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wp_render_background_support › WordPress Function

Since6.4.0
已弃用n/a
wp_render_background_support ( $block_content, $block )
访问:
  • private
参数: (2)
  • (string) $block_content Rendered block content.
    Required: Yes
  • (array) $block Block object.
    Required: Yes
返回:
  • (string) Filtered block content.
定义在:
文档:
Change Log:
  • 6.5.0

Renders the background styles to the block wrapper.

This block support uses the render_block hook to ensure that it is also applied to non-server-rendered blocks.


源码

function wp_render_background_support( $block_content, $block ) {
	$block_type                   = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
	$block_attributes             = ( isset( $block['attrs'] ) && is_array( $block['attrs'] ) ) ? $block['attrs'] : array();
	$has_background_image_support = block_has_support( $block_type, array( 'background', 'backgroundImage' ), false );

	if (
		! $has_background_image_support ||
		wp_should_skip_block_supports_serialization( $block_type, 'background', 'backgroundImage' )
	) {
		return $block_content;
	}

	$background_image_source = isset( $block_attributes['style']['background']['backgroundImage']['source'] )
		? $block_attributes['style']['background']['backgroundImage']['source']
		: null;
	$background_image_url    = isset( $block_attributes['style']['background']['backgroundImage']['url'] )
		? $block_attributes['style']['background']['backgroundImage']['url']
		: null;

	if ( ! $background_image_source && ! $background_image_url ) {
		return $block_content;
	}

	$background_size     = isset( $block_attributes['style']['background']['backgroundSize'] )
		? $block_attributes['style']['background']['backgroundSize']
		: 'cover';
	$background_position = isset( $block_attributes['style']['background']['backgroundPosition'] )
		? $block_attributes['style']['background']['backgroundPosition']
		: null;
	$background_repeat   = isset( $block_attributes['style']['background']['backgroundRepeat'] )
		? $block_attributes['style']['background']['backgroundRepeat']
		: null;

	$background_block_styles = array();

	if (
		'file' === $background_image_source &&
		$background_image_url
	) {
		// Set file based background URL.
		$background_block_styles['backgroundImage']['url'] = $background_image_url;
		// Only output the background size and repeat when an image url is set.
		$background_block_styles['backgroundSize']     = $background_size;
		$background_block_styles['backgroundRepeat']   = $background_repeat;
		$background_block_styles['backgroundPosition'] = $background_position;

		// If the background size is set to `contain` and no position is set, set the position to `center`.
		if ( 'contain' === $background_size && ! isset( $background_position ) ) {
			$background_block_styles['backgroundPosition'] = 'center';
		}
	}

	$styles = wp_style_engine_get_styles( array( 'background' => $background_block_styles ) );

	if ( ! empty( $styles['css'] ) ) {
		// Inject background styles to the first element, presuming it's the wrapper, if it exists.
		$tags = new WP_HTML_Tag_Processor( $block_content );

		if ( $tags->next_tag() ) {
			$existing_style = $tags->get_attribute( 'style' );
			$updated_style  = '';

			if ( ! empty( $existing_style ) ) {
				$updated_style = $existing_style;
				if ( ! str_ends_with( $existing_style, ';' ) ) {
					$updated_style .= ';';
				}
			}

			$updated_style .= $styles['css'];
			$tags->set_attribute( 'style', $updated_style );
			$tags->add_class( 'has-background' );
		}

		return $tags->get_updated_html();
	}

	return $block_content;
}