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<?php |
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namespace Amarkal\Settings; |
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class Manager |
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{ |
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/** |
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* @var Singleton The reference to *Singleton* instance of this class |
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*/ |
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private static $instance; |
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private $pages = array(); |
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private $child_pages = array(); |
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/** |
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* Returns the *Singleton* instance of this class. |
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* |
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* @return Singleton The *Singleton* instance. |
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*/ |
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public static function get_instance() |
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{ |
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if( null === static::$instance ) |
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{ |
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static::$instance = new static(); |
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} |
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return static::$instance; |
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} |
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/** |
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* Add a page to the admin menu. |
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* |
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* @param array $args |
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* @throws \RuntimeException |
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*/ |
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public function add_page($args) |
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{ |
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$slug = $args['slug']; |
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if(array_key_exists($slug,$this->pages)) |
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{ |
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throw new \RuntimeException("A page with slug '$slug' has already been registered"); |
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} |
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$this->pages[$slug] = new Page($args); |
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} |
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/** |
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* Get a page from the set of registered pages. |
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* |
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* @param string $slug |
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* @return Page |
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* @throws \RuntimeException If no page was found for the given slug |
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*/ |
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public function get_page($slug) |
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{ |
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if(!array_key_exists($slug,$this->pages)) |
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{ |
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throw new \RuntimeException("The page '$slug' does not exist"); |
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} |
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return $this->pages[$slug]; |
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} |
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/** |
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* Add a child setting page. |
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* |
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* @param array $args |
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*/ |
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public function add_child_page($args) |
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{ |
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$parent_slug = $args['parent_slug']; |
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if(!array_key_exists($parent_slug, $this->child_pages)) |
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{ |
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$this->child_pages[$parent_slug] = array(); |
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} |
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$this->child_pages[$parent_slug][$args['slug']] = new ChildPage($args); |
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} |
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/** |
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* Get a child page from the set of registered child pages. |
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* |
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* @param string $slug |
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* @param string $parent_slug |
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* @return ChildPage |
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* @throws \RuntimeException If no child page was found for the given slug/parent_slug |
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*/ |
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public function get_child_page($slug, $parent_slug) |
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{ |
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if(!array_key_exists($parent_slug, $this->child_pages) || |
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!array_key_exists($slug, $this->child_pages[$parent_slug])) |
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{ |
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throw new \RuntimeException("The child page '$slug' does not exist for the parent '$parent_slug'"); |
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} |
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return $this->child_pages[$parent_slug][$slug]; |
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} |
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/** |
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* Get the value of the given field. |
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* |
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* @param [string] $field_name |
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* @return mixed |
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*/ |
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public function get_field_value($field_name) |
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{ |
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foreach($this->child_pages as $parent_slug => $child_pages) |
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{ |
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try |
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{ |
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return $this->get_field_value_for_parent($parent_slug, $field_name); |
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} |
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catch(\RuntimeException $e) |
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{ |
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continue; |
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} |
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} |
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\trigger_error("Can't find a component with the name <b>$field_name</b>"); |
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} |
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/** |
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* Get the value of a field within a parent page. |
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* |
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* @param [string] $parent_slug |
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* @param [string] $field_name |
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* @throws RuntimeException if no field was found with the given name |
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* @return mixed |
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*/ |
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public function get_field_value_for_parent($parent_slug, $field_name) |
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{ |
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foreach($this->child_pages[$parent_slug] as $cp) |
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{ |
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try |
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{ |
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$component = $cp->get_component($field_name); |
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$value = \get_option($field_name, $component->default); |
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return $value; |
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} |
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catch(\RuntimeException $e) |
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{ |
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continue; |
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} |
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} |
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throw new \RuntimeException("Can't find a component with the name <b>$field_name</b>"); |
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} |
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/** |
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* Register styles & scripts to be enqueued by settings child pages |
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*/ |
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public function register_scripts() |
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{ |
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\wp_register_style('amarkal-settings', \Amarkal\Core\Utility::path_to_url(__DIR__.'/assets/css/dist/amarkal-settings.min.css')); |
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\wp_register_script('amarkal-settings',\Amarkal\Core\Utility::path_to_url(__DIR__.'/assets/js/dist/amarkal-settings.min.js'),array('amarkal-ui')); |
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} |
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/** |
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* Private constructor to prevent instantiation |
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*/ |
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private function __construct() |
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{ |
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$this->init(); |
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} |
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/** |
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* Register scripts and initiate the request handler. |
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*/ |
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private function init() |
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{ |
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\add_action('admin_init',array($this,'register_scripts')); |
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$rh = RequestHandler::get_instance(); |
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$rh->init(); |
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} |
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} |
Let’s assume you have a class which uses late-static binding:
The code above will run fine in your PHP runtime. However, if you now create a sub-class and call the
getSomeVariable()on that sub-class, you will receive a runtime error:In the case above, it makes sense to update
SomeClassto useselfinstead: