wp_get_layout_style

wp_get_layout_style: 這個函式返回網站的當前佈局風格。它不接受任何引數，並返回一個包含佈局風格的字串。

生成與所提供的佈局相對應的CSS。

function wp_get_layout_style( $selector, $layout, $has_block_gap_support = false, $gap_value = null, $should_skip_gap_serialization = false, $fallback_gap_value = '0.5em', $block_spacing = null ) {
	$layout_type   = isset( $layout['type'] ) ? $layout['type'] : 'default';
	$layout_styles = array();

	if ( 'default' === $layout_type ) {
		if ( $has_block_gap_support ) {
			if ( is_array( $gap_value ) ) {
				$gap_value = isset( $gap_value['top'] ) ? $gap_value['top'] : null;
			}
			if ( null !== $gap_value && ! $should_skip_gap_serialization ) {
				// Get spacing CSS variable from preset value if provided.
				if ( is_string( $gap_value ) && str_contains( $gap_value, 'var:preset|spacing|' ) ) {
					$index_to_splice = strrpos( $gap_value, '|' ) + 1;
					$slug            = _wp_to_kebab_case( substr( $gap_value, $index_to_splice ) );
					$gap_value       = "var(--wp--preset--spacing--$slug)";
				}

				array_push(
					$layout_styles,
					array(
						'selector'     => "$selector > *",
						'declarations' => array(
							'margin-block-start' => '0',
							'margin-block-end'   => '0',
						),
					),
					array(
						'selector'     => "$selector$selector > * + *",
						'declarations' => array(
							'margin-block-start' => $gap_value,
							'margin-block-end'   => '0',
						),
					)
				);
			}
		}
	} elseif ( 'constrained' === $layout_type ) {
		$content_size    = isset( $layout['contentSize'] ) ? $layout['contentSize'] : '';
		$wide_size       = isset( $layout['wideSize'] ) ? $layout['wideSize'] : '';
		$justify_content = isset( $layout['justifyContent'] ) ? $layout['justifyContent'] : 'center';

		$all_max_width_value  = $content_size ? $content_size : $wide_size;
		$wide_max_width_value = $wide_size ? $wide_size : $content_size;

		// Make sure there is a single CSS rule, and all tags are stripped for security.
		$all_max_width_value  = safecss_filter_attr( explode( ';', $all_max_width_value )[0] );
		$wide_max_width_value = safecss_filter_attr( explode( ';', $wide_max_width_value )[0] );

		$margin_left  = 'left' === $justify_content ? '0 !important' : 'auto !important';
		$margin_right = 'right' === $justify_content ? '0 !important' : 'auto !important';

		if ( $content_size || $wide_size ) {
			array_push(
				$layout_styles,
				array(
					'selector'     => "$selector > :where(:not(.alignleft):not(.alignright):not(.alignfull))",
					'declarations' => array(
						'max-width'    => $all_max_width_value,
						'margin-left'  => $margin_left,
						'margin-right' => $margin_right,
					),
				),
				array(
					'selector'     => "$selector > .alignwide",
					'declarations' => array( 'max-width' => $wide_max_width_value ),
				),
				array(
					'selector'     => "$selector .alignfull",
					'declarations' => array( 'max-width' => 'none' ),
				)
			);

			if ( isset( $block_spacing ) ) {
				$block_spacing_values = wp_style_engine_get_styles(
					array(
						'spacing' => $block_spacing,
					)
				);

				/*
				 * Handle negative margins for alignfull children of blocks with custom padding set.
				 * They're added separately because padding might only be set on one side.
				 */
				if ( isset( $block_spacing_values['declarations']['padding-right'] ) ) {
					$padding_right   = $block_spacing_values['declarations']['padding-right'];
					$layout_styles[] = array(
						'selector'     => "$selector > .alignfull",
						'declarations' => array( 'margin-right' => "calc($padding_right * -1)" ),
					);
				}
				if ( isset( $block_spacing_values['declarations']['padding-left'] ) ) {
					$padding_left    = $block_spacing_values['declarations']['padding-left'];
					$layout_styles[] = array(
						'selector'     => "$selector > .alignfull",
						'declarations' => array( 'margin-left' => "calc($padding_left * -1)" ),
					);
				}
			}
		}

		if ( 'left' === $justify_content ) {
			$layout_styles[] = array(
				'selector'     => "$selector > :where(:not(.alignleft):not(.alignright):not(.alignfull))",
				'declarations' => array( 'margin-left' => '0 !important' ),
			);
		}

		if ( 'right' === $justify_content ) {
			$layout_styles[] = array(
				'selector'     => "$selector > :where(:not(.alignleft):not(.alignright):not(.alignfull))",
				'declarations' => array( 'margin-right' => '0 !important' ),
			);
		}

		if ( $has_block_gap_support ) {
			if ( is_array( $gap_value ) ) {
				$gap_value = isset( $gap_value['top'] ) ? $gap_value['top'] : null;
			}
			if ( null !== $gap_value && ! $should_skip_gap_serialization ) {
				// Get spacing CSS variable from preset value if provided.
				if ( is_string( $gap_value ) && str_contains( $gap_value, 'var:preset|spacing|' ) ) {
					$index_to_splice = strrpos( $gap_value, '|' ) + 1;
					$slug            = _wp_to_kebab_case( substr( $gap_value, $index_to_splice ) );
					$gap_value       = "var(--wp--preset--spacing--$slug)";
				}

				array_push(
					$layout_styles,
					array(
						'selector'     => "$selector > *",
						'declarations' => array(
							'margin-block-start' => '0',
							'margin-block-end'   => '0',
						),
					),
					array(
						'selector'     => "$selector$selector > * + *",
						'declarations' => array(
							'margin-block-start' => $gap_value,
							'margin-block-end'   => '0',
						),
					)
				);
			}
		}
	} elseif ( 'flex' === $layout_type ) {
		$layout_orientation = isset( $layout['orientation'] ) ? $layout['orientation'] : 'horizontal';

		$justify_content_options = array(
			'left'   => 'flex-start',
			'right'  => 'flex-end',
			'center' => 'center',
		);

		$vertical_alignment_options = array(
			'top'    => 'flex-start',
			'center' => 'center',
			'bottom' => 'flex-end',
		);

		if ( 'horizontal' === $layout_orientation ) {
			$justify_content_options += array( 'space-between' => 'space-between' );
		}

		if ( ! empty( $layout['flexWrap'] ) && 'nowrap' === $layout['flexWrap'] ) {
			$layout_styles[] = array(
				'selector'     => $selector,
				'declarations' => array( 'flex-wrap' => 'nowrap' ),
			);
		}

		if ( $has_block_gap_support && isset( $gap_value ) ) {
			$combined_gap_value = '';
			$gap_sides          = is_array( $gap_value ) ? array( 'top', 'left' ) : array( 'top' );

			foreach ( $gap_sides as $gap_side ) {
				$process_value = is_string( $gap_value ) ? $gap_value : _wp_array_get( $gap_value, array( $gap_side ), $fallback_gap_value );
				// Get spacing CSS variable from preset value if provided.
				if ( is_string( $process_value ) && str_contains( $process_value, 'var:preset|spacing|' ) ) {
					$index_to_splice = strrpos( $process_value, '|' ) + 1;
					$slug            = _wp_to_kebab_case( substr( $process_value, $index_to_splice ) );
					$process_value   = "var(--wp--preset--spacing--$slug)";
				}
				$combined_gap_value .= "$process_value ";
			}
			$gap_value = trim( $combined_gap_value );

			if ( null !== $gap_value && ! $should_skip_gap_serialization ) {
				$layout_styles[] = array(
					'selector'     => $selector,
					'declarations' => array( 'gap' => $gap_value ),
				);
			}
		}

		if ( 'horizontal' === $layout_orientation ) {
			/*
			 * Add this style only if is not empty for backwards compatibility,
			 * since we intend to convert blocks that had flex layout implemented
			 * by custom css.
			 */
			if ( ! empty( $layout['justifyContent'] ) && array_key_exists( $layout['justifyContent'], $justify_content_options ) ) {
				$layout_styles[] = array(
					'selector'     => $selector,
					'declarations' => array( 'justify-content' => $justify_content_options[ $layout['justifyContent'] ] ),
				);
			}

			if ( ! empty( $layout['verticalAlignment'] ) && array_key_exists( $layout['verticalAlignment'], $vertical_alignment_options ) ) {
				$layout_styles[] = array(
					'selector'     => $selector,
					'declarations' => array( 'align-items' => $vertical_alignment_options[ $layout['verticalAlignment'] ] ),
				);
			}
		} else {
			$layout_styles[] = array(
				'selector'     => $selector,
				'declarations' => array( 'flex-direction' => 'column' ),
			);
			if ( ! empty( $layout['justifyContent'] ) && array_key_exists( $layout['justifyContent'], $justify_content_options ) ) {
				$layout_styles[] = array(
					'selector'     => $selector,
					'declarations' => array( 'align-items' => $justify_content_options[ $layout['justifyContent'] ] ),
				);
			} else {
				$layout_styles[] = array(
					'selector'     => $selector,
					'declarations' => array( 'align-items' => 'flex-start' ),
				);
			}
		}
	}

	if ( ! empty( $layout_styles ) ) {
		/*
		 * Add to the style engine store to enqueue and render layout styles.
		 * Return compiled layout styles to retain backwards compatibility.
		 * Since https://github.com/WordPress/gutenberg/pull/42452,
		 * wp_enqueue_block_support_styles is no longer called in this block supports file.
		 */
		return wp_style_engine_get_stylesheet_from_css_rules(
			$layout_styles,
			array(
				'context'  => 'block-supports',
				'prettify' => false,
			)
		);
	}

	return '';
}