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<?php |
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/** |
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* Elements styles block support. |
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* |
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* @package gutenberg |
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*/ |
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|
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/** |
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* Get the elements class names. |
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* |
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* @param array $block Block object. |
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* @return string The unique class name. |
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*/ |
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function gutenberg_get_elements_class_name( $block ) { |
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return 'wp-elements-' . md5( serialize( $block ) ); |
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} |
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|
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/** |
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* Update the block content with elements class names. |
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* |
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* @param string $block_content Rendered block content. |
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* @param array $block Block object. |
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* @return string Filtered block content. |
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*/ |
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function gutenberg_render_elements_support( $block_content, $block ) { |
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if ( ! $block_content ) { |
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return $block_content; |
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} |
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|
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$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] ); |
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$skip_link_color_serialization = gutenberg_should_skip_block_supports_serialization( $block_type, 'color', 'link' ); |
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|
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if ( $skip_link_color_serialization ) { |
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return $block_content; |
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} |
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|
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$link_color = null; |
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if ( ! empty( $block['attrs'] ) ) { |
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$link_color = _wp_array_get( $block['attrs'], array( 'style', 'elements', 'link', 'color', 'text' ), null ); |
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} |
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|
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/* |
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* For now we only care about link color. |
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* This code in the future when we have a public API |
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* should take advantage of WP_Theme_JSON_Gutenberg::compute_style_properties |
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* and work for any element and style. |
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*/ |
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if ( null === $link_color ) { |
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return $block_content; |
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} |
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|
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$class_name = gutenberg_get_elements_class_name( $block ); |
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|
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// Like the layout hook this assumes the hook only applies to blocks with a single wrapper. |
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// Retrieve the opening tag of the first HTML element. |
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$html_element_matches = array(); |
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preg_match( '/<[^>]+>/', $block_content, $html_element_matches, PREG_OFFSET_CAPTURE ); |
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$first_element = $html_element_matches[0][0]; |
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// If the first HTML element has a class attribute just add the new class |
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// as we do on layout and duotone. |
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if ( str_contains( $first_element, 'class="' ) ) { |
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$content = preg_replace( |
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'/' . preg_quote( 'class="', '/' ) . '/', |
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'class="' . $class_name . ' ', |
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$block_content, |
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1 |
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); |
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} else { |
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// If the first HTML element has no class attribute we should inject the attribute before the attribute at the end. |
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$first_element_offset = $html_element_matches[0][1]; |
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$content = substr_replace( $block_content, ' class="' . $class_name . '"', $first_element_offset + strlen( $first_element ) - 1, 0 ); |
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} |
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|
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return $content; |
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} |
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|
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/** |
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* Render the elements stylesheet. |
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* |
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* In the case of nested blocks we want the parent element styles to be rendered before their descendants. |
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* This solves the issue of an element (e.g.: link color) being styled in both the parent and a descendant: |
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* we want the descendant style to take priority, and this is done by loading it after, in DOM order. |
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* |
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* @param string|null $pre_render The pre-rendered content. Default null. |
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* @param array $block The block being rendered. |
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* |
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* @return null |
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*/ |
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function gutenberg_render_elements_support_styles( $pre_render, $block ) { |
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$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] ); |
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$element_block_styles = isset( $block['attrs']['style']['elements'] ) ? $block['attrs']['style']['elements'] : null; |
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|
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/* |
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* For now we only care about link color. |
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*/ |
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$skip_link_color_serialization = gutenberg_should_skip_block_supports_serialization( $block_type, 'color', 'link' ); |
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|
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if ( $skip_link_color_serialization ) { |
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return null; |
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} |
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$class_name = gutenberg_get_elements_class_name( $block ); |
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$link_block_styles = isset( $element_block_styles['link'] ) ? $element_block_styles['link'] : null; |
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|
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gutenberg_style_engine_get_styles( |
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$link_block_styles, |
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array( |
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'selector' => ".$class_name a", |
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'context' => 'block-supports', |
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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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// Remove WordPress core filters to avoid rendering duplicate elements stylesheet & attaching classes twice. |
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remove_filter( 'render_block', 'wp_render_elements_support', 10, 2 ); |
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remove_filter( 'pre_render_block', 'wp_render_elements_support_styles', 10, 2 ); |
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add_filter( 'render_block', 'gutenberg_render_elements_support', 10, 2 ); |
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add_filter( 'pre_render_block', 'gutenberg_render_elements_support_styles', 10, 2 ); |
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