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   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   */
  17  class 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          );
  37          parent::__construct( 'calendar', __( 'Calendar' ), $widget_ops );
  38      }
  39  
  40      /**
  41       * Outputs the content for the current Calendar widget instance.
  42       *
  43       * @since 2.8.0
  44       *
  45       * @param array $args     Display arguments including 'before_title', 'after_title',
  46       *                        'before_widget', and 'after_widget'.
  47       * @param array $instance The settings for the particular instance of the widget.
  48       */
  49  	public function widget( $args, $instance ) {
  50          $title = ! empty( $instance['title'] ) ? $instance['title'] : '';
  51  
  52          /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
  53          $title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
  54  
  55          echo $args['before_widget'];
  56          if ( $title ) {
  57              echo $args['before_title'] . $title . $args['after_title'];
  58          }
  59          if ( 0 === self::$instance ) {
  60              echo '<div id="calendar_wrap" class="calendar_wrap">';
  61          } else {
  62              echo '<div class="calendar_wrap">';
  63          }
  64          get_calendar();
  65          echo '</div>';
  66          echo $args['after_widget'];
  67  
  68          self::$instance++;
  69      }
  70  
  71      /**
  72       * Handles updating settings for the current Calendar widget instance.
  73       *
  74       * @since 2.8.0
  75       *
  76       * @param array $new_instance New settings for this instance as input by the user via
  77       *                            WP_Widget::form().
  78       * @param array $old_instance Old settings for this instance.
  79       * @return array Updated settings to save.
  80       */
  81  	public function update( $new_instance, $old_instance ) {
  82          $instance          = $old_instance;
  83          $instance['title'] = sanitize_text_field( $new_instance['title'] );
  84  
  85          return $instance;
  86      }
  87  
  88      /**
  89       * Outputs the settings form for the Calendar widget.
  90       *
  91       * @since 2.8.0
  92       *
  93       * @param array $instance Current settings.
  94       */
  95  	public function form( $instance ) {
  96          $instance = wp_parse_args( (array) $instance, array( 'title' => '' ) );
  97          ?>
  98          <p><label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>
  99          <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'] ); ?>" /></p>
 100          <?php
 101      }
 102  }