AddColorSchemeHandler.php

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<?php
 
namespace Elgg\Page;
 
class AddColorSchemeHandler {
    
    public function __invoke(\Elgg\Event $event): ?array {
        if (!elgg_get_config('color_schemes_enabled')) {
            return null;
        }
        
        $vars = $event->getValue();
        
        if (elgg_in_context('admin')) {
            // @todo make admin backend support color schemes
            $vars['html_attrs']['data-color-scheme'] = 'default';
 
            return $vars;
        }
        
        $color_scheme = elgg_get_logged_in_user_entity()?->elgg_color_scheme;
        if (!isset($color_scheme) || $color_scheme === 'browser') {
            return null;
        }
 
        $vars['html_attrs']['data-color-scheme'] = $color_scheme;
    
        return $vars;
    }
}