aldryn_config.py

from aldryn_client import forms


class Form(forms.BaseForm):
    style_set = forms.CharField(
        'The "styles definition set" to use in the editor',
        required=False,
    )
    content_css = forms.CharField(
        'List of CSS files to be used to apply style to editor content',
        required=False,
    )

    def clean(self):
        data = super().clean()

        if data.get('content_css'):
            files = data['content_css'].split(',')
            data['content_css'] = [item.strip() for item in files if item]
        return data

    def to_settings(self, data, settings):
        ckeditor_settings = {
            'height': 300,
            'language': '{{ language }}',
            'toolbar': 'CMS',
            'skin': 'moono-lisa',
        }

        if data.get('content_css'):
            ckeditor_settings['contentsCss'] = data['content_css']
        else:
            ckeditor_settings['contentsCss'] = ['/static/css/base.css']

        style_set = ''
        if data.get('style_set'):
            style_set = data['style_set']

        ckeditor_settings['stylesSet'] = f'default:{style_set}'

        settings['CKEDITOR_SETTINGS'] = ckeditor_settings
        return settings