source: hueman/3.1.3/functions/widgets/alx-posts.php

<?php
/*
        AlxPosts Widget

        License: GNU General Public License v3.0
        License URI: http://www.gnu.org/licenses/gpl-3.0.html

        Copyright: (c) 2013 Alexander "Alx" AgnarsCopyright: (c) 2013-2015 Alexander "Alx" Agnarson, 2015 Nicolas GUILLAUME (nikeo)

                @package AlxPosts
                @version 1.0
*/

class AlxPosts extends WP_Widget {

/*  Constructor
/* ------------------------------------ */
        function __construct() {
                parent::__construct(
      'alxposts',
      __('Hueman Posts', 'hueman'),
      array(
        'description' => __('Display posts from a category', 'hueman'),
        'classname' => 'widget_hu_posts'
      )
    );
        }

  public function hu_get_defaults() {
    return array(
      'title'       => '',
      // Posts
      'posts_thumb'     => 1,
      'posts_category'  => 1,
      'posts_date'    => 1,
      'posts_num'     => '4',
      'posts_cat_id'    => '0',
      'posts_orderby'   => 'date',
      'posts_time'    => '0',
    );
  }


  /*  Widget
  /* ------------------------------------ */
        public function widget($args, $instance) {
                extract( $args );

    $defaults = $this -> hu_get_defaults();

    $instance = wp_parse_args( (array) $instance, $defaults );

                $title = apply_filters('widget_title',$instance['title']);
                $output = $before_widget."\n";
                if($title)
                        $output .= $before_title.$title.$after_title;
                ob_start();

?>

        <?php
                $posts = new WP_Query( array(
                        'post_type'                             => array( 'post' ),
                        'showposts'                             => $instance['posts_num'],
                        'cat'                                   => $instance['posts_cat_id'],
                        'ignore_sticky_posts'   => true,
                        'orderby'                               => $instance['posts_orderby'],
                        'order'                                 => 'dsc',
                        'date_query' => array(
                                array(
                                        'after' => $instance['posts_time'],
                                ),
                        ),
                ) );
        ?>

        <ul class="alx-posts group <?php if($instance['posts_thumb']) { echo 'thumbs-enabled'; } ?>">
                <?php while ($posts->have_posts()): $posts->the_post(); ?>
                <li>

                        <?php if($instance['posts_thumb']) { // Thumbnails enabled? ?>
                        <div class="post-item-thumbnail">
                                <a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>">
                                        <?php if ( has_post_thumbnail() ): ?>
                                                <?php the_post_thumbnail('thumb-medium'); ?>
                                        <?php else: ?>
                                                <?php hu_print_placeholder_thumb(); ?>
                                        <?php endif; ?>
                                        <?php if ( has_post_format('video') && !is_sticky() ) echo'<span class="thumb-icon small"><i class="fa fa-play"></i></span>'; ?>
                                        <?php if ( has_post_format('audio') && !is_sticky() ) echo'<span class="thumb-icon small"><i class="fa fa-volume-up"></i></span>'; ?>
                                        <?php if ( is_sticky() ) echo'<span class="thumb-icon small"><i class="fa fa-star"></i></span>'; ?>
                                </a>
                        </div>
                        <?php } ?>

                        <div class="post-item-inner group">
                                <?php if($instance['posts_category']) { ?><p class="post-item-category"><?php the_category(' / '); ?></p><?php } ?>
                                <p class="post-item-title"><a href="<?php the_permalink(); ?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a></p>
                                <?php if($instance['posts_date']) { ?><p class="post-item-date"><?php the_time('j M, Y'); ?></p><?php } ?>
                        </div>

                </li>
                <?php endwhile; ?>
                <?php wp_reset_postdata(); ?>
        </ul><!--/.alx-posts-->

<?php
                $output .= ob_get_clean();
                $output .= $after_widget."\n";
                echo $output;
        }

/*  Widget update
/* ------------------------------------ */
        public function update($new,$old) {
                $instance = $old;
                $instance['title'] = strip_tags($new['title']);
        // Posts
                $instance['posts_thumb'] = $new['posts_thumb']?1:0;
                $instance['posts_category'] = $new['posts_category']?1:0;
                $instance['posts_date'] = $new['posts_date']?1:0;
                $instance['posts_num'] = strip_tags($new['posts_num']);
                $instance['posts_cat_id'] = strip_tags($new['posts_cat_id']);
                $instance['posts_orderby'] = strip_tags($new['posts_orderby']);
                $instance['posts_time'] = strip_tags($new['posts_time']);
                return $instance;
        }

/*  Widget form
/* ------------------------------------ */
        public function form($instance) {
                // Default widget settings
                $defaults = $this -> hu_get_defaults();
                $instance = wp_parse_args( (array) $instance, $defaults );
?>

        <style>
        .widget .widget-inside .alx-options-posts .postform { width: 100%; }
        .widget .widget-inside .alx-options-posts p { margin: 3px 0; }
        .widget .widget-inside .alx-options-posts hr { margin: 20px 0 10px; }
        .widget .widget-inside .alx-options-posts h4 { margin-bottom: 10px; }
        </style>

        <div class="alx-options-posts">
                <p>
                        <label for="<?php echo esc_attr( $this->get_field_id('title') ); ?>">Title:</label>
                        <input class="widefat" id="<?php echo esc_attr( $this->get_field_id('title') ); ?>" name="<?php echo esc_attr( $this->get_field_name('title') ); ?>" type="text" value="<?php echo esc_attr( $instance["title"] ); ?>" />
                </p>

                <h4>List Posts</h4>

                <p>
                        <input type="checkbox" class="checkbox" id="<?php echo esc_attr( $this->get_field_id('posts_thumb') ); ?>" name="<?php echo esc_attr( $this->get_field_name('posts_thumb') ); ?>" <?php checked( (bool) $instance["posts_thumb"], true ); ?>>
                        <label for="<?php echo esc_attr( $this->get_field_id('posts_thumb') ); ?>">Show thumbnails</label>
                </p>
                <p>
                        <label style="width: 55%; display: inline-block;" for="<?php echo esc_attr( $this->get_field_id("posts_num") ); ?>">Items to show</label>
                        <input style="width:20%;" id="<?php echo esc_attr( $this->get_field_id("posts_num") ); ?>" name="<?php echo esc_attr( $this->get_field_name("posts_num") ); ?>" type="text" value="<?php echo absint($instance["posts_num"]); ?>" size='3' />
                </p>
                <p>
                        <label style="width: 100%; display: inline-block;" for="<?php echo esc_attr( $this->get_field_id("posts_cat_id") ); ?>">Category:</label>
                        <?php wp_dropdown_categories( array( 'name' => $this->get_field_name("posts_cat_id"), 'selected' => $instance["posts_cat_id"], 'show_option_all' => 'All', 'show_count' => true ) ); ?>
                </p>
                <p style="padding-top: 0.3em;">
                        <label style="width: 100%; display: inline-block;" for="<?php echo esc_attr( $this->get_field_id("posts_orderby") ); ?>">Order by:</label>
                        <select style="width: 100%;" id="<?php echo esc_attr( $this->get_field_id("posts_orderby") ); ?>" name="<?php echo esc_attr( $this->get_field_name("posts_orderby") ); ?>">
                          <option value="date"<?php selected( $instance["posts_orderby"], "date" ); ?>>Most recent</option>
                          <option value="comment_count"<?php selected( $instance["posts_orderby"], "comment_count" ); ?>>Most commented</option>
                          <option value="rand"<?php selected( $instance["posts_orderby"], "rand" ); ?>>Random</option>
                        </select>
                </p>
                <p style="padding-top: 0.3em;">
                        <label style="width: 100%; display: inline-block;" for="<?php echo esc_attr( $this->get_field_id("posts_time") ); ?>">Posts from:</label>
                        <select style="width: 100%;" id="<?php echo esc_attr( $this->get_field_id("posts_time") ); ?>" name="<?php echo esc_attr( $this->get_field_name("posts_time") ); ?>">
                          <option value="0"<?php selected( $instance["posts_time"], "0" ); ?>>All time</option>
                          <option value="1 year ago"<?php selected( $instance["posts_time"], "1 year ago" ); ?>>This year</option>
                          <option value="1 month ago"<?php selected( $instance["posts_time"], "1 month ago" ); ?>>This month</option>
                          <option value="1 week ago"<?php selected( $instance["posts_time"], "1 week ago" ); ?>>This week</option>
                          <option value="1 day ago"<?php selected( $instance["posts_time"], "1 day ago" ); ?>>Past 24 hours</option>
                        </select>
                </p>

                <hr>
                <h4>Post Info</h4>

                <p>
                        <input type="checkbox" class="checkbox" id="<?php echo esc_attr( $this->get_field_id('posts_category') ); ?>" name="<?php echo esc_attr( $this->get_field_name('posts_category') ); ?>" <?php checked( (bool) $instance["posts_category"], true ); ?>>
                        <label for="<?php echo esc_attr( $this->get_field_id('posts_category') ); ?>">Show categories</label>
                </p>
                <p>
                        <input type="checkbox" class="checkbox" id="<?php echo esc_attr( $this->get_field_id('posts_date') ); ?>" name="<?php echo esc_attr( $this->get_field_name('posts_date') ); ?>" <?php checked( (bool) $instance["posts_date"], true ); ?>>
                        <label for="<?php echo esc_attr( $this->get_field_id('posts_date') ); ?>">Show dates</label>
                </p>

                <hr>

        </div>
<?php

}

}

/*  Register widget
/* ------------------------------------ */
if ( ! function_exists( 'hu_register_widget_posts' ) ) {

        function hu_register_widget_posts() {
                register_widget( 'AlxPosts' );
        }

}
add_action( 'widgets_init', 'hu_register_widget_posts' );