, doc: Document, root: Optional[Model] = None,
134 parent: Optional[Model] = None, comm: Optional[Comm] = None
135 ) -> Model:
--> 136 model = self._widget_type(**self._get_properties(doc))
137 root = root or model
138 self._models[root.ref['id']] = (model, parent)
File /opt/conda/lib/python3.11/site-packages/bokeh/models/ui/ui_element.py:62, in UIElement.__init__(self, *args, **kwargs)
61 def __init__(self, *args, **kwargs) -> None:
---> 62 super().__init__(*args, **kwargs)
File /opt/conda/lib/python3.11/site-packages/bokeh/model/model.py:119, in Model.__init__(self, *args, **kwargs)
116 if "id" in kwargs:
117 raise ValueError("initializing 'id' is not allowed")
--> 119 super().__init__(**kwargs)
120 default_theme.apply_to_model(self)
File /opt/conda/lib/python3.11/site-packages/bokeh/core/has_props.py:306, in HasProps.__init__(self, **properties)
304 if value is Undefined or value is Intrinsic:
305 continue
--> 306 setattr(self, name, value)
308 initialized = set(properties.keys())
309 for name in self.properties(_with_props=True): # avoid set[] for deterministic behavior
File /opt/conda/lib/python3.11/site-packages/bokeh/core/has_props.py:344, in HasProps.__setattr__(self, name, value)
341 if isinstance(descriptor, property): # Python property
342 return super().__setattr__(name, value)
--> 344 self._raise_attribute_error_with_matches(name, properties)
File /opt/conda/lib/python3.11/site-packages/bokeh/core/has_props.py:379, in HasProps._raise_attribute_error_with_matches(self, name, properties)
376 if not matches:
377 matches, text = sorted(properties), "possible"
--> 379 raise AttributeError(f"unexpected attribute {name!r} to {self.__class__.__name__}, {text} attributes are {nice_join(matches)}")
AttributeError: unexpected attribute 'align' to Custom, possible attributes are context_menu, css_classes, css_variables, js_event_callbacks, js_property_callbacks, name, styles, stylesheets, subscribed_events, syncable, tags, text or visible
From what I can understand, the Constructor for the view does not cover the same attributes as the ones passed by the constructor from Widget (from “panel/panel/widgets/base.py”).
Does it rely on the use of UIElement? I also tried with the following classes:
from bokeh.models.widgets import InputWidget, Widget
but instead I do not get shown anything (no exception though).
