/**

* Constructor

*

* @return void

**/

function __construct() {

load_plugin_textdomain( 'be-static-subpages', false, dirname( plugin_basename( __FILE__ ) ) . '/languages/' );

$widget_ops = array( 'classname' => 'widget_static_subpages', 'description' => __( 'Select a page, and widget will list that page\'s subpages', 'be-static-subpages' ) );

parent::__construct( 'static-subpages-widget', __( 'Static Subpages Widget', 'be-static-subpages' ), $widget_ops );

}

/**

* Outputs the HTML for this widget.

*

* @param array, An array of standard parameters for widgets in this theme

* @param array, An array of settings for this widget instance

* @return void Echoes it's output

**/

function widget( $args, $instance ) {

extract( $args, EXTR_SKIP );

$page = (int) $instance['page'];

if( empty( $page ) )

return;

// Build a menu listing top level parent's children

$args = array(

'child_of' => $page,

'parent' => $page,

'sort_column' => 'menu_order',

'post_type' => 'page',

);

$depth = 1;

$subpages = get_pages( apply_filters( 'be_static_subpages_widget_args', $args, $depth ) );

// If there are pages, display the widget

if ( empty( $subpages ) )

return;

echo $before_widget;

// Build title

$title = esc_attr( $instance['title'] );

if( 1 == $instance['title_from_parent'] )

$title = get_the_title( $page );

$title = apply_filters( 'be_static_subpages_widget_title', $title );

if( 1 == $instance['title_link'] )

$title = '<a href="' . get_permalink( $page ) . '">' . $title . '</a>';

if( !empty( $title ) )

echo $before_title . $title . $after_title;

// Print the tree

$active = is_singular() && ! $instance['active'] ? get_the_ID() : $instance['active'];

$this->build_subpages( $subpages, $page, $active );

echo $after_widget;

}

/**

* Build the Subpages

*

* @param array $subpages, array of post objects

* @param array $parents, array of parent IDs

* @param bool $deep_subpages, whether to include current page's subpages

* @return string $output

*/

function build_subpages( $subpages, $page, $active ) {

if( empty( $subpages ) )

return;

// Build the page listing

echo '<ul>';

foreach ( $subpages as $subpage ) {

$class = array();

// Set special class for current page

if ( $subpage->ID == $active )

$class[] = 'widget_subpages_current_page';

$class = apply_filters( 'be_static_subpages_widget_class', $class, $subpage );

$class = !empty( $class ) ? ' class="' . implode( ' ', $class ) . '"' : '';

echo '<li' . $class . '><a href="' . get_permalink( $subpage->ID ) . '">' . apply_filters( 'be_subpages_page_title', $subpage->post_title, $subpage ) . '</a></li>';

}

echo '</ul>';

}

/**

* Sanitizes form inputs on save

*

* @param array $new_instance

* @param array $old_instance

* @return array $new_instance

*/

function update( $new_instance, $old_instance ) {

$instance = $old_instance;

/* Strip tags (if needed) and update the widget settings. */

$instance['page'] = (int) $new_instance['page'];

$instance['active'] = (int) $new_instance['active'];

$instance['title'] = esc_attr( $new_instance['title'] );

$instance['title_from_parent'] = (int) $new_instance['title_from_parent'];

$instance['title_link'] = (int) $new_instance['title_link'];

return $instance;

}

/**

* Build the widget's form

*

* @param array $instance, An array of settings for this widget instance

* @return null

*/

function form( $instance ) {

/* Set up some default widget settings. */

$defaults = array( 'page' => false, 'active' => false, 'title' => '', 'title_from_parent' => 0, 'title_link' => 0 );

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

$dropdown_args = array(

'post_type' => 'page',

'selected' => $instance['page'],

'name' => $this->get_field_name( 'page' ),

'sort_column' => 'menu_order, post_title',

'echo' => 0,

);

$dropdown_args = apply_filters( 'be_static_subpages_dropdown_args', $dropdown_args );

echo '<p><label for="' . $this->get_field_id( 'page' ) . '">Show Subpages of:</label><br />' . wp_dropdown_pages( $dropdown_args ) . '</p>';

$active_args = array(

'post_type' => 'page',

'selected' => $instance['active'],

'name' => $this->get_field_name( 'active' ),

'sort_column' => 'menu_order, post_title',

'echo' => 0,

'show_option_none' => '--None',

);

$active_args = apply_filters( 'be_static_subpages_active_args', $active_args );

echo '<p><label for="' . $this->get_field_id( 'active' ) . '">Show as Active Page:</label><br />' . wp_dropdown_pages( $active_args ) . '</p>';

?>

<p>

<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:', 'be-subpages' );?></label>

<input class="widefat" type="text" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $instance['title']; ?>" />

</p>

<p>

<input class="checkbox" type="checkbox" value="1" <?php checked( $instance['title_from_parent'], 1 ); ?> id="<?php echo $this->get_field_id( 'title_from_parent' ); ?>" name="<?php echo $this->get_field_name( 'title_from_parent' ); ?>" />

<label for="<?php echo $this->get_field_id( 'title_from_parent' ); ?>"><?php _e( 'Use top level page as section title.', 'be-subpages' );?></label>

</p>

<p>

<input class="checkbox" type="checkbox" value="1" <?php checked( $instance['title_link'], 1 ); ?> id="<?php echo $this->get_field_id( 'title_link' ); ?>" name="<?php echo $this->get_field_name( 'title_link' ); ?>" />

<label for="<?php echo $this->get_field_id( 'title_link' ); ?>"><?php _e( 'Link widget title to top level page', 'be-subpages' ); echo '</label>';?>

</p>

<?php

}