Theme Preview on Admin Page

[AntonShevchuk]

I have trouble with my theme Constructor - I write following code for register stylesheet generated by PHP:

wp_enqueue_style( 'constructor-custom-style', get_option('home').'/?theme-constructor=css');

But this is code doesn't work with theme preview, because correct url for preview is '/?theme-constructor=css&preview=1&template=constructor'

I found simple solution, but this is requried changes of Wordpress source code in file wp-includes/theme.php:

function preview_theme_ob_filter( $content ) {
    // apply new filter
    $content = apply_filters('preview_theme_ob_filter', $content); // add filter for preview content
    return preg_replace_callback( "|(<a.*?href=([\"']))(.*?)([\"'].*?>)|", 'preview_theme_ob_filter_callback', $content );
}

I can use this is filter in my function.php:

function constructor_preview($content) {
   $link = add_query_arg(array('preview' => 1, 'template' => get_template()), '?theme-constructor=css');
   $content = str_replace('?theme-constructor=css', $link, $content);
   return $content;
  }
add_filter('preview_theme_ob_filter', 'constructor_preview');

[nacin]

There's not enough information here for me to go on.

It also looks like an edge case: wp_enqueue_style( 'constructor-custom-style', get_option('home').'/?theme-constructor=css'); means you're loading WordPress *again* just to generate CSS. This is bad.

​http://ottopress.com/2010/dont-include-wp-load-please/ (Use the Right Way the First, not the Second).

You should probably just capture when it is a preview and add the query args yourself to the wp_enqueue_style() call.