WordPress: un widget per mostrare le miniature di una galleria di foto nella sidebar

<?php
 
/*
 * ms_gallery_thumbs.php
 * 
 * Copyright 2016 Mario Spada <spadamar@spadamar.com>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 * 
 * 
 */
 
class ms_gallery_thumbs extends WP_Widget {
 
	protected $imgShapeOpts = array('square','circle','rounded corner');
 
	function __construct() {
		parent::__construct(
		'ms_gallery_thumbs', 
		__('MS Gallery Thumbs Widget', 'ms_gallery_thumbs_domain'), 
		array( 'description' => __( 'This widget displays an array of thumbnails 64x64 from a given post ID with one or more galleries attached', 'ms_gallery_thumbs_domain' ), ) 
		);
	}
 
	// Front-end
	public function widget( $args, $instance ) {
		$title = apply_filters( 'widget_title', $instance['title'] );
		echo $args['before_widget'];
		if ( ! empty( $title ) )
		echo $args['before_title'] . $title . $args['after_title'];
 
		echo $this->_outHtml($instance[ 'postID' ],$instance[ 'imgNums' ],$instance[ 'fullImgSize' ],$instance[ 'imgShape' ]);
		echo $args['after_widget'];
	}
 
	// Widget Backend 
	public function form( $instance ) {
			if ( isset( $instance[ 'title' ] ) ) {
				$title = $instance[ 'title' ];
			} else {
				$title = __( 'New title', 'ms_gallery_thumbs_domain' );
			}
			if ( isset( $instance[ 'postID' ] ) ) {
				$postID = (int) $instance[ 'postID' ];
			} else {
				$postID = 1;
			}
			if ( isset( $instance[ 'imgNums' ] ) ) {
				$imgNums = (int) $instance[ 'imgNums' ];
			} else {
				$imgNums = 100;
			}		
			if ( isset( $instance[ 'fullImgSize' ] ) ) {
				$fullImgSize = (int) $instance[ 'fullImgSize' ];
			} else {
				$fullImgSize = 0;
			}
			$imgShapeOpts = array('square','circle','rounded corner');
			if ( isset( $instance[ 'imgShape' ] ) ) {
				$imgShape = esc_attr( $instance[ 'imgShape' ] );
			} else {
				$imgShape = $this->imgShapeOpts[0];
			}
 
		// Widget admin form
		?>
		<p><label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label> 
		<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></p>
		<p><label for="<?php echo $this->get_field_id( 'postID' ); ?>"><?php _e( 'Post ID:' ); ?></label> 
		<input class="widefat" id="<?php echo $this->get_field_id( 'postID' ); ?>" name="<?php echo $this->get_field_name( 'postID' ); ?>" type="text" value="<?php echo esc_attr( $postID ); ?>" /></p>
		<p><label for="<?php echo $this->get_field_id( 'imgNums' ); ?>"><?php _e( 'Image number:' ); ?></label> 
		<input class="widefat" id="<?php echo $this->get_field_id( 'imgNums' ); ?>" name="<?php echo $this->get_field_name( 'imgNums' ); ?>" type="text" value="<?php echo esc_attr( $imgNums ); ?>" /></p>
 
		<p><label for="<?php echo $this->get_field_id( 'fullImgSize' ); ?>"><?php _e( 'Linked image size:' ); ?></label> 
		<select class="widefat" id="<?php echo $this->get_field_id( 'fullImgSize' ); ?>" name="<?php echo $this->get_field_name( 'fullImgSize' ); ?>">
		<?php 	
			if ( $fullImgSize ) {
				$sel1 = "";
				$sel2 = "selected";
			} else {
				$sel1 = "selected";
				$sel2 = "";
			}
		?>
		<option value='0' <?php echo $sel1; ?>>Gallery size</option><option  value='1' <?php echo $sel2; ?>>Full size</option></select></p>
 
		<p><label for="<?php echo $this->get_field_id( 'imgShape' ); ?>"><?php _e( 'Thumbnail shape:' ); ?></label>
		<select class="widefat" id="<?php echo $this->get_field_id( 'imgShape' ); ?>" name="<?php echo $this->get_field_name( 'imgShape' ); ?>">
		<?php
			foreach($this->imgShapeOpts as $opt) {
				$selected = $opt == $imgShape ? "selected" : "";
				echo "<option {$selected}>{$opt}</option>";
			}
		?>		
		</select></p>
 
		<?php 
	}
 
	public function update( $new_instance, $old_instance ) {
		$instance = array();
		$instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';
		$instance['postID'] = ( ! empty( $new_instance['postID'] ) ) ? intval( $new_instance['postID'] ) : 1;
		$instance['imgNums'] = ( ! empty( $new_instance['imgNums'] ) ) ? intval( $new_instance['imgNums'] ) : 100;
		$instance['fullImgSize'] = ( isset( $new_instance['fullImgSize'] ) ) ? intval( $new_instance['fullImgSize'] ) : 0;
		$instance['imgShape'] = ( isset( $new_instance['imgShape'] ) ) ? esc_attr( $new_instance['imgShape'] ) : $this->imgShapeOpts[0];
		return $instance;
	}
 
	private function _get_thumb_info($file_name) {
			if (empty($file_name)) 
				return array();
			$relpathimg = parse_url($file_name, PHP_URL_PATH);
			$ext = pathinfo($relpathimg, PATHINFO_EXTENSION);
			$name = pathinfo($relpathimg, PATHINFO_FILENAME);
			$path = pathinfo($relpathimg, PATHINFO_DIRNAME);	
			$size = substr(strrchr($name,'-'),1);
			$oname = substr($name,0,-strlen($size)-1);	
		return array("ext" => $ext, "name" => $name, "path" => $path, "orig-name" => $oname);
	}
 
	private function _outHtml($id,$imgnum=100,$fullSize=0,$imgShape) {
		if ($imgShape == $this->imgShapeOpts[0]) {
			$cssThumbImg = 'border-radius:0%';
		} elseif($imgShape ==$this->imgShapeOpts[1]) {
			$cssThumbImg = 'border-radius:50%';
		} else {
			$cssThumbImg = 'border-radius:15%';
		}
		$thumbPostName = "-150x150";
		$i = 1;
		$html = "";
		$galleries = get_post_galleries_images( $id ); 
		$html .=  "<div class='ms-gallery-thumbs' style='display:block'>n";
		foreach($galleries as $key => $imgs){
			foreach($imgs as $img){
				if ($i <= $imgnum) {
					$r = $this->_get_thumb_info($img);
					$filename = $r['path']."/".$r['orig-name'].$thumbPostName.".".$r['ext'];
					$fullSizeFilename = $fullSize ?  $r['path']."/".$r['orig-name'].".".$r['ext'] : $r['path']."/".$r['name'].".".$r['ext'];
					if (file_exists($_SERVER["DOCUMENT_ROOT"].$filename)) {
						$html .=   "<a rel='lightbox[gallery".$id."]' href='".$fullSizeFilename."'><img src='".$filename."' style='height:64px;width:64px;float:left;margin:5px;{$cssThumbImg};overflow:hidden;'></a>n";
						$i++;
					}
				}
			}
		}
		$html .=  "</div>";
 
		return $html; 
	}
 
} // End Class
 
// Register and load the widget
function ms_gallery_thumbs_load_widget() {
	register_widget( 'ms_gallery_thumbs' );
}
add_action( 'widgets_init', 'ms_gallery_thumbs_load_widget' );
 
?>