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<?php
/**
* Likes plugin
*
*/
elgg_register_event_handler('init', 'system', 'likes_init');
function likes_init() {
elgg_extend_view('css/elgg', 'likes/css');
// registered with priority < 500 so other plugins can remove likes
elgg_register_plugin_hook_handler('register', 'menu:river', 'likes_river_menu_setup', 400);
elgg_register_plugin_hook_handler('register', 'menu:entity', 'likes_entity_menu_setup', 400);
$actions_base = elgg_get_plugins_path() . 'likes/actions/likes';
elgg_register_action('likes/add', "$actions_base/add.php");
elgg_register_action('likes/delete', "$actions_base/delete.php");
}
/**
* Add likes to entity menu at end of the menu
*/
function likes_entity_menu_setup($hook, $type, $return, $params) {
if (elgg_in_context('widgets')) {
return $return;
}
$entity = $params['entity'];
// likes
$options = array(
'name' => 'likes',
'text' => elgg_view('likes/display', array('entity' => $entity)),
'href' => false,
'priority' => 1000,
);
$return[] = ElggMenuItem::factory($options);
return $return;
}
/**
* Add a like button to river actions
*/
function likes_river_menu_setup($hook, $type, $return, $params) {
if (elgg_is_logged_in()) {
$item = $params['item'];
$object = $item->getObjectEntity();
if (!elgg_in_context('widgets') && $item->annotation_id == 0) {
if ($object->canAnnotate(0, 'likes')) {
if (!elgg_annotation_exists($object->getGUID(), 'likes')) {
// user has not liked this yet
$url = "action/likes/add?guid={$object->getGUID()}";
$options = array(
'name' => 'like',
'href' => $url,
'text' => elgg_echo('likes:likethis'),
'is_action' => true,
'priority' => 100,
);
} else {
// user has liked this
$likes = elgg_get_annotations(array(
'guid' => $object->getGUID(),
'annotation_name' => 'likes',
'annotation_owner_guid' => elgg_get_logged_in_user_guid()
));
$url = elgg_get_site_url() . "action/likes/delete?annotation_id={$likes[0]->id}";
$options = array(
'name' => 'like',
'href' => $url,
'text' => elgg_echo('likes:remove'),
'is_action' => true,
'priority' => 100,
);
}
$return[] = ElggMenuItem::factory($options);
}
}
}
return $return;
}
/**
* Count how many people have liked an entity.
*
* @param ElggEntity $entity
*
* @return int Number of likes
*/
function likes_count($entity) {
$type = $entity->getType();
$params = array('entity' => $entity);
$number = elgg_trigger_plugin_hook('likes:count', $type, $params, false);
if ($number) {
return $number;
} else {
return $entity->countAnnotations('likes');
}
}
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