Custom_Background::take_action()

	public function take_action() {
		if ( empty($_POST) )
			return;

		if ( isset($_POST['reset-background']) ) {
			check_admin_referer('custom-background-reset', '_wpnonce-custom-background-reset');
			remove_theme_mod('background_image');
			remove_theme_mod('background_image_thumb');
			$this->updated = true;
			return;
		}

		if ( isset($_POST['remove-background']) ) {
			// @TODO: Uploaded files are not removed here.
			check_admin_referer('custom-background-remove', '_wpnonce-custom-background-remove');
			set_theme_mod('background_image', '');
			set_theme_mod('background_image_thumb', '');
			$this->updated = true;
			wp_safe_redirect( $_POST['_wp_http_referer'] );
			return;
		}

		if ( isset( $_POST['background-preset'] ) ) {
			check_admin_referer( 'custom-background' );

			if ( in_array( $_POST['background-preset'], array( 'default', 'fill', 'fit', 'repeat', 'custom' ), true ) ) {
				$preset = $_POST['background-preset'];
			} else {
				$preset = 'default';
			}

			set_theme_mod( 'background_preset', $preset );
		}

		if ( isset( $_POST['background-position'] ) ) {
			check_admin_referer( 'custom-background' );

			$position = explode( ' ', $_POST['background-position'] );

			if ( in_array( $position[0], array( 'left', 'center', 'right' ), true ) ) {
				$position_x = $position[0];
			} else {
				$position_x = 'left';
			}

			if ( in_array( $position[1], array( 'top', 'center', 'bottom' ), true ) ) {
				$position_y = $position[1];
			} else {
				$position_y = 'top';
			}

			set_theme_mod( 'background_position_x', $position_x );
			set_theme_mod( 'background_position_y', $position_y );
		}

		if ( isset( $_POST['background-size'] ) ) {
			check_admin_referer( 'custom-background' );

			if ( in_array( $_POST['background-size'], array( 'auto', 'contain', 'cover' ), true ) ) {
				$size = $_POST['background-size'];
			} else {
				$size = 'auto';
			}

			set_theme_mod( 'background_size', $size );
		}

		if ( isset( $_POST['background-repeat'] ) ) {
			check_admin_referer( 'custom-background' );

			$repeat = $_POST['background-repeat'];

			if ( 'no-repeat' !== $repeat ) {
				$repeat = 'repeat';
			}

			set_theme_mod( 'background_repeat', $repeat );
		}

		if ( isset( $_POST['background-attachment'] ) ) {
			check_admin_referer( 'custom-background' );

			$attachment = $_POST['background-attachment'];

			if ( 'fixed' !== $attachment ) {
				$attachment = 'scroll';
			}

			set_theme_mod( 'background_attachment', $attachment );
		}

		if ( isset($_POST['background-color']) ) {
			check_admin_referer('custom-background');
			$color = preg_replace('/[^0-9a-fA-F]/', '', $_POST['background-color']);
			if ( strlen($color) == 6 || strlen($color) == 3 )
				set_theme_mod('background_color', $color);
			else
				set_theme_mod('background_color', '');
		}

		$this->updated = true;
	}