单个插件文件，包含类、实例化对象和可选函数
<?php
/*
Plugin Name: WP Comment Notes
Plugin URI: http://andrewnorcross.com/plugins/
Description: Add custom notes before or after the comment form.
Version: 1.0.0
Author: Andrew Norcross
Author URI: http://andrewnorcross.com
Copyright 2013 Andrew Norcross
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2, as
published by the Free Software Foundation.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
if( !defined( 'WPCMN_VER' ) )
define( 'WPCMN_VER', '1.0.0' );
// Start up the engine
class WP_Comment_Notes
{
/**
* Static property to hold our singleton instance
*
*/
static $instance = false;
/**
* This is our constructor
*
* @return void
*/
private function __construct() {
// back end
add_action ( 'plugins_loaded', array( $this, 'textdomain' ) );
add_action ( 'admin_enqueue_scripts', array( $this, 'admin_scripts' ) );
add_action ( 'do_meta_boxes', array( $this, 'create_metaboxes' ), 10, 2 );
add_action ( 'save_post', array( $this, 'save_custom_meta' ), 1 );
// front end
add_action ( 'wp_enqueue_scripts', array( $this, 'front_scripts' ), 10 );
add_filter ( 'comment_form_defaults', array( $this, 'custom_notes_filter' ) );
}
/**
* If an instance exists, this returns it. If not, it creates one and
* retuns it.
*
* @return WP_Comment_Notes
*/
public static function getInstance() {
if ( !self::$instance )
self::$instance = new self;
return self::$instance;
}
/**
* load textdomain
*
* @return void
*/
public function textdomain() {
load_plugin_textdomain( 'wpcmn', false, dirname( plugin_basename( __FILE__ ) ) . '/languages/' );
}
/**
* Admin styles
*
* @return void
*/
public function admin_scripts() {
$types = $this->get_post_types();
$screen = get_current_screen();
if ( in_array( $screen->post_type , $types ) ) :
wp_enqueue_style( 'wpcmn-admin', plugins_url('lib/css/admin.css', __FILE__), array(), WPCMN_VER, 'all' );
endif;
}
/**
* call metabox
*
* @return void
*/
public function create_metaboxes( $page, $context ) {
$types = $this->get_post_types();
if ( in_array( $page, $types ) )
add_meta_box( 'wp-comment-notes', __( 'Comment Notes', 'wpcmn' ), array( $this, 'wpcmn_notes_meta' ), $page, 'advanced', 'high' );
}
/**
* display meta fields for notes meta
*
* @return void
*/
public function wpcmn_notes_meta( $post ) {
// Use nonce for verification
wp_nonce_field( 'wpcmn_meta_nonce', 'wpcmn_meta_nonce' );
$post_id = $post->ID;
// get postmeta, and our initial settings
$notes = get_post_meta( $post_id, '_wpcmn_notes', true );
$before_text = isset( $notes['before-text'] ) ? $notes['before-text'] : '';
$before_type = isset( $notes['before-type'] ) ? $notes['before-type'] : 'wpcmn-notes-standard';
$after_text = isset( $notes['after-text'] ) ? $notes['after-text'] : '';
$after_type = isset( $notes['after-type'] ) ? $notes['after-type'] : 'wpcmn-notes-standard';
echo '<script type="text/javascript">jQuery(document).ready(function($){$("#comment_status").click(function(){$(".wpcmn-notes-table tr").toggle();})});</script>';
$disabled_display = comments_open( $post_id ) ? ' style="display:none;"' : '';
$enabled_display = ! comments_open( $post_id ) ? ' style="display:none;"' : '';
echo '<table class="form-table wpcmn-notes-table">';
echo '<tr class="wpcmn-notes-disabled"' . $disabled_display . '>';
echo '<th>' . __( 'Enable comments in order to use Comment Notes', 'wpcmn' ) . '</th>';
echo '</tr>';
echo '<tr class="wpcmn-notes-title"' . $enabled_display . '>';
echo '<td colspan="2"><h5>'.__( 'Before Notes Area', 'wpcmn' ) . '</h5></td>';
echo '</tr>';
echo '<tr class="wpcmn-notes-data wpcmn-notes-before-text"' . $enabled_display . '>';
echo '<th>'.__( 'Message Text', 'wpcmn' ) . '</th>';
echo '<td>';
echo '<textarea class="widefat" name="wpcmn-notes[before-text]" id="wpcmn-before">'.esc_attr( $before_text ) . '</textarea>';
echo '<p class="description">'.__( 'Note: This will not appear to users who are logged in.', 'wpcmn' ) . '</p>';
echo '</td>';
echo '</tr>';
echo '<tr class="wpcmn-notes-data wpcmn-notes-before-type"' . $enabled_display . '>';
echo '<th>'.__( 'Message Type', 'wpcmn' ) . '</th>';
echo '<td>';
echo '<select id="wpcmn-before-type" name="wpcmn-notes[before-type]">';
echo '<option value="wpcmn-notes-standard"' . selected( $before_type, 'wpcmn-notes-standard', false ) . '>' . __( 'Standard', 'wpcmn' ) . '</option>';
echo '<option value="wpcmn-notes-warning"' . selected( $before_type, 'wpcmn-notes-warning', false ) . '>' . __( 'Warning', 'wpcmn' ) . '</option>';
echo '<option value="wpcmn-notes-alert"' . selected( $before_type, 'wpcmn-notes-alert', false ) . '>' . __( 'Alert', 'wpcmn' ) . '</option>';
do_action( 'wpcmn_before_types', $before_type );
echo '</select>';
echo '</td>';
echo '</tr>';
echo '<tr class="wpcmn-notes-title"' . $enabled_display . '>';
echo '<td colspan="2"><h5>'.__( 'After Notes Area', 'wpcmn' ) . '</h5></td>';
echo '</tr>';
echo '<tr class="wpcmn-notes-data wpcmn-notes-after-text"' . $enabled_display . '>';
echo '<th>'.__( 'Message Text', 'wpcmn' ) . '</th>';
echo '<td>';
echo '<textarea class="widefat" name="wpcmn-notes[after-text]" id="wpcmn-after">'.esc_attr( $after_text ) . '</textarea>';
echo '</td>';
echo '</tr>';
echo '<tr class="wpcmn-notes-data wpcmn-notes-after-type"' . $enabled_display . '>';
echo '<th>'.__( 'Message Type', 'wpcmn' ) . '</th>';
echo '<td>';
echo '<select id="wpcmn-after-type" name="wpcmn-notes[after-type]">';
echo '<option value="wpcmn-notes-standard"' . selected( $after_type, 'wpcmn-notes-standard', false ) . '>' . __( 'Standard', 'wpcmn' ) . '</option>';
echo '<option value="wpcmn-notes-warning"' . selected( $after_type, 'wpcmn-notes-warning', false ) . '>' . __( 'Warning', 'wpcmn' ) . '</option>';
echo '<option value="wpcmn-notes-alert"' . selected( $after_type, 'wpcmn-notes-alert', false ) . '>' . __( 'Alert', 'wpcmn' ) . '</option>';
do_action( 'wpcmn_after_types', $after_type );
echo '</select>';
echo '</td>';
echo '</tr>';
echo '</table>';
}
/**
* save post metadata
*
* @return void
*/
public function save_custom_meta( $post_id ) {
// make sure we aren't using autosave
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
return $post_id;
// do our nonce check. ALWAYS A NONCE CHECK
if ( ! isset( $_POST['wpcmn_meta_nonce'] ) || ! wp_verify_nonce( $_POST['wpcmn_meta_nonce'], 'wpcmn_meta_nonce' ) )
return $post_id;
$types = $this->get_post_types();
if ( !in_array ( $_POST['post_type'], $types ) )
return $post_id;
// and make sure the user has the ability to do shit
if ( 'page' == $_POST['post_type'] ) {
if ( ! current_user_can( 'edit_page', $post_id ) ) {
return $post_id;
}
} else {
if ( ! current_user_can( 'edit_post', $post_id ) ) {
return $post_id;
}
}
// all clear. get data via $_POST and store it
$notes = ! empty( $_POST['wpcmn-notes'] ) ? $_POST['wpcmn-notes'] : false;
// update side meta data
if ( $notes ) {
$allowed_html = array(
'a' => array(
'href' => array(),
'title' => array(),
'class' => array(),
'id' => array()
),
'br' => array(),
'em' => array(),
'strong' => array(),
'span' => array(
'class' => array(),
'id' => array()
)
);
update_post_meta( $post_id, '_wpcmn_notes', wp_kses( $notes, $allowed_html ) );
do_action( 'wpcmn_notes_save', $post_id, $notes );
} else {
delete_post_meta( $post_id, '_wpcmn_notes' );
}
}
/**
* call front-end CSS
*
* @return void
*/
public function front_scripts() {
// check for killswitch first
$killswitch = apply_filters( 'wpcmn_killswitch', false );
if ( $killswitch )
return false;
$types = $this->get_post_types();
if ( is_singular( $types ) )
wp_enqueue_style( 'wpcmn-notes', plugins_url( 'lib/css/wpcmn-notes.css', __FILE__ ), array(), WPCMN_VER, 'all' );
}
/**
* The actual filter for adding the notes.
*
* @return array
*/
public function custom_notes_filter( $fields ) {
global $post;
// get the possible meta fields
$notes = get_post_meta( $post->ID, '_wpcmn_notes', true );
if ( empty( $notes ) )
return $fields;
if ( isset( $notes['before-text'] ) ) :
// grab the variables
$text = $notes['before-text'];
$class = isset( $notes['before-type'] ) ? $notes['before-type'] : 'wpcmn-notes-standard';
// build the string
$before = '<p class="wpcmn-notes wpcmn-notes-before' . esc_attr( $class ) . '">' . $text . '</p>';
// output
$fields['comment_notes_before'] = $before;
endif;
if ( isset( $notes['after-text'] ) ) :
// grab the variables
$text = $notes['after-text'];
$class = isset( $notes['after-type'] ) ? $notes['after-type'] : 'wpcmn-notes-standard';
// build the string
$after = '<p class="wpcmn-notes wpcmn-notes-after' . esc_attr( $class ) . '">' . $text . '</p>';
// output
$fields['comment_notes_after'] = $after;
endif;
return $fields;
}
/**
* Return the list of post types that support Comment Notes
*
* @return array
*/
public function get_post_types() {
$types = get_post_types( array( 'public' => true, 'show_ui' => true ) );
foreach( $types as $type ) {
if( ! post_type_supports( $type, 'comments' ) ) {
unset( $types[ $type ] );
}
}
return apply_filters( 'wpcmn_type_support', $types );
}
/// end class
}
// Instantiate our class
$WP_Comment_Notes = WP_Comment_Notes::getInstance();
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