Constructs a WidgetPluginManager object.
public function __construct() {
$this->discovery = new AnnotatedClassDiscovery('field', 'widget');
$this->discovery = new WidgetLegacyDiscoveryDecorator($this->discovery);
$this->discovery = new ProcessDecorator($this->discovery, array(
$this,
'processDefinition',
));
$this->discovery = new AlterDecorator($this->discovery, 'field_widget_info');
$this->discovery = new CacheDecorator($this->discovery, 'field_widget_types', 'field');
$this->factory = new WidgetFactory($this);
}