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wp-includes/customize/class-wp-customize-background-image-control.php

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+<?php
+/**
+ * Customize API: WP_Customize_Background_Image_Control class
+ *
+ * @package WordPress
+ * @subpackage Customize
+ * @since 4.4.0
+ */
+
+/**
+ * Customize Background Image Control class.
+ *
+ * @since 3.4.0
+ *
+ * @see WP_Customize_Image_Control
+ */
+class WP_Customize_Background_Image_Control extends WP_Customize_Image_Control {
+
+	/**
+	 * Customize control type.
+	 *
+	 * @since 4.1.0
+	 * @var string
+	 */
+	public $type = 'background';
+
+	/**
+	 * Constructor.
+	 *
+	 * @since 3.4.0
+	 * @uses WP_Customize_Image_Control::__construct()
+	 *
+	 * @param WP_Customize_Manager $manager Customizer bootstrap instance.
+	 */
+	public function __construct( $manager ) {
+		parent::__construct(
+			$manager,
+			'background_image',
+			array(
+				'label'   => __( 'Background Image' ),
+				'section' => 'background_image',
+			)
+		);
+	}
+
+	/**
+	 * Enqueue control related scripts/styles.
+	 *
+	 * @since 4.1.0
+	 */
+	public function enqueue() {
+		parent::enqueue();
+
+		$custom_background = get_theme_support( 'custom-background' );
+		wp_localize_script(
+			'customize-controls',
+			'_wpCustomizeBackground',
+			array(
+				'defaults' => ! empty( $custom_background[0] ) ? $custom_background[0] : array(),
+				'nonces'   => array(
+					'add' => wp_create_nonce( 'background-add' ),
+				),
+			)
+		);
+	}
+}