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"""The FeatureInput enables a user to select from a list of features and set their values""" |
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import panel as pn |
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import param |
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class FeatureInput(pn.widgets.CompositeWidget): |
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"""The FeatureInput enables a user to select from a list of features and set their values |
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## Example |
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```python |
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features = { |
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"A": 1.0, |
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"B": 2.0, |
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"C": 3.0, |
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"D": 4.0, |
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} |
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selected_features = ["A", "C"] |
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widget = FeatureInput(features=features, selected_features=selected_features) |
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``` |
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""" |
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value = param.Dict( |
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doc="The names of the features selected and their set values", allow_None=False |
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) |
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features = param.Dict( |
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doc="The names of the available features and their default values", |
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allow_None=False, |
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) |
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selected_features = param.ListSelector( |
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doc="The list of selected features", allow_None=False |
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) |
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_selected_widgets = param.ClassSelector( |
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class_=pn.Column, doc="The widgets used to edit the selected features" |
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) |
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_composite_type = pn.Column |
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def __init__(self, **params): |
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params["value"] = params.get("value", {}) |
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params["features"] = params.get("features", {}) |
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params["selected_features"] = params.get("selected_features", []) |
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params["_selected_widgets"] = self.param._selected_widgets.class_() |
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super().__init__(**params) |
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selected_features_widget = pn.widgets.MultiChoice.from_param( |
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self.param.selected_features, sizing_mode="stretch_width" |
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) |
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self._composite[:] = [selected_features_widget, self._selected_widgets] |
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@param.depends("features", watch=True, on_init=True) |
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def _reset_selected_features(self): |
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selected_features = [] |
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for feature in self.selected_features.copy(): |
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if feature in self.features.copy(): |
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selected_features.append(feature) |
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self.param.selected_features.objects = list(self.features) |
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self.selected_features = selected_features |
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@param.depends("selected_features", watch=True, on_init=True) |
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def _handle_selected_features_change(self): |
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org_value = self.value |
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self._update_selected_widgets(org_value) |
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self._update_value() |
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def _update_value(self, *args): |
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new_value = {} |
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for widget in self._selected_widgets: |
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new_value[widget.name] = widget.value |
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self.value = new_value |
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def _update_selected_widgets(self, org_value): |
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new_widgets = {} |
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for feature in self.selected_features: |
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value = org_value.get(feature, self.features[feature]) |
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widget = self._new_widget(feature, value) |
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new_widgets[feature] = widget |
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self._selected_widgets[:] = list(new_widgets.values()) |
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def _new_widget(self, feature, value): |
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widget = pn.widgets.FloatInput( |
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name=feature, value=value, sizing_mode="stretch_width" |
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) |
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pn.bind(self._update_value, widget, watch=True) |
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return widget |
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def create_app(): |
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features = { |
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"Blade Length (m)": 73.5, |
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"Cut-in Wind Speed (m/s)": 3.5, |
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"Cut-out Wind Speed (m/s)": 25, |
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"Grid Connection Capacity (MW)": 5, |
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"Hub Height (m)": 100, |
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"Rated Wind Speed (m/s)": 12, |
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"Rotor Diameter (m)": 150, |
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"Turbine Efficiency (%)": 45, |
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"Water Depth (m)": 30, |
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"Wind Speed (m/s)": 10, |
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} |
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selected_features = ["Wind Speed (m/s)", "Rotor Diameter (m)"] |
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widget = FeatureInput( |
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features=features, |
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selected_features=selected_features, |
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width=500, |
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) |
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return pn.FlexBox( |
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pn.Column( |
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"## Widget", |
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widget, |
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), |
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pn.Column( |
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"## Value", |
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pn.pane.JSON(widget.param.value, width=500, height=200), |
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), |
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) |
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if pn.state.served: |
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pn.extension(design="material") |
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create_app().servable() |
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