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<?php |
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namespace Falcon; |
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|
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use _WP_Dependency; |
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|
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class LazyLoadCSS { |
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public function __construct() { |
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add_action( 'wp_enqueue_scripts', [ $this, 'process' ], PHP_INT_MAX ); |
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add_action( 'wp_footer', [ $this, 'process' ], 15 ); // WordPress prints footer scripts at priority 20, so we must run before that. |
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} |
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|
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public function process() { |
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$files = $this->get_files(); |
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|
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foreach ( $files as $file ) { |
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$this->lazy_load( $file ); |
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} |
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|
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echo "\n"; |
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} |
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|
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private function lazy_load( string $file ): void { |
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$css = $this->get_css( $file ); |
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if ( ! $css || ! wp_style_is( $css->handle, 'enqueued' ) ) { |
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return; |
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} |
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|
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wp_dequeue_style( $css->handle ); |
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|
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$url = add_query_arg( 'ver', $css->ver, $css->src ); |
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// phpcs:ignore |
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echo "\n", '<link rel="stylesheet" href="', esc_url( $url ) . '" media="print" onload="this.media=\'all\'">'; |
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} |
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|
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private function get_css( string $file ): ?_WP_Dependency { |
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$wp_styles = wp_styles(); |
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|
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foreach ( $wp_styles->registered as $handle => $registered ) { |
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if ( $handle === $file || str_contains( $registered->src, $file ) ) { |
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return $registered; |
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} |
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} |
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|
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return null; |
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} |
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|
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private function get_files(): array { |
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$option = get_option( 'falcon', [] ); |
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$files = $option['lazy_load_css'] ?? ''; |
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$files = array_map( 'trim', explode( "\n", $files ) ); |
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|
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return $files; |
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} |
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} |
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|
