From 0d1da4356173e926fdcac42462daa4fcb7617109 Mon Sep 17 00:00:00 2001
From: Daniel Weipert <code@drogueronin.de>
Date: Mon, 21 Dec 2020 16:11:17 +0100
Subject: Initial commit

---
 src/class-draggable-post-order.php | 175 +++++++++++++++++++++++++++++++++++++
 1 file changed, 175 insertions(+)
 create mode 100644 src/class-draggable-post-order.php

(limited to 'src/class-draggable-post-order.php')

diff --git a/src/class-draggable-post-order.php b/src/class-draggable-post-order.php
new file mode 100644
index 0000000..ae9b501
--- /dev/null
+++ b/src/class-draggable-post-order.php
@@ -0,0 +1,175 @@
+<?php
+/**
+ * Entry point class file
+ *
+ * @package Draggable_Post_Order
+ */
+
+namespace Draggable_Post_Order;
+
+/**
+ * Class DraggablePostOrder
+ *
+ * @package Draggable_Post_Order
+ */
+class Draggable_Post_Order {
+
+	/**
+	 * Initialize.
+	 */
+	public static function init() {
+		$post_types = get_post_types_by_support( 'draggable-post-order' );
+
+		// if there are no post types to order => return.
+		if ( empty( $post_types ) ) {
+			return;
+		}
+
+		foreach ( $post_types as $post_type ) {
+			add_action( "save_post_{$post_type}", [ self::class, 'save_post' ], 10, 2 );
+		}
+
+		// add meta box.
+		add_action( 'add_meta_boxes', [ self::class, 'add_meta_boxes' ] );
+
+		// add ajax hook.
+		add_action( 'wp_ajax_update-post-order', [ self::class, 'update_post_order' ] );
+
+		// load scripts.
+		add_action( 'admin_enqueue_scripts', [ self::class, 'enqueue_scripts' ] );
+
+		// sort posts by post order.
+		add_action( 'pre_get_posts', [ self::class, 'order_posts' ] );
+	}
+
+	/**
+	 * Whether the given post type is allowed to be ordered.
+	 *
+	 * @param string $post_type The post type to check against.
+	 *
+	 * @return bool
+	 */
+	public static function supports( $post_type = null ) {
+		$post_type ??= get_current_screen()->post_type ?? '';
+
+		return post_type_supports( $post_type, 'draggable-post-order' );
+	}
+
+	/**
+	 * Callback for "save_post" action.
+	 *
+	 * @param int      $post_id The post's ID.
+	 * @param \WP_Post $post    The post object.
+	 */
+	public static function save_post( $post_id, $post ) {
+		if (
+			( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) ||
+			! check_admin_referer( 'metaBoxDraggablePostOrder', 'metaBoxDraggablePostOrder' ) ||
+			( ! isset( $_POST['post_ID'] ) || intval( $_POST['post_ID'] ) !== intval( $post_id ) ) ||
+			! isset( $_POST['draggable-post-order'] )
+		) {
+			return;
+		}
+
+		$post_order = sanitize_text_field( wp_unslash( $_POST['draggable-post-order'] ) );
+		if ( empty( $post_order ) ) {
+			$post_order = wp_count_posts( $post->post_type )->publish;
+		}
+
+		update_post_meta( $post_id, 'draggable-post-order', $post_order );
+	}
+
+	/**
+	 * Callback for "add_meta_boxes" action.
+	 */
+	public static function add_meta_boxes() {
+		if ( ! self::supports() ) {
+			return;
+		}
+
+		add_meta_box( 'draggable-post-order', __( 'Post Order', 'draggable-post-order' ), [ self::class, 'add_meta_box' ], '', 'side' );
+	}
+
+	/**
+	 * Callback for "add_meta_box" function.
+	 *
+	 * @param \WP_Post $post The post object.
+	 */
+	public static function add_meta_box( $post ) {
+		wp_nonce_field( 'metaBoxDraggablePostOrder', 'metaBoxDraggablePostOrder' );
+		?><input type="number" name="draggable-post-order" value="<?php echo get_post_meta( $post->ID, 'draggable-post-order', true ); ?>">
+		<?php
+	}
+
+	/**
+	 * Callback for "wp_ajax" action.
+	 */
+	public static function update_post_order() {
+		if ( ! isset( $_POST['page'] ) || ! isset( $_POST['perPage'] ) || ! isset( $_POST['postOrder'] ) ) {
+			return;
+		}
+
+		$page     = intval( $_POST['page'] );
+		$per_page = intval( $_POST['perPage'] );
+		parse_str( $_POST['postOrder'], $post_order );
+
+		foreach ( $post_order['post'] as $order => $post_id ) {
+			$order = intval( $order ) + 1;
+			update_post_meta( $post_id, 'draggable-post-order', ( ( $page - 1 ) * $per_page ) + $order );
+		}
+	}
+
+	/**
+	 * Callback for "admin_enqueue_scripts" action.
+	 */
+	public static function enqueue_scripts() {
+		$current_screen = get_current_screen();
+		if ( $current_screen->base !== 'edit' || ! self::supports() ) {
+			return;
+		}
+
+		list('dependencies' => $dependencies, 'version' => $version) = require draggable_post_order_path() . '/build/index.asset.php';
+		$dependencies[] = 'jquery-ui-sortable';
+		wp_enqueue_script( 'draggable-post-order', draggable_post_order_assets_url( 'index.js' ), $dependencies, $version, true );
+		wp_enqueue_style( 'draggable-post-order', draggable_post_order_assets_url( 'index.css' ), [], $version );
+	}
+
+	/**
+	 * Callback for "pre_get_posts" action.
+	 *
+	 * @param \WP_Query $query The query object.
+	 */
+	public static function order_posts( \WP_Query $query ) {
+		$post_type = $query->get( 'post_type' );
+		if ( ! self::supports( $post_type ) ) {
+			return;
+		}
+
+		// if no orderby was set previously.
+		if ( ! $query->get( 'orderby' ) ) {
+			$meta_sub_query = [
+				'relation'                           => 'OR',
+				'draggable-post-order-clause'        => [
+					'key'  => 'draggable-post-order',
+					'type' => 'NUMERIC',
+				],
+				// get all posts without the meta as well.
+				'draggable-post-order-exists-clause' => [
+					'key'     => 'draggable-post-order',
+					'compare' => 'NOT EXISTS',
+				],
+			];
+			$meta_query   = $query->get( 'meta_query' ) ?: [];
+			$meta_query[] = $meta_sub_query;
+
+			$order   = apply_filters( 'draggable_post_order_order', 'ASC', $post_type, $query );
+			$orderby = [
+				'draggable-post-order-clause'        => $order,
+				'draggable-post-order-exists-clause' => $order,
+			];
+
+			$query->set( 'meta_query', $meta_query );
+			$query->set( 'orderby', $orderby );
+		}
+	}
+}
-- 
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