silverstripe-framework/widgets/Widget.php

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<?php
/**
* Widgets let CMS authors drag and drop small pieces of functionality into
* defined areas of their websites.
*
* ## Forms
* You can use forms in widgets by implementing a {@link Widget_Controller}.
* See {@link Widget_Controller} for more information.
*
* @package sapphire
* @subpackage widgets
*/
class Widget extends DataObject {
static $db = array(
"Sort" => "Int"
);
static $has_one = array(
"Parent" => "WidgetArea",
);
static $has_many = array();
static $many_many = array();
static $belongs_many_many = array();
static $defaults = array();
static $default_sort = "Sort";
static $title = "Widget Title";
static $cmsTitle = "Name of this widget";
static $description = "Description of what this widget does.";
function getCMSFields() {
return new FieldSet();
}
/**
* Note: Overloaded in {@link Widget_Controller}.
*
* @return string HTML
*/
function WidgetHolder() {
return $this->renderWith("WidgetHolder");
}
/**
* Renders the widget content in a custom template with the same name as the current class.
* This should be the main point of output customization.
*
* Invoked from within WidgetHolder.ss, which contains
* the "framing" around the custom content, like a title.
*
* Note: Overloaded in {@link Widget_Controller}.
*
* @return string HTML
*/
function Content() {
return $this->renderWith(array_reverse(ClassInfo::ancestry($this->class)));
}
function Title() {
return Object::get_static($this->class, 'title');
}
function CMSTitle() {
return Object::get_static($this->class, 'cmsTitle');
}
function Description() {
return Object::get_static($this->class, 'description');
}
function DescriptionSegment() {
return $this->renderWith('WidgetDescription');
}
/**
* @see Widget_Controller->editablesegment()
*/
function EditableSegment() {
return $this->renderWith('WidgetEditor');
}
function CMSEditor() {
$output = '';
$fields = $this->getCMSFields();
foreach($fields as $field) {
$name = $field->Name();
$field->setValue($this->getField($name));
$renderedField = $field->FieldHolder();
$renderedField = ereg_replace("name=\"([A-Za-z0-9\-_]+)\"", "name=\"Widget[" . $this->ID . "][\\1]\"", $renderedField);
$renderedField = ereg_replace("id=\"([A-Za-z0-9\-_]+)\"", "id=\"Widget[" . $this->ID . "][\\1]\"", $renderedField);
$output .= $renderedField;
}
return $output;
}
function ClassName() {
return $this->class;
}
function Name() {
return "Widget[".$this->ID."]";
}
function populateFromPostData($data) {
foreach($data as $name => $value) {
if($name != "Type") {
$this->setField($name, $value);
}
}
$this->write();
// The field must be written to ensure a unique ID.
$this->Name = $this->class.$this->ID;
$this->write();
}
}
/**
* Optional controller for every widget which has its own logic,
* e.g. in forms. It always handles a single widget, usually passed
* in as a database identifier through the controller URL.
* Needs to be constructed as a nested controller
* within a {@link ContentController}.
*
* ## Forms
* You can add forms like in any other sapphire controller.
* If you need access to the widget from within a form,
* you can use `$this->controller->getWidget()` inside the form logic.
* Note: Widget controllers currently only work on {@link Page} objects,
* because the logic is implemented in {@link ContentController->handleWidget()}.
* Copy this logic and the URL rules to enable it for other controllers.
*
* @package sapphire
* @subpackage widgets
*/
class Widget_Controller extends Controller {
/**
* @var Widget
*/
protected $widget;
function __construct($widget = null) {
// TODO This shouldn't be optional, is only necessary for editablesegment()
if($widget) {
$this->widget = $widget;
$this->failover = $widget;
}
parent::__construct();
}
function Link() {
return Controller::join_links(
Controller::curr()->Link(),
'widget',
($this->widget) ? $this->widget->ID : null
);
}
/**
* @return Widget
*/
function getWidget() {
return $this->widget;
}
/**
* Overloaded from {@link Widget->Content()}
* to allow for controller/form linking.
*
* @return string HTML
*/
function Content() {
return $this->renderWith(array_reverse(ClassInfo::ancestry($this->widget->class)));
}
/**
* Overloaded from {@link Widget->WidgetHolder()}
* to allow for controller/form linking.
*
* @return string HTML
*/
function WidgetHolder() {
return $this->renderWith("WidgetHolder");
}
/**
* Uses the `WidgetEditor.ss` template and {@link Widget->editablesegment()}
* to render a administrator-view of the widget. It is assumed that this
* view contains form elements which are submitted and saved through {@link WidgetAreaEditor}
* within the CMS interface.
*
* @return string HTML
*/
function editablesegment() {
$className = $this->urlParams['ID'];
if(class_exists($className) && is_subclass_of($className, 'Widget')) {
$obj = new $className();
return $obj->EditableSegment();
} else {
user_error("Bad widget class: $className", E_USER_WARNING);
return "Bad widget class name given";
}
}
}
?>