Custom styles in TinyMCE Style Formats list

In order to add style_formats to TinyMCE you should register them for tinyMCEStyleFormats property. Example of code:

function extendTinyMCEStyleFormats($motopressCELibrary) {

    // add Text highlight

    $motopressCELibrary->tinyMCEStyleFormats[] = array(

        'title' =>'Text highlight',

        'inline' => 'span',

        'classes' => 'text-highlight'

    );

    // add Dropcap

    $motopressCELibrary->tinyMCEStyleFormats[] = array(

        'title' =>'Dropcap',

        'inline' => 'span',

        'classes' => 'dropcap'

    );

}

add_action('mp_library', 'extendTinyMCEStyleFormats', 11, 1);

You’ll get a dropdown ‘Formats’ on tinyMCE panel with your custom formats.