<?php

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/**

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* Position block support flag.

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*

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* @package WordPress

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* @since 6.2.0

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*/

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/**

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* Registers the style block attribute for block types that support it.

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*

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* @since 6.2.0

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* @access private

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*

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* @param WP_Block_Type $block_type Block Type.

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*/

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function wp_register_position_support( $block_type ) {

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$has_position_support = block_has_support( $block_type, 'position', false );

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// Set up attributes and styles within that if needed.

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if ( ! $block_type->attributes ) {

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$block_type->attributes = array();

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}

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if ( $has_position_support && ! array_key_exists( 'style', $block_type->attributes ) ) {

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$block_type->attributes['style'] = array(

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'type' => 'object',

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);

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}

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}

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/**

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* Renders position styles to the block wrapper.

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*

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* @since 6.2.0

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* @access private

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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 wp_render_position_support( $block_content, $block ) {

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$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );

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$has_position_support = block_has_support( $block_type, 'position', false );

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if (

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! $has_position_support ||

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empty( $block['attrs']['style']['position'] )

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) {

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return $block_content;

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}

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$global_settings = wp_get_global_settings();

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$theme_has_sticky_support = isset( $global_settings['position']['sticky'] ) ? $global_settings['position']['sticky'] : false;

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$theme_has_fixed_support = isset( $global_settings['position']['fixed'] ) ? $global_settings['position']['fixed'] : false;

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// Only allow output for position types that the theme supports.

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$allowed_position_types = array();

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if ( true === $theme_has_sticky_support ) {

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$allowed_position_types[] = 'sticky';

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}

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if ( true === $theme_has_fixed_support ) {

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$allowed_position_types[] = 'fixed';

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}

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$style_attribute = isset( $block['attrs']['style'] ) ? $block['attrs']['style'] : null;

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$class_name = wp_unique_id( 'wp-container-' );

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$selector = ".$class_name";

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$position_styles = array();

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$position_type = isset( $style_attribute['position']['type'] ) ? $style_attribute['position']['type'] : '';

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$wrapper_classes = array();

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if (

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in_array( $position_type, $allowed_position_types, true )

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) {

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$wrapper_classes[] = $class_name;

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$wrapper_classes[] = 'is-position-' . $position_type;

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$sides = array( 'top', 'right', 'bottom', 'left' );

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foreach ( $sides as $side ) {

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$side_value = isset( $style_attribute['position'][ $side ] ) ? $style_attribute['position'][ $side ] : null;

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if ( null !== $side_value ) {

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/*

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* For fixed or sticky top positions,

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* ensure the value includes an offset for the logged in admin bar.

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*/

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if (

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'top' === $side &&

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( 'fixed' === $position_type || 'sticky' === $position_type )

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) {

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// Ensure 0 values can be used in `calc()` calculations.

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if ( '0' === $side_value || 0 === $side_value ) {

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$side_value = '0px';

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}

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// Ensure current side value also factors in the height of the logged in admin bar.

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$side_value = "calc($side_value + var(--wp-admin--admin-bar--position-offset, 0px))";

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}

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$position_styles[] =

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array(

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'selector' => $selector,

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'declarations' => array(

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$side => $side_value,

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),

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);

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}

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}

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$position_styles[] =

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array(

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'selector' => $selector,

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'declarations' => array(

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'position' => $position_type,

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'z-index' => '10',

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),

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);

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}

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if ( ! empty( $position_styles ) ) {

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/*

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* Add to the style engine store to enqueue and render position styles.

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*/

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wp_style_engine_get_stylesheet_from_css_rules(

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$position_styles,

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array(

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'context' => 'block-supports',

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'prettify' => false,

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)

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);

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// Inject class name to block container markup.

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$content = new WP_HTML_Tag_Processor( $block_content );

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$content->next_tag();

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foreach ( $wrapper_classes as $class ) {

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$content->add_class( $class );

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}

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return (string) $content;

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}

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return $block_content;

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}

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// Register the block support.

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WP_Block_Supports::get_instance()->register(

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'position',

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array(

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'register_attribute' => 'wp_register_position_support',

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)

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);

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add_filter( 'render_block', 'wp_render_position_support', 10, 2 );

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