class-gravityview-lightbox.php

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<?php

/**
 * Manage lightbox scripts for GravityView
 *
 * TODO: Add a global setting for lightbox providers
 * TODO: Add per-field settings
 *
 * @internal
 */
class GravityView_Lightbox {
    const DEFAULT_PROVIDER = 'fancybox';

    private static $providers = array();

    private static $active_provider = null;

    /**
     * GravityView_Lightbox_Provider constructor.
     */
    public function __construct() {
        require_once gravityview()->plugin->dir( 'includes/extensions/lightbox/class-gravityview-lightbox-provider.php' );
        require_once gravityview()->plugin->dir( 'includes/extensions/lightbox/fancybox/class-gravityview-lightbox-provider-fancybox.php' );

        add_action( 'plugins_loaded', array( $this, 'set_provider' ), 11 );

        add_action( 'gravityview/lightbox/provider', array( $this, 'set_provider' ) );
    }

    /**
     * Activate the lightbox provider chosen in settings
     *
     * @param string|null $provider GravityView_Lightbox_Provider::$slug of provider
     *
     * @internal
     *
     */
    public function set_provider( $provider = null ) {

        if( gravityview()->request->is_admin() ) {
            return;
        }

        if ( empty( $provider ) ) {
            $provider = gravityview()->plugin->settings->get( 'lightbox', self::DEFAULT_PROVIDER );
        }

        if ( empty( self::$providers[ $provider ] ) || ! class_exists( self::$providers[ $provider ] ) ) {
            gravityview()->log->error( 'Lightbox provider {provider} not registered.', array( 'provider' => $provider ) );
            return;
        }

        // Already set up.
        if ( self::$active_provider && self::$active_provider instanceof self::$providers[ $provider ] ) {
            return;
        }

        // We're switching providers; remove the hooks that were added.
        if( self::$active_provider ) {
            self::$active_provider->remove_hooks();
        }

        self::$active_provider = new self::$providers[ $provider ];

        self::$active_provider->add_hooks();
    }

    /**
     * Register lightbox providers
     *
     * @param $provider
     */
    public static function register( $provider ) {
        self::$providers[ $provider::$slug ] = $provider;
    }

}

new GravityView_Lightbox();