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<?php |
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declare( strict_types=1 ); |
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|
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namespace GutSlider\Assets; |
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|
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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/** |
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* Handles loading of Google Fonts used in slider blocks. |
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* |
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* Collects font family attributes from rendered blocks and enqueues |
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* the corresponding Google Fonts stylesheets. |
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* |
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* @package GutSlider\Assets |
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* @since 3.0.0 |
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*/ |
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final class LoadFonts { |
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|
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/** |
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* System fonts that do not need to be loaded from Google Fonts. |
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* |
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* @since 3.0.0 |
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* @var array<int, string> |
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*/ |
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private const SYSTEM_FONTS = array( |
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// Posts saved before the picker stored an empty value for "inherit". |
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'Default', |
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'Arial', |
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'Tahoma', |
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'Verdana', |
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'Helvetica', |
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'Times New Roman', |
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'Trebuchet MS', |
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'Georgia', |
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); |
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|
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/** |
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* Collected font families from rendered blocks. |
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* |
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* @since 3.0.0 |
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* @var array<int, string> |
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*/ |
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private static array $all_fonts = array(); |
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|
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/** |
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* Constructor. |
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* |
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* Registers WordPress hooks for font loading. |
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* |
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* @since 3.0.0 |
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*/ |
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public function __construct() { |
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add_action( 'wp_enqueue_scripts', array( $this, 'fonts_loader' ), 10 ); |
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add_action( 'admin_enqueue_scripts', array( $this, 'fonts_loader' ), 10 ); |
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add_action( 'enqueue_block_assets', array( $this, 'enqueue_editor_fonts' ) ); |
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add_action( 'gutsliders_render_block', array( $this, 'font_generator' ) ); |
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} |
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|
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/** |
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* Enqueue the fonts used by the post open in the block editor. |
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* |
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* Hooked to `enqueue_block_assets` because WordPress mirrors that hook into |
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* the editor canvas iframe, which is where apiVersion 3 blocks render. |
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* `admin_enqueue_scripts` only reaches the document around the canvas, so |
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* the preview would resolve `font-family` against a font that document has |
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* but the iframe never loaded. |
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* |
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* @since 3.0.0 |
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* |
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* @return void |
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*/ |
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public function enqueue_editor_fonts(): void { |
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if ( ! is_admin() || ! function_exists( 'get_current_screen' ) ) { |
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return; |
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} |
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|
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$screen = get_current_screen(); |
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|
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if ( null === $screen || ! $screen->is_block_editor() ) { |
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return; |
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} |
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|
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$post = get_post(); |
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|
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if ( ! $post instanceof \WP_Post || ! has_blocks( $post->post_content ) ) { |
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return; |
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} |
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|
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$this->collect_fonts( parse_blocks( $post->post_content ) ); |
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$this->fonts_loader(); |
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} |
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|
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/** |
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* Walk a parsed block tree and record every font family it uses. |
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* |
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* The front end collects fonts from `render_block`, which fires for nested |
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* blocks too. A parsed tree has to be walked explicitly. |
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* |
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* @since 3.0.0 |
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* |
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* @param array<int, array<string, mixed>> $blocks Parsed blocks. |
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* @return void |
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*/ |
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private function collect_fonts( array $blocks ): void { |
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foreach ( $blocks as $block ) { |
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if ( isset( $block['attrs'] ) && is_array( $block['attrs'] ) ) { |
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$this->collect_block_fonts( $block['attrs'] ); |
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} |
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|
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if ( ! empty( $block['innerBlocks'] ) && is_array( $block['innerBlocks'] ) ) { |
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$this->collect_fonts( $block['innerBlocks'] ); |
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} |
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} |
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} |
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|
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/** |
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* Record the font families named in a single block's attributes. |
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* |
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* @since 3.0.0 |
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* |
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* @param array<string, mixed> $attributes Block attributes. |
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* @return void |
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*/ |
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private function collect_block_fonts( array $attributes ): void { |
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foreach ( $attributes as $key => $value ) { |
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if ( ! empty( $value ) |
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&& is_string( $value ) |
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&& strpos( $key, 'gutsliders_' ) === 0 |
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&& strpos( $key, 'FontFamily' ) !== false |
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) { |
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self::$all_fonts[] = sanitize_text_field( $value ); |
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} |
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} |
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} |
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|
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/** |
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* Extract font families from a rendered block's attributes. |
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* |
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* Scans block attributes for font family values and triggers |
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* the font loader to enqueue any new fonts found. |
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* |
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* @since 3.0.0 |
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* |
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* @param array<string, mixed> $block The block data array. |
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* @return void |
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*/ |
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public function font_generator( array $block ): void { |
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if ( isset( $block['attrs'] ) && is_array( $block['attrs'] ) ) { |
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$this->collect_block_fonts( $block['attrs'] ); |
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$this->fonts_loader(); |
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} |
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} |
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|
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/** |
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* Enqueue Google Fonts stylesheets for collected font families. |
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* |
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* Filters out system fonts and duplicates, then registers and |
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* enqueues individual Google Fonts CSS files. |
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* |
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* @since 3.0.0 |
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* |
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* @return void |
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*/ |
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public function fonts_loader(): void { |
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if ( ! $this->is_google_fonts_enabled() ) { |
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return; |
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} |
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|
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if ( ! is_array( self::$all_fonts ) || count( self::$all_fonts ) === 0 ) { |
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return; |
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} |
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|
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$fonts = array_filter( array_unique( self::$all_fonts ) ); |
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|
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if ( empty( $fonts ) ) { |
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return; |
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} |
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|
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$gfonts_attr = ':100,200,300,400,500,600,700,800,900'; |
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|
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foreach ( $fonts as $font ) { |
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if ( in_array( $font, self::SYSTEM_FONTS, true ) || empty( $font ) ) { |
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continue; |
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} |
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|
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$font_family = str_replace( ' ', '+', trim( $font ) ) . $gfonts_attr; |
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$query_args = array( 'family' => $font_family ); |
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$font_handle = 'gutsliders-font-' . sanitize_title( $font ); |
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|
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wp_register_style( |
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$font_handle, |
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add_query_arg( $query_args, '//fonts.googleapis.com/css' ), |
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array(), |
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GUTSLIDER_VERSION, |
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'all' |
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); |
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|
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wp_enqueue_style( $font_handle ); |
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} |
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} |
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|
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/** |
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* Whether Google Fonts requests are allowed. |
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* |
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* Site owners can turn this off from the GutSlider settings screen |
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* when the theme already loads the fonts or hosts them locally. |
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* |
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* @since 3.0.0 |
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* |
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* @return bool True when Google Fonts may be enqueued. |
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*/ |
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private function is_google_fonts_enabled(): bool { |
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$settings = get_option( 'gutslider_settings', array() ); |
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|
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if ( is_array( $settings ) && array_key_exists( 'google_fonts', $settings ) ) { |
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return (bool) $settings['google_fonts']; |
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} |
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|
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return true; |
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} |
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} |
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|
