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<?php
if(!defined('WPINC')) {
exit;
}
/**
* Event List Widget
*/
class EL_Widget extends WP_Widget {
private $items;
/**
* Register widget with WordPress.
*/
public function __construct() {
parent::__construct(
'event_list_widget', // Base ID
'Event List', // Name
array('description' => __('With this widget a list of upcoming events can be displayed.','event-list')) // Args
);
// define all available items
$this->items = array(
'title' => array('std_value' => __('Upcoming events','event-list').':'),
'cat_filter' => array('std_value' => 'all'),
'num_events' => array('std_value' => '3'),
'title_length' => array('std_value' => '0'),
'show_starttime' => array('std_value' => 'true'),
'show_location' => array('std_value' => 'false'),
'location_length' => array('std_value' => '0'),
'show_excerpt' => array('std_value' => 'false'),
'show_content' => array('std_value' => 'false'),
'content_length' => array('std_value' => '0'),
'url_to_page' => array('std_value' => ''),
'sc_id_for_url' => array('std_value' => '1'),
'link_to_event' => array('std_value' => 'false'),
'link_to_page' => array('std_value' => 'false'),
'link_to_page_caption' => array('std_value' => __('show events page','event-list')),
);
add_action('admin_init', array(&$this, 'load_widget_items_helptexts'), 2);
}
public function load_widget_items_helptexts() {
require_once(EL_PATH.'includes/widget_helptexts.php');
foreach($widget_items_helptexts as $name => $values) {
$this->items[$name] += $values;
}
unset($widget_items_helptexts);
}
/**
* Front-end display of widget.
*
* @see WP_Widget::widget()
*
* @param array $args Widget arguments.
* @param array $instance Saved values from database.
*/
public function widget($args, $instance) {
$this->prepare_instance($instance);
// TODO: sanitize $instance items
$title = apply_filters('widget_title', $instance['title']);
echo $args['before_widget'];
if(!empty($title)) {
echo $args['before_title'].$title.$args['after_title'];
}
$this->upgrade_widget($instance, true);
$linked_page_is_set = !empty($instance['url_to_page']);
$linked_page_id_is_set = 0 < intval($instance['sc_id_for_url']);
$shortcode = '[event-list show_filterbar=false';
$shortcode .= ' cat_filter='.$instance['cat_filter'];
$shortcode .= ' num_events="'.$instance['num_events'].'"';
$shortcode .= ' title_length='.$instance['title_length'];
$shortcode .= ' show_starttime='.$instance['show_starttime'];
$shortcode .= ' show_location='.$instance['show_location'];
$shortcode .= ' location_length='.$instance['location_length'];
$shortcode .= ' show_excerpt='.$instance['show_excerpt'];
$shortcode .= ' show_content='.$instance['show_content'];
$shortcode .= ' content_length='.$instance['content_length'];
if($linked_page_is_set && $linked_page_id_is_set) {
$shortcode .= ' link_to_event='.$instance['link_to_event'];
$shortcode .= ' url_to_page="'.$instance['url_to_page'].'"';
$shortcode .= ' sc_id_for_url='.$instance['sc_id_for_url'];
}
else {
$shortcode .= ' link_to_event=false';
}
$shortcode .= ']';
echo apply_filters('widget_text', do_shortcode($shortcode));
if('true' === $instance['link_to_page'] && $linked_page_is_set) {
echo '<div style="clear:both"><a title="'.$instance['link_to_page_caption'].'" href="'.$instance[ 'url_to_page'].'">'.$instance['link_to_page_caption'].'</a></div>';
}
echo $args['after_widget'];
}
/**
* Sanitize widget form values as they are saved.
*
* @see WP_Widget::update()
*
* @param array $new_instance Values just sent to be saved.
* @param array $old_instance Previously saved values from database.
*
* @return array Updated values to be saved.
*/
public function update($new_instance, $old_instance) {
$instance = array();
foreach($this->items as $itemname => $item) {
if('checkbox' === $item['type']) {
$instance[$itemname] = (isset($new_instance[$itemname]) && 1==$new_instance[$itemname]) ? 'true' : 'false';
}
else { // 'text'
$instance[$itemname] = strip_tags($new_instance[$itemname]);
}
}
return $instance;
}
/**
* Back-end widget form.
*
* @see WP_Widget::form()
*
* @param array $instance Previously saved values from database.
*/
public function form($instance) {
$this->upgrade_widget($instance);
$out = '';
foreach($this->items as $itemname => $item) {
if(! isset($instance[$itemname])) {
$instance[$itemname] = $item['std_value'];
}
$style_text = (null===$item['form_style']) ? '' : ' style="'.$item['form_style'].'"';
if('checkbox' === $item['type']) {
$checked_text = ('true'===$instance[$itemname] || 1==$instance[$itemname]) ? 'checked = "checked" ' : '';
$out .= '
<p'.$style_text.' title="'.$item['tooltip'].'">
<label><input class="widefat" id="'.$this->get_field_id($itemname).'" name="'.$this->get_field_name($itemname).'" type="checkbox" '.$checked_text.'value="1" /> '.$item['caption'].'</label>
</p>';
}
else { // 'text'
$width_text = (null === $item['form_width']) ? '' : 'style="width:'.$item['form_width'].'px" ';
$caption_after_text = (null === $item['caption_after']) ? '' : '<label>'.$item['caption_after'].'</label>';
$out .= '
<p'.$style_text.' title="'.$item['tooltip'].'">
<label for="'.$this->get_field_id($itemname).'">'.$item['caption'].' </label>
<input '.$width_text.'class="widefat" id="'.$this->get_field_id($itemname).'" name="'.$this->get_field_name($itemname).'" type="text" value="'.esc_attr($instance[$itemname]).'" />'.$caption_after_text.'
</p>';
}
}
echo $out;
}
/**
* Prepare the instance array and add not available items with std_value
*
* This is required for a plugin upgrades: In existing widgets laster added widget options are not available.
*
* @param array &$instance Previously saved values from database.
*/
private function prepare_instance(&$instance) {
foreach($this->items as $itemname => $item) {
if(!isset($instance[$itemname])) {
$instance[$itemname] = $item['std_value'];
}
}
}
/**
* Upgrades which are required due to modifications in the widget args
*
* @param array $instance Values from the database
* @param bool $on_frontpage true if the frontpage is displayed, false if the admin page is displayed
*/
private function upgrade_widget(&$instance, $on_frontpage=false) {
$upgrade_required = false;
// default cat_filter value in version 0.6.0 (can be removed in 1.0.0)
if(isset($instance['cat_filter']) && 'none' === $instance['cat_filter']) {
$instance['cat_filter'] = 'all';
$upgrade_required = true;
}
// renamed items "show_details" -> "show_content"
if(isset($instance['show_details']) && !isset($instance['show_content'])) {
$instance['show_content'] = $instance['show_details'];
$upgrade_required = true;
}
// renamed items "details_length" -> "content_length"
if(isset($instance['details_length']) && !isset($instance['content_length'])) {
$instance['content_length'] = $instance['details_length'];
$upgrade_required = true;
}
// Show info for the required update on admin page
if($upgrade_required && !$on_frontpage && current_user_can('edit_theme_options')) {
echo '<p style="color:red"><strong>This widget is old and requires an update! Please press "Save" to execute the required modifications!</strong></p>';
}
}
}
?>