/wp-content/plugins/ml-slider/ml-slider.php

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<?php
/*
 * Meta Slider. Slideshow plugin for WordPress.
 *
 * Plugin Name: Meta Slider
 * Plugin URI:  http://www.metaslider.com
 * Description: Easy to use slideshow plugin. Create SEO optimised responsive slideshows with Nivo Slider, Flex Slider, Coin Slider and Responsive Slides.
 * Version:     2.9.1
 * Author:      Matcha Labs
 * Author URI:  http://www.matchalabs.com
 * License:     GPL-2.0+
 * Copyright:   2014 Matcha Labs LTD
 *
 * Text Domain: metaslider
 * Domain Path: /languages/
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit; // disable direct access
}

if ( ! class_exists( 'MetaSliderPlugin' ) ) :

/**
 * Register the plugin.
 *
 * Display the administration panel, insert JavaScript etc.
 */
class MetaSliderPlugin {

    /**
     * @var string
     */
    public $version = '2.9.1';


    /**
     * @var MetaSlider
     */
    public $slider = null;


    /**
     * Init
     */
    public static function init() {

        $metaslider = new self();

    }


    /**
     * Constructor
     */
    public function __construct() {

        $this->define_constants();
        $this->includes();
        $this->setup_actions();
        $this->setup_filters();
        $this->setup_shortcode();
        $this->register_slide_types();

    }


    /**
     * Define Meta Slider constants
     */
    private function define_constants() {

        define( 'METASLIDER_VERSION',    $this->version );
        define( 'METASLIDER_BASE_URL',   trailingslashit( plugins_url( 'ml-slider' ) ) );
        define( 'METASLIDER_ASSETS_URL', trailingslashit( METASLIDER_BASE_URL . 'assets' ) );
        define( 'METASLIDER_PATH',       plugin_dir_path( __FILE__ ) );

    }


    /**
     * All Meta Slider classes
     */
    private function plugin_classes() {

        return array(
            'metaslider'            => METASLIDER_PATH . 'inc/slider/metaslider.class.php',
            'metacoinslider'        => METASLIDER_PATH . 'inc/slider/metaslider.coin.class.php',
            'metaflexslider'        => METASLIDER_PATH . 'inc/slider/metaslider.flex.class.php',
            'metanivoslider'        => METASLIDER_PATH . 'inc/slider/metaslider.nivo.class.php',
            'metaresponsiveslider'  => METASLIDER_PATH . 'inc/slider/metaslider.responsive.class.php',
            'metaslide'             => METASLIDER_PATH . 'inc/slide/metaslide.class.php',
            'metaimageslide'        => METASLIDER_PATH . 'inc/slide/metaslide.image.class.php',
            'metasliderimagehelper' => METASLIDER_PATH . 'inc/metaslider.imagehelper.class.php',
            'metaslidersystemcheck' => METASLIDER_PATH . 'inc/metaslider.systemcheck.class.php',
            'metaslider_widget'     => METASLIDER_PATH . 'inc/metaslider.widget.class.php',
            'simple_html_dom'       => METASLIDER_PATH . 'inc/simple_html_dom.php'
        );

    }


    /**
     * Load required classes
     */
    private function includes() {

        $autoload_is_disabled = defined( 'METASLIDER_AUTOLOAD_CLASSES' ) && METASLIDER_AUTOLOAD_CLASSES === false;

        if ( function_exists( "spl_autoload_register" ) && ! ( $autoload_is_disabled ) ) {

            // >= PHP 5.2 - Use auto loading
            if ( function_exists( "__autoload" ) ) {
                spl_autoload_register( "__autoload" );
            }

            spl_autoload_register( array( $this, 'autoload' ) );

        } else {

            // < PHP5.2 - Require all classes
            foreach ( $this->plugin_classes() as $id => $path ) {
                if ( is_readable( $path ) && ! class_exists( $id ) ) {
                    require_once( $path );
                }
            }

        }

    }


    /**
     * Autoload Meta Slider classes to reduce memory consumption
     */
    public function autoload( $class ) {

        $classes = $this->plugin_classes();

        $class_name = strtolower( $class );

        if ( isset( $classes[$class_name] ) && is_readable( $classes[$class_name] ) ) {
            require_once( $classes[$class_name] );
        }

    }


    /**
     * Register the [metaslider] shortcode.
     */
    private function setup_shortcode() {

        add_shortcode( 'metaslider', array( $this, 'register_shortcode' ) );
        add_shortcode( 'ml-slider', array( $this, 'register_shortcode' ) ); // backwards compatibility

    }


    /**
     * Hook Meta Slider into WordPress
     */
    private function setup_actions() {

        add_action( 'admin_menu', array( $this, 'register_admin_menu' ), 9553 );
        add_action( 'init', array( $this, 'register_post_type' ) );
        add_action( 'init', array( $this, 'register_taxonomy' ) );
        add_action( 'init', array( $this, 'load_plugin_textdomain' ) );
        add_action( 'admin_footer', array( $this, 'admin_footer' ), 11 );
        add_action( 'media_upload_vimeo', array( $this, 'upgrade_to_pro_tab' ) );
        add_action( 'media_upload_youtube', array( $this, 'upgrade_to_pro_tab' ) );
        add_action( 'media_upload_post_feed', array( $this, 'upgrade_to_pro_tab' ) );
        add_action( 'media_upload_layer', array( $this, 'upgrade_to_pro_tab' ) );
        add_action( 'admin_post_metaslider_preview', array( $this, 'do_preview' ) );
        add_action( 'widgets_init', array( $this, 'register_metaslider_widget' ) );

        if ( defined( 'METASLIDER_ENABLE_RESOURCE_MANAGER' ) && METASLIDER_ENABLE_RESOURCE_MANAGER === true ) {

            add_action( 'template_redirect', array( $this, 'start_resource_manager'), 0 );

        }

    }


    /**
     * Hook Meta Slider into WordPress
     */
    private function setup_filters() {

        add_filter( 'media_upload_tabs', array( $this, 'custom_media_upload_tab_name' ), 998 );
        add_filter( 'media_view_strings', array( $this, 'custom_media_uploader_tabs' ), 5 );
        add_filter( 'media_buttons_context', array( $this, 'insert_metaslider_button' ) );

        // add 'go pro' link to plugin options
        $plugin = plugin_basename( __FILE__ );

        add_filter( "plugin_action_links_{$plugin}", array( $this, 'upgrade_to_pro_link' ) );

    }


    /**
     * Register Meta Slider widget
     */
    public function register_metaslider_widget() {

        register_widget( 'MetaSlider_Widget' );

    }


    /**
     * Register ML Slider post type
     */
    public function register_post_type() {

        register_post_type( 'ml-slider', array(
                'query_var' => false,
                'rewrite' => false,
                'public' => true,
                'exclude_from_search' => true,
                'publicly_queryable' => false,
                'show_in_nav_menus' => false,
                'show_ui' => false,
                'labels' => array(
                    'name' => 'Meta Slider'
                )
            )
        );

    }


    /**
     * Register taxonomy to store slider => slides relationship
     */
    public function register_taxonomy() {

        register_taxonomy( 'ml-slider', 'attachment', array(
                'hierarchical' => true,
                'public' => false,
                'query_var' => false,
                'rewrite' => false
            )
        );

    }


    /**
     * Register our slide types
     */
    private function register_slide_types() {

        $image = new MetaImageSlide();

    }


    /**
     * Add the menu page
     */
    public function register_admin_menu() {

        $title = apply_filters( 'metaslider_menu_title', "Meta Slider" );

        $page = add_menu_page( $title, $title, 'edit_others_posts', 'metaslider', array(
                $this, 'render_admin_page'
            ), METASLIDER_ASSETS_URL . 'metaslider/matchalabs.png', 9501 );

        // ensure our JavaScript is only loaded on the Meta Slider admin page
        add_action( 'admin_print_scripts-' . $page, array( $this, 'register_admin_scripts' ) );
        add_action( 'admin_print_styles-' . $page, array( $this, 'register_admin_styles' ) );
        add_action( 'load-' . $page, array( $this, 'help_tab' ) );

    }


    /**
     * Shortcode used to display slideshow
     *
     * @return string HTML output of the shortcode
     */
    public function register_shortcode( $atts ) {

        if ( !isset( $atts['id'] ) ) {
            return false;
        }

        // handle [metaslider id=123 restrict_to=home]
        if ( isset( $atts['restrict_to'] ) && $atts['restrict_to'] == 'home' && ! is_front_page() ) {
            return;
        }

        // we have an ID to work with
        $slider = get_post( $atts['id'] );

        // check the slider is published and the ID is correct
        if ( ! $slider || $slider->post_status != 'publish' || $slider->post_type != 'ml-slider' ) {
            return "<!-- meta slider {$atts['id']} not found -->";
        }

        // lets go
        $this->set_slider( $atts['id'], $atts );
        $this->slider->enqueue_scripts();

        return $this->slider->render_public_slides();

    }


    /**
     * Initialise translations
     */
    public function load_plugin_textdomain() {

        load_plugin_textdomain( 'metaslider', false, dirname( plugin_basename( __FILE__ ) ) . '/languages/' );

    }


    /**
     * Add the help tab to the screen.
     */
    public function help_tab() {

        $screen = get_current_screen();

        // documentation tab
        $screen->add_help_tab( array(
                'id'    => 'documentation',
                'title' => __( 'Documentation', 'metaslider' ),
                'content'   => "<p><a href='http://www.metaslider.com/documentation/' target='blank'>Meta Slider Documentation</a></p>",
            )
        );

    }


    /**
     * Rehister admin styles
     */
    public function register_admin_styles() {

        wp_enqueue_style( 'metaslider-admin-styles', METASLIDER_ASSETS_URL . 'metaslider/admin.css', false, METASLIDER_VERSION );
        wp_enqueue_style( 'metaslider-colorbox-styles', METASLIDER_ASSETS_URL . 'colorbox/colorbox.css', false, METASLIDER_VERSION );
        wp_enqueue_style( 'metaslider-tipsy-styles', METASLIDER_ASSETS_URL . 'tipsy/tipsy.css', false, METASLIDER_VERSION );
        
        do_action( 'metaslider_register_admin_styles' );

    }


    /**
     * Register admin JavaScript
     */
    public function register_admin_scripts() {

        // media library dependencies
        wp_enqueue_media();

        // plugin dependencies
        wp_enqueue_script( 'jquery-ui-core', array( 'jquery' ) );
        wp_enqueue_script( 'jquery-ui-sortable', array( 'jquery', 'jquery-ui-core' ) );
        wp_enqueue_script( 'metaslider-colorbox', METASLIDER_ASSETS_URL . 'colorbox/jquery.colorbox-min.js', array( 'jquery' ), METASLIDER_VERSION );
        wp_enqueue_script( 'metaslider-tipsy', METASLIDER_ASSETS_URL . 'tipsy/jquery.tipsy.js', array( 'jquery' ), METASLIDER_VERSION );
        wp_enqueue_script( 'metaslider-admin-script', METASLIDER_ASSETS_URL . 'metaslider/admin.js', array( 'jquery', 'metaslider-tipsy', 'media-upload' ), METASLIDER_VERSION );

        wp_dequeue_script( 'link' ); // WP Posts Filter Fix (Advanced Settings not toggling)
        wp_dequeue_script( 'ai1ec_requirejs' ); // All In One Events Calendar Fix (Advanced Settings not toggling)

        $this->localize_admin_scripts();

        do_action( 'metaslider_register_admin_scripts' );

    }


    /**
     * Localise admin script
     */
    public function localize_admin_scripts() {

        wp_localize_script( 'metaslider-admin-script', 'metaslider', array(
                'url' => __( "URL", "metaslider" ),
                'caption' => __( "Caption", "metaslider" ),
                'new_window' => __( "New Window", "metaslider" ),
                'confirm' => __( "Are you sure?", "metaslider" ),
                'ajaxurl' => admin_url( 'admin-ajax.php' ),
                'resize_nonce' => wp_create_nonce( 'metaslider_resize' ),
                'addslide_nonce' => wp_create_nonce( 'metaslider_addslide' ),
                'iframeurl' => admin_url( 'admin-post.php?action=metaslider_preview' ),
                'useWithCaution' => __( "Caution: This setting is for advanced developers only. If you're unsure, leave it checked.", "metaslider" )
            )
        );

    }


    /**
     * Outputs a blank page containing a slideshow preview (for use in the 'Preview' iFrame)
     */
    public function do_preview() {

        remove_action('wp_footer', 'wp_admin_bar_render', 1000);

        if ( isset( $_GET['slider_id'] ) && absint( $_GET['slider_id'] ) > 0 ) {
            $id = absint( $_GET['slider_id'] );

            echo "<!DOCTYPE html>";
            echo "<html><head>";
            echo "<style>body, html { overflow: hidden; margin: 0; padding: 0; }</style>";
            echo "</head><body>";
            echo do_shortcode("[metaslider id={$id}]");
            wp_footer();
            echo "</body></html>";
        }

        die();

    }


    /**
     * Check our WordPress installation is compatible with Meta Slider
     */
    public function do_system_check() {

        $systemCheck = new MetaSliderSystemCheck();
        $systemCheck->check();

    }


    /**
     * Update the tab options in the media manager
     */
    public function custom_media_uploader_tabs( $strings ) {

        //update strings
        if ( ( isset( $_GET['page'] ) && $_GET['page'] == 'metaslider' ) ) {
            $strings['insertMediaTitle'] = __( "Image", "metaslider" );
            $strings['insertIntoPost'] = __( "Add to slider", "metaslider" );
            // remove options
            if ( isset( $strings['createGalleryTitle'] ) ) unset( $strings['createGalleryTitle'] );
            if ( isset( $strings['insertFromUrlTitle'] ) ) unset( $strings['insertFromUrlTitle'] );
        }

        return $strings;

    }


    /**
     * Add extra tabs to the default wordpress Media Manager iframe
     *
     * @var array existing media manager tabs
     */
    public function custom_media_upload_tab_name( $tabs ) {

        $metaslider_tabs = array( 'post_feed', 'layer', 'youtube', 'vimeo' );

        // restrict our tab changes to the meta slider plugin page
        if ( ( isset( $_GET['page'] ) && $_GET['page'] == 'metaslider' ) || ( isset( $_GET['tab'] ) && in_array( $_GET['tab'], $metaslider_tabs ) ) ) {
            $newtabs = array();

            if ( function_exists( 'is_plugin_active' ) && ! is_plugin_active( 'ml-slider-pro/ml-slider-pro.php' ) ) {
                $newtabs = array(
                    'post_feed' => __( "Post Feed", "metaslider" ),
                    'vimeo' => __( "Vimeo", "metaslider" ),
                    'youtube' => __( "YouTube", "metaslider" ),
                    'layer' => __( "Layer Slide", "metaslider" )
                );
            }

            if ( isset( $tabs['nextgen'] ) ) 
                unset( $tabs['nextgen'] );


            if ( is_array( $tabs ) ) {
                return array_merge( $tabs, $newtabs );
            } else {
                return $newtabs;
            }
            
        }

        return $tabs;

    }


    /**
     * Set the current slider
     */
    public function set_slider( $id, $shortcode_settings = array() ) {

        $type = 'flex';

        if ( isset( $shortcode_settings['type'] ) ) {
            $type = $shortcode_settings['type'];
        } else if ( $settings = get_post_meta( $id, 'ml-slider_settings', true ) ) {
            if ( is_array( $settings ) && isset( $settings['type'] ) ) {
                $type = $settings['type'];
            }
        }

        if ( ! in_array( $type, array( 'flex', 'coin', 'nivo', 'responsive' ) ) ) {
            $type = 'flex';
        }

        $this->slider = $this->create_slider( $type, $id, $shortcode_settings );

    }


    /**
     * Create a new slider based on the sliders type setting
     */
    private function create_slider( $type, $id, $shortcode_settings ) {

        switch ( $type ) {
            case( 'coin' ):
                return new MetaCoinSlider( $id, $shortcode_settings );
            case( 'flex' ):
                return new MetaFlexSlider( $id, $shortcode_settings );
            case( 'nivo' ):
                return new MetaNivoSlider( $id, $shortcode_settings );
            case( 'responsive' ):
                return new MetaResponsiveSlider( $id, $shortcode_settings );
            default:
                return new MetaFlexSlider( $id, $shortcode_settings );

        }
    }


    /**
     * Handle slide uploads/changes.
     */
    public function admin_process() {

        // this function should only ever be called from the Meta Slider admin page.
        if ( ! is_admin() ) {
            return;
        }

        // handle switching view
        if ( isset( $_GET['view'] ) ) {
            $this->switch_view();
        }

        // default to the latest slider
        $slider_id = $this->find_slider( 'modified', 'DESC' );

        // delete a slider
        if ( isset( $_GET['delete'] ) ) {
            $slider_id = $this->delete_slider( absint( $_GET['delete'] ) );
        }

        // load a slider by ID
        if ( isset( $_REQUEST['id'] ) ) {
            $temp_id = absint( $_REQUEST['id'] );

            // check valid post ID
            if ( get_post( $temp_id ) ) {
                $slider_id = $temp_id;
            }
        }

        // create a new slider
        if ( isset( $_GET['add'] ) ) {
            $slider_id = $this->add_slider();
        }

        // finally, set the slider
        if ( $slider_id > 0 ) {
            $this->set_slider( $slider_id );
        }

    }

    /**
     *
     */
    private function switch_view() {
        global $user_ID;

        $view = $_GET['view'];

        $allowed_views = array('tabs', 'dropdown');

        if ( ! in_array( $view, $allowed_views ) ) {
            return;
        }

        delete_user_meta( $user_ID, "metaslider_view" );

        if ( $view == 'dropdown' ) {
            add_user_meta( $user_ID, "metaslider_view", "dropdown");
        }

    }

    /**
     * Create a new slider
     */
    private function add_slider() {

        // check nonce
        check_admin_referer( "metaslider_add_slider" );

        $defaults = array();

        // if possible, take a copy of the last edited slider settings in place of default settings
        if ( $last_modified = $this->find_slider( 'modified', 'DESC' ) ) {
            $defaults = get_post_meta( $last_modified, 'ml-slider_settings', true );
        }

        // insert the post
        $id = wp_insert_post( array(
                'post_title' => __( "New Slider", "metaslider" ),
                'post_status' => 'publish',
                'post_type' => 'ml-slider'
            )
        );

        // use the default settings if we can't find anything more suitable.
        if ( empty( $defaults ) ) {
            $slider = new MetaSlider( $id, array() );
            $defaults = $slider->get_default_parameters();
        }

        // insert the post meta
        add_post_meta( $id, 'ml-slider_settings', $defaults, true );

        // create the taxonomy term, the term is the ID of the slider itself
        wp_insert_term( $id, 'ml-slider' );

        return $id;

    }


    /**
     * Delete a slider (send it to trash)
     *
     * @param int $id
     */
    private function delete_slider( $id ) {

        // check nonce
        check_admin_referer( "metaslider_delete_slider" );

        // send the post to trash
        wp_update_post( array(
                'ID' => $id,
                'post_status' => 'trash'
            )
        );

        return $this->find_slider( 'date', 'DESC' );

    }


    /**
     * Find a single slider ID. For example, last edited, or first published.
     *
     * @param string $orderby field to order.
     * @param string $order direction (ASC or DESC).
     * @return int slider ID.
     */
    private function find_slider( $orderby, $order ) {

        $args = array(
            'force_no_custom_order' => true,
            'post_type' => 'ml-slider',
            'num_posts' => 1,
            'post_status' => 'publish',
            'suppress_filters' => 1, // wpml, ignore language filter
            'orderby' => $orderby,
            'order' => $order
        );

        $the_query = new WP_Query( $args );

        while ( $the_query->have_posts() ) {
            $the_query->the_post();
            return $the_query->post->ID;
        }

        wp_reset_query();

        return false;

    }


    /**
     * Get sliders. Returns a nicely formatted array of currently
     * published sliders.
     *
     * @param string $sort_key
     * @return array all published sliders
     */
    private function all_meta_sliders( $sort_key = 'date' ) {

        $sliders = false;

        // list the tabs
        $args = array(
            'post_type' => 'ml-slider',
            'post_status' => 'publish',
            'orderby' => $sort_key,
            'suppress_filters' => 1, // wpml, ignore language filter
            'order' => 'ASC',
            'posts_per_page' => -1
        );

        $args = apply_filters( 'metaslider_all_meta_sliders_args', $args );

        $the_query = new WP_Query( $args );

        while ( $the_query->have_posts() ) {
            $the_query->the_post();
            $active = $this->slider && ( $this->slider->id == $the_query->post->ID ) ? true : false;

            $sliders[] = array(
                'active' => $active,
                'title' => get_the_title(),
                'id' => $the_query->post->ID
            );
        }

        wp_reset_query();

        return $sliders;

    }


    /**
     * Compare array values
     *
     * @param array $elem1
     * @param array $elem2
     * @return bool
     */
    private function compare_elems( $elem1, $elem2 ) {

        return $elem1['priority'] > $elem2['priority'];

    }


    /**
     *
     * @param array $aFields - array of field to render
     * @return string
     */
    public function build_settings_rows( $aFields ) {

        // order the fields by priority
        uasort( $aFields, array( $this, "compare_elems" ) );

        $return = "";

        // loop through the array and build the settings HTML
        foreach ( $aFields as $id => $row ) {
            // checkbox input type
            if ( $row['type'] == 'checkbox' ) {
                $return .= "<tr><td class='tipsy-tooltip' title=\"{$row['helptext']}\">{$row['label']}</td><td><input class='option {$row['class']} {$id}' type='checkbox' name='settings[{$id}]' {$row['checked']} />";

                if ( isset( $row['after'] ) ) {
                    $return .= "<span class='after'>{$row['after']}</span>";
                }

                $return .= "</td></tr>";
            }

            // navigation row
            if ( $row['type'] == 'navigation' ) {
                $navigation_row = "<tr class='{$row['type']}'><td class='tipsy-tooltip' title=\"{$row['helptext']}\">{$row['label']}</td><td><ul>";

                foreach ( $row['options'] as $k => $v ) {

                    if ( $row['value'] === true && $k === 'true' ) {
                        $checked = checked( true, true, false );
                    } else if ( $row['value'] === false && $k === 'false' ) {
                        $checked = checked( true, true, false );
                    } else {
                        $checked = checked( $k, $row['value'], false );
                    }

                    $disabled = $k == 'thumbnails' ? 'disabled' : '';
                    $navigation_row .= "<li><label><input type='radio' name='settings[{$id}]' value='{$k}' {$checked} {$disabled}/>{$v['label']}</label></li>";
                }

                $navigation_row .= "</ul></td></tr>";

                $return .= apply_filters( 'metaslider_navigation_options', $navigation_row, $this->slider );
            }

            // navigation row
            if ( $row['type'] == 'radio' ) {
                $navigation_row = "<tr class='{$row['type']}'><td class='tipsy-tooltip' title=\"{$row['helptext']}\">{$row['label']}</td><td><ul>";

                foreach ( $row['options'] as $k => $v ) {
                    $checked = checked( $k, $row['value'], false );
                    $class = isset( $v['class'] ) ? $v['class'] : "";
                    $navigation_row .= "<li><label><input type='radio' name='settings[{$id}]' value='{$k}' {$checked} class='radio {$class}'/>{$v['label']}</label></li>";
                }

                $navigation_row .= "</ul></td></tr>";

                $return .= apply_filters( 'metaslider_navigation_options', $navigation_row, $this->slider );
            }

            // header/divider row
            if ( $row['type'] == 'divider' ) {
                $return .= "<tr class='{$row['type']}'><td colspan='2' class='divider'><b>{$row['value']}</b></td></tr>";
            }

            // slideshow select row
            if ( $row['type'] == 'slider-lib' ) {
                $return .= "<tr class='{$row['type']}'><td colspan='2' class='slider-lib-row'>";

                foreach ( $row['options'] as $k => $v ) {
                    $checked = checked( $k, $row['value'], false );
                    $return .= "<input class='select-slider' id='{$k}' rel='{$k}' type='radio' name='settings[type]' value='{$k}' {$checked} />
                    <label for='{$k}'>{$v['label']}</label>";
                }

                $return .= "</td></tr>";
            }

            // number input type
            if ( $row['type'] == 'number' ) {
                $return .= "<tr class='{$row['type']}'><td class='tipsy-tooltip' title=\"{$row['helptext']}\">{$row['label']}</td><td><input class='option {$row['class']} {$id}' type='number' min='{$row['min']}' max='{$row['max']}' step='{$row['step']}' name='settings[{$id}]' value='{$row['value']}' /><span class='after'>{$row['after']}</span></td></tr>";
            }

            // select drop down
            if ( $row['type'] == 'select' ) {
                $return .= "<tr class='{$row['type']}'><td class='tipsy-tooltip' title=\"{$row['helptext']}\">{$row['label']}</td><td><select class='option {$row['class']} {$id}' name='settings[{$id}]'>";
                foreach ( $row['options'] as $k => $v ) {
                    $selected = selected( $k, $row['value'], false );
                    $return .= "<option class='{$v['class']}' value='{$k}' {$selected}>{$v['label']}</option>";
                }
                $return .= "</select></td></tr>";
            }

            // theme drop down
            if ( $row['type'] == 'theme' ) {
                $return .= "<tr class='{$row['type']}'><td class='tipsy-tooltip' title=\"{$row['helptext']}\">{$row['label']}</td><td><select class='option {$row['class']} {$id}' name='settings[{$id}]'>";
                $themes = "";

                foreach ( $row['options'] as $k => $v ) {
                    $selected = selected( $k, $row['value'], false );
                    $themes .= "<option class='{$v['class']}' value='{$k}' {$selected}>{$v['label']}</option>";
                }

                $return .= apply_filters( 'metaslider_get_available_themes', $themes, $this->slider->get_setting( 'theme' ) );

                $return .= "</select></td></tr>";
            }

            // text input type
            if ( $row['type'] == 'text' ) {
                $return .= "<tr class='{$row['type']}'><td class='tipsy-tooltip' title=\"{$row['helptext']}\">{$row['label']}</td><td><input class='option {$row['class']} {$id}' type='text' name='settings[{$id}]' value='{$row['value']}' /></td></tr>";
            }

            // text input type
            if ( $row['type'] == 'textarea' ) {
                $return .= "<tr class='{$row['type']}'><td class='tipsy-tooltip' title=\"{$row['helptext']}\" colspan='2'>{$row['label']}</td></tr><tr><td colspan='2'><textarea class='option {$row['class']} {$id}' name='settings[{$id}]' />{$row['value']}</textarea></td></tr>";
            }

            // text input type
            if ( $row['type'] == 'title' ) {
                $return .= "<tr class='{$row['type']}'><td class='tipsy-tooltip' title=\"{$row['helptext']}\">{$row['label']}</td><td><input class='option {$row['class']} {$id}' type='text' name='{$id}' value='{$row['value']}' /></td></tr>";
            }
        }

        return $return;

    }


    /**
     * Return an indexed array of all easing options
     *
     * @return array
     */
    private function get_easing_options() {

        $options = array(
            'linear', 'swing', 'jswing', 'easeInQuad', 'easeOutQuad', 'easeInOutQuad',
            'easeInCubic', 'easeOutCubic', 'easeInOutCubic', 'easeInQuart',
            'easeOutQuart', 'easeInOutQuart', 'easeInQuint', 'easeOutQuint',
            'easeInOutQuint', 'easeInSine', 'easeOutSine', 'easeInOutSine',
            'easeInExpo', 'easeOutExpo', 'easeInOutExpo', 'easeInCirc', 'easeOutCirc',
            'easeInOutCirc', 'easeInElastic', 'easeOutElastic', 'easeInOutElastic',
            'easeInBack', 'easeOutBack', 'easeInOutBack', 'easeInBounce', 'easeOutBounce',
            'easeInOutBounce'
        );

        foreach ( $options as $option ) {
            $return[$option] = array(
                'label' => ucfirst( preg_replace( '/(\w+)([A-Z])/U', '\\1 \\2', $option ) ),
                'class' => ''
            );
        }

        return $return;

    }

    /**
     * Output the slideshow selector.
     *
     * Show tabs or a dropdown list depending on the users saved preference.
     */
    public function print_slideshow_selector() {
        global $user_ID;

        $add_url = wp_nonce_url( "?page=metaslider&amp;add=true", "metaslider_add_slider" );

        if ( $tabs = $this->all_meta_sliders() ) {

            if ( $this->get_view() == 'tabs' ) {

                echo "<div style='display: none;' id='screen-options-switch-view-wrap'><a class='switchview dashicons-before dashicons-welcome-view-site' href='?page=metaslider&amp;view=dropdown'>" . __("Switch to Dropdown view", "metaslider") . "</a></div>";

                echo "<h3 class='nav-tab-wrapper'>";

                foreach ( $tabs as $tab ) {

                    if ( $tab['active'] ) {
                        echo "<div class='nav-tab nav-tab-active'><input type='text' name='title'  value='" . $tab['title'] . "' onfocus='this.style.width = ((this.value.length + 1) * 9) + \"px\"' /></div>";
                    } else {
                        echo "<a href='?page=metaslider&amp;id={$tab['id']}' class='nav-tab'>" . $tab['title'] . "</a>";
                    }

                }

                echo "<a href='{$add_url}' id='create_new_tab' class='nav-tab'>+</a>";
                echo "</h3>";

            } else {

                if ( isset( $_GET['add'] ) && $_GET['add'] == 'true' ) {

                    echo "<div id='message' class='updated'><p>" . __( "New slideshow created. Click 'Add Slide' to get started!", "metaslider" ) . "</p></div>";
                
                }
                
                echo "<div style='display: none;' id='screen-options-switch-view-wrap'><a class='switchview dashicons-before dashicons-welcome-view-site' href='?page=metaslider&amp;view=tabs'>" . __("Switch to Tab view", "metaslider") . "</a></div>";

                echo "<div class='dropdown_container'><label for='select-slider'>" . __("Select Slider", "metaslider") . ": </label>";
                echo "<select name='select-slider' onchange='if (this.value) window.location.href=this.value'>";

                $tabs = $this->all_meta_sliders( 'title' );

                foreach ( $tabs as $tab ) {

                    $selected = $tab['active'] ? " selected" : "";

                    if ( $tab['active'] ) {

                        $title = $tab['title'];

                    }

                    echo "<option value='?page=metaslider&amp;id={$tab['id']}'{$selected}>{$tab['title']}</option>";

                }

                echo "</select> " . __( 'or', "metaslider" ) . " ";
                echo "<a href='{$add_url}'>" . __( 'Add New Slideshow', "metaslider" ) . "</a></div>";

            }
        } else {
            echo "<h3 class='nav-tab-wrapper'>";
            echo "<a href='{$add_url}' id='create_new_tab' class='nav-tab'>+</a>";
            echo "<div class='bubble'>" . __( "Create your first slideshow", "metaslider" ) . "</div>";
            echo "</h3>";
        }
    }


    /**
     * Return the users saved view preference.
     */
    public function get_view() {
        global $user_ID;

        if ( get_user_meta( $user_ID, "metaslider_view", true ) ) {
            return get_user_meta( $user_ID, "metaslider_view", true );
        }

        return 'tabs';
    }


    /**
     * Render the admin page (tabs, slides, settings)
     */
    public function render_admin_page() {
        
        $this->admin_process();
        $this->upgrade_to_pro_cta();
        $this->do_system_check();

        $slider_id = $this->slider ? $this->slider->id : 0;

        ?>

        <script type='text/javascript'>
            var metaslider_slider_id = <?php echo $slider_id; ?>;
            var metaslider_pro_active = <?php echo function_exists( 'is_plugin_active' ) && is_plugin_active( 'ml-slider-pro/ml-slider-pro.php' ) ? 'true' : 'false' ?>;
        </script>

        <div class="wrap metaslider">
            <form accept-charset="UTF-8" action="?page=metaslider&amp;id=<?php echo $slider_id ?>" method="post">
                <?php
                    if ( $this->slider ) {
                        wp_nonce_field( 'metaslider_save_' . $this->slider->id );
                    }

                    $this->print_slideshow_selector();

                    if ( ! $this->slider ) {
                        return;
                    }
                ?>
                <div id='poststuff'>
                    <div id='post-body' class='metabox-holder columns-2'>

                        <div id='post-body-content'>
                            <div class="left">
                                <table class="widefat sortable">
                                    <thead>
                                        <tr>
                                            <th style="width: 100px;">
                                                <h3><?php _e( "Slides", "metaslider" ) ?></h3>
                                            </th>
                                            <th>
                                                <a href='#' class='button alignright add-slide' data-editor='content' title='<?php _e( "Add Slide", "metaslider" ) ?>'>
                                                    <span class='wp-media-buttons-icon'></span> <?php _e( "Add Slide", "metaslider" ) ?>
                                                </a>
                                            </th>
                                        </tr>
                                    </thead>

                                    <tbody>
                                        <?php
                                            $this->slider->render_admin_slides();
                                        ?>
                                    </tbody>
                                </table>
                            </div>
                        </div>

                        <div id="postbox-container-1" class="postbox-container">
                            <div id="side-sortables" class="meta-box-sortables">
                                <div class='right'>
                                    <div class="ms-postbox" id="metaslider_configuration">
                                        <h3 class='configuration'>
                                            <?php _e( "Settings", "metaslider" ) ?>
                                            <input class='alignright button button-primary' type='submit' name='save' id='ms-save' value='<?php _e( "Save", "metaslider" ) ?>' />
                                            <input class='alignright button button-primary' type='submit' name='preview' id='ms-preview' value='<?php _e( "Save & Preview", "metaslider" ) ?>' data-slider_id='<?php echo $this->slider->id ?>' data-slider_width='<?php echo $this->slider->get_setting( 'width' ) ?>' data-slider_height='<?php echo $this->slider->get_setting( 'height' ) ?>' />
                                            <span class="spinner"></span>
                                        </h3>
                                        <div class="inside">
                                            <table class="widefat settings">
                                                <tbody>
                                                    <?php
                                                        $aFields = array(
                                                            'type' => array(
                                                                'priority' => 0,
                                                                'type' => 'slider-lib',
                                                                'value' => $this->slider->get_setting( 'type' ),
                                                                'options' => array(
                                                                    'flex'       => array( 'label' => __( "Flex Slider", "metaslider" ) ),
                                                                    'responsive' => array( 'label' => __( "R. Slides", "metaslider" ) ),
                                                                    'nivo'       => array( 'label' => __( "Nivo Slider", "metaslider" ) ),
                                                                    'coin'       => array( 'label' => __( "Coin Slider", "metaslider" ) )
                                                                )
                                                            ),
                                                            'width' => array(
                                                                'priority' => 10,
                                                                'type' => 'number',
                                                                'size' => 3,
                                                                'min' => 0,
                                                                'max' => 9999,
                                                                'step' => 1,
                                                                'value' => $this->slider->get_setting( 'width' ),
                                                                'label' => __( "Width", "metaslider" ),
                                                                'class' => 'coin flex responsive nivo',
                                                                'helptext' => __( "Slideshow width", "metaslider" ),
                                                                'after' => __( "px", "metaslider" )
                                                            ),
                                                            'height' => array(
                                                                'priority' => 20,
                                                                'type' => 'number',
                                                                'size' => 3,
                                                                'min' => 0,
                                                                'max' => 9999,
                                                                'step' => 1,
                                                                'value' => $this->slider->get_setting( 'height' ),
                                                                'label' => __( "Height", "metaslider" ),
                                                                'class' => 'coin flex responsive nivo',
                                                                'helptext' => __( "Slideshow height", "metaslider" ),
                                                                'after' => __( "px", "metaslider" )
                                                            ),
                                                            'effect' => array(
                                                                'priority' => 30,
                                                                'type' => 'select',
                                                                'value' => $this->slider->get_setting( 'effect' ),
                                                                'label' => __( "Effect", "metaslider" ),
                                                                'class' => 'effect coin flex responsive nivo',
                                                                'helptext' => __( "Slide transition effect", "metaslider" ),
                                                                'options' => array(
                                                                    'random'             => array( 'class' => 'option coin nivo' , 'label' => __( "Random", "metaslider" ) ),
                                                                    'swirl'              => array( 'class' => 'option coin', 'label' => __( "Swirl", "metaslider" ) ),
                                                                    'rain'               => array( 'class' => 'option coin', 'label' => __( "Rain", "metaslider" ) ),
                                                                    'straight'           => array( 'class' => 'option coin', 'label' => __( "Straight", "metaslider" ) ),
                                                                    'sliceDown'          => array( 'class' => 'option nivo', 'label' => __( "Slide Down", "metaslider" ) ),
                                                                    'sliceUp'            => array( 'class' => 'option nivo', 'label' => __( "Slice Up", "metaslider" ) ),
                                                                    'sliceUpLeft'        => array( 'class' => 'option nivo', 'label' => __( "Slide Up Left", "metaslider" ) ),
                                                                    'sliceUpDown'        => array( 'class' => 'option nivo', 'label' => __( "Slice Up Down", "metaslider" ) ),
                                                                    'slideUpDownLeft'    => array( 'class' => 'option nivo', 'label' => __( "Slide Up Down Left", "metaslider" ) ),
                                                                    'fold'               => array( 'class' => 'option nivo', 'label' => __( "Fold", "metaslider" ) ),
                                                                    'fade'               => array( 'class' => 'option nivo flex responsive', 'label' => __( "Fade", "metaslider" ) ),
                                                                    'slideInRight'       => array( 'class' => 'option nivo', 'label' => __( "Slide In Right", "metaslider" ) ),
                                                                    'slideInLeft'        => array( 'class' => 'option nivo', 'label' => __( "Slide In Left", "metaslider" ) ),
                                                                    'boxRandom'          => array( 'class' => 'option nivo', 'label' => __( "Box Random", "metaslider" ) ),
                                                                    'boxRain'            => array( 'class' => 'option nivo', 'label' => __( "Box Rain", "metaslider" ) ),
                                                                    'boxRainReverse'     => array( 'class' => 'option nivo', 'label' => __( "Box Rain Reverse", "metaslider" ) ),
                                                                    'boxRainGrowReverse' => array( 'class' => 'option nivo', 'label' => __( "Box Rain Grow Reverse", "metaslider" ) ),
                                                                    'slide'              => array( 'class' => 'option flex', 'label' => __( "Slide", "metaslider" ) )
                                                                ),
                                                            ),
                                                            'theme' => array(
                                                                'priority' => 40,
                                                                'type' => 'theme',
                                                                'value' => $this->slider->get_setting( 'theme' ),
                                                                'label' => __( "Theme", "metaslider" ),
                                                                'class' => 'effect coin flex responsive nivo',
                                                                'helptext' => __( "Slideshow theme", "metaslider" ),
                                                                'options' => array(
                                                                    'default' => array( 'class' => 'option nivo flex coin responsive' , 'label' => __( "Default", "metaslider" ) ),
                                                                    'dark'    => array( 'class' => 'option nivo', 'label' => __( "Dark (Nivo)", "metaslider" ) ),
                                                                    'light'   => array( 'class' => 'option nivo', 'label' => __( "Light (Nivo)", "metaslider" ) ),
                                                                    'bar'     => array( 'class' => 'option nivo', 'label' => __( "Bar (Nivo)", "metaslider" ) ),
                                                                ),
                                                            ),
                                                            'links' => array(
                                                                'priority' => 50,
                                                                'type' => 'checkbox',
                                                                'label' => __( "Arrows", "metaslider" ),
                                                                'class' => 'option coin flex nivo responsive',
                                                                'checked' => $this->slider->get_setting( 'links' ) == 'true' ? 'checked' : '',
                                                                'helptext' => __( "Show the previous/next arrows", "metaslider" )
                                                            ),
                                                            'navigation' => array(
                                                                'priority' => 60,
                                                                'type' => 'navigation',
                                                                'label' => __( "Navigation", "metaslider" ),
                                                                'class' => 'option coin flex nivo responsive',
                                                                'value' => $this->slider->get_setting( 'navigation' ),
                                                                'helptext' => __( "Show the slide navigation bullets", "metaslider" ),
                                                                'options' => array(
                                                                    'false'      => array( 'label' => __( "Hidden", "metaslider" ) ),
                                                                    'true'       => array( 'label' => __( "Dots", "metaslider" ) ),
                                                                )
                                                            ),
                                                        );

                                                        if ( $this->get_view() == 'dropdown' ) {
                                                            $aFields['title'] = array(
                                                                'type' => 'title',
                                                                'priority' => 5,
                                                                'class' => 'option flex nivo responsive coin',
                                                                'value' => get_the_title($this->slider->id),
                                                                'label' => __( "Title", "metaslider" ),
                                                                'helptext' => __( "Slideshow title", "metaslider" )
                                                            );
                                                        }

                                                        $aFields = apply_filters( 'metaslider_basic_settings', $aFields, $this->slider );

                                                        echo $this->build_settings_rows( $aFields );
                                                    ?>
                                                </tbody>
                                            </table>
                                        </div>
                                    </div>

                                    <div class="ms-postbox ms-toggle closed" id="metaslider_advanced_settings">
                                        <div class="handlediv" title="Click to toggle"><br></div><h3 class="hndle"><span><?php _e( "Advanced Settings", "metaslider" ) ?></span></h3>
                                        <div class="inside">
                                            <table>
                                                <tbody>
                                                    <?php
                                                        $aFields = array(
               …

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