[Feature Request] Allow custom function for nodeRepulsion attribute in cose layout

[jlalbers]

Description

I am currently using the cose layout for a project to present a large number of nodes in a small space. Depending on the user actions within the app, the style of different nodes are updated via callbacks. I would also like to use a custom function for the nodeRepulsion property of the cose layout that can be modified via a callback. This is how the Cytoscape JS cose layout works, as referenced here, and would allow me to dynamically alter the repulsion for a subset of nodes based on user input. However, Dash Cytoscape currently only allows a static numeric value to be used which is applied to all nodes.

Steps/Code to Reproduce

import dash
import dash_cytoscape as cyto
from dash import html

def custom_nodeRepulsion_func(node):
    # Logic for returning a numeric repulsion value for the node
    return 2048

app = dash.Dash(__name__)

app.layout = html.Div([
    ...
    cyto.Cytoscape(
        id='cytoscape',
        elements=[ ... ],
        layout={'name': 'cose', 'nodeRepulsion': custom_nodeRepulsion_func}
    )
    ...
])

if __name__ == '__main__':
    app.run_server(debug=True)

Expected Results

Ideally, the custom function would calculate the node repulsion for each node while building the cose layout. This would allow for a dynamic physics-based node layout based on the user input.

Actual Results

Dash app displays "Error loading layout".

Versions

Dash 2.15.0 Dash Cytoscape 1.0.0