featured-image-column / featured-image-column.php

featured-image-column.php in Featured Image Column 0.1.6, at featured-image-column.php

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1	<?php
2	/**
3	* Plugin Name: Featured Image Column
4	* Plugin URI: http://austinpassy.com/wordpress-plugins/featured-image-column
5	* Description: Adds a column to the edit screen with the featured image if it exists.
6	* Version: 0.1.6
7	* Author: Austin Passy
8	* Author URI: http://austinpassy.com
9	*
10	* @copyright 2009 - 2011
11	* @author Austin Passy
12	* @link http://frostywebdesigns.com/
13	* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
14	*
15	* This program is distributed in the hope that it will be useful,
16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
18	*
19	* @package Featured_Image_Column
20	*/
21
22	if ( !class_exists( 'Featured_Image_Column' ) ) {
23	class Featured_Image_Column {
24
25	const domain = 'featured-image-column';
26	const version = '0.1.6';
27
28	/**
29	* Ensures that the rest of the code only runs on edit.php pages
30	*
31	* @since 0.1
32	*/
33	function __construct() {
34	add_action( 'load-edit.php', array( __CLASS__, 'load' ) );
35	}
36
37	/**
38	* Since the load-edit.php hook is too early for checking the post type, hook the rest
39	* of the code to the wp action to allow the query to be run first
40	*
41	* @since 0.1.6
42	*/
43	function load() {
44	add_action( 'wp', array( __CLASS__, 'init' ) );
45	}
46
47	/**
48	* Sets up the Featured_Image_Column plugin and loads files at the appropriate time.
49	*
50	* @since 0.1.6
51	*/
52	function init() {
53	$post_type = get_post_type();
54
55	if ( !post_type_supports( $post_type, 'thumbnail' ) )
56	return;
57
58	/* Print style */
59	add_action( 'admin_print_styles', array( __CLASS__, 'style' ), 0 );
60
61	/* Column manager */
62	add_filter( "manage_{$post_type}_posts_columns", array( __CLASS__, 'columns' ) );
63	add_action( "manage_{$post_type}_posts_custom_column", array( __CLASS__, 'column_data' ), 10, 2 );
64
65	do_action( 'featured_image_column_loaded' );
66	}
67
68	/**
69	* Enqueue stylesheaet
70	* @since 0.1
71	*/
72	function style() {
73	wp_enqueue_style( 'featured-image-column', plugin_dir_url( __FILE__ ) . 'css/column.css', null, self::version );
74	}
75
76	/**
77	* Filter the image in before the 'title'
78	*/
79	function columns( $columns ) {
80	if ( !is_array( $columns ) )
81	$columns = array();
82
83	$new = array();
84
85	foreach( $columns as $key => $title ) {
86	if ( $key == 'title' ) // Put the Thumbnail column before the Title column
87	$new['featured-image'] = __( 'Image', self::domain );
88
89	$new[$key] = $title;
90	}
91
92	return $new;
93	}
94
95	/**
96	* Output the image
97	*/
98	function column_data( $column_name, $post_id ) {
99	if ( 'featured-image' != $column_name )
100	return;
101
102	$image_src = self::get_the_image( $post_id );
103
104	if ( empty( $image_src ) ) {
105	echo " "; // This helps prevent issues with empty cells
106	return;
107	}
108
109	echo '<img alt="' . esc_attr( get_the_title() ) . '" src="' . esc_url( $image_src ) . '" />';
110	}
111
112	/**
113	* Function to get the image
114	*
115	* @since 0.1
116	* @updated 0.1.3 - Added wp_cache_set()
117	*/
118	function get_the_image( $post_id ) {
119	$image = wp_cache_get( 'featured_column_thumbnail', 'post' );
120
121	if ( empty( $image) \|\| !is_string( $image ) ) {
122	$image = '';
123
124	if ( has_post_thumbnail( $post_id ) ) {
125	$image_array = wp_get_attachment_image_src( get_post_thumbnail_id( $post_id ), array( 36, 32 ) );
126
127	if ( is_array( $image_array ) && is_string( $image_array[0] ) )
128	$image = $image_array[0];
129	}
130
131	if ( empty( $image ) ) {
132	$image = plugins_url( 'images/default.png', __FILE__ );
133	$image = apply_filters( 'featured_image_column_default_image', $image );
134	}
135
136	$image = esc_url( $image );
137
138	wp_cache_set( 'featured_column_thumbnail', $image, 'post', 60 * 60 * 24 /* 24 hours */ );
139	}
140
141	return $image;
142	}
143	}
144	$featured_image_column = new Featured_Image_Column();
145	};
146
147	?>