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<?php
/**
* This plugin allows you to include templates with your plugin so that they can
* be added with any theme.
*
* @package Page Template Example
* @version 1.0.0
* @since 0.1.0
*/
class Purchasing_Template_Plugin {
/**
* Plugin version, used for cache-busting of style and script file references.
*
* @since 1.0.0
*
* @var string
*/
const VERSION = '1.0.0';
/**
* Unique identifier for the plugin.
*
* The variable name is used as the text domain when internationalizing strings
* of text.
*
* @since 1.0.0
*
* @var string
*/
protected $plugin_slug;
/**
* A reference to an instance of this class.
*
* @since 0.1.0
*
* @var Page_Template_Plugin
*/
private static $instance;
/**
* The array of templates that this plugin tracks.
*
* @var array
*/
protected $templates;
/**
* Returns an instance of this class. An implementation of the singleton design pattern.
*
* @return Page_Templae_Example A reference to an instance of this class.
* @since 1.0.0
*/
public static function get_instance() {
if( null == self::$instance ) {
self::$instance = new Purchasing_Template_Plugin();
} // end if
return self::$instance;
} // end getInstance
/**
* Initializes the plugin by setting localization, filters, and administration functions.
*
* @version 1.0.0
* @since 1.0.0
*/
private function __construct() {
$this->templates = array();
$this->plugin_locale = 'pte';
// Grab the translations for the plugin
add_action( 'init', array( $this, 'load_plugin_textdomain' ) );
add_filter('theme_page_templates', array( $this, 'add_page_templates'));
// Add a filter to the template include in order to determine if the page has our template assigned and return it's path
add_filter('template_include', array( $this, 'view_project_template') );
// Register hooks that are fired when the plugin is activated, deactivated, and uninstalled, respectively.
register_deactivation_hook( __FILE__, array( $this, 'deactivate' ) );
// Add your templates to this array.
$this->templates = array(
'page-purchasing.php' => __( 'Purchasing', $this->plugin_slug )
);
// adding support for theme templates to be merged and shown in dropdown
$templates = wp_get_theme()->get_page_templates();
$templates = array_merge( $templates, $this->templates );
} // end constructor
/**
* Load the plugin text domain for translation.
*
* @since 1.0.0
*/
public function load_plugin_textdomain() {
$domain = $this->plugin_slug;
$locale = apply_filters( 'plugin_locale', get_locale(), $domain );
load_textdomain( $domain, trailingslashit( WP_LANG_DIR ) . $domain . '/' . $domain . '-' . $locale . '.mo' );
load_plugin_textdomain( $domain, FALSE, basename( dirname( __FILE__ ) ) . '/languages/' );
} // end load_plugin_textdomain
/**
* Adds our template to the pages cache in order to trick WordPress
* into thinking the template file exists where it doens't really exist.
*
* @param array $atts The attributes for the page attributes dropdown
* @return array $atts The attributes for the page attributes dropdown
* @verison 1.0.0
* @since 1.0.0
*/
public function add_page_templates($templates){
$templates = array_merge( $templates, $this->templates );
return $templates;
}
/**
* Checks if the template is assigned to the page
*
* @version 1.0.0
* @since 1.0.0
*/
public function view_project_template( $template ) {
global $post;
// If no posts found, return to
// avoid "Trying to get property of non-object" error
if ( !isset( $post ) ) return $template;
if ( ! isset( $this->templates[ get_post_meta( $post->ID, '_wp_page_template', true ) ] ) ) {
return $template;
} // end if
$file = plugin_dir_path( __FILE__ ) . 'templates/' . 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;
} // end if
return $template;
} // end view_project_template
/*--------------------------------------------*
* deactivate the plugin
*---------------------------------------------*/
static function deactivate( $network_wide ) {
foreach($this as $value) {
page-template-example::delete_template( $value );
}
} // end deactivate
/*--------------------------------------------*
* Delete Templates from Theme
*---------------------------------------------*/
public function delete_template( $filename ){
$theme_path = get_template_directory();
$template_path = $theme_path . '/' . $filename;
if( file_exists( $template_path ) ) {
unlink( $template_path );
}
// we should probably delete the old cache
wp_cache_delete( $cache_key , 'themes');
}
/**
* Retrieves and returns the slug of this plugin. This function should be called on an instance
* of the plugin outside of this class.
*
* @return string The plugin's slug used in the locale.
* @version 1.0.0
* @since 1.0.0
*/
public function get_locale() {
return $this->plugin_slug;
} // end get_locale
} // end class
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