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<?php
/**
* Elgg widgets library.
* Contains code for handling widgets.
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* Register a particular context for use with widgets.
*
* @param string $context The context we wish to enable context for
*/
function use_widgets($context) {
global $CONFIG;
if (!isset($CONFIG->widgets))
$CONFIG->widgets = new stdClass;
if (!isset($CONFIG->widgets->contexts)) {
$CONFIG->widgets->contexts = array();
}
if (!empty($context)) {
$CONFIG->widgets->contexts[] = $context;
}
}
/**
* When given a widget entity and a new requested location, saves the new location
* and also provides a sensible ordering for all widgets in that column
*
* @param ElggObject $widget The widget entity
* @param int $order The order within the column
* @param int $column The column (1 or 2)
* @return true|false Depending on success
*/
function save_widget_location(ElggObject $widget, $order, $column) {
if ($widget instanceof ElggObject) {
if ($widget->subtype == "widget") {
// If you can't move the widget, don't save a new location
if (!$widget->draggable)
return false;
// Sanitise the column value
if ($column != 1 || $column != 2)
$column = 1;
$widget->column = (int) $column;
$ordertmp = array();
if ($entities = get_entities_from_metadata_multi(array(
'context' => $widget->context,
'column' => $column,
),'object','widget')) {
foreach($entities as $entity) {
$entityorder = $entity->order;
if ($entityorder < $order) {
$ordertmp[$entityorder] = $entity;
}
if ($entityorder >= $order) {
$ordertmp[$entityorder + 10000] = $entity;
}
}
}
$ordertmp[$order] = $widget;
ksort($ordertmp);
$orderticker = 10;
foreach($ordertmp as $orderval => $entity) {
$entity->order = $orderticker;
$orderticker += 10;
}
return true;
}
}
return false;
}
/**
* Get widgets for a particular context and column, in order of display
*
* @param int $user_guid The owner user GUID
* @param string $context The context (profile, dashboard etc)
* @param int $column The column (1 or 2)
* @return array|false An array of widget ElggObjects, or false
*/
function get_widgets($user_guid, $context, $column) {
if ($widgets = get_user_objects_by_metadata($user_guid, "widget", array(
'column' => $column,
'location' => $context,
), 10000)) {
$widgetorder = array();
foreach($widgets as $widget) {
$widgetorder[$widget->order] = $widget;
}
return $widgetorder;
}
return false;
}
/**
* Displays a particular widget
*
* @param ElggObject $widget The widget to display
* @return string The HTML for the widget, including JavaScript wrapper
*/
function display_widget(ElggObject $widget) {
return elgg_view_entity($widget);
}
/**
* Add a new widget
*
* @param int $user_guid User GUID to associate this widget with
* @param string $handler The handler for this widget
* @param string $context The page context for this widget
* @param int $order The order to display this widget in
* @param int $column The column to display this widget in (1 or 2)
* @return true|false Depending on success
*/
function add_widget($user_guid, $handler, $context, $order = 0, $column = 1) {
if (empty($user_guid) || empty($context) || empty($handler) || !widget_type_exists($handler))
return false;
if ($user = get_user($user_guid)) {
$widget = new ElggObject;
$widget->handler = $handler;
$widget->context = $context;
if (!$widget->save())
return false;
return save_widget_location($widget, $order, $column);
}
return false;
}
/**
* Define a new widget type
*
* @param string $handler The identifier for the widget handler
* @param string $name The name of the widget type
* @param string $description A description for the widget type
* @return true|false Depending on success
*/
function add_widget_type($handler, $name, $description) {
if (!empty($handler) && !empty($name)) {
global $CONFIG;
if (!isset($CONFIG->widgets))
$CONFIG->widgets = new stdClass;
if (!isset($CONFIG->widgets->handlers))
$CONFIG->widgets->handlers = array();
$handlerobj = new stdClass;
$handlerobj->name = $name;
$handlerobj->description = $description;
$CONFIG->widgets->handlers[$handler] = $handlerobj;
return true;
}
return false;
}
/**
* Determines whether or not widgets with the specified handler have been defined
*
* @param string $handler The widget handler identifying string
* @return true|false Whether or not those widgets exist
*/
function widget_type_exists($handler) {
global $CONFIG;
if (!empty($CONFIG->widgets)
&& !empty($CONFIG->widgets->handlers)
&& is_array($CONFIG->widgets->handlers)
&& array_key_exists($handler, $CONFIG->widgets->handlers))
return true;
return false;
}
/**
* Returns an array of stdClass objects representing the defined widget types
*
* @return array A list of types defined (if any)
*/
function get_widget_types() {
global $CONFIG;
if (!empty($CONFIG->widgets)
&& !empty($CONFIG->widgets->handlers)
&& is_array($CONFIG->widgets->handlers)) {
return $CONFIG->widgets->handlers;
}
return array();
}
/**
* Saves a widget's settings (by passing an array of (name => value) pairs to save_{$handler}_widget)
*
* @param int $widget_guid The GUID of the widget we're saving to
* @param array $params An array of name => value parameters
*/
function save_widget_info($widget_guid, $params) {
if ($widget = get_entity($widget_guid)) {
if ($widget->subtype != "widget") return false;
$handler = $widget->handler;
if (empty($handler)) return false;
$function = "save_{$handler}_widget";
if (!is_callable($function)) return false;
return $function($params);
}
return false;
}
/**
* Function to initialise widgets functionality on Elgg init
*
*/
function widget_init() {
register_action('widgets/save');
}
// Register event
register_elgg_event_handler('init','system','widgets_init');
?>
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