Bokeh widget themes

[JohnLunzer]

There is a way to get Bokeh plots to take themes.

This call to bokeh.embed.component in the Bokeh widget takes a theme argument. The passed argument needs to be in the form of a bokeh.themes.Theme object which can take a filename (yaml file) or a dict (see source for example) as an argument on instantiation.

I wanted to take it upon myself to modify the code but I think I don't understand widget properties well enough. I tried to add a theme property by adding a new method with the @event.prop decorator but I can't get _plot_components method to recognize the theme value I pass into the BokehWidget. My modified example from the docs, passing a theme argument runs fine but the colors of the plots don't change.

Any guidance would be greatly appreciated.

Here is a "dark theme" for a yaml file:

attrs:
    Figure:
        background_fill_color: '#1C1C1C'
        border_fill_color: '#1C1C1C'
        outline_line_color: '#444444'
    Axis:
        axis_line_color: "white"
        axis_label_text_color: "white"
        major_label_text_color: "white"
        major_tick_line_color: "white"
        minor_tick_line_color: "white"
        minor_tick_line_color: "white"
    Grid:
        grid_line_dash: [6, 4]
        grid_line_alpha: .3
    Title:
        text_color: "white"
    Legend:
        label_text_color: "white"
        background_fill_color: '#121212'
        background_fill_alpha: 0.6