moonstonemedia / Simple-Calendar

includes/widgets/calendar.php

<?php
/**
 * Calendar Widget
 *
 * @package SimpleCalendar\Widgets
 */
namespace SimpleCalendar\Widgets;

use SimpleCalendar\Abstracts\Calendar_View;
use SimpleCalendar\Abstracts\Widget;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Calendar widget.
 *
 * Display calendars in a widget area.
 *
 * @since 3.0.0
 */
class Calendar extends \WP_Widget implements Widget {

	/**
	 * Calendar feeds.
	 *
	 * @access public
	 * @var array
	 */
	public $calendars = array();

	/**
	 * Calendar view.
	 *
	 * @access public
	 * @var Calendar_View
	 */
	public $view = null;

	/**
	 * Constructor.
	 *
	 * @since 3.0.0
	 */
	public function __construct() {

		$id_base        = 'gce_widget'; // old id kept for legacy reasons
		$name           = __( 'Simple Calendar', 'google-calendar-events' );
		$widget_options = array(
			'description' => __( 'Display a calendar of events from one of your calendar feeds.', 'google-calendar-events' )
		);

		parent::__construct( $id_base, $name, $widget_options );

		if ( is_admin() ) {
			if ( ! defined( 'DOING_AJAX' ) ) {
				$this->calendars = simcal_get_calendars();
			} else {
				$this->calendars = get_transient( '_simple-calendar_feed_ids' );
			}
		}
	}

	/**
	 * Print the widget content.
	 *
	 * @since 3.0.0
	 *
	 * @param array $args     Display arguments.
	 * @param array $instance The settings for the particular instance of the widget.
	 */
	public function widget( $args, $instance ) {

		echo $args['before_widget'];

		if ( ! empty( $instance['title'] ) ) {

			echo $args['before_title']  . apply_filters( 'widget_title', $instance['title'] ) . $args['after_title'];
		}

		$id = isset( $instance['calendar_id'] ) ? absint( $instance['calendar_id'] ) : 0;
		if ( $id > 0 ) {
			simcal_print_calendar( $id );
		}

		echo $args['after_widget'];
	}

	/**
	 * Update a particular instance of the widget.
	 *
	 * This function should check that $new_instance is set correctly.
	 * The newly-calculated value of `$instance` should be returned.
	 * If false is returned, the instance won't be saved/updated.
	 *
	 * @since  3.0.0
	 *
	 * @param  array $new_instance New settings for this instance as input by the user via
	 * @param  array $old_instance Old settings for this instance.
	 *
	 * @return array Settings to save or bool false to cancel saving.
	 */
	public function update( $new_instance, $old_instance ) {

		$instance = array();

		$instance['title']          = ( ! empty( $new_instance['title'] ) )        ? sanitize_text_field( $new_instance['title'] ) : '';
		$instance['calendar_id']    = ( ! empty( $new_instance['calendar_id'] ) )  ? absint( $new_instance['calendar_id'] ) : '';

		return $instance;
	}

	/**
	 * Print the settings update form.
	 *
	 * @since  3.0.0
	 *
	 * @param  array  $instance Current settings.
	 *
	 * @return string

Should the return type not be string|null?

	 */
	public function form( $instance ) {

		$title          = isset( $instance['title'] )       ? esc_attr( $instance['title'] ) : __( 'Calendar', 'google-calendar-events' );
		$calendar_id    = isset( $instance['calendar_id'] ) ? esc_attr( $instance['calendar_id'] ) : '';

		?>
		<div class="simcal-calendar-widget-settings">

			<p>
				<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:', 'google-calendar-events' ); ?></label>
				<br>
				<input type="text"
				       name="<?php echo $this->get_field_name( 'title' ); ?>"
				       id="<?php echo $this->get_field_id( 'title' ); ?>"
				       class="widefat simcal-field simcal-field-standard simcal-field-text"
				       value="<?php echo $title; ?>">
			</p>

			<p>
				<label for="<?php echo $this->get_field_id( 'calendar_id' ); ?>"><?php _e( 'Calendar:', 'google-calendar-events' ); ?></label>
				<br>
				<?php $multiselect = count( $this->calendars ) > 15 ? ' simcal-field-select-enhanced' : ''; ?>
				<select name="<?php echo $this->get_field_name( 'calendar_id' ) ?>"
				        id="<?php echo $this->get_field_id( 'calendar_id' ) ?>"
						class="simcal-field simcal-field-select<?php echo $multiselect; ?>"
						data-noresults="<?php __( 'No calendars found.', 'google-calendar-events' ); ?>">
						<?php foreach ( $this->calendars as $id => $name ) : ?>
							<option value="<?php echo $id; ?>" <?php selected( $id, $calendar_id, true ); ?>><?php echo $name; ?></option>
						<?php endforeach; ?>
				</select>
			</p>

		</div>
		<?php

	}

}