Roots Sidebar Display

gistfile1.php

<?php

/*
 * Allows manual override on a per page/post basis
 * for the display of the Roots Sidebar
 *
 * Allows for filtering the post types that show the metabox
 *
 */

class roots_sidebar_class {

	public $slug = 'roots_sidebar_display';

	/**
	 * Hook into the appropriate actions when the class is constructed.
	 */
	public function __construct() {
		add_action( 'add_meta_boxes', array( $this, 'add_meta_box' ) );
		add_action( 'save_post', array( $this, 'save' ) );
		add_filter( 'roots/display_sidebar', array( $this, 'roots_sidebar_display_filter' ), 0 );
	}

	/**
	 * Adds the meta box container.
	 */
	public function add_meta_box( $post_type ) {
		$post_types = apply_filters( $this->slug . '_post_types',
			get_post_types(
				array(
					'public'  => true,
					'show_ui' => true
				)
			)
		);
		if ( in_array( $post_type, $post_types ) ) {
			add_meta_box(
				$this->slug
				, __( 'Select whether to show or hide sidebar', $this->slug )
				, array( $this, 'render_meta_box_content' )
				, $post_type
				, 'advanced'
				, 'high'
			);
		}
	}

	/**
	 * Save the meta when the post is saved.
	 *
	 * @param int $post_id The ID of the post being saved.
	 */
	public function save( $post_id ) {

		/*
		 * We need to verify this came from the our screen and with proper authorization,
		 * because save_post can be triggered at other times.
		 */

		// Check if our nonce is set.
		if ( ! isset( $_POST[ $this->slug . '_nonce' ] ) ) {
			return $post_id;
		}

		$nonce = $_POST[ $this->slug . '_nonce' ];

		// Verify that the nonce is valid.
		if ( ! wp_verify_nonce( $nonce, $this->slug ) ) {
			return $post_id;
		}

		// If this is an autosave, our form has not been submitted,
		//     so we don't want to do anything.
		if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
			return $post_id;
		}

		// Check the user's permissions.
		if ( 'page' == $_POST['post_type'] ) {

			if ( ! current_user_can( 'edit_page', $post_id ) ) {
				return $post_id;
			}

		} else {

			if ( ! current_user_can( 'edit_post', $post_id ) ) {
				return $post_id;
			}
		}

		/* OK, its safe for us to save the data now. */

		// Sanitize the user input.
		if ( ! isset( $_POST[ $this->slug ] ) ) {
			delete_post_meta( $post_id, '_' . $this->slug );

			return $post_id;
		}

		if ( empty( $_POST[ $this->slug ] ) ) {
			delete_post_meta( $post_id, '_' . $this->slug );

			return $post_id;
		}

		$display = sanitize_text_field( $_POST[ $this->slug ] );

		// Update the meta field.
		update_post_meta( $post_id, '_' . $this->slug, $display );
	}


	/**
	 * Render Meta Box content.
	 *
	 * @param WP_Post $post The post object.
	 */
	public function render_meta_box_content( $post ) {

		// Add an nonce field so we can check for it later.
		wp_nonce_field( $this->slug, $this->slug . '_nonce' );

		// Use get_post_meta to retrieve an existing value from the database.
		$display = get_post_meta( $post->ID, '_' . $this->slug, true );

		echo '<select name="' . $this->slug . '">';
		echo '<option value="">' . __( 'Make a choice, or leave at default', $this->slug ) . '</option>';
		echo '<option value="show" ' . selected( $display, 'show', false ) . '>' . __( 'Show sidebar', $this->slug ) . '</option>';
		echo '<option value="hide" ' . selected( $display, 'hide', false ) . '>' . __( 'Hide sidebar', $this->slug ) . '</option>';
		echo '</select>';
	}


	function roots_sidebar_display_filter( $sidebar ) {
		global $post;
		$display = get_post_meta( $post->ID, '_' . $this->slug, true );
		switch ( $display ) {
			case 'show':
				return true;
			case 'hide':
				return false;
			default:
				return $sidebar;
		}

		return $sidebar;
	}

}

new roots_sidebar_class;