/**
* Return an instance of this class.
*
* @since 1.0.0
*
* @return object A single instance of this class.
*/
public static function get_instance()
{
// If the single instance hasn't been set, set it now.
if (null == self::$instance) {
self::$instance = new self();
}
return self::$instance;
}
/**
* Initialize the plugin by loading admin scripts & styles and adding a
* settings page and menu.
*
* @since 1.0.0
*/
private function __construct()
{
// Call $plugin_slug from public plugin class.
$plugin = Gravity_Forms_Math_Captcha::get_instance();
$this->plugin_slug = $plugin->get_plugin_slug();
// Add an admin notice if Gravity Forms isn't installed.
add_action('admin_notices', array($this, 'admin_warning'));
// Add the math captcha field to the Gravity Forms editor.
add_filter('gform_add_field_buttons', array($this, 'add_math_captcha_field'));
add_filter('gform_field_type_title', array($this, 'add_math_captcha_title'), 10, 2);
add_action('gform_editor_js', array($this, 'math_captcha_gform_editor_js'));
add_action('gform_field_standard_settings', array($this, 'math_captcha_settings'), 10, 2);
add_filter('gform_tooltips', array($this, 'math_captcha_type_tooltip'));
}