Editor: Adds 'settings.typography.fluid.minFontSize' support to wp_ge…

…t_typography_font_size_value().

In `wp_get_typography_font_size_value()`, adds support for using a minimum font size for fluid typography when defined in a theme's `theme.json` file.

Reference:
* Part of [WordPress/gutenberg#42489 Gutenberg PR 42489]

Follow-up to [54497], [54260].

Props andrewserong, ramonopoly, hellofromTonya, joen.
Fixes #57529.

git-svn-id: https://develop.svn.wordpress.org/trunk@55133 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/block-supports/typography.php

@@ -453,6 +453,7 @@ function wp_get_computed_fluid_typography_value( $args = array() ) {
  *
  * @since 6.1.0
  * @since 6.1.1 Adjusted rules for min and max font sizes.
+ * @since 6.2.0 Added 'settings.typography.fluid.minFontSize' support.
  *
  * @param array $preset                     {
  *     Required. fontSizes preset value as seen in theme.json.
@@ -479,19 +480,29 @@ function wp_get_typography_font_size_value( $preset, $should_use_fluid_typograph
 	}
 
 	// Checks if fluid font sizes are activated.
-	$typography_settings         = wp_get_global_settings( array( 'typography' ) );
-	$should_use_fluid_typography = isset( $typography_settings['fluid'] ) && true === $typography_settings['fluid'] ? true : $should_use_fluid_typography;
+	$typography_settings = wp_get_global_settings( array( 'typography' ) );
+	if (
+		isset( $typography_settings['fluid'] ) &&
+		( true === $typography_settings['fluid'] || is_array( $typography_settings['fluid'] ) )
+	) {
+		$should_use_fluid_typography = true;
+	}
 
 	if ( ! $should_use_fluid_typography ) {
 		return $preset['size'];
 	}
 
+	$fluid_settings = isset( $typography_settings['fluid'] ) && is_array( $typography_settings['fluid'] )
+		? $typography_settings['fluid']
+		: array();
+
 	// Defaults.
 	$default_maximum_viewport_width   = '1600px';
 	$default_minimum_viewport_width   = '768px';
 	$default_minimum_font_size_factor = 0.75;
 	$default_scale_factor             = 1;
-	$default_minimum_font_size_limit  = '14px';
+	$has_min_font_size                = isset( $fluid_settings['minFontSize'] ) && ! empty( wp_get_typography_value_and_unit( $fluid_settings['minFontSize'] ) );
+	$default_minimum_font_size_limit  = $has_min_font_size ? $fluid_settings['minFontSize'] : '14px';
 
 	// Font sizes.
 	$fluid_font_size_settings = isset( $preset['fluid'] ) ? $preset['fluid'] : null;

tests/phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/style.css

@@ -0,0 +1,8 @@
+/*
+Theme Name: Block Theme Child Theme With Fluid Typography Config
+Theme URI: https://wordpress.org/
+Description: For testing purposes only.
+Template: block-theme
+Version: 1.0.0
+Text Domain: block-theme-child-with-fluid-typography
+*/

tests/phpunit/data/themedir1/block-theme-child-with-fluid-typography-config/theme.json

@@ -0,0 +1,11 @@
+{
+	"version": 2,
+	"settings": {
+		"appearanceTools": true,
+		"typography": {
+			"fluid": {
+				"minFontSize": "16px"
+			}
+		}
+	}
+}

tests/phpunit/tests/block-supports/typography.php

@@ -567,21 +567,18 @@ public function data_generate_font_size_preset_fixtures() {
 	 *
 	 * @ticket 56467
 	 * @ticket 57065
+	 * @ticket 57529
 	 *
 	 * @covers ::wp_register_typography_support
 	 *
 	 * @dataProvider data_generate_block_supports_font_size_fixtures
 	 *
-	 * @param string $font_size_value             The block supports custom font size value.
-	 * @param bool   $should_use_fluid_typography An override to switch fluid typography "on". Can be used for unit testing.
-	 * @param string $expected_output             Expected value of style property from wp_apply_typography_support().
+	 * @param string $font_size_value The block supports custom font size value.
+	 * @param string $theme_slug      A theme slug corresponding to an available test theme.
+	 * @param string $expected_output Expected value of style property from wp_apply_typography_support().
 	 */
-	public function test_should_covert_font_sizes_to_fluid_values( $font_size_value, $should_use_fluid_typography, $expected_output ) {
-		if ( $should_use_fluid_typography ) {
-			switch_theme( 'block-theme-child-with-fluid-typography' );
-		} else {
-			switch_theme( 'default' );
-		}
+	public function test_should_covert_font_sizes_to_fluid_values( $font_size_value, $theme_slug, $expected_output ) {
+		switch_theme( $theme_slug );
 
 		$this->test_block_name = 'test/font-size-fluid-value';
 		register_block_type(
@@ -623,15 +620,30 @@ public function test_should_covert_font_sizes_to_fluid_values( $font_size_value,
 	 */
 	public function data_generate_block_supports_font_size_fixtures() {
 		return array(
-			'default_return_value'               => array(
-				'font_size_value'             => '50px',
-				'should_use_fluid_typography' => false,
-				'expected_output'             => 'font-size:50px;',
-			),
-			'return_value_with_fluid_typography' => array(
-				'font_size_value'             => '50px',
-				'should_use_fluid_typography' => true,
-				'expected_output'             => 'font-size:clamp(37.5px, 2.344rem + ((1vw - 7.68px) * 1.502), 50px);',
+			'returns value when fluid typography is not active' => array(
+				'font_size_value' => '15px',
+				'theme_slug'      => 'default',
+				'expected_output' => 'font-size:15px;',
+			),
+			'returns clamp value using default config' => array(
+				'font_size_value' => '15px',
+				'theme_slug'      => 'block-theme-child-with-fluid-typography',
+				'expected_output' => 'font-size:clamp(14px, 0.875rem + ((1vw - 7.68px) * 0.12), 15px);',
+			),
+			'returns value when font size <= default min font size bound' => array(
+				'font_size_value' => '13px',
+				'theme_slug'      => 'block-theme-child-with-fluid-typography',
+				'expected_output' => 'font-size:13px;',
+			),
+			'returns clamp value using custom fluid config' => array(
+				'font_size_value' => '17px',
+				'theme_slug'      => 'block-theme-child-with-fluid-typography-config',
+				'expected_output' => 'font-size:clamp(16px, 1rem + ((1vw - 7.68px) * 0.12), 17px);',
+			),
+			'returns value when font size <= custom min font size bound' => array(
+				'font_size_value' => '15px',
+				'theme_slug'      => 'block-theme-child-with-fluid-typography-config',
+				'expected_output' => 'font-size:15px;',
 			),
 		);
 	}

tests/phpunit/tests/theme/themeDir.php

@@ -180,6 +180,7 @@ public function test_theme_list() {
 			'Block Theme Child Theme',
 			'Block Theme Child with no theme.json',
 			'Block Theme Child Theme With Fluid Typography',
+			'Block Theme Child Theme With Fluid Typography Config',
 			'Block Theme [0.4.0]',
 			'Block Theme [1.0.0] in subdirectory',
 			'Block Theme Deprecated Path',