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<?php
/**
* Dark Mode Class
*
* @package WordPress
* @subpackage Twenty_Twenty_One
* @since Twenty Twenty-One 1.0
*/
/**
* This class is in charge of Dark Mode.
*/
class Twenty_Twenty_One_Dark_Mode {
/**
* Instantiate the object.
*
* @since Twenty Twenty-One 1.0
*/
public function __construct() {
// Enqueue assets for the block-editor.
add_action( 'enqueue_block_editor_assets', array( $this, 'editor_custom_color_variables' ) );
// Add styles for dark-mode.
add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
// Add scripts for customizer controls.
add_action( 'customize_controls_enqueue_scripts', array( $this, 'customize_controls_enqueue_scripts' ) );
// Add customizer controls.
add_action( 'customize_register', array( $this, 'customizer_controls' ) );
// Add HTML classes.
add_filter( 'twentytwentyone_html_classes', array( $this, 'html_classes' ) );
// Add classes to <body> in the dashboard.
add_filter( 'admin_body_class', array( $this, 'admin_body_classes' ) );
// Add the switch on the frontend & customizer.
add_action( 'wp_footer', array( $this, 'the_switch' ) );
// Add the privacy policy content.
add_action( 'admin_init', array( $this, 'add_privacy_policy_content' ) );
}
/**
* Editor custom color variables & scripts.
*
* @since Twenty Twenty-One 1.0
*
* @return void
*/
public function editor_custom_color_variables() {
if ( ! $this->switch_should_render() ) {
return;
}
$background_color = get_theme_mod( 'background_color', 'D1E4DD' );
$should_respect_color_scheme = get_theme_mod( 'respect_user_color_preference', false );
if ( $should_respect_color_scheme && Twenty_Twenty_One_Custom_Colors::get_relative_luminance_from_hex( $background_color ) > 127 ) {
// Add Dark Mode variable overrides.
wp_add_inline_style(
'twenty-twenty-one-custom-color-overrides',
'.is-dark-theme.is-dark-theme .editor-styles-wrapper { --global--color-background: var(--global--color-dark-gray); --global--color-primary: var(--global--color-light-gray); --global--color-secondary: var(--global--color-light-gray); --button--color-text: var(--global--color-background); --button--color-text-hover: var(--global--color-secondary); --button--color-text-active: var(--global--color-secondary); --button--color-background: var(--global--color-secondary); --button--color-background-active: var(--global--color-background); --global--color-border: #9ea1a7; --table--stripes-border-color: rgba(240, 240, 240, 0.15); --table--stripes-background-color: rgba(240, 240, 240, 0.15); }'
);
}
wp_enqueue_script(
'twentytwentyone-dark-mode-support-toggle',
get_template_directory_uri() . '/assets/js/dark-mode-toggler.js',
array(),
'1.0.0',
true
);
wp_enqueue_script(
'twentytwentyone-editor-dark-mode-support',
get_template_directory_uri() . '/assets/js/editor-dark-mode-support.js',
array( 'twentytwentyone-dark-mode-support-toggle' ),
'1.0.0',
true
);
}
/**
* Enqueue scripts and styles.
*
* @since Twenty Twenty-One 1.0
*
* @return void
*/
public function enqueue_scripts() {
if ( ! $this->switch_should_render() ) {
return;
}
$url = get_template_directory_uri() . '/assets/css/style-dark-mode.css';
if ( is_rtl() ) {
$url = get_template_directory_uri() . '/assets/css/style-dark-mode-rtl.css';
}
wp_enqueue_style( 'tt1-dark-mode', $url, array( 'twenty-twenty-one-style' ), wp_get_theme()->get( 'Version' ) ); // @phpstan-ignore-line. Version is always a string.
}
/**
* Enqueue scripts for the customizer.
*
* @since Twenty Twenty-One 1.0
*
* @return void
*/
public function customize_controls_enqueue_scripts() {
if ( ! $this->switch_should_render() ) {
return;
}
wp_enqueue_script(
'twentytwentyone-customize-controls',
get_template_directory_uri() . '/assets/js/customize.js',
array( 'customize-base', 'customize-controls', 'underscore', 'jquery', 'twentytwentyone-customize-helpers' ),
'1.0.0',
true
);
}
/**
* Register customizer options.
*
* @since Twenty Twenty-One 1.0
*
* @param WP_Customize_Manager $wp_customize Theme Customizer object.
* @return void
*/
public function customizer_controls( $wp_customize ) {
$colors_section = $wp_customize->get_section( 'colors' );
if ( is_object( $colors_section ) ) {
$colors_section->title = __( 'Colors & Dark Mode', 'twentytwentyone' );
}
// Custom notice control.
include_once get_theme_file_path( 'classes/class-twenty-twenty-one-customize-notice-control.php' ); // phpcs:ignore WPThemeReview.CoreFunctionality.FileInclude.FileIncludeFound
$wp_customize->add_setting(
'respect_user_color_preference_notice',
array(
'capability' => 'edit_theme_options',
'default' => '',
'sanitize_callback' => '__return_empty_string',
)
);
$wp_customize->add_control(
new Twenty_Twenty_One_Customize_Notice_Control(
$wp_customize,
'respect_user_color_preference_notice',
array(
'section' => 'colors',
'priority' => 100,
'active_callback' => static function() {
return 127 >= Twenty_Twenty_One_Custom_Colors::get_relative_luminance_from_hex( get_theme_mod( 'background_color', 'D1E4DD' ) );
},
)
)
);
$wp_customize->add_setting(
'respect_user_color_preference',
array(
'capability' => 'edit_theme_options',
'default' => false,
'sanitize_callback' => static function( $value ) {
return (bool) $value;
},
)
);
$description = '<p>';
$description .= sprintf(
/* translators: %s: Twenty Twenty-One support article URL. */
__( 'Dark Mode is a device setting. If a visitor to your site requests it, your site will be shown with a dark background and light text. <a href="%s">Learn more about Dark Mode.</a>', 'twentytwentyone' ),
esc_url( __( 'https://wordpress.org/support/article/twenty-twenty-one/#dark-mode-support', 'twentytwentyone' ) )
);
$description .= '</p>';
$description .= '<p>' . __( 'Dark Mode can also be turned on and off with a button that you can find in the bottom corner of the page.', 'twentytwentyone' ) . '</p>';
$wp_customize->add_control(
'respect_user_color_preference',
array(
'type' => 'checkbox',
'section' => 'colors',
'label' => esc_html__( 'Dark Mode support', 'twentytwentyone' ),
'priority' => 110,
'description' => $description,
'active_callback' => static function( $value ) {
return 127 < Twenty_Twenty_One_Custom_Colors::get_relative_luminance_from_hex( get_theme_mod( 'background_color', 'D1E4DD' ) );
},
)
);
// Add partial for background_color.
$wp_customize->selective_refresh->add_partial(
'background_color',
array(
'selector' => '#dark-mode-toggler',
'container_inclusive' => true,
'render_callback' => function() {
$attrs = ( $this->switch_should_render() ) ? array() : array( 'style' => 'display:none;' );
$this->the_html( $attrs );
},
)
);
}
/**
* Calculate classes for the main <html> element.
*
* @since Twenty Twenty-One 1.0
*
* @param string $classes The classes for <html> element.
* @return string
*/
public function html_classes( $classes ) {
if ( ! $this->switch_should_render() ) {
return $classes;
}
$background_color = get_theme_mod( 'background_color', 'D1E4DD' );
$should_respect_color_scheme = get_theme_mod( 'respect_user_color_preference', false );
if ( $should_respect_color_scheme && 127 <= Twenty_Twenty_One_Custom_Colors::get_relative_luminance_from_hex( $background_color ) ) {
return ( $classes ) ? ' respect-color-scheme-preference' : 'respect-color-scheme-preference';
}
return $classes;
}
/**
* Adds a class to the <body> element in the editor to accommodate dark-mode.
*
* @since Twenty Twenty-One 1.0
*
* @param string $classes The admin body-classes.
* @return string
*/
public function admin_body_classes( $classes ) {
if ( ! $this->switch_should_render() ) {
return $classes;
}
global $current_screen;
if ( empty( $current_screen ) ) {
set_current_screen();
}
if ( $current_screen->is_block_editor() ) {
$should_respect_color_scheme = get_theme_mod( 'respect_user_color_preference', false );
$background_color = get_theme_mod( 'background_color', 'D1E4DD' );
if ( $should_respect_color_scheme && Twenty_Twenty_One_Custom_Colors::get_relative_luminance_from_hex( $background_color ) > 127 ) {
$classes .= ' twentytwentyone-supports-dark-theme';
}
}
return $classes;
}
/**
* Determine if we want to print the dark-mode switch or not.
*
* @since Twenty Twenty-One 1.0
*
* @return bool
*/
public function switch_should_render() {
global $is_IE;
return (
get_theme_mod( 'respect_user_color_preference', false ) &&
! $is_IE &&
127 <= Twenty_Twenty_One_Custom_Colors::get_relative_luminance_from_hex( get_theme_mod( 'background_color', 'D1E4DD' ) )
);
}
/**
* Add night/day switch.
*
* @since Twenty Twenty-One 1.0
*
* @return void
*/
public function the_switch() {
if ( ! $this->switch_should_render() ) {
return;
}
$this->the_html();
$this->the_script();
}
/**
* Print the dark-mode switch HTML.
*
* Inspired from https://codepen.io/aaroniker/pen/KGpXZo (MIT-licensed)
*
* @since Twenty Twenty-One 1.0
*
* @param array $attrs The attributes to add to our <button> element.
* @return void
*/
public function the_html( $attrs = array() ) {
$attrs = wp_parse_args(
$attrs,
array(
'id' => 'dark-mode-toggler',
'class' => 'fixed-bottom',
'aria-pressed' => 'false',
'onClick' => 'toggleDarkMode()',
)
);
echo '<button';
foreach ( $attrs as $key => $val ) {
echo ' ' . esc_attr( $key ) . '="' . esc_attr( $val ) . '"';
}
echo '>';
printf(
/* translators: %s: On/Off */
esc_html__( 'Dark Mode: %s', 'twentytwentyone' ),
'<span aria-hidden="true"></span>'
);
echo '</button>';
?>
<style>
#dark-mode-toggler > span {
margin-<?php echo is_rtl() ? 'right' : 'left'; ?>: 5px;
}
#dark-mode-toggler > span::before {
content: '<?php esc_attr_e( 'Off', 'twentytwentyone' ); ?>';
}
#dark-mode-toggler[aria-pressed="true"] > span::before {
content: '<?php esc_attr_e( 'On', 'twentytwentyone' ); ?>';
}
<?php if ( is_admin() || wp_is_json_request() ) : ?>
.components-editor-notices__pinned ~ .edit-post-visual-editor #dark-mode-toggler {
z-index: 20;
}
.is-dark-theme.is-dark-theme #dark-mode-toggler:not(:hover):not(:focus) {
color: var(--global--color-primary);
}
@media only screen and (max-width: 782px) {
#dark-mode-toggler {
margin-top: 32px;
}
}
<?php endif; ?>
</style>
<?php
}
/**
* Print the dark-mode switch script.
*
* @since Twenty Twenty-One 1.0
*
* @return void
*/
public function the_script() {
echo '<script>';
include get_template_directory() . '/assets/js/dark-mode-toggler.js'; // phpcs:ignore WPThemeReview.CoreFunctionality.FileInclude
echo '</script>';
}
/**
* Adds information to the privacy policy.
*
* @since Twenty Twenty-One 1.0
*
* @return void
*/
public function add_privacy_policy_content() {
if ( ! function_exists( 'wp_add_privacy_policy_content' ) ) {
return;
}
$content = '<p class="privacy-policy-tutorial">' . __( 'Twenty Twenty-One uses LocalStorage when Dark Mode support is enabled.', 'twentytwentyone' ) . '</p>'
. '<strong class="privacy-policy-tutorial">' . __( 'Suggested text:', 'twentytwentyone' ) . '</strong> '
. __( 'This website uses LocalStorage to save the setting when Dark Mode support is turned on or off.<br> LocalStorage is necessary for the setting to work and is only used when a user clicks on the Dark Mode button.<br> No data is saved in the database or transferred.', 'twentytwentyone' );
wp_add_privacy_policy_content( __( 'Twenty Twenty-One', 'twentytwentyone' ), wp_kses_post( wpautop( $content, false ) ) );
}
}