newsman_widget.php

<?php

// Creating the widget
class Newsman_subscribe_widget extends WP_Widget
{

	function __construct()
	{
		parent::__construct(
		// Base ID of your widget
			'Newsman_subscribe_widget',

			// Widget name will appear in UI
			__('Newsman Form', 'Newsman_subscribe_widget_domain'),

			// Widget description
			array('description' => __('Display newsman subscription form on site', 'Newsman_subscribe_widget_domain'),)
		);
	}

	// Creating widget front-end
	// This is where the action happens
	public function widget($args, $instance)
	{
		$title = apply_filters('widget_title', $instance['title']);
		// before and after widget arguments are defined by themes
		echo $args['before_widget'];
		if (!empty($title))
		{
			echo $args['before_title'] . $title . $args['after_title'];
		}

		// This is where you run the code and display the output
		$wp_newsman = new WP_Newsman();
		if ($wp_newsman->showOnFront())
		{
			$wp_newsman->newsmanDisplayForm();
		}
	}

	// Widget Backend
	public function form($instance)
	{
		if (isset($instance['title']))
		{
			$title = $instance['title'];
		} else
		{
			$title = __('New title', 'Newsman_subscribe_widget_domain');
		}
		// Widget admin form
		?>
		<p>
			<label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?></label>
			<input class="widefat" id="<?php echo $this->get_field_id('title'); ?>"
			       name="<?php echo $this->get_field_name('title'); ?>" type="text"
			       value="<?php echo esc_attr($title); ?>"/>
		</p>
		<?php
	}

// Updating widget replacing old instances with new
	public function update($new_instance, $old_instance)
	{
		$instance = array();
		$instance['title'] = (!empty($new_instance['title'])) ? strip_tags($new_instance['title']) : '';
		return $instance;
	}
} // Class Newsman_subscribe_widget ends here

// Register and load the widget
function wpb_load_widget()
{
	register_widget('Newsman_subscribe_widget');
}

add_action('widgets_init', 'wpb_load_widget');