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<?php |
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/** |
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* Image Optimize plugin for Craft CMS |
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* |
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* Automatically optimize images after they've been transformed |
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* |
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* @link https://nystudio107.com |
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* @copyright Copyright (c) nystudio107 |
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*/ |
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namespace nystudio107\imageoptimize\models; |
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use craft\helpers\Html; |
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use craft\helpers\Template; |
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use Twig\Markup; |
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/** |
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* @author nystudio107 |
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* @package ImageOptimize |
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* @since 5.0.0-beta.1 |
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*/ |
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class LinkPreloadTag extends BaseTag |
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{ |
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/** |
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* @var array array of tag attributes for the <link rel="preload"> tag |
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*/ |
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public array $linkAttrs = []; |
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/** |
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* @inheritDoc |
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*/ |
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public function init(): void |
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{ |
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parent::init(); |
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// Any web browser that supports link rel="preload" as="image" also supports webp, so prefer that |
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$srcset = $this->optimizedImage->optimizedImageUrls; |
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if (!empty($this->optimizedImage->optimizedWebPImageUrls)) { |
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$srcset = $this->optimizedImage->optimizedWebPImageUrls; |
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} |
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// Populate the $imageAttrs |
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$this->linkAttrs = [ |
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'rel' => 'preload', |
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'as' => 'image', |
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'href' => reset($srcset), |
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'imagesrcset' => $this->optimizedImage->getSrcsetFromArray($srcset), |
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'imagesizes' => '100vw', |
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]; |
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} |
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/** |
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* Merge the passed array of tag attributes into $linkAttrs |
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* |
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* @param array $value |
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* @return $this |
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*/ |
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public function linkAttrs(array $value): LinkPreloadTag |
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{ |
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$this->linkAttrs = array_merge($this->linkAttrs, $value); |
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return $this; |
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} |
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/** |
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* Generate a complete <link rel="preload"> tag for the $optimizedImage OptimizedImage model |
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* ref: https://web.dev/preload-responsive-images/#imagesrcset-and-imagesizes |
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* |
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* @return Markup |
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*/ |
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public function render(): Markup |
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{ |
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$attrs = $this->linkAttrs; |
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// Remove any empty attributes |
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$attrs = $this->filterEmptyAttributes($attrs); |
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// Render the tag |
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$tag = Html::tag('link', '', $attrs); |
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return Template::raw($tag); |
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} |
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} |
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nystudio107 /
craft-imageoptimize
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