fooplugins / foogallery

includes/admin/class-gallery-metaboxes.php

<?php

/*
 * FooGallery Admin Gallery MetaBoxes class
 */

if ( ! class_exists( 'FooGallery_Admin_Gallery_MetaBoxes' ) ) {

	class FooGallery_Admin_Gallery_MetaBoxes {

		private $_gallery;

		public function __construct() {
			//add our foogallery metaboxes
			add_action( 'add_meta_boxes_' . FOOGALLERY_CPT_GALLERY, array( $this, 'add_meta_boxes_to_gallery' ) );

			//save extra post data for a gallery
			add_action( 'save_post', array( $this, 'save_gallery' ) );

			//save custom field on a page or post
			add_action( 'save_post', array( $this, 'attach_gallery_to_post' ), 10, 2 );

			//whitelist metaboxes for our gallery postype
			add_filter( 'foogallery_metabox_sanity', array( $this, 'whitelist_metaboxes' ) );

			//add scripts used by metaboxes
			add_action( 'admin_enqueue_scripts', array( $this, 'include_required_scripts' ) );

			// Ajax calls for creating a page for the gallery
			add_action( 'wp_ajax_foogallery_create_gallery_page', array( $this, 'ajax_create_gallery_page' ) );

			// Ajax call for clearing thumb cache for the gallery
			add_action( 'wp_ajax_foogallery_clear_gallery_thumb_cache', array( $this, 'ajax_clear_gallery_thumb_cache' ) );

			// Ajax call for generating a gallery preview
			add_action( 'wp_ajax_foogallery_preview', array( $this, 'ajax_gallery_preview' ) );

			//handle previews that have no attachments
			add_action( 'foogallery_template_no_attachments', array( $this, 'preview_no_attachments' ) );
		}

		public function whitelist_metaboxes() {
			return array(
				FOOGALLERY_CPT_GALLERY => array(
					'whitelist'  => apply_filters( 'foogallery_metabox_sanity_foogallery',
						array(
							'submitdiv',
							'slugdiv',
							'postimagediv',
							'foogallery_items',
							'foogallery_settings',
							'foogallery_help',
							'foogallery_pages',
							'foogallery_customcss',
							'foogallery_sorting',
							'foogallery_thumb_settings',
							'foogallery_retina'
						) ),
					'contexts'   => array( 'normal', 'advanced', 'side', ),
					'priorities' => array( 'high', 'core', 'default', 'low', ),
				)
			);
		}

		public function add_meta_boxes_to_gallery( $post ) {

			add_meta_box(
				'foogallery_items',
				__( 'Gallery Items', 'foogallery' ),
				array( $this, 'render_gallery_media_metabox' ),
				FOOGALLERY_CPT_GALLERY,
				'normal',
				'high'
			);

			add_meta_box(
				'foogallery_settings',
				__( 'Gallery Settings', 'foogallery' ),
				array( $this, 'render_gallery_settings_metabox' ),
				FOOGALLERY_CPT_GALLERY,
				'normal',
				'high'
			);

			add_meta_box(
				'foogallery_help',
				__( 'Gallery Shortcode', 'foogallery' ),
				array( $this, 'render_gallery_shortcode_metabox' ),
				FOOGALLERY_CPT_GALLERY,
				'side',
				'default'
			);

			if ( 'publish' == $post->post_status ) {
				add_meta_box( 'foogallery_pages',
					__( 'Gallery Usage', 'foogallery' ),
					array( $this, 'render_gallery_usage_metabox' ),
					FOOGALLERY_CPT_GALLERY,
					'side',
					'high'
				);
			}

			add_meta_box(
				'foogallery_customcss',
				__( 'Custom CSS', 'foogallery' ),
				array( $this, 'render_customcss_metabox' ),
				FOOGALLERY_CPT_GALLERY,
				'normal',
				'low'
			);

			add_meta_box(
				'foogallery_retina',
				__( 'Retina Support', 'foogallery' ),
				array( $this, 'render_retina_metabox' ),
				FOOGALLERY_CPT_GALLERY,
				'side',
				'default'
			);

			add_meta_box(
				'foogallery_sorting',
				__( 'Gallery Sorting', 'foogallery' ),
				array( $this, 'render_sorting_metabox' ),
				FOOGALLERY_CPT_GALLERY,
				'side',
				'default'
			);

			add_meta_box(
				'foogallery_thumb_settings',
				__( 'Thumbnails', 'foogallery' ),
				array( $this, 'render_thumb_settings_metabox' ),
				FOOGALLERY_CPT_GALLERY,
				'side',
				'default'
			);
		}

		public function get_gallery( $post ) {
			if ( ! isset($this->_gallery) ) {
				$this->_gallery = FooGallery::get( $post );

				//attempt to load default gallery settings from another gallery, as per FooGallery settings page
				$this->_gallery->load_default_settings_if_new();
			}

			return $this->_gallery;
		}

		public function save_gallery( $post_id ) {
			// check autosave
			if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
				return $post_id;
			}

			// verify nonce
			if ( array_key_exists( FOOGALLERY_CPT_GALLERY . '_nonce', $_POST ) &&
				wp_verify_nonce( $_POST[FOOGALLERY_CPT_GALLERY . '_nonce'], plugin_basename( FOOGALLERY_FILE ) )
			) {
				//if we get here, we are dealing with the Gallery custom post type
				do_action( 'foogallery_before_save_gallery', $post_id, $_POST );

				$attachments = apply_filters( 'foogallery_save_gallery_attachments', explode( ',', $_POST[FOOGALLERY_META_ATTACHMENTS] ), $post_id, $_POST );
				update_post_meta( $post_id, FOOGALLERY_META_ATTACHMENTS, $attachments );

				if ( isset( $_POST[FOOGALLERY_META_TEMPLATE] ) ) {
					$gallery_template = $_POST[FOOGALLERY_META_TEMPLATE];
					update_post_meta( $post_id, FOOGALLERY_META_TEMPLATE, $gallery_template );
				} else {
					$gallery_template = foogallery_default_gallery_template();
				}

				if ( isset( $_POST[FOOGALLERY_META_SETTINGS] ) ) {
					$settings = isset( $_POST[FOOGALLERY_META_SETTINGS] ) ?
						$_POST[FOOGALLERY_META_SETTINGS] : array();
				} else {
					$settings = array();
				}

				$settings = apply_filters( 'foogallery_save_gallery_settings', $settings, $post_id, $_POST );
				$settings = apply_filters( 'foogallery_save_gallery_settings-'. $gallery_template, $settings, $post_id, $_POST );

				update_post_meta( $post_id, FOOGALLERY_META_SETTINGS, $settings );

				if ( isset( $_POST[FOOGALLERY_META_SORT] ) ) {
					update_post_meta( $post_id, FOOGALLERY_META_SORT, $_POST[FOOGALLERY_META_SORT] );
				}

				$custom_css = isset($_POST[FOOGALLERY_META_CUSTOM_CSS]) ?
					$_POST[FOOGALLERY_META_CUSTOM_CSS] : '';

				if ( empty( $custom_css ) ) {
					delete_post_meta( $post_id, FOOGALLERY_META_CUSTOM_CSS );
				} else {
					update_post_meta( $post_id, FOOGALLERY_META_CUSTOM_CSS, $custom_css );
				}

				if ( isset( $_POST[FOOGALLERY_META_RETINA] ) ) {
					update_post_meta( $post_id, FOOGALLERY_META_RETINA, $_POST[FOOGALLERY_META_RETINA] );
				} else {
					delete_post_meta( $post_id, FOOGALLERY_META_RETINA );
				}

				if ( isset( $_POST[FOOGALLERY_META_FORCE_ORIGINAL_THUMBS] ) ) {
					update_post_meta( $post_id, FOOGALLERY_META_FORCE_ORIGINAL_THUMBS, $_POST[FOOGALLERY_META_FORCE_ORIGINAL_THUMBS] );
				} else {
					delete_post_meta( $post_id, FOOGALLERY_META_FORCE_ORIGINAL_THUMBS );
				}

				do_action( 'foogallery_after_save_gallery', $post_id, $_POST );
			}
		}

		public function attach_gallery_to_post( $post_id, $post ) {

			// check autosave
			if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
				return $post_id;
			}

			$allowed_post_types = apply_filters( 'foogallery_allowed_post_types_for_attachment', array( 'post', 'page' ) );

			//only do this check for a page or post
			if ( in_array( $post->post_type, $allowed_post_types ) ) {

                do_action( 'foogallery_start_attach_gallery_to_post', $post_id );

				//Clear any foogallery usages that the post might have
				delete_post_meta( $post_id, FOOGALLERY_META_POST_USAGE );

				//get all foogallery shortcodes that are on the page/post
				$gallery_shortcodes = foogallery_extract_gallery_shortcodes( $post->post_content );

                if ( is_array( $gallery_shortcodes ) && count( $gallery_shortcodes ) > 0 ) {

                    foreach ( $gallery_shortcodes as $id => $shortcode ) {
                        //if the content contains the foogallery shortcode then add a custom field
                        add_post_meta( $post_id, FOOGALLERY_META_POST_USAGE, $id, false );

                        do_action( 'foogallery_attach_gallery_to_post', $post_id, $id );
                    }
                }

                do_action( 'foogallery_attach_gallery_to_post', $post_id, $post );
			}
		}

		public function render_gallery_media_metabox( $post ) {
			$gallery = $this->get_gallery( $post );

			$mode = $gallery->get_meta( 'foogallery_items_view', 'manage' );

			if ( empty($mode) || $gallery->is_new() ) {
				$mode = 'manage';
			}

			wp_enqueue_media();

			?>
			<div class="hidden foogallery-items-view-switch-container">
				<div class="foogallery-items-view-switch">
					<a href="#manage" data-value="manage" data-container=".foogallery-items-view-manage" class="<?php echo $mode==='manage' ? 'current' : ''; ?>"><?php _e('Manage Items', 'foogallery'); ?></a>
					<a href="#preview" data-value="preview" data-container=".foogallery-items-view-preview" class="<?php echo $mode==='preview' ? 'current' : ''; ?>"><?php _e('Gallery Preview', 'foogallery'); ?></a>
				</div>
				<span id="foogallery_preview_spinner" class="spinner"></span>
                <input type="hidden" id="foogallery_items_view_input" value="<?php echo $mode; ?>" name="<?php echo FOOGALLERY_META_SETTINGS . '[foogallery_items_view]'; ?>" />
			</div>

			<div class="foogallery-items-view foogallery-items-view-manage <?php echo $mode==='manage' ? '' : 'hidden'; ?>">
				<input type="hidden" name="<?php echo FOOGALLERY_CPT_GALLERY; ?>_nonce"
					   id="<?php echo FOOGALLERY_CPT_GALLERY; ?>_nonce"
					   value="<?php echo wp_create_nonce( plugin_basename( FOOGALLERY_FILE ) ); ?>"/>
				<input type="hidden" name='foogallery_attachments' id="foogallery_attachments"
					   value="<?php echo $gallery->attachment_id_csv(); ?>"/>
				<div>
					<ul class="foogallery-attachments-list">
					<?php
					if ( $gallery->has_attachments() ) {
						foreach ( $gallery->attachments() as $attachment ) {
							$this->render_gallery_item( $attachment );
						}
					} ?>
						<li class="add-attachment">
							<a href="#" data-uploader-title="<?php _e( 'Add Media To Gallery', 'foogallery' ); ?>"
							   data-uploader-button-text="<?php _e( 'Add Media', 'foogallery' ); ?>"
							   data-post-id="<?php echo $post->ID; ?>" class="upload_image_button"
							   title="<?php _e( 'Add Media To Gallery', 'foogallery' ); ?>">
								<div class="dashicons dashicons-format-gallery"></div>
								<span><?php _e( 'Add Media', 'foogallery' ); ?></span>
							</a>
						</li>
					</ul>
					<div style="clear: both;"></div>
				</div>
				<textarea style="display: none" id="foogallery-attachment-template">
					<?php $this->render_gallery_item(); ?>
				</textarea>
			</div>
			<div class="foogallery-items-view foogallery-items-view-preview <?php echo $mode==='preview' ? '' : 'hidden'; ?>">
				<div class="foogallery_preview_container">
				<?php
				if ( $gallery->has_attachments() ) {
					foogallery_render_gallery( $gallery->ID );
				} else {
					$this->render_empty_gallery_preview();
				}
				?>
				</div>
				<div style="clear: both"></div>
				<?php wp_nonce_field( 'foogallery_preview', 'foogallery_preview', false ); ?>
			</div>
		<?php
		}

		public function render_empty_gallery_preview() {
			echo '<div class="foogallery-preview-empty" style="padding:20px; text-align: center">';
			echo '<h3>' . __( 'Please add media to your gallery to see a preview!', 'foogallery' ) . '</h3>';
			echo '</div>';
		}

		public function render_gallery_item( $attachment_post = false ) {
			if ( $attachment_post != false ) {
				$attachment_id = $attachment_post->ID;
				$attachment = wp_get_attachment_image_src( $attachment_id );
				$extra_class = apply_filters( 'foogallery_admin_render_gallery_item_extra_classes' , '', $attachment_post );
			} else {
				$attachment_id = $attachment = $extra_class = '';
			}

			$data_attribute = empty($attachment_id) ? '' : "data-attachment-id=\"{$attachment_id}\"";
			$img_tag        = empty($attachment) ? '<img width="150" height="150" />' : "<img width=\"150\" height=\"150\" src=\"{$attachment[0]}\" />";
			?>
			<li class="attachment details" <?php echo $data_attribute; ?>>
				<div class="attachment-preview type-image <?php echo $extra_class; ?>">
					<div class="thumbnail">
						<div class="centered">
							<?php echo $img_tag; ?>
						</div>
					</div>
					<a class="info" href="#" title="<?php _e( 'Edit Info', 'foogallery' ); ?>">
						<span class="dashicons dashicons-info"></span>
					</a>
					<a class="remove" href="#" title="<?php _e( 'Remove from gallery', 'foogallery' ); ?>">
						<span class="dashicons dashicons-dismiss"></span>
					</a>
				</div>
				<!--				<input type="text" value="" class="describe" data-setting="caption" placeholder="Caption this image…" />-->
			</li>
		<?php
		}

		public function render_gallery_settings_metabox( $post ) {
            $gallery = $this->get_gallery( $post );

			$gallery = apply_filters( 'foogallery_render_gallery_settings_metabox', $gallery );

            $settings = new FooGallery_Admin_Gallery_MetaBox_Settings_Helper( $gallery );

            $settings->render_hidden_gallery_template_selector();

            $settings->render_gallery_settings();
		}

		public function render_gallery_shortcode_metabox( $post ) {
			$gallery = $this->get_gallery( $post );
			$shortcode = $gallery->shortcode();
			?>
			<p class="foogallery-shortcode">
				<input type="text" id="foogallery_copy_shortcode" size="<?php echo strlen( $shortcode ) + 2; ?>" value="<?php echo htmlspecialchars( $shortcode ); ?>" readonly="readonly" />
			</p>
			<p>
				<?php _e( 'Paste the above shortcode into a post or page to show the gallery.', 'foogallery' ); ?>
			</p>
			<script>
				jQuery(function($) {
					var shortcodeInput = document.querySelector('#foogallery_copy_shortcode');
					shortcodeInput.addEventListener('click', function () {
						try {
							// select the contents
							shortcodeInput.select();
							//copy the selection
							document.execCommand('copy');
							//show the copied message
							$('.foogallery-shortcode-message').remove();
							$(shortcodeInput).after('<p class="foogallery-shortcode-message"><?php _e( 'Shortcode copied to clipboard :)','foogallery' ); ?></p>');
						} catch(err) {
							console.log('Oops, unable to copy!');
						}
					}, false);
				});
			</script>
			<?php
		}

		public function render_gallery_usage_metabox( $post ) {
			$gallery = $this->get_gallery( $post );
			$posts = $gallery->find_usages();
			if ( $posts && count( $posts ) > 0 ) { ?>
				<p>
					<?php _e( 'This gallery is used on the following posts or pages:', 'foogallery' ); ?>
				</p>
				<ul class="ul-disc">
				<?php foreach ( $posts as $post ) {
					$url = get_permalink( $post->ID );
					echo '<li>' . $post->post_title . '&nbsp;';
					edit_post_link( __( 'Edit', 'foogallery' ), '<span class="edit">', ' | </span>', $post->ID );
					echo '<span class="view"><a href="' . esc_url( $url ) . '" target="_blank">' . __( 'View', 'foogallery' ) . '</a></li>';
				} ?>
				</ul>
			<?php } else { ?>
				<p>
					<?php _e( 'This gallery is not used on any pages or pages yet. Quickly create a page:', 'foogallery' ); ?>
				</p>
				<div class="foogallery_metabox_actions">
					<button class="button button-primary button-large" id="foogallery_create_page"><?php _e( 'Create Gallery Page', 'foogallery' ); ?></button>
					<span id="foogallery_create_page_spinner" class="spinner"></span>
					<?php wp_nonce_field( 'foogallery_create_gallery_page', 'foogallery_create_gallery_page_nonce', false ); ?>
				</div>
				<p>
					<?php _e( 'A draft page will be created which includes the gallery shortcode in the content. The title of the page will be the same title as the gallery.', 'foogallery' ); ?>
				</p>
			<?php }
		}

		public function render_sorting_metabox( $post ) {
			$gallery = $this->get_gallery( $post );
			$sorting_options = foogallery_sorting_options();
			if ( empty( $gallery->sorting ) ) {
				$gallery->sorting = '';
			}
			?>
			<p>
				<?php _e('Change the way images are sorted within your gallery. By default, they are sorted in the order you see them.', 'foogallery'); ?>
			</p>
			<?php
			foreach ( $sorting_options as $sorting_key => $sorting_label ) { ?>
				<p>
				<input type="radio" value="<?php echo $sorting_key; ?>" <?php checked( $sorting_key === $gallery->sorting ); ?> id="FooGallerySettings_GallerySort_<?php echo $sorting_key; ?>" name="<?php echo FOOGALLERY_META_SORT; ?>" />
				<label for="FooGallerySettings_GallerySort_<?php echo $sorting_key; ?>"><?php echo $sorting_label; ?></label>
				</p><?php
			} ?>
			<p class="foogallery-help">
				<?php _e('PLEASE NOTE : sorting randomly will force HTML Caching for the gallery to be disabled.', 'foogallery'); ?>
			</p>
			<?php
		}

		public function render_retina_metabox( $post ) {
			$gallery = $this->get_gallery( $post );
			$retina_options = foogallery_retina_options();
			if ( empty( $gallery->retina ) ) {
				$gallery->retina = foogallery_get_setting( 'default_retina_support', array() );

array() is of type array, but the function expects a boolean.

			}
			?>
			<p>
				<?php _e('Add retina support to this gallery by choosing the different pixel densities you want to enable.', 'foogallery'); ?>
			</p>
			<?php
			foreach ( $retina_options as $retina_key => $retina_label ) {
				$checked = array_key_exists( $retina_key, $gallery->retina ) ? ('true' === $gallery->retina[$retina_key]) : false;
				?>
				<p>
				<input type="checkbox" value="true" <?php checked( $checked ); ?> id="FooGallerySettings_Retina_<?php echo $retina_key; ?>" name="<?php echo FOOGALLERY_META_RETINA; ?>[<?php echo $retina_key; ?>]" />
				<label for="FooGallerySettings_Retina_<?php echo $retina_key; ?>"><?php echo $retina_label; ?></label>
				</p><?php
			} ?>
			<p class="foogallery-help">
				<?php _e('PLEASE NOTE : thumbnails will be generated for each of the pixel densities chosen, which will increase your website\'s storage space!', 'foogallery'); ?>
			</p>
			<?php
		}

		public function render_thumb_settings_metabox( $post ) {
			$gallery = $this->get_gallery( $post );

$gallery is not used, you could remove the assignment.

			$force_use_original_thumbs = get_post_meta( $post->ID, FOOGALLERY_META_FORCE_ORIGINAL_THUMBS, true );
			$checked = 'true' === $force_use_original_thumbs; ?>
			<p>
				<?php _e( 'Clear all the previously cached thumbnails that have been generated for this gallery.', 'foogallery' ); ?>
			</p>
			<div class="foogallery_metabox_actions">
				<button class="button button-primary button-large" id="foogallery_clear_thumb_cache"><?php _e( 'Clear Thumbnail Cache', 'foogallery' ); ?></button>
				<span id="foogallery_clear_thumb_cache_spinner" class="spinner"></span>
				<?php wp_nonce_field( 'foogallery_clear_gallery_thumb_cache', 'foogallery_clear_gallery_thumb_cache_nonce', false ); ?>
			</div>
			<p>
				<input type="checkbox" value="true" <?php checked( $checked ); ?> id="FooGallerySettings_ForceOriginalThumbs" name="<?php echo FOOGALLERY_META_FORCE_ORIGINAL_THUMBS; ?>" />
				<label for="FooGallerySettings_ForceOriginalThumbs"><?php _e('Force Original Thumbs', 'foogallery'); ?></label>
			</p>
			<?php
		}

		public function include_required_scripts() {
			$screen_id = foo_current_screen_id();

			//only include scripts if we on the foogallery add/edit page
			if ( FOOGALLERY_CPT_GALLERY === $screen_id ||
			     'edit-' . FOOGALLERY_CPT_GALLERY === $screen_id ) {

				//enqueue any dependencies from extensions or gallery templates
				do_action( 'foogallery_enqueue_preview_dependencies' );
				//add core foogallery files for preview
				foogallery_enqueue_core_gallery_template_style();
				foogallery_enqueue_core_gallery_template_script();

				//spectrum needed for the colorpicker field
				$url = FOOGALLERY_URL . 'lib/spectrum/spectrum.js';
				wp_enqueue_script( 'foogallery-spectrum', $url, array('jquery'), FOOGALLERY_VERSION );
				$url = FOOGALLERY_URL . 'lib/spectrum/spectrum.css';
				wp_enqueue_style( 'foogallery-spectrum', $url, array(), FOOGALLERY_VERSION );

				//make sure we have jquery UI sortable enqueued
				wp_enqueue_script( 'jquery-ui-sortable');

				//include any admin js required for the templates
				foreach ( foogallery_gallery_templates() as $template ) {
					$admin_js = foo_safe_get( $template, 'admin_js' );
					if ( is_array( $admin_js ) ) {
						//dealing with an array of js files to include
						foreach( $admin_js as $admin_js_key => $admin_js_src ) {
							wp_enqueue_script( 'foogallery-gallery-admin-' . $template['slug'] . '-' . $admin_js_key, $admin_js_src, array('jquery', 'media-upload', 'jquery-ui-sortable'), FOOGALLERY_VERSION );
						}
					} else {
						//dealing with a single js file to include
						wp_enqueue_script( 'foogallery-gallery-admin-' . $template['slug'], $admin_js, array('jquery', 'media-upload', 'jquery-ui-sortable'), FOOGALLERY_VERSION );
					}
				}
			}
		}

		public function render_customcss_metabox( $post ) {
			$gallery = $this->get_gallery( $post );
			$custom_css = $gallery->custom_css;
			$example = '<code>#foogallery-gallery-' . $post->ID . ' { }</code>';
			?>
			<p>
				<?php printf( __( 'Add any custom CSS to target this specific gallery. For example %s', 'foogallery' ), $example ); ?>
			</p>
			<table id="table_styling" class="form-table">
				<tbody>
				<tr>
					<td>
						<textarea class="foogallery_metabox_custom_css" name="<?php echo FOOGALLERY_META_CUSTOM_CSS; ?>" type="text"><?php echo $custom_css; ?></textarea>
					</td>
				</tr>
				</tbody>
			</table>
			<?php
		}

		public function ajax_create_gallery_page() {
			if ( check_admin_referer( 'foogallery_create_gallery_page', 'foogallery_create_gallery_page_nonce' ) ) {

				$foogallery_id = $_POST['foogallery_id'];

				$foogallery = FooGallery::get_by_id( $foogallery_id );

				$post = array(
					'post_content' => $foogallery->shortcode(),
					'post_title'   => $foogallery->name,
					'post_status'  => 'draft',
					'post_type'    => 'page',
				);

				wp_insert_post( $post );
			}
			die();
		}

		public function ajax_clear_gallery_thumb_cache() {
			if ( check_admin_referer( 'foogallery_clear_gallery_thumb_cache', 'foogallery_clear_gallery_thumb_cache_nonce' ) ) {

				$foogallery_id = $_POST['foogallery_id'];

				$foogallery = FooGallery::get_by_id( $foogallery_id );

				ob_start();

				//loop through all images, get the full sized file
				foreach ( $foogallery->attachments() as $attachment ) {
					$meta_data = wp_get_attachment_metadata( $attachment->ID );

					$file = $meta_data['file'];

					wpthumb_delete_cache_for_file( $file );
				}

				ob_end_clean();

				echo __( 'The thumbnail cache has been cleared!', 'foogallery' );
			}

			die();
		}

		public function ajax_gallery_preview() {
			if ( check_admin_referer( 'foogallery_preview', 'foogallery_preview_nonce' ) ) {

				$foogallery_id = $_POST['foogallery_id'];

				$template = $_POST['foogallery_template'];

				//check that the template supports previews
				$gallery_template = foogallery_get_gallery_template( $template );
				if ( isset( $gallery_template['preview_support'] ) && true === $gallery_template['preview_support'] ) {

					global $foogallery_gallery_preview;

Use of global functionality is not recommended; it makes your code harder to test, and less reusable.

					$foogallery_gallery_preview = true;

					$args = array(
						'template'       => $template,
						'attachment_ids' => $_POST['foogallery_attachments'],
                        'preview'        => true
					);

					$args = apply_filters( 'foogallery_preview_arguments', $args, $_POST, $template );
					$args = apply_filters( 'foogallery_preview_arguments-' . $template, $args, $_POST );

					foogallery_render_gallery( $foogallery_id, $args );

					$foogallery_gallery_preview = false;

				} else {
					echo '<div style="padding:20px 50px 50px 50px; text-align: center">';
					echo '<h3>' . __( 'Preview not available!', 'foogallery' ) . '</h3>';
					echo __('Sorry, but this gallery template does not support live previews. Please update the gallery in order to see what the gallery will look like.', 'foogallery' );
					echo '</div>';
				}
			}

			die();
		}

		/**
		 * Handle gallery previews where there are no attachments
		 *
		 * @param $foogallery FooGallery
		 */
		public function preview_no_attachments( $foogallery ) {

The parameter $foogallery is not used and could be removed.

			global $foogallery_gallery_preview;

Use of global functionality is not recommended; it makes your code harder to test, and less reusable.

			if ( isset( $foogallery_gallery_preview ) && true === $foogallery_gallery_preview ) {
				$this->render_empty_gallery_preview();
			}
		}
	}
}