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<?php |
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|
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// Retrieved from this blog post: http://w-shadow.com/blog/2010/06/29/adding-stuff-to-wordpress-screen-options/ |
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|
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if ( !class_exists('wsScreenOptions10') ): |
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|
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/** |
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* Class for adding new panels to the "Screen Options" box. |
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* |
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* Do not access this class directly. Instead, use the add_screen_options_panel() function. |
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* |
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* @author Janis Elsts |
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* @copyright 2010 |
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* @version 1.0 |
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* @access public |
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*/ |
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class wsScreenOptions10 { |
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var $registered_panels; //List of custom "Screen Options" panels |
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var $page_panels; //Index of panels registered for each page ($page => array of panel ids). |
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|
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/** |
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* Class constructor |
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* |
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* @return void |
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*/ |
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function wsScreenOptions10(){ |
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$this->registered_panels = array(); |
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$this->page_panels = array(); |
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|
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add_filter('screen_settings', array( $this, 'append_screen_settings' ), 10, 2); |
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add_action('admin_print_scripts', array( $this, 'add_autosave_script' ) ); |
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} |
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|
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/** |
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* Add a new settings panel to the "Screen Options" box. |
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* |
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* @param string $id String to use in the 'id' attribute of the settings panel. Should be unique. |
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* @param string $title Title of the settings panel. Set to an empty string to omit title. |
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* @param callback $callback Function that fills the panel with the desired content. Should return its output. |
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* @param string|array $page The page(s) on which to show the panel (similar to add_meta_box()). |
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* @param callback $save_callback Optional. Function that saves the settings. |
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* @param bool $autosave Optional. If se, settings will be automatically saved (via AJAX) when the value of any input element in the panel changes. Defaults to false. |
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* @return void |
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*/ |
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function add_screen_options_panel($id, $title, $callback, $page, $save_callback = null, $autosave = false){ |
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if ( !is_array($page) ){ |
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$page = array($page); |
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} |
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//Convert page hooks/slugs to screen IDs |
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$page = array_map( array( $this, 'page_to_screen_id' ), $page); |
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$page = array_unique($page); |
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|
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$new_panel = array( |
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'title' => $title, |
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'callback' => $callback, |
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'page' => $page, |
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'save_callback' => $save_callback, |
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'autosave' => $autosave, |
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); |
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|
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if ( $save_callback ){ |
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add_action('wp_ajax_save_settings-' . $id, array( $this, 'ajax_save_callback' ) ); |
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} |
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|
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//Store the panel ID in each relevant page's list |
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foreach($page as $page_id){ |
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if ( !isset($this->page_panels[$page_id]) ){ |
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$this->page_panels[$page_id] = array(); |
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} |
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$this->page_panels[$page_id][] = $id; |
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} |
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|
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$this->registered_panels[$id] = $new_panel; |
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} |
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|
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/** |
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* Convert a page hook name to a screen ID. |
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* |
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* @uses convert_to_screen() |
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* @access private |
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* |
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* @param string $page |
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* @return string |
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*/ |
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function page_to_screen_id($page){ |
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if ( function_exists('convert_to_screen') ){ |
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$screen = convert_to_screen($page); |
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if ( isset($screen->id) ){ |
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return $screen->id; |
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} else { |
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return ''; |
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} |
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} else { |
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return str_replace( array('.php', '-new', '-add' ), '', $page); |
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} |
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} |
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|
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/** |
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* Append custom panel HTML to the "Screen Options" box of the current page. |
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* Callback for the 'screen_settings' filter (available in WP 3.0 and up). |
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* |
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* @access private |
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* |
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* @param string $current |
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* @param string $screen Screen object (undocumented). |
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* @return string The HTML code to append to "Screen Options" |
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*/ |
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function append_screen_settings($current, $screen){ |
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global $hook_suffix; |
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|
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//Sanity check |
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if ( !isset($screen->id) ) { |
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return $current; |
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} |
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|
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//Are there any panels that want to appear on this page? |
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$panels = $this->get_panels_for_screen($screen->id, $hook_suffix); |
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if ( empty($panels) ){ |
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return $current; |
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} |
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|
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//Append all panels registered for this screen |
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foreach($panels as $panel_id){ |
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$panel = $this->registered_panels[$panel_id]; |
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|
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//Add panel title |
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if ( !empty($panel['title']) ){ |
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$current .= "\n<h5>".$panel['title']."</h5>\n"; |
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} |
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//Generate panel contents |
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if ( is_callable($panel['callback']) ){ |
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$contents = call_user_func($panel['callback']); |
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$classes = array( |
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'metabox-prefs', |
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'custom-options-panel', |
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); |
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if ( $panel['autosave'] ){ |
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$classes[] = 'requires-autosave'; |
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} |
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|
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$contents = sprintf( |
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'<div id="%s" class="%s"><input type="hidden" name="_wpnonce-%s" value="%s" />%s</div>', |
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esc_attr($panel_id), |
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implode(' ',$classes), |
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esc_attr($panel_id), |
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wp_create_nonce('save_settings-'.$panel_id), |
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$contents |
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); |
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|
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$current .= $contents; |
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} |
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} |
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|
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return $current; |
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} |
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|
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/** |
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* AJAX callback for the "Screen Options" autosave. |
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* |
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* @access private |
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* @return void |
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*/ |
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function ajax_save_callback(){ |
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if ( empty($_POST['action']) ){ |
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die('0'); |
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} |
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|
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//The 'action' argument is in the form "save_settings-panel_id" |
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$id = end(explode('-', $_POST['action'], 2)); |
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|
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//Basic security check. |
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check_ajax_referer('save_settings-' . $id, '_wpnonce-' . $id); |
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|
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//Hand the request to the registered callback, if any |
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if ( !isset($this->registered_panels[$id]) ){ |
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exit('0'); |
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} |
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$panel = $this->registered_panels[$id]; |
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if ( is_callable($panel['save_callback']) ){ |
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call_user_func($panel['save_callback'], $_POST); |
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die('1'); |
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} else { |
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die('0'); |
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} |
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} |
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|
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/** |
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* Add/enqueue supporting JavaScript for the autosave function of custom "Screen Options" panels. |
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* |
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* Checks if the current page is supposed to contain any autosave-enabled |
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* panels and adds the script only if that's the case. |
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* |
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* @return void |
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*/ |
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function add_autosave_script(){ |
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//Get the page id/hook/slug/whatever. |
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global $hook_suffix; |
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|
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//Check if we have some panels with autosave registered for this page. |
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$panels = $this->get_panels_for_screen('', $hook_suffix); |
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if ( empty($panels) ){ |
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return; |
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} |
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|
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$got_autosave = false; |
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foreach($panels as $panel_id){ |
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if ( $this->registered_panels[$panel_id]['autosave'] ){ |
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$got_autosave = true; |
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break; |
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} |
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} |
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|
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if ( $got_autosave ){ |
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//Enqueue the script itself |
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$url = EDIT_FLOW_URL . '/common/js/screen-options.js'; |
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wp_enqueue_script('screen-options-custom-autosave', $url, array('jquery'), EDIT_FLOW_VERSION ); |
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} |
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} |
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|
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/** |
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* Get custom panels registered for a particular screen and/or page. |
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* |
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* @param string $screen_id Screen ID. |
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* @param string $page Optional. Page filename or hook name. |
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* @return array Array of custom panels. |
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*/ |
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function get_panels_for_screen($screen_id, $page = ''){ |
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if ( isset($this->page_panels[$screen_id]) && !empty($this->page_panels[$screen_id]) ){ |
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$panels = $this->page_panels[$screen_id]; |
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} else { |
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$panels = array(); |
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} |
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if ( !empty($page) ){ |
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$page_as_screen = $this->page_to_screen_id($page); |
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if ( isset($this->page_panels[$page_as_screen]) && !empty($this->page_panels[$page_as_screen]) ){ |
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$panels = array_merge($panels, $this->page_panels[$page_as_screen]); |
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} |
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} |
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return array_unique($panels); |
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} |
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} |
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|
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//All versions of the class are stored in a global array |
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//and only the latest version is actually used. |
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global $ws_screen_options_versions; |
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if ( !isset($ws_screen_options_versions) ){ |
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$ws_screen_options_versions = array(); |
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} |
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$ws_screen_options_versions['1.0'] = 'wsScreenOptions10'; |
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|
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endif; |
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|
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if ( !function_exists('add_screen_options_panel') ){ |
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|
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/** |
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* Add a new settings panel to the "Screen Options" box. |
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* |
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* @see wsScreenOptions10::add_screen_options_panel() |
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* |
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* @param string $id String to use in the 'id' attribute of the settings panel. Should be unique. |
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* @param string $title Title of the settings panel. Set to an empty string to omit title. |
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* @param callback $callback Function that fills the panel with the desired content. Should return its output. |
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* @param string|array $page The page(s) on which to show the panel (similar to add_meta_box()). |
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* @param callback $save_callback Optional. Function that saves the settings contained in the panel. |
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* @param bool $autosave Optional. If set, settings will be automatically saved (via AJAX) when the value of any input element in the panel changes. Defaults to false. |
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* @return void |
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*/ |
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function add_screen_options_panel($id, $title, $callback, $page, $save_callback = null, $autosave = false){ |
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global $ws_screen_options_versions; |
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|
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static $instance = null; |
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if ( is_null($instance) ){ |
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//Instantiate the latest version of the wsScreenOptions class |
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uksort($ws_screen_options_versions, 'version_compare'); |
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$className = end($ws_screen_options_versions); |
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$instance = new $className; |
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} |
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|
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return $instance->add_screen_options_panel($id, $title, $callback, $page, $save_callback, $autosave); |
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} |
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|
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} |
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|
