refactor: prove new settings approach

src/includes/settings/class-settings-section.php

@@ -0,0 +1,96 @@
+<?php
+/**
+ * File providing the (new) `SettingsSection` class.
+ *
+ * @package footnotes
+ * @since 2.8.0
+ */
+
+declare(strict_types=1);
+
+namespace footnotes\includes\settings;
+
+use footnotes\admin\layout as Layout;
+
+/**
+ * Class defining plugin settings.
+ *
+ * @package footnotes
+ * @since 2.8.0
+ */
+abstract class SettingsSection {		
+	/**
+	 * Setting options group slug.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	protected string $options_group_slug;
+	
+	/**
+	 * Settings section slug.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	protected string $section_slug = '';
+	
+	/**
+	 * Settings section title.
+	 *
+	 * @var  string
+	 *
+	 * @since  2.8.0
+	 */
+	protected string $title = '';
+	
+	/**
+	 * The groups of settings within this section.
+	 *
+	 * @var  SettingGroup[]
+	 *
+	 * @since  2.8.0
+	 */
+	protected array $settings_groups;
+	
+	protected abstract function load_dependencies(): void;
+	
+	public function add_settings_section(): void {
+		add_settings_section(
+			$this->section_slug, 
+			$this->title, 
+			array($this, 'setting_section_callback'),
+			'footnotes'
+		);
+	}
+	
+	public function add_settings_fields($component): void {
+		foreach($this->settings_groups as $settings_group) {
+			$settings_group->add_settings_fields($component);
+		}
+	}
+	
+	public function setting_section_callback(): void {
+		echo "<hr>";
+	}
+	
+	protected abstract function add_settings_groups(): void;
+	
+	public function get_options_group_slug(): string {
+		return $this->options_group_slug;
+	}
+	
+	public function get_section_slug(): string {
+		return $this->section_slug;
+	}
+	
+	public function get_title(): string {
+		return $this->title;
+	}
+	
+	public function get_settings_group(string $group_id) {
+		return $this->settings_groups[$group_id];
+	}
+}