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wp-content/plugins/wordpress-seo/admin/metabox/class-metabox-collapsible.php

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+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin
+ */
+
+/**
+ * Generates the HTML for a metabox tab.
+ */
+class WPSEO_Metabox_Collapsible implements WPSEO_Metabox_Tab {
+
+	/**
+	 * The collapsible's unique identifier.
+	 *
+	 * @var string
+	 */
+	private $name;
+
+	/**
+	 * The content to be displayed inside the collapsible.
+	 *
+	 * @var string
+	 */
+	private $content;
+
+	/**
+	 * The label.
+	 *
+	 * @var string
+	 */
+	private $link_content;
+
+	/**
+	 * Constructor.
+	 *
+	 * @param string $name         The name of the tab, used as an identifier in the html.
+	 * @param string $content      The tab content.
+	 * @param string $link_content The text content of the tab link.
+	 */
+	public function __construct( $name, $content, $link_content ) {
+		$this->name         = $name;
+		$this->content      = $content;
+		$this->link_content = $link_content;
+	}
+
+	/**
+	 * Returns the html for the tab link.
+	 *
+	 * @return string
+	 */
+	public function link() {
+		return $this->link_content;
+	}
+
+	/**
+	 * Returns the html for the tab content.
+	 *
+	 * @return string
+	 */
+	public function content() {
+		$collapsible_paper = new WPSEO_Paper_Presenter(
+			$this->link(),
+			null,
+			[
+				'content'      => $this->content,
+				'collapsible'  => true,
+				'class'        => 'metabox wpseo-form wpseo-collapsible-container',
+				'paper_id'     => 'collapsible-' . $this->name,
+			]
+		);
+
+		return $collapsible_paper->get_output();
+	}
+
+	/**
+	 * Returns the collapsible's unique identifier.
+	 *
+	 * @return string
+	 */
+	public function get_name() {
+		return $this->name;
+	}
+}