plugin.php

<?php
/*
Plugin Name: Image Parallax
Plugin URI: http://webmaestro.fr/image-parallax-plugin-wordpress/
Author: Etienne Baudry
Author URI: http://webmaestro.fr
Description: A parallax media type.
Version: 2.1
License: GNU General Public License
License URI: license.txt
Text Domain: wm-parallax
GitHub Plugin URI: https://github.com/WebMaestroFr/wm-parallax
GitHub Branch: v2
*/

class WM_Parallax
{
  public static $behaviors = array(
    'calibrate_x' => false,
    'calibrate_y' => true,
    'invert_x' => true,
    'invert_y' => true,
    'limit_x' => false,
    'limit_y' => false,
    'scalar_x' => 10.0,
    'scalar_y' => 10.0,
    'friction_x' => 0.1,
    'friction_y' => 0.1,
    'origin_x' => 0.5,
    'origin_y' => 0.5
  );

  public static function init()
  {
    add_action( 'admin_init', array( __CLASS__, 'update_plugin' ) );
    add_action( 'wp_enqueue_scripts', array( __CLASS__, 'enqueue_scripts' ) );
    add_action( 'admin_enqueue_scripts', array( __CLASS__, 'admin_enqueue_scripts' ) );
    add_action( 'print_media_templates', array( __CLASS__, 'print_media_templates' ) );
    add_filter( 'media_view_strings', array( __CLASS__, 'media_view_strings' ) );
    add_shortcode( 'parallax', array( __CLASS__, 'shortcode' ) );
  }

  public static function enqueue_scripts()
  {
    global $post;
    if ( is_object( $post ) && preg_match_all( '/\[parallax (.+)\]/', $post->post_content, $shortcodes ) ) {
      // wp_register_script( 'parallax', plugins_url( 'js/vendor/parallax.min.js', __FILE__ ), false, false, true );
      // wp_enqueue_script( 'wm-parallax', plugins_url( 'js/wm-parallax.js', __FILE__ ), array( 'parallax' ), false, true );
      wp_enqueue_script( 'wm-parallax', plugins_url( 'js/pack.js', __FILE__ ), false, false, true );
      wp_enqueue_style( 'wm-parallax', plugins_url( 'css/wm-parallax.css', __FILE__ ), false, '2.1' );
    }
  }

  public static function admin_enqueue_scripts( $hook_suffix )
  {
    if ( current_user_can( 'edit_posts' ) && ( $hook_suffix === 'post-new.php' || $hook_suffix === 'post.php' ) ) {
      wp_enqueue_media();
      wp_enqueue_script( 'wm-parallax-media', plugins_url( 'js/media.js', __FILE__ ), array( 'media-views' ), false, true );
      wp_enqueue_style( 'wm-parallax-media', plugins_url( 'css/media.css', __FILE__ ) );
      add_editor_style( plugins_url( 'css/wm-parallax.css', __FILE__ ) );
      add_editor_style( plugins_url( 'css/editor.css', __FILE__ ) );
    }
  }

  public static function print_media_templates()
  {
    include_once( plugin_dir_path( __FILE__ ) . 'tpl/editor.php' );
    include_once( plugin_dir_path( __FILE__ ) . 'tpl/settings.php' );
  }

  public static function media_view_strings( $strings )
  {
    return array_merge( $strings, array(
      'createNewParallax'   => __( 'Create a new parallax' ),
      'createParallaxTitle' => __( 'Create Parallax' ),
      'editParallaxTitle'   => __( 'Edit Parallax' ),
      'cancelParallaxTitle' => __( '&#8592; Cancel Parallax' ),
      'insertParallax'      => __( 'Insert parallax' ),
      'updateParallax'      => __( 'Update parallax' ),
      'addToParallax'       => __( 'Add Layers' ),
      'addToParallaxTitle'  => __( 'Add Layers' ),
      'deleteParallaxTitle' => __( 'Delete Parallax' ),
      'parallaxSettings'    => json_encode( self::$behaviors )
    ) );
  }

  public static function shortcode( $atts ) {
    if ( isset( $atts['ids'] ) && $ids = explode( ',', $atts['ids'] ) ) {
      if ( $count = count( $ids ) - 1 ) {
        $output = '<div class="wm-parallax"><ul class="wm-parallax-ul"';
        $atts = shortcode_atts( self::$behaviors, $atts, 'parallax' );
        foreach ( $atts as $data => $value ) {
          if ( is_bool( $value ) ) { $value = $value ? 'true' : 'false'; }
          $output .= ' data-' . str_replace( '_', '-', $data ) . '="' . $value . '"';
        }
        $output .= '>';
        foreach ( $ids as $i => $id ) {
          $depth = round($i / $count, 2);
          $image = wp_get_attachment_image( $id, 'large' );
          $output .= "<li class='layer' data-depth='{$depth}'>{$image}</li>";
        }
        return $output . '</ul></div>';
      }
      return wp_get_attachment_image( $ids[0], 'large' );
    }
    return '';
  }

  // The previous version of this plugin used post types...
  public static function update_plugin() {
    if ( ! get_option( 'wm-parallax-version' ) ) {
      register_post_type( 'parallax', array( 'public' => false ) );
      $effects = get_posts( array( 'numberposts' => -1, 'post_type' => 'parallax' ) );
      if ( ! empty( $effects ) ) {
        $old = $new = array();
        foreach ( $effects as $parallax ) {
          $attachments = get_posts( array(
            'numberposts' => -1,
            'post_type' => 'attachment',
            'post_mime_type' => 'image/png, image/gif',
            'post_parent' => $parallax->ID,
            'orderby' => 'menu_order',
            'exclude' => get_post_thumbnail_id( $parallax->ID )
          ) );
          $ids = array();
          foreach ( $attachments as $image ) { $ids[] = $image->ID; }
          $old[] = "/\[[\s]?parallax[\s]+id=[\"|\'][\s]?{$parallax->ID}[\s]?[\"|\'][\s]?\]/";
          $new[] = '[parallax ids="' . implode( ',', $ids ) . '"]';
        }
        $posts = get_posts( array( 'numberposts' => -1, 'post_type' => 'any' ) );
        foreach ( $posts as $post ) {
          $content = preg_replace( $old, $new, $post->post_content, -1, $count );
          if ( $count > 0 ) {
            wp_update_post( array( 'ID' => $post->ID, 'post_content' => $content ) );
          }
        }
      }
      $data = get_plugin_data( __FILE__, false );
      update_option( 'wm-parallax-version', $data['Version'] );
    }
  }
}
add_action( 'init', array( 'WM_Parallax', 'init' ) );