www.gusucode.com > wordpress PHP博客系统英文版 v4.5.1PHP源码程序 > wordpress PHP博客系统英文版 v4.5.1/wordpress/wordpress/wp-content/themes/twentyfourteen/inc/featured-content.php
<?php
/**
* Twenty Fourteen Featured Content
*
* This module allows you to define a subset of posts to be displayed
* in the theme's Featured Content area.
*
* For maximum compatibility with different methods of posting users
* will designate a featured post tag to associate posts with. Since
* this tag now has special meaning beyond that of a normal tags, users
* will have the ability to hide it from the front end of their site.
*/
class Featured_Content {
/**
* The maximum number of posts a Featured Content area can contain.
*
* We define a default value here but themes can override
* this by defining a "max_posts" entry in the second parameter
* passed in the call to add_theme_support( 'featured-content' ).
*
* @see Featured_Content::init()
*
* @since Twenty Fourteen 1.0
*
* @static
* @access public
* @var int
*/
public static $max_posts = 15;
/**
* Instantiate.
*
* All custom functionality will be hooked into the "init" action.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*/
public static function setup() {
add_action( 'init', array( __CLASS__, 'init' ), 30 );
}
/**
* Conditionally hook into WordPress.
*
* Theme must declare that they support this module by adding
* add_theme_support( 'featured-content' ); during after_setup_theme.
*
* If no theme support is found there is no need to hook into WordPress.
* We'll just return early instead.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*/
public static function init() {
$theme_support = get_theme_support( 'featured-content' );
// Return early if theme does not support Featured Content.
if ( ! $theme_support ) {
return;
}
/*
* An array of named arguments must be passed as the second parameter
* of add_theme_support().
*/
if ( ! isset( $theme_support[0] ) ) {
return;
}
// Return early if "featured_content_filter" has not been defined.
if ( ! isset( $theme_support[0]['featured_content_filter'] ) ) {
return;
}
$filter = $theme_support[0]['featured_content_filter'];
// Theme can override the number of max posts.
if ( isset( $theme_support[0]['max_posts'] ) ) {
self::$max_posts = absint( $theme_support[0]['max_posts'] );
}
add_filter( $filter, array( __CLASS__, 'get_featured_posts' ) );
add_action( 'customize_register', array( __CLASS__, 'customize_register' ), 9 );
add_action( 'admin_init', array( __CLASS__, 'register_setting' ) );
add_action( 'switch_theme', array( __CLASS__, 'delete_transient' ) );
add_action( 'save_post', array( __CLASS__, 'delete_transient' ) );
add_action( 'delete_post_tag', array( __CLASS__, 'delete_post_tag' ) );
add_action( 'customize_controls_enqueue_scripts', array( __CLASS__, 'enqueue_scripts' ) );
add_action( 'pre_get_posts', array( __CLASS__, 'pre_get_posts' ) );
add_action( 'wp_loaded', array( __CLASS__, 'wp_loaded' ) );
}
/**
* Hide "featured" tag from the front end.
*
* Has to run on wp_loaded so that the preview filters of the Customizer
* have a chance to alter the value.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*/
public static function wp_loaded() {
if ( self::get_setting( 'hide-tag' ) ) {
add_filter( 'get_terms', array( __CLASS__, 'hide_featured_term' ), 10, 3 );
add_filter( 'get_the_terms', array( __CLASS__, 'hide_the_featured_term' ), 10, 3 );
}
}
/**
* Get featured posts.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @return array Array of featured posts.
*/
public static function get_featured_posts() {
$post_ids = self::get_featured_post_ids();
// No need to query if there is are no featured posts.
if ( empty( $post_ids ) ) {
return array();
}
$featured_posts = get_posts( array(
'include' => $post_ids,
'posts_per_page' => count( $post_ids ),
) );
return $featured_posts;
}
/**
* Get featured post IDs
*
* This function will return the an array containing the
* post IDs of all featured posts.
*
* Sets the "featured_content_ids" transient.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @return array Array of post IDs.
*/
public static function get_featured_post_ids() {
// Get array of cached results if they exist.
$featured_ids = get_transient( 'featured_content_ids' );
if ( false === $featured_ids ) {
$settings = self::get_setting();
$term = get_term_by( 'name', $settings['tag-name'], 'post_tag' );
if ( $term ) {
// Query for featured posts.
$featured_ids = get_posts( array(
'fields' => 'ids',
'numberposts' => self::$max_posts,
'suppress_filters' => false,
'tax_query' => array(
array(
'field' => 'term_id',
'taxonomy' => 'post_tag',
'terms' => $term->term_id,
),
),
) );
}
// Get sticky posts if no Featured Content exists.
if ( ! $featured_ids ) {
$featured_ids = self::get_sticky_posts();
}
set_transient( 'featured_content_ids', $featured_ids );
}
// Ensure correct format before return.
return array_map( 'absint', $featured_ids );
}
/**
* Return an array with IDs of posts maked as sticky.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @return array Array of sticky posts.
*/
public static function get_sticky_posts() {
return array_slice( get_option( 'sticky_posts', array() ), 0, self::$max_posts );
}
/**
* Delete featured content ids transient.
*
* Hooks in the "save_post" action.
*
* @see Featured_Content::validate_settings().
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*/
public static function delete_transient() {
delete_transient( 'featured_content_ids' );
}
/**
* Exclude featured posts from the home page blog query.
*
* Filter the home page posts, and remove any featured post ID's from it.
* Hooked onto the 'pre_get_posts' action, this changes the parameters of
* the query before it gets any posts.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @param WP_Query $query WP_Query object.
* @return WP_Query Possibly-modified WP_Query.
*/
public static function pre_get_posts( $query ) {
// Bail if not home or not main query.
if ( ! $query->is_home() || ! $query->is_main_query() ) {
return;
}
// Bail if the blog page is not the front page.
if ( 'posts' !== get_option( 'show_on_front' ) ) {
return;
}
$featured = self::get_featured_post_ids();
// Bail if no featured posts.
if ( ! $featured ) {
return;
}
// We need to respect post ids already in the blacklist.
$post__not_in = $query->get( 'post__not_in' );
if ( ! empty( $post__not_in ) ) {
$featured = array_merge( (array) $post__not_in, $featured );
$featured = array_unique( $featured );
}
$query->set( 'post__not_in', $featured );
}
/**
* Reset tag option when the saved tag is deleted.
*
* It's important to mention that the transient needs to be deleted,
* too. While it may not be obvious by looking at the function alone,
* the transient is deleted by Featured_Content::validate_settings().
*
* Hooks in the "delete_post_tag" action.
*
* @see Featured_Content::validate_settings().
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @param int $tag_id The term_id of the tag that has been deleted.
*/
public static function delete_post_tag( $tag_id ) {
$settings = self::get_setting();
if ( empty( $settings['tag-id'] ) || $tag_id != $settings['tag-id'] ) {
return;
}
$settings['tag-id'] = 0;
$settings = self::validate_settings( $settings );
update_option( 'featured-content', $settings );
}
/**
* Hide featured tag from displaying when global terms are queried from the front end.
*
* Hooks into the "get_terms" filter.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @param array $terms List of term objects. This is the return value of get_terms().
* @param array $taxonomies An array of taxonomy slugs.
* @return array A filtered array of terms.
*
* @uses Featured_Content::get_setting()
*/
public static function hide_featured_term( $terms, $taxonomies, $args ) {
// This filter is only appropriate on the front end.
if ( is_admin() ) {
return $terms;
}
// We only want to hide the featured tag.
if ( ! in_array( 'post_tag', $taxonomies ) ) {
return $terms;
}
// Bail if no terms were returned.
if ( empty( $terms ) ) {
return $terms;
}
// Bail if term objects are unavailable.
if ( 'all' != $args['fields'] ) {
return $terms;
}
$settings = self::get_setting();
foreach ( $terms as $order => $term ) {
if ( ( $settings['tag-id'] === $term->term_id || $settings['tag-name'] === $term->name ) && 'post_tag' === $term->taxonomy ) {
unset( $terms[ $order ] );
}
}
return $terms;
}
/**
* Hide featured tag from display when terms associated with a post object
* are queried from the front end.
*
* Hooks into the "get_the_terms" filter.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @param array $terms A list of term objects. This is the return value of get_the_terms().
* @param int $id The ID field for the post object that terms are associated with.
* @param array $taxonomy An array of taxonomy slugs.
* @return array Filtered array of terms.
*
* @uses Featured_Content::get_setting()
*/
public static function hide_the_featured_term( $terms, $id, $taxonomy ) {
// This filter is only appropriate on the front end.
if ( is_admin() ) {
return $terms;
}
// Make sure we are in the correct taxonomy.
if ( 'post_tag' != $taxonomy ) {
return $terms;
}
// No terms? Return early!
if ( empty( $terms ) ) {
return $terms;
}
$settings = self::get_setting();
foreach ( $terms as $order => $term ) {
if ( ( $settings['tag-id'] === $term->term_id || $settings['tag-name'] === $term->name ) && 'post_tag' === $term->taxonomy ) {
unset( $terms[ $term->term_id ] );
}
}
return $terms;
}
/**
* Register custom setting on the Settings -> Reading screen.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*/
public static function register_setting() {
register_setting( 'featured-content', 'featured-content', array( __CLASS__, 'validate_settings' ) );
}
/**
* Add settings to the Customizer.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @param WP_Customize_Manager $wp_customize Customizer object.
*/
public static function customize_register( $wp_customize ) {
$wp_customize->add_section( 'featured_content', array(
'title' => __( 'Featured Content', 'twentyfourteen' ),
'description' => sprintf( __( 'Use a <a href="%1$s">tag</a> to feature your posts. If no posts match the tag, <a href="%2$s">sticky posts</a> will be displayed instead.', 'twentyfourteen' ),
esc_url( add_query_arg( 'tag', _x( 'featured', 'featured content default tag slug', 'twentyfourteen' ), admin_url( 'edit.php' ) ) ),
admin_url( 'edit.php?show_sticky=1' )
),
'priority' => 130,
'theme_supports' => 'featured-content',
) );
// Add Featured Content settings.
$wp_customize->add_setting( 'featured-content[tag-name]', array(
'default' => _x( 'featured', 'featured content default tag slug', 'twentyfourteen' ),
'type' => 'option',
'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ),
) );
$wp_customize->add_setting( 'featured-content[hide-tag]', array(
'default' => true,
'type' => 'option',
'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ),
) );
// Add Featured Content controls.
$wp_customize->add_control( 'featured-content[tag-name]', array(
'label' => __( 'Tag Name', 'twentyfourteen' ),
'section' => 'featured_content',
'priority' => 20,
) );
$wp_customize->add_control( 'featured-content[hide-tag]', array(
'label' => __( 'Don’t display tag on front end.', 'twentyfourteen' ),
'section' => 'featured_content',
'type' => 'checkbox',
'priority' => 30,
) );
}
/**
* Enqueue the tag suggestion script.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*/
public static function enqueue_scripts() {
wp_enqueue_script( 'featured-content-suggest', get_template_directory_uri() . '/js/featured-content-admin.js', array( 'jquery', 'suggest' ), '20131022', true );
}
/**
* Get featured content settings.
*
* Get all settings recognized by this module. This function
* will return all settings whether or not they have been stored
* in the database yet. This ensures that all keys are available
* at all times.
*
* In the event that you only require one setting, you may pass
* its name as the first parameter to the function and only that
* value will be returned.
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @param string $key The key of a recognized setting.
* @return mixed Array of all settings by default. A single value if passed as first parameter.
*/
public static function get_setting( $key = 'all' ) {
$saved = (array) get_option( 'featured-content' );
$defaults = array(
'hide-tag' => 1,
'tag-id' => 0,
'tag-name' => _x( 'featured', 'featured content default tag slug', 'twentyfourteen' ),
);
$options = wp_parse_args( $saved, $defaults );
$options = array_intersect_key( $options, $defaults );
if ( 'all' != $key ) {
return isset( $options[ $key ] ) ? $options[ $key ] : false;
}
return $options;
}
/**
* Validate featured content settings.
*
* Make sure that all user supplied content is in an expected
* format before saving to the database. This function will also
* delete the transient set in Featured_Content::get_featured_content().
*
* @static
* @access public
* @since Twenty Fourteen 1.0
*
* @param array $input Array of settings input.
* @return array Validated settings output.
*/
public static function validate_settings( $input ) {
$output = array();
if ( empty( $input['tag-name'] ) ) {
$output['tag-id'] = 0;
} else {
$term = get_term_by( 'name', $input['tag-name'], 'post_tag' );
if ( $term ) {
$output['tag-id'] = $term->term_id;
} else {
$new_tag = wp_create_tag( $input['tag-name'] );
if ( ! is_wp_error( $new_tag ) && isset( $new_tag['term_id'] ) ) {
$output['tag-id'] = $new_tag['term_id'];
}
}
$output['tag-name'] = $input['tag-name'];
}
$output['hide-tag'] = isset( $input['hide-tag'] ) && $input['hide-tag'] ? 1 : 0;
// Delete the featured post ids transient.
self::delete_transient();
return $output;
}
} // Featured_Content
Featured_Content::setup();