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<?php
class DreamTeamPageTemplater
{
private static $instance;
protected $templates;
public static function get_instance()
{
if (null == self::$instance) {
self::$instance = new DreamTeamPageTemplater();
}
return self::$instance;
}
private function __construct()
{
$this->templates = array();
// Add a filter to the wp 4.7 version attributes metabox
add_filter('theme_page_templates', array($this, 'add_new_template'));
// Add a filter to the save post to inject out template into the page cache
add_filter('wp_insert_post_data', array($this, 'register_project_templates'));
// Add a filter to the template include to determine if the page has our
// template assigned and return it's path
add_filter('template_include', array($this, 'view_project_template'));
// Add your templates to this array.
$this->templates = array(
'templates/sps-template.php' => 'DRT - SPS page',
);
}
public function add_new_template($posts_templates)
{
$posts_templates = array_merge($posts_templates, $this->templates);
return $posts_templates;
}
public function register_project_templates($atts)
{
// Create the key used for the themes cache
$cache_key = 'page_templates-' . md5(get_theme_root() . '/' . get_stylesheet());
// Retrieve the cache list.
// If it doesn't exist, or it's empty prepare an array
$templates = wp_get_theme()->get_page_templates();
if (empty($templates)) {
$templates = array();
}
// New cache, therefore remove the old one
wp_cache_delete($cache_key, 'themes');
// Now add our template to the list of templates by merging our templates
// with the existing templates array from the cache.
$templates = array_merge($templates, $this->templates);
// Add the modified cache to allow WordPress to pick it up for listing
// available templates
wp_cache_add($cache_key, $templates, 'themes', 1800);
return $atts;
}
public function view_project_template($template)
{
// Get global post
global $post;
// Return template if post is empty
if (!$post) {
return $template;
}
// Return default template if we don't have a custom one defined
if (
!isset($this->templates[get_post_meta(
$post->ID,
'_wp_page_template',
true
)])
) {
return $template;
}
$file = plugin_dir_path(__FILE__) . get_post_meta(
$post->ID,
'_wp_page_template',
true
);
// Just to be safe, we check if the file exist first
if (file_exists($file)) {
return $file;
} else {
echo $file;
}
// Return template
return $template;
}
}
add_action('plugins_loaded', array('DreamTeamPageTemplater', 'get_instance'));
|