WordPress/wp-content/themes/twentyseventeen/inc/custom-header.php

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<?php
/**
* Custom header implementation
*
* @link http://codex.wordpress.org/Custom_Headers
*
* @package WordPress
* @subpackage Twenty_Seventeen
* @since 1.0
*/
/**
* Set up the WordPress core custom header feature.
*
* @uses twentyseventeen_header_style()
*/
function twentyseventeen_custom_header_setup() {
/**
* Filter Twenty Seventeen custom-header support arguments.
*
* @since Twenty Seventeen 1.0
*
* @param array $args {
* An array of custom-header support arguments.
*
* @type string $default-image Default image of the header.
* @type string $default_text_color Default color of the header text.
* @type int $width Width in pixels of the custom header image. Default 954.
* @type int $height Height in pixels of the custom header image. Default 1300.
* @type string $wp-head-callback Callback function used to styles the header image and text
* displayed on the blog.
* @type string $flex-height Flex support for height of header.
* }
*/
add_theme_support( 'custom-header', apply_filters( 'twentyseventeen_custom_header_args', array(
'default-image' => get_parent_theme_file_uri( '/assets/images/header.jpg' ),
'width' => 2000,
'height' => 1200,
'flex-height' => true,
'video' => true,
'wp-head-callback' => 'twentyseventeen_header_style',
) ) );
register_default_headers( array(
'default-image' => array(
'url' => '%s/assets/images/header.jpg',
'thumbnail_url' => '%s/assets/images/header.jpg',
'description' => __( 'Default Header Image', 'twentyseventeen' ),
),
) );
}
add_action( 'after_setup_theme', 'twentyseventeen_custom_header_setup' );
if ( ! function_exists( 'twentyseventeen_header_style' ) ) :
/**
* Styles the header image and text displayed on the blog.
*
* @see twentyseventeen_custom_header_setup().
*/
function twentyseventeen_header_style() {
$header_text_color = get_header_textcolor();
// If no custom options for text are set, let's bail.
// get_header_textcolor() options: add_theme_support( 'custom-header' ) is default, hide text (returns 'blank') or any hex value.
if ( get_theme_support( 'custom-header', 'default-text-color' ) === $header_text_color ) {
return;
}
// If we get this far, we have custom styles. Let's do this.
?>
<style type="text/css">
<?php
// Has the text been hidden?
if ( 'blank' === $header_text_color ) :
?>
.site-title,
.site-description {
position: absolute;
clip: rect(1px, 1px, 1px, 1px);
}
<?php
// If the user has set a custom color for the text use that.
else :
?>
.site-title a,
body.has-header-image .site-title a,
.site-description,
body.has-header-image .site-description {
color: #<?php echo esc_attr( $header_text_color ); ?>;
}
<?php endif; ?>
</style>
<?php
}
endif; // End of twentyseventeen_header_style.