关键词：
<?php
/*
Plugin Name: HowTo Plugin
Plugin URI:
Description: This Plugin demonstrates how you can build your own plugin pages using the WordPress provided draggable metaboxes, requires WordPress 2.7 version, supports WordPress 2.8 changed boxing layout engine
Author: Heiko, Frank
Author URI: http://bueltge.de
Version: 0.1
License:
==============================================================================
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
//avoid direct calls to this file where wp core files not present
if (!function_exists ('add_action'))
header('Status: 403 Forbidden');
header('HTTP/1.1 403 Forbidden');
exit();
define('HOWTO_METABOX_ADMIN_PAGE_NAME', 'howto_metaboxes');
//class that reperesent the complete plugin
class howto_metabox_plugin
//constructor of class, PHP4 compatible construction for backward compatibility
function howto_metabox_plugin()
//add filter for WordPress 2.8 changed backend box system !
add_filter('screen_layout_columns', array(&$this, 'on_screen_layout_columns'), 10, 2);
//register callback for admin menu setup
add_action('admin_menu', array(&$this, 'on_admin_menu'));
//register the callback been used if options of page been submitted and needs to be processed
add_action('admin_post_save_howto_metaboxes_general', array(&$this, 'on_save_changes'));
//for WordPress 2.8 we have to tell, that we support 2 columns !
function on_screen_layout_columns($columns, $screen)
if ($screen == $this->pagehook)
$columns[$this->pagehook] = 2;
return $columns;
//extend the admin menu
function on_admin_menu()
//add our own option page, you can also add it to different sections or use your own one
$this->pagehook = add_options_page('Howto Metabox Page Title', "HowTo Metaboxes", 'manage_options', HOWTO_METABOX_ADMIN_PAGE_NAME, array(&$this, 'on_show_page'));
//register callback gets call prior your own page gets rendered
add_action('load-'.$this->pagehook, array(&$this, 'on_load_page'));
//will be executed if wordpress core detects this page has to be rendered
function on_load_page()
//ensure, that the needed javascripts been loaded to allow drag/drop, expand/collapse and hide/show of boxes
wp_enqueue_script('common');
wp_enqueue_script('wp-lists');
wp_enqueue_script('postbox');
//add several metaboxes now, all metaboxes registered during load page can be switched off/on at "Screen Options" automatically, nothing special to do therefore
add_meta_box('howto-metaboxes-sidebox-1', 'Sidebox 1 Title', array(&$this, 'on_sidebox_1_content'), $this->pagehook, 'side', 'core');
add_meta_box('howto-metaboxes-sidebox-2', 'Sidebox 2 Title', array(&$this, 'on_sidebox_2_content'), $this->pagehook, 'side', 'core');
add_meta_box('howto-metaboxes-contentbox-1', 'Contentbox 1 Title', array(&$this, 'on_contentbox_1_content'), $this->pagehook, 'normal', 'core');
add_meta_box('howto-metaboxes-contentbox-2', 'Contentbox 2 Title', array(&$this, 'on_contentbox_2_content'), $this->pagehook, 'normal', 'core');
add_meta_box('howto-metaboxes-contentbox-additional-1', 'Contentbox Additional 1 Title', array(&$this, 'on_contentbox_additional_1_content'), $this->pagehook, 'additional', 'core');
add_meta_box('howto-metaboxes-contentbox-additional-2', 'Contentbox Additional 2 Title', array(&$this, 'on_contentbox_additional_2_content'), $this->pagehook, 'additional', 'core');
//executed to show the plugins complete admin page
function on_show_page()
//we need the global screen column value to beable to have a sidebar in WordPress 2.8
global $screen_layout_columns;
//add a 3rd content box now for demonstration purpose, boxes added at start of page rendering can't be switched on/off,
//may be needed to ensure that a special box is always available
add_meta_box('howto-metaboxes-contentbox-3', 'Contentbox 3 Title (impossible to hide)', array(&$this, 'on_contentbox_3_content'), $this->pagehook, 'normal', 'core');
//define some data can be given to each metabox during rendering
$data = array('My Data 1', 'My Data 2', 'Available Data 1');
?>
<div id="howto-metaboxes-general" class="wrap">
<?php screen_icon('options-general'); ?>
<h2>Metabox Showcase Plugin Page</h2>
<form action="admin-post.php" method="post">
<?php wp_nonce_field('howto-metaboxes-general'); ?>
<?php wp_nonce_field('closedpostboxes', 'closedpostboxesnonce', false ); ?>
<?php wp_nonce_field('meta-box-order', 'meta-box-order-nonce', false ); ?>
<input type="hidden" name="action" value="save_howto_metaboxes_general" />
<div id="poststuff" class="metabox-holder<?php echo 2 == $screen_layout_columns ? ' has-right-sidebar' : ''; ?>">
<div id="side-info-column" class="inner-sidebar">
<?php do_meta_boxes($this->pagehook, 'side', $data); ?>
</div>
<div id="post-body" class="has-sidebar">
<div id="post-body-content" class="has-sidebar-content">
<?php do_meta_boxes($this->pagehook, 'normal', $data); ?>
<h4>Static text and input section</h4>
<p>Here is some static paragraph or your own static content. Can be placed where ever you want.</p>
<textarea name="static-textarea" style="width:100%;">Change this text ....</textarea>
<br/>
<?php do_meta_boxes($this->pagehook, 'additional', $data); ?>
<p>
<input type="submit" value="Save Changes" class="button-primary" name="Submit"/>
</p>
</div>
</div>
<br class="clear"/>
</div>
</form>
</div>
<script type="text/javascript">
//<![CDATA[
jQuery(document).ready( function($)
// close postboxes that should be closed
$('.if-js-closed').removeClass('if-js-closed').addClass('closed');
// postboxes setup
postboxes.add_postbox_toggles('<?php echo $this->pagehook; ?>');
);
//]]>
</script>
<?php
//executed if the post arrives initiated by pressing the submit button of form
function on_save_changes()
//user permission check
if ( !current_user_can('manage_options') )
wp_die( __('Cheatin’ uh?') );
//cross check the given referer
check_admin_referer('howto-metaboxes-general');
//process here your on $_POST validation and / or option saving
//lets redirect the post request into get request (you may add additional params at the url, if you need to show save results
wp_redirect($_POST['_wp_http_referer']);
//below you will find for each registered metabox the callback method, that produces the content inside the boxes
//i did not describe each callback dedicated, what they do can be easily inspected and compare with the admin page displayed
function on_sidebox_1_content($data)
?>
<ul style="list-style-type:disc;margin-left:20px;">
<?php foreach($data as $item) echo "<li>$item</li>"; ?>
</ul>
<?php
function on_sidebox_2_content($data)
?>
<p>You can also use static text or any markup to be shown inside the boxes.</p>
<?php
function on_contentbox_1_content($data)
sort($data);
?>
<p>The given parameter at <b>sorted</b> order are: <em><?php echo implode(' | ', $data); ?></em></p>
<?php
function on_contentbox_2_content($data)
sort($data);
?>
<p>The given parameter at <b>reverse sorted</b> order are: <em><?php echo implode(' | ', array_reverse($data)); ?></em></p>
<?php
function on_contentbox_3_content($data)
?>
<p>This metabox can be dragged an placed where ever you want but <b>can't be hidden</b> using the <em>Screen Options</em> tab slider!</p>
<?php
function on_contentbox_additional_1_content($data)
?>
<p>This and the 2nd <em>additional</em> box will be addressed by an other group identifier to render it by calling with this dedicated name.</p>
<p>You can have as much as needed box groups.</p>
<?php
function on_contentbox_additional_2_content($data)
?>
<p>metabox showcase - copyright © 2009 Heiko Rabe (<a target="_blank" href="http://www.code-styling.de">www.code-styling.de</a>)</p>
<p>requires at least WordPress 2.7 version, supports new box management of WordPress 2.8</p>
<?php
$my_howto_metabox_plugin = new howto_metabox_plugin();
?>
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