updated-meta-box.php

<?php
/*
Plugin Name: Gallery Metabox
Plugin URI: http://wordpress.org/extend/plugins/gallery-metabox/
Description: Displays all the post's attached images on the Edit screen
Author: Bill Erickson
Version: 1.5.1
Author URI: http://www.billerickson.net
*/

class BE_Gallery_Metabox
{

	/**
	 * This is our constructor
	 *
	 * @return BE_Gallery_Metabox
	 */
	public function __construct() {

		add_action( 'add_meta_boxes',          array( $this, 'admin_scripts'   ), 5 );
		add_action( 'add_meta_boxes',          array( $this, 'metabox_add'     )    );
		add_action( 'wp_ajax_refresh_metabox', array( $this, 'refresh_metabox' )    );
		add_action( 'wp_ajax_gallery_remove',  array( $this, 'gallery_remove'  )    );
	}

	/**
	 * AJAX scripts to load on call
	 * @since 1.5
	 *
	 * @author Bill Erickson
	 */

	public function admin_scripts() {

		wp_register_script( 'gallery-metabox-ajax', get_template_directory_uri() . '/includes/gallery-metabox/lib/js/gallery-metabox-ajax.js', array( 'jquery' ), null, true );
		wp_register_style( 'gallery-metabox-style', get_template_directory_uri() .'/includes/gallery-metabox/lib/css/gallery-metabox-style.css', array(), null, 'all' );

	}
	/**
	 * Add the Metabox
	 * @since 1.0
	 *
	 * @author Bill Erickson
	 */
	public function metabox_add() {
		// Filterable metabox settings. 
		$post_types		= apply_filters( 'be_gallery_metabox_post_types', array( 'post', 'page') );
		$context		= apply_filters( 'be_gallery_metabox_context', 'normal' );
		$priority		= apply_filters( 'be_gallery_metabox_priority', 'high' );
		
		// Loop through all post types
		foreach( $post_types as $post_type ) {
			
			// Get post ID
			if( isset( $_GET['post'] ) ) $post_id = $_GET['post'];
			elseif( isset( $_POST['post_ID'] ) ) $post_id = $_POST['post_ID'];
			if( !isset( $post_id ) ) $post_id = false;
			
			// Granular filter so you can limit it to single page or page template
			if( apply_filters( 'be_gallery_metabox_limit', true, $post_id ) ) {
				// Add Metabox
				add_meta_box( 'be_gallery_metabox', __( 'Gallery Images', 'gallery-metabox' ), array( $this, 'gallery_metabox' ), $post_type, $context, $priority );
				// Add Necessary Scripts and Styles
				wp_enqueue_script( 'thickbox' );
				wp_enqueue_style( 'thickbox' );
				wp_enqueue_script( 'gallery-metabox-ajax' );
				wp_enqueue_style( 'gallery-metabox-style' );
			}

		}
	}

	/**
	 * Build the Metabox
	 * @since 1.0
	 *
	 * @param object $post
	 *
	 * @author Bill Erickson
	 */

	public function gallery_metabox( $post ) {
		
		$original_post = $post;
		echo $this->gallery_metabox_html( $post->ID );
		$post = $original_post;
	}

	/** 
	 * Image array for gallery metabox
	 * @since 1.3
	 *
	 * @param int $post_id
	 * @return string html output 
	 *
	 * @author Bill Erickson
	 */
	public function gallery_images( $post_id ) {

		$args = array(
			'post_type'         => 'attachment',
			'post_status'       => 'inherit',
			'post_parent'       => $post_id,
			'post_mime_type'    => 'image',
			'posts_per_page'    => -1,
			'order'             => 'ASC',
			'orderby'           => 'menu_order',
			);

		$args = apply_filters( 'be_gallery_metabox_args', $args );

		$images = get_posts( $args );

		return $images;

	}

	/** 
	 * Display setup for images, which include filters and AJAX return
	 * @since 1.3
	 *
	 * @param int $post_id
	 * @return string html output 
	 *
	 * @author Bill Erickson
	 */
	public function gallery_display( $loop ) {

		$gallery = '<div class="be-image-wrapper">';
		foreach( $loop as $image ):
		
			$thumbnail	= wp_get_attachment_image_src( $image->ID, apply_filters( 'be_gallery_metabox_image_size', 'thumbnail' ) );

			$gallery .= apply_filters( 'be_gallery_metabox_output', '<img src="' . esc_url( $thumbnail[0] ) . '" alt="' . esc_attr( $image->post_title ) . '" rel="' . esc_attr( $image->ID ) . '" title="' . esc_attr( $image->post_content ) . '" /> ', $thumbnail[0], $image );
      
      // removal button
			$gallery .= apply_filters( 'be_gallery_metabox_remove', '<span class="be-image-remove" rel="' . $image->ID .'"><img src="' . get_template_directory_uri().'/includes/gallery-metabox/lib/img/cross-circle.png' . '" alt="Remove Image" title="Remove Image"></span>' ); 
		
		endforeach;

		$gallery .= '</div>';

		return $gallery;

	}

	/** 
	 * Gallery Metabox HTML 
	 * @since 1.3
	 *
	 * @param int $post_id
	 * @return string html output 
	 *
	 * @author Bill Erickson
	 */
	public function gallery_metabox_html( $post_id ) {
		
		$return = '';
		
		$intro	= '<p class="be-metabox-links">';
		$intro	.= '<a href="media-upload.php?post_id=' . $post_id .'&amp;type=image&amp;TB_iframe=1&amp;width=640&amp;height=715" id="add_image" class="be-button thickbox button-secondary" title="' . __( 'Add Image', 'gallery-metabox' ) . '">' . __( 'Upload Images', 'gallery-metabox' ) . '</a>';
		$intro	.= '<a href="media-upload.php?post_id=' . $post_id .'&amp;type=image&amp;tab=gallery&amp;TB_iframe=1&amp;width=640&amp;height=715" id="manage_gallery" class="thickbox be-button button-secondary" title="' . __( 'Manage Gallery', 'gallery-metabox' ) . '">' . __( 'Manage Gallery', 'gallery-metabox' ) . '</a>';
		$intro	.= '<input id="update-gallery" class="be-button button-secondary" type="button" value="' . __( 'Update Gallery', 'gallery-metabox' ) . '" name="update-gallery"></p>';
		
		$return .= apply_filters( 'be_gallery_metabox_intro', $intro );

		
		$loop = $this->gallery_images( $post_id );

		if( empty( $loop ) )
			$return .= '<p>' . __( 'No images', 'gallery-metabox' ) . '.</p>';

		$gallery = $this->gallery_display( $loop );

		$return .= $gallery;

		return $return;
	}

	/**
	 * Gallery Metabox AJAX Update
	 * @since 1.5
	 *
	 * This function will refresh image gallery on AJAX call.
	 *
	 *
	 * @author Andrew Norcross
	 *
	 */
	
	public function refresh_metabox() {

		$parent	= $_POST['parent'];
		$loop = $this->gallery_images( $parent );
		$images	= $this->gallery_display( $loop );

		$ret = array();

		if( !empty( $parent ) ) {
			$ret['success'] = true;
			$ret['gallery'] = $images;
		} else {
			$ret['success'] = false;
		}

		echo json_encode( $ret );
		die();
	}

	/**
	 * Gallery image removal
	 * @since 1.5
	 *
	 * This function will remove the image from the gallery by setting
	 * the post_parent to 0
	 *
	 * @author Andrew Norcross
	 *
	 */
	
	public function gallery_remove() {

		// content from AJAX post
		$image = $_POST['image'];
		$parent	= $_POST['parent'];

		// no image ID came through, so bail
		if( empty( $image ) ) {
			$ret['success'] = false;
			echo json_encode( $ret );
			die();
		}

		// removal function
		$remove                 = array();
		$remove['ID']           = $image;
		$remove['post_parent']	= 0;

		$update = wp_update_post( $remove );

		// AJAX return array
		$ret = array();

		if( $update !== 0 ) {

			// loop to refresh the gallery
			$loop = $this->gallery_images( $parent );
			$images	= $this->gallery_display( $loop );
			// return values
			$ret['success'] = true;
			$ret['gallery'] = $images;

		} else {
			// failure return. can probably make more verbose
			$ret['success'] = false;

		}

		echo json_encode( $ret );
		die();
	}

}


// Instantiate our class
$BE_Gallery_Metabox = new BE_Gallery_Metabox();