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<?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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