bw_background() – Implement [bw_background] shortcode

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Description

Displays an attached media image as the background image for the article Rather than displaying the image as a link we generate the CSS instead. This is slightly easier than using custom CSS since the author doesn't have to find the full URL of the file manually.

Usage

$string = bw_background( $atts, $content, $tag );

Parameters

$atts

( array ) optional – shortcode parameters

$content

( string ) optional – not expected

$tag

( string ) optional – the shortcode tag

Returns

Source

function bw_background( $atts=null, $content=null, $tag=null ) {
  $atts['post_type'] = bw_array_get( $atts, "post_type", "attachment" );
  $atts['post_mime_type'] = bw_array_get( $atts, 'post_mime_type', 'image' );
  $atts['id'] = bw_array_get_from( $atts, "id,0", null );
  if ( $atts['id'] === null ) {
    // Don't set the ID yet.. let get_thumbnail_src do it.
  }
  $atts['thumbnail'] = bw_array_get( $atts, "thumbnail", "full" );
  oik_require( "includes/bw_posts.php" );
  $thumbnail = bw_get_thumbnail_size( $atts );
  //$posts = bw_get_posts();
  //foreach ( $posts as $post ) {
  bw_trace2( $thumbnail, "thumbnail" );
    list( $thumbnail, $width, $height ) = bw_get_thumbnail_src( $atts['id'], $thumbnail, $atts );
    if ( $thumbnail ) {
      $selector = bw_array_get_from( $atts, "selector,1", null );
      if ( !$selector ) {
        $selector = bw_default_selector_for_theme();
      } 
      stag( "style", null, null, kv( "type", "text/css" ) . kv( "media", "screen,print")  );
      $css = "$selector { background: url( \"$thumbnail\" ) no-repeat;  background-size: 100% auto; background-origin: padding-box; }";
      e( $css );
      etag( "style" );
      
    } else {
      BW_::p( __( "No thumbnail", "oik-css" ) );
    }
  //}
  return( bw_ret() );
}