1<?php
  2/**
  3 * Widget API: WP_Widget_Calendar class
  4 *
  5 * @package WordPress
  6 * @subpackage Widgets
  7 * @since 4.4.0
  8 */
  9
 10/**
 11 * Core class used to implement the Calendar widget.
 12 *
 13 * @since 2.8.0
 14 *
 15 * @see WP_Widget
 16 */
 17class WP_Widget_Calendar extends WP_Widget {
 18	/**
 19	 * Ensure that the ID attribute only appears in the markup once
 20	 *
 21	 * @since 4.4.0
 22	 * @var int
 23	 */
 24	private static $instance = 0;
 25
 26	/**
 27	 * Sets up a new Calendar widget instance.
 28	 *
 29	 * @since 2.8.0
 30	 */
 31	public function __construct() {
 32		$widget_ops = array(
 33			'classname'                   => 'widget_calendar',
 34			'description'                 => __( 'A calendar of your site’s posts.' ),
 35			'customize_selective_refresh' => true,
 36			'show_instance_in_rest'       => true,
 37		);
 38		parent::__construct( 'calendar', __( 'Calendar' ), $widget_ops );
 39	}
 40
 41	/**
 42	 * Outputs the content for the current Calendar widget instance.
 43	 *
 44	 * @since 2.8.0
 45	 *
 46	 * @param array $args     Display arguments including 'before_title', 'after_title',
 47	 *                        'before_widget', and 'after_widget'.
 48	 * @param array $instance The settings for the particular instance of the widget.
 49	 */
 50	public function widget( $args, $instance ) {
 51		$title = ! empty( $instance['title'] ) ? $instance['title'] : '';
 52
 53		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
 54		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
 55
 56		echo $args['before_widget'];
 57		if ( $title ) {
 58			echo $args['before_title'] . $title . $args['after_title'];
 59		}
 60		if ( 0 === self::$instance ) {
 61			echo '<div id="calendar_wrap" class="calendar_wrap">';
 62		} else {
 63			echo '<div class="calendar_wrap">';
 64		}
 65		get_calendar();
 66		echo '</div>';
 67		echo $args['after_widget'];
 68
 69		++self::$instance;
 70	}
 71
 72	/**
 73	 * Handles updating settings for the current Calendar widget instance.
 74	 *
 75	 * @since 2.8.0
 76	 *
 77	 * @param array $new_instance New settings for this instance as input by the user via
 78	 *                            WP_Widget::form().
 79	 * @param array $old_instance Old settings for this instance.
 80	 * @return array Updated settings to save.
 81	 */
 82	public function update( $new_instance, $old_instance ) {
 83		$instance          = $old_instance;
 84		$instance['title'] = sanitize_text_field( $new_instance['title'] );
 85
 86		return $instance;
 87	}
 88
 89	/**
 90	 * Outputs the settings form for the Calendar widget.
 91	 *
 92	 * @since 2.8.0
 93	 *
 94	 * @param array $instance Current settings.
 95	 */
 96	public function form( $instance ) {
 97		$instance = wp_parse_args( (array) $instance, array( 'title' => '' ) );
 98		?>
 99		<p>
100			<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>
101			<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $instance['title'] ); ?>" />
102		</p>
103		<?php
104	}
105}
106