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import param
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from bokeh.themes import Theme as _BkTheme, _dark_minimal
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class Theme(param.Parameterized):
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"""
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A Theme customizes the look and feel of a Template by providing
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custom CSS and bokeh Theme class.
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When adding a new theme a generic Theme class should be created,
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which is what users will important and set on the Template.theme
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parameter. Additionally a concrete implementation of the Theme
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should be created specific to the particular Template being used.
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For example when adding a DarkTheme there should be a
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corresponding MaterialDarkTheme which declares the Template class
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on its _template class variable. In this way a user can always use
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the generic Theme but the actual CSS and bokeh Theme will depend
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on the exact Template being used.
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"""
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css = param.Filename()
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bokeh_theme = param.ClassSelector(class_=(_BkTheme, str))
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_template = None
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__abstract = True
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@classmethod
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def find_theme(cls, template_type):
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if cls._template is template_type:
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return cls
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for theme in param.concrete_descendents(cls).values():
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if theme._template is template_type:
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return theme
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class DefaultTheme(Theme):
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"""
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The DefaultTheme uses the standard Panel color palette.
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"""
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BOKEH_DARK = dict(_dark_minimal.json)
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BOKEH_DARK['attrs']['Figure'].update({
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"background_fill_color": "#3f3f3f",
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"border_fill_color": "#2f2f2f",
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})
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class DarkTheme(Theme):
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"""
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The DefaultTheme uses the standard Panel color palette.
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"""
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bokeh_theme = param.ClassSelector(class_=(_BkTheme, str),
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default=_BkTheme(json=BOKEH_DARK))
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MarcSkovMadsen