Using method from library included by use - php

Question

I need to use method from Nette library, that I'm including by use command. But it doesn't work as I want to, throws fatal error, that I am calling undefined method.
How should I approach that method to make it work? Stupid question, but I am kinda new to OOP...
Method from class PresenterComponent.php
public function getPresenter($need = TRUE)
{
return $this->lookup('Nette\Application\UI\Presenter', $need);
}
And my code, where I need to use that method:
use Nette\Application\UI\PresenterComponent;
class DatabaseCollectionAdapter extends ArrayDataAdapter
{
// ..... some code......
$this->user = $this->getPresenter()->getUser();
Error:
Fatal Error
Call to undefined method Ctech\Gridator\DataAdapter\DatabaseCollectionAdapter::getPresenter()

Answer 1

change this
$this->user = $this->getPresenter()->getUser();
to this:
$object = new yourObject(); // yourObject extends PresenterComponent
$this->user = $object->getPresenter()->getUser();

Answer 2

use Nette\Application\UI\PresenterComponent; does not include or do any kind of magic to make it's functions available on the fly.
https://secure.php.net/manual/de/language.namespaces.importing.php
It's just a shorthand that helps you to use PresenterComponent directly without specifying the whole namespace.
Your DatabaseCollectionAdapter or ArrayDataAdapter has to have a function that looks like this:
class AdapterClass
public function getPresenter() {
return new Nette\Application\UI\PresenterComponent;
}
}
or something like this
use Nette\Application\UI\PresenterComponent;
class AdapterClass
public function getPresenter() {
return new PresenterComponent;
}
}