refactor: prove new settings approach

src/includes/settings/general/class-reference-container-settings-group.php

@@ -0,0 +1,122 @@
+<?php
+/**
+ * File providing the `ReferenceContainerSettingsGroup` class.
+ *
+ * @package footnotes
+ * @since 2.8.0
+ */
+
+declare(strict_types=1);
+
+namespace footnotes\includes\settings\general;
+
+require_once plugin_dir_path( __DIR__ ) . 'class-settings-group.php';
+
+use footnotes\includes\settings\Setting;
+use footnotes\includes\settings\SettingsGroup;
+use footnotes\admin\layout\Settings as SettingsLayout;
+
+/**
+ * Class defining the reference container settings.
+ *
+ * @package footnotes
+ * @since 2.8.0
+ */
+class ReferenceContainerSettingsGroup extends SettingsGroup {		
+	/**
+	 * Setting group ID.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	const GROUP_ID = 'reference-container';
+	
+	/**
+	 * Settings container key for the label of the reference container.
+	 *
+	 * @var  string
+	 *
+	 * @since  1.5.0
+	 */
+	const REFERENCE_CONTAINER_NAME = array(
+		'key' => 'footnote_inputfield_references_label',
+		'name' => 'Reference Container Name',
+		'description' => 'The title of the reference container.',
+		'default_value' => 'Reference',
+		'type' => 'string',
+		'input_type' => 'text'
+	);
+	
+	/**
+	 * The general settings.
+	 *
+	 * @var  Setting[]
+	 *
+	 * @since  2.8.0
+	 */
+	protected array $settings;
+	
+	public function __construct(
+		/**
+		 * Setting options group slug.
+		 *
+		 * @var  string
+		 *
+		 * @since  2.8.0
+		 */
+		protected string $options_group_slug,	
+		
+		/**
+		 * Setting section slug.
+		 *
+		 * @var  string
+		 *
+		 * @since  2.8.0
+		 */
+		protected string $section_slug
+	) {		
+		$this->load_dependencies();
+		
+		$this->add_settings(get_option( $this->options_group_slug ));
+	}
+	
+	protected function load_dependencies(): void {
+		require_once plugin_dir_path( __DIR__ ) . 'class-setting.php';
+	}
+	
+	protected function add_settings(array $options): void {
+		$this->settings = array(
+			self::REFERENCE_CONTAINER_NAME['key'] => $this->add_setting(self::REFERENCE_CONTAINER_NAME)
+		);
+	}
+	
+	private function add_setting(array $setting): Setting {
+		extract( $setting );
+		
+		return new Setting(
+			self::GROUP_ID, 
+			$this->options_group_slug, 
+			$this->section_slug,
+			$key,
+			$name,
+			$description,
+			$default_value,
+			$type,
+			$input_type
+		);
+	}
+	
+	public function add_settings_fields($component): void {
+		foreach ($this->settings as $setting) {			
+			add_settings_field(
+				$setting->key, 
+				__( $setting->name, 'footnotes' ),
+				array ($component, 'setting_field_callback'),
+				'footnotes',
+				$setting->get_section_slug(),
+				$setting->get_setting_field_args()
+			);
+		}
+	}
+}