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| NativeLazyImageTransform | |
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| 1 | <?php |
| 2 | |
| 3 | namespace MobileFrontend\Transforms; |
| 4 | |
| 5 | use Wikimedia\Parsoid\DOM\Document; |
| 6 | use Wikimedia\Parsoid\DOM\Element; |
| 7 | use Wikimedia\Parsoid\Utils\DOMCompat; |
| 8 | |
| 9 | /** |
| 10 | * Transforms Parsoid content so that it works with lazy loaded images. |
| 11 | */ |
| 12 | class NativeLazyImageTransform implements IMobileTransform { |
| 13 | |
| 14 | /** |
| 15 | * @param Element $node to be transformed |
| 16 | */ |
| 17 | public function apply( Element $node ) { |
| 18 | // Parsoid can have nested sections, so we use a child combinator |
| 19 | // here to avoid multiple applications of the lazy image transform to the |
| 20 | // nested sections. |
| 21 | $sections = DOMCompat::querySelectorAll( $node, '.mw-parser-output > section' ); |
| 22 | foreach ( $sections as $sectionNumber => $section ) { |
| 23 | if ( $sectionNumber > 0 ) { |
| 24 | $this->doRewriteImagesForLazyLoading( $section, $section->ownerDocument ); |
| 25 | } |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | /** |
| 30 | * Enables images to be loaded asynchronously |
| 31 | * |
| 32 | * @param Element|Document $el Element or document to rewrite images in. |
| 33 | * @param ?Document $doc Document to create elements in |
| 34 | */ |
| 35 | private function doRewriteImagesForLazyLoading( $el, ?Document $doc ) { |
| 36 | if ( $doc === null ) { |
| 37 | return; |
| 38 | } |
| 39 | |
| 40 | foreach ( DOMCompat::querySelectorAll( $el, 'img' ) as $img ) { |
| 41 | $img->setAttribute( 'loading', 'lazy' ); |
| 42 | } |
| 43 | } |
| 44 | } |