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Edit File: custom-header.php

<?php
/**
 * Implement Custom Header functionality for Twenty Fourteen
 *
 * @package WordPress
 * @subpackage Twenty_Fourteen
 * @since Twenty Fourteen 1.0
 */

/**
 * Set up the WordPress core custom header settings.
 *
 * @since Twenty Fourteen 1.0
 *
 * @uses twentyfourteen_header_style()
 * @uses twentyfourteen_admin_header_style()
 * @uses twentyfourteen_admin_header_image()
 */
function twentyfourteen_custom_header_setup() {
	add_theme_support(
		'custom-header',
		/**
		 * Filters Twenty Fourteen custom-header support arguments.
		 *
		 * @since Twenty Fourteen 1.0
		 *
		 * @param array $args {
		 *     An array of custom-header support arguments.
		 *
		 *     @type bool   $header_text            Whether to display custom header text. Default false.
		 *     @type int    $width                  Width in pixels of the custom header image. Default 1260.
		 *     @type int    $height                 Height in pixels of the custom header image. Default 240.
		 *     @type bool   $flex_height            Whether to allow flexible-height header images. Default true.
		 *     @type string $admin_head_callback    Callback function used to style the image displayed in
		 *                                          the Appearance > Header screen.
		 *     @type string $admin_preview_callback Callback function used to create the custom header markup in
		 *                                          the Appearance > Header screen.
		 * }
		 */
		apply_filters(
			'twentyfourteen_custom_header_args',
			array(
				'default-text-color'     => 'fff',
				'width'                  => 1260,
				'height'                 => 240,
				'flex-height'            => true,
				'wp-head-callback'       => 'twentyfourteen_header_style',
				'admin-head-callback'    => 'twentyfourteen_admin_header_style',
				'admin-preview-callback' => 'twentyfourteen_admin_header_image',
			)
		)
	);
}
add_action( 'after_setup_theme', 'twentyfourteen_custom_header_setup' );

if ( ! function_exists( 'twentyfourteen_header_style' ) ) :
	/**
	 * Styles the header image and text displayed on the blog
	 *
	 * @see twentyfourteen_custom_header_setup().
	 */
	function twentyfourteen_header_style() {
		$text_color = get_header_textcolor();

// If no custom color for text is set, let's bail.
		if ( display_header_text() && get_theme_support( 'custom-header', 'default-text-color' ) === $text_color ) {
			return;
		}

// If we get this far, we have custom styles.
		?>
		<style type="text/css" id="twentyfourteen-header-css">
		<?php
		// Has the text been hidden?
		if ( ! display_header_text() ) :
			?>
		.site-title,
		.site-description {
			clip: rect(1px 1px 1px 1px); /* IE7 */
			clip: rect(1px, 1px, 1px, 1px);
			position: absolute;
		}
			<?php
			// If the user has set a custom color for the text, use that.
		elseif ( get_theme_support( 'custom-header', 'default-text-color' ) !== $text_color ) :
			?>
		.site-title a {
			color: #<?php echo esc_attr( $text_color ); ?>;
		}
	<?php endif; ?>
	</style>
		<?php
	}
endif; // twentyfourteen_header_style()

if ( ! function_exists( 'twentyfourteen_admin_header_style' ) ) :
	/**
	 * Style the header image displayed on the Appearance > Header screen.
	 *
	 * @see twentyfourteen_custom_header_setup()
	 *
	 * @since Twenty Fourteen 1.0
	 */
	function twentyfourteen_admin_header_style() {
		?>
	<style type="text/css" id="twentyfourteen-admin-header-css">
	.appearance_page_custom-header #headimg {
		background-color: #000;
		border: none;
		max-width: 1260px;
		min-height: 48px;
	}
	#headimg h1 {
		font-family: Lato, sans-serif;
		font-size: 18px;
		line-height: 48px;
		margin: 0 0 0 30px;
	}
	.rtl #headimg h1  {
		margin: 0 30px 0 0;
	}
	#headimg h1 a {
		color: #fff;
		text-decoration: none;
	}
	#headimg img {
		vertical-align: middle;
	}
	</style>
		<?php
	}
endif; // twentyfourteen_admin_header_style()

if ( ! function_exists( 'twentyfourteen_admin_header_image' ) ) :
	/**
	 * Create the custom header image markup displayed on the Appearance > Header screen.
	 *
	 * @see twentyfourteen_custom_header_setup()
	 *
	 * @since Twenty Fourteen 1.0
	 */
	function twentyfourteen_admin_header_image() {
		?>
	<div id="headimg">
		<?php if ( get_header_image() ) : ?>
		<img src="<?php header_image(); ?>" alt="" />
		<?php endif; ?>
		<h1 class="displaying-header-text"><a id="name" style="<?php echo esc_attr( sprintf( 'color: #%s;', get_header_textcolor() ) ); ?>" onclick="return false;" href="<?php echo esc_url( home_url( '/' ) ); ?>" tabindex="-1"><?php bloginfo( 'name' ); ?></a></h1>
	</div>
		<?php
	}
endif; // twentyfourteen_admin_header_image()

if ( ! function_exists( 'twentyfourteen_header_image' ) ) :
	/**
	 * Create the custom header image markup displayed.
	 *
	 * @see twentyfourteen_custom_header_setup()
	 *
	 * @since Twenty Fourteen 3.8
	 */
	function twentyfourteen_header_image() {
		$custom_header = get_custom_header();
		$attrs         = array(
			'alt'    => get_bloginfo( 'name', 'display' ),
			'height' => $custom_header->height,
			'width'  => $custom_header->width,
		);
		if ( function_exists( 'the_header_image_tag' ) ) {
			the_header_image_tag( $attrs );
			return;
		}
		?>
		<img src="<?php header_image(); ?>" width="<?php echo esc_attr( $attrs['width'] ); ?>" height="<?php echo esc_attr( $attrs['height'] ); ?>" alt="<?php echo esc_attr( $attrs['alt'] ); ?>" />
		<?php
	}
endif; // twentyfourteen_header_image()

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