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register_block_style_handle ( $metadata, $field_name, $index = 0 )
register_block_style_handle: 该函数用于注册一个新的块样式句柄,以用于定制块的样式。它需要三个参数:$handle, $style_args, 和$asset_callback。$handle是块样式的名称,$style_args是一个样式选项数组,而$asset_callback是一个为块样式注册样式资产(CSS和JS)的函数。
为块元数据域找到一个样式句柄。它检测是否提供了文件的路径,并在自动生成的句柄名下注册样式。否则,它返回未处理的样式句柄。
function register_block_style_handle( $metadata, $field_name, $index = 0 ) { if ( empty( $metadata[ $field_name ] ) ) { return false; } static $wpinc_path_norm = ''; if ( ! $wpinc_path_norm ) { $wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) ); } $is_core_block = isset( $metadata['file'] ) && 0 === strpos( $metadata['file'], $wpinc_path_norm ); // Skip registering individual styles for each core block when a bundled version provided. if ( $is_core_block && ! wp_should_load_separate_core_block_assets() ) { return false; } $style_handle = $metadata[ $field_name ]; if ( is_array( $style_handle ) ) { if ( empty( $style_handle[ $index ] ) ) { return false; } $style_handle = $style_handle[ $index ]; } $style_path = remove_block_asset_path_prefix( $style_handle ); $is_style_handle = $style_handle === $style_path; // Allow only passing style handles for core blocks. if ( $is_core_block && ! $is_style_handle ) { return false; } // Return the style handle unless it's the first item for every core block that requires special treatment. if ( $is_style_handle && ! ( $is_core_block && 0 === $index ) ) { return $style_handle; } // Check whether styles should have a ".min" suffix or not. $suffix = SCRIPT_DEBUG ? '' : '.min'; if ( $is_core_block ) { $style_path = "style$suffix.css"; } $style_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $style_path ) ); $has_style_file = '' !== $style_path_norm; if ( $has_style_file ) { $style_uri = plugins_url( $style_path, $metadata['file'] ); // Cache $theme_path_norm to avoid calling get_theme_file_path() multiple times. static $theme_path_norm = ''; if ( ! $theme_path_norm ) { $theme_path_norm = wp_normalize_path( get_theme_file_path() ); } $is_theme_block = str_starts_with( $style_path_norm, $theme_path_norm ); if ( $is_theme_block ) { $style_uri = get_theme_file_uri( str_replace( $theme_path_norm, '', $style_path_norm ) ); } elseif ( $is_core_block ) { $style_uri = includes_url( 'blocks/' . str_replace( 'core/', '', $metadata['name'] ) . "/style$suffix.css" ); } } else { $style_uri = false; } $style_handle = generate_block_asset_handle( $metadata['name'], $field_name, $index ); $version = ! $is_core_block && isset( $metadata['version'] ) ? $metadata['version'] : false; $result = wp_register_style( $style_handle, $style_uri, array(), $version ); if ( ! $result ) { return false; } if ( $has_style_file ) { wp_style_add_data( $style_handle, 'path', $style_path_norm ); $rtl_file = str_replace( "{$suffix}.css", "-rtl{$suffix}.css", $style_path_norm ); if ( is_rtl() && file_exists( $rtl_file ) ) { wp_style_add_data( $style_handle, 'rtl', 'replace' ); wp_style_add_data( $style_handle, 'suffix', $suffix ); wp_style_add_data( $style_handle, 'path', $rtl_file ); } } return $style_handle; }