felixarntz/theme-boilerplate

<?php
/**
 * Super_Awesome_Theme_Distraction_Free_Mode class
 *
 * @package Super_Awesome_Theme
 * @license GPL-2.0-or-later
 * @link    https://super-awesome-author.org/themes/super-awesome-theme/
 */

/**
 * Class managing distraction-free mode.
 *
 * @since 1.0.0
 */
final class Super_Awesome_Theme_Distraction_Free_Mode extends Super_Awesome_Theme_Theme_Component_Base {

    /**
     * Internal flag to store whether the current page is in distraction-free mode.
     *
     * @since 1.0.0
     * @var bool|null
     */
    private $is_distraction_free = null;

    /**
     * Checks whether the current page should be displayed in distraction-free mode.
     *
     * @since 1.0.0
     *
     * @return bool True if the current page should be displayed in distraction-free mode, false otherwise.
     */
    public function is_distraction_free() {
        if ( null !== $this->is_distraction_free ) {
            return $this->is_distraction_free;
        }

        $result = false;

        if ( is_page_template( 'templates/landing-page.php' ) ) {
            $result = true;
        } elseif ( is_page_template( 'templates/login.php' ) ) {
            $result = true;
        } elseif ( 'wp-signup.php' === $GLOBALS['pagenow'] ) {
            $result = true;
        } elseif ( 'wp-activate.php' === $GLOBALS['pagenow'] ) {
            $result = true;
        }

        /**
         * Filters whether the current page should be displayed in distraction-free mode.
         *
         * @since 1.0.0
         *
         * @param bool $result Whether to display the page in distraction-free mode. Default depends on the page template.
         */
        $this->is_distraction_free = apply_filters( 'super_awesome_theme_is_distraction_free', $result );

        return $this->is_distraction_free;
    }

    /**
     * Magic call method.
     *
     * Handles the widgets registration action hook callbacks.
     *
     * @since 1.0.0
     *
     * @param string $method Method name.
     * @param array  $args   Method arguments.
     *
     * @throws BadMethodCallException Thrown when method name is invalid.
     */
    public function __call( $method, $args ) {
        if ( 'add_distraction_free_body_class' === $method ) {
            if ( empty( $args ) ) {
                return;
            }

            $classes = $args[0];

            if ( $this->is_distraction_free() ) {
                $classes[] = 'is-distraction-free';
            }

            return $classes;
        }

        /* translators: %s: method name */
        throw new BadMethodCallException( sprintf( __( 'Call to undefined method %s', 'super-awesome-theme' ), __CLASS__ . '::' . $method . '()' ) );
    }

    /**
     * Adds hooks and runs other processes required to initialize the component.
     *
     * @since 1.0.0
     */
    protected function run_initialization() {
        add_filter( 'body_class', array( $this, 'add_distraction_free_body_class' ), 10, 1 );
    }
}