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Description

Add featured image as background image to post navigation elements.

Usage

twentyfifteen_post_nav_background();

Parameters

Returns

void

Source

File name: twentyfifteen/functions.php
Lines:

function twentyfifteen_post_nav_background() {
  if ( ! is_single() ) {
    return;
  }

  $previous = ( is_attachment() ) ? get_post( get_post()->post_parent ) : get_adjacent_post( false, '', true );
  $next     = get_adjacent_post( false, '', false );
  $css      = '';

  if ( is_attachment() && 'attachment' === $previous->post_type ) {
    return;
  }

  if ( $previous && has_post_thumbnail( $previous->ID ) ) {
    $prevthumb = wp_get_attachment_image_src( get_post_thumbnail_id( $previous->ID ), 'post-thumbnail' );
    $css      .= '
			.post-navigation .nav-previous { background-image: url(' . esc_url( $prevthumb[0] ) . '); }
			.post-navigation .nav-previous .post-title, .post-navigation .nav-previous a:hover .post-title, .post-navigation .nav-previous .meta-nav { color: #fff; }
			.post-navigation .nav-previous a:before { background-color: rgba(0, 0, 0, 0.4); }
		';
  }

  if ( $next && has_post_thumbnail( $next->ID ) ) {
    $nextthumb = wp_get_attachment_image_src( get_post_thumbnail_id( $next->ID ), 'post-thumbnail' );
    $css      .= '
			.post-navigation .nav-next { background-image: url(' . esc_url( $nextthumb[0] ) . '); border-top: 0; }
			.post-navigation .nav-next .post-title, .post-navigation .nav-next a:hover .post-title, .post-navigation .nav-next .meta-nav { color: #fff; }
			.post-navigation .nav-next a:before { background-color: rgba(0, 0, 0, 0.4); }
		';
  }

  wp_add_inline_style( 'twentyfifteen-style', $css );
}
 

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