/**
* Creates a new instance. Called on 'after_setup_theme'.
* May be used to access class methods from outside.
*
* @see __construct()
* @return void
*/
public static function instance()
{
null === self::$instance and self::$instance = new self();
return self::$instance;
}
public function __construct()
{
if (!is_admin()) {
return;
}
// set plugin base
self::$plugin = REQUIRED_FIELDS_BASE;
// plugin url
self::$plugin_url = REQUIRED_FIELDS_URL;
// translations
load_plugin_textdomain(self::DOM, false, dirname(plugin_basename(__FILE__)) . '/lang');
// force post to remain as draft if error messages are set
add_filter('wp_insert_post_data', array($this, 'force_draft'), 12, 2);
// force non empty title & content so plugin can take over
add_filter('pre_post_title', array($this, 'mask_empty'));
add_filter('pre_post_content', array($this, 'mask_empty'));
// display & clear any errors
add_action('admin_notices', array($this, 'notice_handler'));
// settings
add_action('admin_init', array($this, 'admin_init'), 9);
// set up vars
$this->post_id = isset($_GET['post']) ? intval($_GET['post']) : 0;
$this->current_user = get_current_user_id();
$this->transient_key = "save_post_error_{$this->post_id}_{$this->current_user}";
// key should be specific to post and the user editing the post
// add settings link
add_filter('plugin_action_links_' . self::$plugin, array($this, 'settings_link'), 10, 1);
// enqueue assets
add_action('admin_enqueue_scripts', array($this, 'scripts'), 100);
}