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make_before_block_visitor › WordPress Function

Since6.4.0
Deprecatedn/a
› make_before_block_visitor ( $hooked_blocks, $context, $callback = 'insert_hooked_blocks' )
Access:
  • private
Parameters: (3)
  • (array) $hooked_blocks An array of blocks hooked to another given block.
    Required: Yes
  • (WP_Block_Template|WP_Post|array) $context A block template, template part, post object, or pattern that the blocks belong to.
    Required: Yes
  • (callable) $callback A function that will be called for each block to generate the markup for a given list of blocks that are hooked to it. Default: 'insert_hooked_blocks'.
    Required: No
    Default: 'insert_hooked_blocks'
Returns:
  • (callable) A function that returns the serialized markup for the given block, including the markup for any hooked blocks before it.
Defined at:
Codex:
Change Log:
  • 6.5.0

Returns a function that injects the theme attribute into, and hooked blocks before, a given block.

The returned function can be used as $pre_callback argument to traverse_and_serialize_block(s), where it will inject the theme attribute into all Template Part blocks, and prepend the markup for any blocks hooked before the given block and as its parent's first_child, respectively. This function is meant for internal use only.


Related Functions: make_after_block_visitor, wp_render_block_visibility_support, before_last_bar, parse_blocks, wp_use_widgets_block_editor

Source 

function make_before_block_visitor( $hooked_blocks, $context, $callback = 'insert_hooked_blocks' ) {
	/**
	 * Injects hooked blocks before the given block, injects the `theme` attribute into Template Part blocks, and returns the serialized markup.
	 *
	 * If the current block is a Template Part block, inject the `theme` attribute.
	 * Furthermore, prepend the markup for any blocks hooked `before` the given block and as its parent's
	 * `first_child`, respectively, to the serialized markup for the given block.
	 *
	 * @param array $block        The block to inject the theme attribute into, and hooked blocks before. Passed by reference.
	 * @param array $parent_block The parent block of the given block. Passed by reference. Default null.
	 * @param array $prev         The previous sibling block of the given block. Default null.
	 * @return string The serialized markup for the given block, with the markup for any hooked blocks prepended to it.
	 */
	return function ( &$block, &$parent_block = null, $prev = null ) use ( $hooked_blocks, $context, $callback ) {
		_inject_theme_attribute_in_template_part_block( $block );

		$markup = '';

		if ( $parent_block && ! $prev ) {
			// Candidate for first-child insertion.
			$markup .= call_user_func_array(
				$callback,
				array( &$parent_block, 'first_child', $hooked_blocks, $context )
			);
		}

		$markup .= call_user_func_array(
			$callback,
			array( &$block, 'before', $hooked_blocks, $context )
		);

		return $markup;
	};
}