display-featured-image-genesis/includes/class-displayfeaturedimagegenesis-admin.php

<?php

/**
 * Dependent class to establish/display columns for featured images
 *
 * @package   DisplayFeaturedImageGenesis
 * @author    Robin Cornett <hello@robincornett.com>
 * @license   GPL-2.0+
 * @link      http://robincornett.com
 * @copyright 2015 Robin Cornett Creative, LLC
 * @since 2.0.0
 */

class Display_Featured_Image_Genesis_Admin {

	public function __construct( $common ) {
		$this->common = $common;
	}

	public function set_up_columns() {
		$this->set_up_taxonomy_columns();
		$this->set_up_post_type_columns();

		add_action( 'admin_enqueue_scripts', array( $this, 'featured_image_column_width' ) );
	}

	/**
	 * set up new column for all public taxonomies
	 *
	 * @since  2.0.0
	 */
	public function set_up_taxonomy_columns() {
		$args       = array(
			'public' => true,
		);
		$output     = 'names';
		$taxonomies = get_taxonomies( $args, $output );
		foreach ( $taxonomies as $taxonomy ) {
			add_filter( "manage_edit-{$taxonomy}_columns", array( $this, 'add_column' ) );
			add_action( "manage_{$taxonomy}_custom_column", array( $this, 'manage_taxonomy_column' ), 10, 3 );
		}
	}

	/**
	 * set up new column for all public post types
	 *
	 * @since  2.0.0
	 */
	public function set_up_post_type_columns() {
		$args       = array(
			'public'   => true,
			'_builtin' => false,
		);
		$output     = 'names';
		$post_types = get_post_types( $args, $output );
		$post_types['post'] = 'post';
		$post_types['page'] = 'page';
		foreach ( $post_types as $post_type ) {
			if ( ! post_type_supports( $post_type, 'thumbnail' ) ) {
				return;
			}
			add_filter( "manage_edit-{$post_type}_columns", array( $this, 'add_column' ) );
			add_action( "manage_{$post_type}_posts_custom_column", array( $this, 'custom_post_columns' ), 10, 2 );
		}
	}

	/**
	 * add featured image column
	 * @param column $columns set up new column to show featured image for taxonomies/posts/etc.
	 *
	 * @since 2.0.0
	 */
	public function add_column( $columns ) {

		$new_columns = $columns;
		array_splice( $new_columns, 1 );

		$new_columns['featured_image'] = __( 'Featured Image', 'display-featured-image-genesis' );

		return array_merge( $new_columns, $columns );

	}

	/**
	 * manage new taxonomy column
	 * @param  blank $value   blank (because WP)
	 * @param  column id $column  column id is featured_image
	 * @param  term id $term_id term_id for taxonomy
	 * @return featured image          display featured image, if it exists, for each term in a public taxonomy
	 *
	 * @since 2.0.0
	 */
	public function manage_taxonomy_column( $value, $column, $term_id ) {

		if ( 'featured_image' !== $column ) {
			return;
		}

		$term_meta = get_option( "displayfeaturedimagegenesis_$term_id" );

		if ( empty( $term_meta['term_image'] ) ) {
			return;
		}

		$taxonomy = filter_input( INPUT_POST, 'taxonomy', FILTER_SANITIZE_STRING );
		$taxonomy = ! is_null( $taxonomy ) ? $taxonomy : get_current_screen()->taxonomy;
		$alt      = get_term( $term_id, $taxonomy )->name;
		$id       = is_numeric( $term_meta['term_image'] ) ? $term_meta['term_image'] : $this->common->get_image_id( $term_meta['term_image'] );

		$preview = apply_filters(
			'display_featured_image_genesis_admin_term_thumbnail',
			wp_get_attachment_image_src( $id, 'thumbnail' ),
			$id
		);

		printf( '<img src="%1$s" alt="%2$s" />',
			esc_url( $preview[0] ),
			esc_attr( $alt )
		);

	}

	/**
	 * manage new post_type column
	 * @param  column id $column  column id is featured_image
	 * @param  post id $post_id id of each post
	 * @return featured image          display featured image, if it exists, for each post
	 *
	 * @since 2.0.0
	 */
	public function custom_post_columns( $column, $post_id ) {

		if ( 'featured_image' !== $column ) {
			return;
		}

		$id = get_post_thumbnail_id( $post_id );
		if ( ! $id ) {
			return;
		}

		$preview = apply_filters(
			'display_featured_image_genesis_admin_post_thumbnail',
			wp_get_attachment_image_src( $id, 'thumbnail' ),
			$id
		);
		printf( '<img src="%1$s" alt="%2$s" />',
			esc_url( $preview[0] ),
			esc_attr( the_title_attribute( 'echo=0' ) )
		);

	}

	/**
	 * sets a width for the featured image column
	 * @return stylesheet inline stylesheet to set featured image column width
	 */
	public function featured_image_column_width() {
		$screen = get_current_screen();
		if ( in_array( $screen->base, array( 'edit', 'edit-tags' ) ) ) { ?>
			<style type="text/css">
				.column-featured_image { width: 105px; }
				.column-featured_image img { margin: 0 auto; display: block; height: auto; width: auto; max-width: 60px; max-height: 80px; }
			</style> <?php
		}
	}

}