| 1 |
<?php |
| 2 |
|
| 3 |
// Retrieved from this blog post: http://w-shadow.com/blog/2010/06/29/adding-stuff-to-wordpress-screen-options/ |
| 4 |
|
| 5 |
if ( ! class_exists( 'wsScreenOptions10' ) ) : |
| 6 |
|
| 7 |
/** |
| 8 |
* Class for adding new panels to the "Screen Options" box. |
| 9 |
* |
| 10 |
* Do not access this class directly. Instead, use the add_screen_options_panel() function. |
| 11 |
* |
| 12 |
* @author Janis Elsts |
| 13 |
* @copyright 2010 |
| 14 |
* @version 1.0 |
| 15 |
* @access public |
| 16 |
*/ |
| 17 |
class wsScreenOptions10 { |
| 18 |
public $registered_panels; // List of custom "Screen Options" panels |
| 19 |
public $page_panels; // Index of panels registered for each page ($page => array of panel ids). |
| 20 |
|
| 21 |
/** |
| 22 |
* Class constructor |
| 23 |
* |
| 24 |
* @return void |
| 25 |
*/ |
| 26 |
public function __construct() { |
| 27 |
$this->registered_panels = array(); |
| 28 |
$this->page_panels = array(); |
| 29 |
|
| 30 |
add_filter( 'screen_settings', array( $this, 'append_screen_settings' ), 10, 2 ); |
| 31 |
add_action( 'admin_print_scripts', array( $this, 'add_autosave_script' ) ); |
| 32 |
} |
| 33 |
|
| 34 |
/** |
| 35 |
* Add a new settings panel to the "Screen Options" box. |
| 36 |
* |
| 37 |
* @param string $id String to use in the 'id' attribute of the settings panel. Should be unique. |
| 38 |
* @param string $title Title of the settings panel. Set to an empty string to omit title. |
| 39 |
* @param callback $callback Function that fills the panel with the desired content. Should return its output. |
| 40 |
* @param string|array $page The page(s) on which to show the panel (similar to add_meta_box()). |
| 41 |
* @param callback $save_callback Optional. Function that saves the settings. |
| 42 |
* @param bool $autosave Optional. If se, settings will be automatically saved (via AJAX) when the value of any input element in the panel changes. Defaults to false. |
| 43 |
* @return void |
| 44 |
*/ |
| 45 |
public function add_screen_options_panel( $id, $title, $callback, $page, $save_callback = null, $autosave = false ) { |
| 46 |
if ( ! is_array( $page ) ) { |
| 47 |
$page = array( $page ); |
| 48 |
} |
| 49 |
// Convert page hooks/slugs to screen IDs |
| 50 |
$page = array_map( array( $this, 'page_to_screen_id' ), $page ); |
| 51 |
$page = array_unique( $page ); |
| 52 |
|
| 53 |
$new_panel = array( |
| 54 |
'title' => $title, |
| 55 |
'callback' => $callback, |
| 56 |
'page' => $page, |
| 57 |
'save_callback' => $save_callback, |
| 58 |
'autosave' => $autosave, |
| 59 |
); |
| 60 |
|
| 61 |
if ( $save_callback ) { |
| 62 |
add_action( 'wp_ajax_save_settings-' . $id, array( $this, 'ajax_save_callback' ) ); |
| 63 |
} |
| 64 |
|
| 65 |
// Store the panel ID in each relevant page's list |
| 66 |
foreach ( $page as $page_id ) { |
| 67 |
if ( ! isset( $this->page_panels[ $page_id ] ) ) { |
| 68 |
$this->page_panels[ $page_id ] = array(); |
| 69 |
} |
| 70 |
$this->page_panels[ $page_id ][] = $id; |
| 71 |
} |
| 72 |
|
| 73 |
$this->registered_panels[ $id ] = $new_panel; |
| 74 |
} |
| 75 |
|
| 76 |
/** |
| 77 |
* Convert a page hook name to a screen ID. |
| 78 |
* |
| 79 |
* @uses convert_to_screen() |
| 80 |
* @access private |
| 81 |
* |
| 82 |
* @param string $page |
| 83 |
* @return string |
| 84 |
*/ |
| 85 |
public function page_to_screen_id( $page ) { |
| 86 |
if ( function_exists( 'convert_to_screen' ) ) { |
| 87 |
$screen = convert_to_screen( $page ); |
| 88 |
if ( isset( $screen->id ) ) { |
| 89 |
return $screen->id; |
| 90 |
} else { |
| 91 |
return ''; |
| 92 |
} |
| 93 |
} else { |
| 94 |
return str_replace( array( '.php', '-new', '-add' ), '', $page ); |
| 95 |
} |
| 96 |
} |
| 97 |
|
| 98 |
/** |
| 99 |
* Append custom panel HTML to the "Screen Options" box of the current page. |
| 100 |
* Callback for the 'screen_settings' filter (available in WP 3.0 and up). |
| 101 |
* |
| 102 |
* @access private |
| 103 |
* |
| 104 |
* @param string $current |
| 105 |
* @param string $screen Screen object (undocumented). |
| 106 |
* @return string The HTML code to append to "Screen Options" |
| 107 |
*/ |
| 108 |
public function append_screen_settings( $current, $screen ) { |
| 109 |
global $hook_suffix; |
| 110 |
|
| 111 |
// Sanity check |
| 112 |
if ( ! isset( $screen->id ) ) { |
| 113 |
return $current; |
| 114 |
} |
| 115 |
|
| 116 |
// Are there any panels that want to appear on this page? |
| 117 |
$panels = $this->get_panels_for_screen( $screen->id, $hook_suffix ); |
| 118 |
if ( empty( $panels ) ) { |
| 119 |
return $current; |
| 120 |
} |
| 121 |
|
| 122 |
// Append all panels registered for this screen |
| 123 |
foreach ( $panels as $panel_id ) { |
| 124 |
$panel = $this->registered_panels[ $panel_id ]; |
| 125 |
|
| 126 |
// Add panel title |
| 127 |
if ( ! empty( $panel['title'] ) ) { |
| 128 |
$current .= "\n<h5>" . $panel['title'] . "</h5>\n"; |
| 129 |
} |
| 130 |
// Generate panel contents |
| 131 |
if ( is_callable( $panel['callback'] ) ) { |
| 132 |
$contents = call_user_func( $panel['callback'] ); |
| 133 |
$classes = array( |
| 134 |
'metabox-prefs', |
| 135 |
'custom-options-panel', |
| 136 |
); |
| 137 |
if ( $panel['autosave'] ) { |
| 138 |
$classes[] = 'requires-autosave'; |
| 139 |
} |
| 140 |
|
| 141 |
$contents = sprintf( |
| 142 |
'<div id="%s" class="%s"><input type="hidden" name="_wpnonce-%s" value="%s" />%s</div>', |
| 143 |
esc_attr( $panel_id ), |
| 144 |
implode( ' ', $classes ), |
| 145 |
esc_attr( $panel_id ), |
| 146 |
wp_create_nonce( 'save_settings-' . $panel_id ), |
| 147 |
$contents |
| 148 |
); |
| 149 |
|
| 150 |
$current .= $contents; |
| 151 |
} |
| 152 |
} |
| 153 |
|
| 154 |
return $current; |
| 155 |
} |
| 156 |
|
| 157 |
/** |
| 158 |
* AJAX callback for the "Screen Options" autosave. |
| 159 |
* |
| 160 |
* @access private |
| 161 |
* @return void |
| 162 |
*/ |
| 163 |
public function ajax_save_callback() { |
| 164 |
if ( empty( $_POST['action'] ) ) { |
| 165 |
wp_die( '0' ); |
| 166 |
} |
| 167 |
|
| 168 |
// The 'action' argument is in the form "save_settings-panel_id" |
| 169 |
// phpcs:ignore WordPress.Security.NonceVerification.Missing -- it's being verified 2 lines down |
| 170 |
$ids = explode( '-', $_POST['action'], 2 ); |
| 171 |
$id = end( $ids ); |
| 172 |
|
| 173 |
// Basic security check. |
| 174 |
check_ajax_referer( 'save_settings-' . $id, '_wpnonce-' . $id ); |
| 175 |
|
| 176 |
// Hand the request to the registered callback, if any |
| 177 |
if ( ! isset( $this->registered_panels[ $id ] ) ) { |
| 178 |
wp_die( '0' ); |
| 179 |
} |
| 180 |
$panel = $this->registered_panels[ $id ]; |
| 181 |
if ( is_callable( $panel['save_callback'] ) ) { |
| 182 |
call_user_func( $panel['save_callback'], $_POST ); |
| 183 |
wp_die( '1' ); |
| 184 |
} else { |
| 185 |
wp_die( '0' ); |
| 186 |
} |
| 187 |
} |
| 188 |
|
| 189 |
/** |
| 190 |
* Add/enqueue supporting JavaScript for the autosave function of custom "Screen Options" panels. |
| 191 |
* |
| 192 |
* Checks if the current page is supposed to contain any autosave-enabled |
| 193 |
* panels and adds the script only if that's the case. |
| 194 |
* |
| 195 |
* @return void |
| 196 |
*/ |
| 197 |
public function add_autosave_script() { |
| 198 |
// Get the page id/hook/slug/whatever. |
| 199 |
global $hook_suffix; |
| 200 |
|
| 201 |
// Check if we have some panels with autosave registered for this page. |
| 202 |
$panels = $this->get_panels_for_screen( '', $hook_suffix ); |
| 203 |
if ( empty( $panels ) ) { |
| 204 |
return; |
| 205 |
} |
| 206 |
|
| 207 |
$got_autosave = false; |
| 208 |
foreach ( $panels as $panel_id ) { |
| 209 |
if ( $this->registered_panels[ $panel_id ]['autosave'] ) { |
| 210 |
$got_autosave = true; |
| 211 |
break; |
| 212 |
} |
| 213 |
} |
| 214 |
|
| 215 |
if ( $got_autosave ) { |
| 216 |
// Enqueue the script itself |
| 217 |
$url = EDIT_FLOW_URL . '/common/js/screen-options.js'; |
| 218 |
wp_enqueue_script( 'screen-options-custom-autosave', $url, array( 'jquery' ), EDIT_FLOW_VERSION ); |
| 219 |
} |
| 220 |
} |
| 221 |
|
| 222 |
/** |
| 223 |
* Get custom panels registered for a particular screen and/or page. |
| 224 |
* |
| 225 |
* @param string $screen_id Screen ID. |
| 226 |
* @param string $page Optional. Page filename or hook name. |
| 227 |
* @return array Array of custom panels. |
| 228 |
*/ |
| 229 |
public function get_panels_for_screen( $screen_id, $page = '' ) { |
| 230 |
if ( isset( $this->page_panels[ $screen_id ] ) && ! empty( $this->page_panels[ $screen_id ] ) ) { |
| 231 |
$panels = $this->page_panels[ $screen_id ]; |
| 232 |
} else { |
| 233 |
$panels = array(); |
| 234 |
} |
| 235 |
if ( ! empty( $page ) ) { |
| 236 |
$page_as_screen = $this->page_to_screen_id( $page ); |
| 237 |
if ( isset( $this->page_panels[ $page_as_screen ] ) && ! empty( $this->page_panels[ $page_as_screen ] ) ) { |
| 238 |
$panels = array_merge( $panels, $this->page_panels[ $page_as_screen ] ); |
| 239 |
} |
| 240 |
} |
| 241 |
return array_unique( $panels ); |
| 242 |
} |
| 243 |
} |
| 244 |
|
| 245 |
// All versions of the class are stored in a global array |
| 246 |
// and only the latest version is actually used. |
| 247 |
global $ws_screen_options_versions; |
| 248 |
if ( ! isset( $ws_screen_options_versions ) ) { |
| 249 |
$ws_screen_options_versions = array(); |
| 250 |
} |
| 251 |
$ws_screen_options_versions['1.0'] = 'wsScreenOptions10'; |
| 252 |
endif; |
| 253 |
|
| 254 |
if ( ! function_exists( 'add_screen_options_panel' ) ) { |
| 255 |
|
| 256 |
/** |
| 257 |
* Add a new settings panel to the "Screen Options" box. |
| 258 |
* |
| 259 |
* @see wsScreenOptions10::add_screen_options_panel() |
| 260 |
* |
| 261 |
* @param string $id String to use in the 'id' attribute of the settings panel. Should be unique. |
| 262 |
* @param string $title Title of the settings panel. Set to an empty string to omit title. |
| 263 |
* @param callback $callback Function that fills the panel with the desired content. Should return its output. |
| 264 |
* @param string|array $page The page(s) on which to show the panel (similar to add_meta_box()). |
| 265 |
* @param callback $save_callback Optional. Function that saves the settings contained in the panel. |
| 266 |
* @param bool $autosave Optional. If set, settings will be automatically saved (via AJAX) when the value of any input element in the panel changes. Defaults to false. |
| 267 |
* @return void |
| 268 |
*/ |
| 269 |
function add_screen_options_panel( $id, $title, $callback, $page, $save_callback = null, $autosave = false ) { |
| 270 |
global $ws_screen_options_versions; |
| 271 |
|
| 272 |
static $instance = null; |
| 273 |
if ( is_null( $instance ) ) { |
| 274 |
// Instantiate the latest version of the wsScreenOptions class |
| 275 |
uksort( $ws_screen_options_versions, 'version_compare' ); |
| 276 |
$class_name = end( $ws_screen_options_versions ); |
| 277 |
$instance = new $class_name(); |
| 278 |
} |
| 279 |
|
| 280 |
return $instance->add_screen_options_panel( $id, $title, $callback, $page, $save_callback, $autosave ); |
| 281 |
} |
| 282 |
|
| 283 |
} |
| 284 |
|
