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24 changes: 24 additions & 0 deletions lib/block-supports/index.php
Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,8 @@ function gutenberg_apply_block_supports( $block_content, $block ) {
return $block_content;
}

$block = gutenberg_apply_default_block_attribute_values( $block );

$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
// If no render_callback, assume styles have been previously handled.
if ( ! $block_type || ! $block_type->render_callback ) {
Expand Down Expand Up @@ -106,3 +108,25 @@ function gutenberg_apply_block_supports( $block_content, $block ) {
function gutenberg_normalize_css_rule( $css_rule_string ) {
return trim( implode( ': ', preg_split( '/\s*:\s*/', $css_rule_string, 2 ) ), ';' );
}

/**
* Applies default values to block attributes if no values are set.
*
* @param object $block The block to apply default values to.
* @return object The block with default values applied to its attributes.
*/
function gutenberg_apply_default_block_attribute_values( $block ) {
$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
// If no render_callback, assume default values have been previously handled.
if ( ! $block_type || ! $block_type->render_callback || ! $block_type->attributes ) {
return $block;
}

foreach ( $block_type->attributes as $attribute_name => $attribute_value ) {
if ( ! isset( $block['attrs'][ $attribute_name ] ) && isset( $attribute_value['default'] ) ) {
$block['attrs'][ $attribute_name ] = $attribute_value['default'];
}
}

return $block;
}
47 changes: 47 additions & 0 deletions phpunit/class-block-supported-styles-test.php
Original file line number Diff line number Diff line change
Expand Up @@ -606,6 +606,53 @@ function test_all_supported() {
$this->assert_content_and_styles_and_classes_match( $block, $expected_classes, $expected_styles );
}

/**
* Tests that default values are applied if none are saved.
*/
function test_default_values_applied() {
$block_type_settings = array(
'attributes' => array(
'textColor' => array( 'default' => 'red' ),
'backgroundColor' => array( 'default' => 'black' ),
'style' => array(
'default' => array(
'color' => array(
'link' => 'var:preset|color|red',
),
'typography' => array(
'fontSize' => '10',
'lineHeight' => '10',
),
),
),
),
'supports' => array(
'__experimentalColor' => array(
'gradients' => true,
'linkColor' => true,
),
'__experimentalFontSize' => true,
'__experimentalLineHeight' => true,
'align' => true,
),
'render_callback' => true,
);
$this->register_block_type( 'core/example', $block_type_settings );

$block = array(
'blockName' => 'core/example',
'attrs' => array(),
'innerBlock' => array(),
'innerContent' => array(),
'innerHTML' => array(),
);

$expected_classes = 'foo-bar-class wp-block-example has-text-color has-red-color has-link-color has-background has-black-background-color';
$expected_styles = 'test: style; --wp--style--color--link: var(--wp--preset--color--red); font-size: 10px; line-height: 10;';

$this->assert_content_and_styles_and_classes_match( $block, $expected_classes, $expected_styles );
}

/**
* Tests that only styles for the supported flag are added.
* Verify one support enabled does not imply multiple supports enabled.
Expand Down