data aware widget with zf2 and doctrine

module.config.php

namespace MySlideshow;

return array(
    'service_manager' => array(
        'factories' => array(
            __NAMESPACE__ . '\SlideService' => __NAMESPACE__ . '\Service\SlideServiceFactory',
        ),
        'aliases' => array(
            'SlideService' => __NAMESPACE__ . '\SlideService',
        )
    ),
    'view_helpers' => array(
        'factories' => array(
            'slideShow' => __NAMESPACE__ . '\Service\SlideshowViewHelperFactory',
        ),
    ),
);

SlideEntity.php

<?php
/**
 * @author Stefano Torresi (http://stefanotorresi.it)
 * @license See the file LICENSE.txt for copying permission.
 * ************************************************
 */

namespace MySlideshow;

use MyBase\Entity\Entity;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 * @ORM\Table(name="mss_slides")
 */
class Slide extends Entity
{
    /**
     * @var string
     * @ORM\Column(type="string")
     */
    protected $file;

    /**
     * @var string
     * @ORM\Column(type="string", nullable=true)
     */
    protected $url;

    /**
     * The alternative text
     *
     * @var string
     * @ORM\Column(type="string", nullable=true)
     */
    protected $alt;

    /**
     * @param string $alt
     * @return $this
     */
    public function setAlt($alt)
    {
        $this->alt = $alt;

        return $this;
    }

    /**
     * @return string
     */
    public function getAlt()
    {
        return $this->alt;
    }

    /**
     * @param string $file
     * @return $this
     */
    public function setFile($file)
    {
        $this->file = $file;

        return $this;
    }

    /**
     * @return string
     */
    public function getFile()
    {
        return $this->file;
    }

    /**
     * @param string $url
     * @return $this
     */
    public function setUrl($url)
    {
        $this->url = $url;

        return $this;
    }

    /**
     * @return string
     */
    public function getUrl()
    {
        return $this->url;
    }
}

SlideService.php

<?php
/**
 * @author Stefano Torresi (http://stefanotorresi.it)
 * @license See the file LICENSE.txt for copying permission.
 * ************************************************
 */

namespace MySlideshow\Service;

use Doctrine\Common\Persistence\ObjectManager;
use Doctrine\Common\Persistence\ObjectRepository;
use MySlideshow\Slide;

class SlideService
{
    /**
     * @var ObjectManager
     */
    protected $objectManager;

    /**
     * @var ObjectRepository
     */
    protected $objectRepository;

    public function __construct(ObjectManager $objectManager)
    {
        $this->objectManager = $objectManager;
        $this->objectRepository = $objectManager->getRepository(Slide::fqcn());
    }

    /**
     * @param array $data
     * @return Slide
     */
    public function create($data)
    {
        $slide = new Slide();

        $slide->setFile(realpath($data['image-file']['tmp_name']));
        $slide->setAlt($data['alt']);
        $slide->setUrl($data['url']);

        $this->objectManager->persist($slide);
        $this->objectManager->flush();

        return $slide;
    }

    /**
     * @return mixed
     */
    public function findAll()
    {
        return $this->objectRepository->findAll();
    }

    /**
     * @param integer $id
     * @return object
     */
    public function find($id)
    {
        return $this->objectRepository->find($id);
    }

    /**
     * @param Slide $slide
     * @return $this
     */
    public function update(Slide $slide)
    {
        $this->objectManager->flush($slide);

        return $this;
    }

    /**
     * @param Slide $slide
     * @return $this
     */
    public function delete(Slide $slide)
    {
        $this->objectManager->remove($slide);
        $this->objectManager->flush();

        return $this;
    }
}

SlideServiceFactory.php

<?php
/**
 * @author Stefano Torresi (http://stefanotorresi.it)
 * @license See the file LICENSE.txt for copying permission.
 * ************************************************
 */

namespace MySlideshow\Service;

use Doctrine\Common\Persistence\ObjectManager;
use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class SlideServiceFactory implements FactoryInterface
{
    /**
     * Create service
     *
     * @param ServiceLocatorInterface $serviceLocator
     * @return SlideService
     */
    public function createService(ServiceLocatorInterface $serviceLocator)
    {
        /** @var ObjectManager $objectManager */
        $objectManager = $serviceLocator->get('Doctrine\ORM\EntityManager');
        $slideService = new SlideService($objectManager);

        return $slideService;
    }
}

SlideshowViewHelper.php

<?php
/**
 * @author Stefano Torresi (http://stefanotorresi.it)
 * @license See the file LICENSE.txt for copying permission.
 * ************************************************
 */

namespace MySlideshow;

use MySlideshow\Service\SlideService;
use Zend\View\Helper\AbstractHtmlElement;

class SlideshowViewHelper extends AbstractHtmlElement
{
    /**
     * @var SlideService
     */
    protected $slideService;

    /**
     * @var array
     */
    protected $options = array(
        'attributes' => array(
            'class' => 'slideshow',
        ),
        'slide_attributes' => array(
            'class' => 'slide',
        ),
        'image_attributes' => array(),
        'link_attributes' => array(),
        'resize_options' => array(),
    );

    /**
     * @param SlideService $slideService
     */
    public function __construct(SlideService $slideService)
    {
        $this->slideService = $slideService;
    }

    /**
     * @param array $options
     * @return $this
     */
    public function __invoke($options = array())
    {
        $this->options = array_merge_recursive($this->options, $options);

        return $this;
    }

    /**
     * @return string
     */
    public function openTag()
    {
        $this->getView()->inlineScript()
            ->appendFile($this->getView()->basePath('/js/vendor/myslider/jquery.myslider.js'));
        $this->getView()->headLink()
            ->appendStylesheet($this->getView()->basePath('/js/vendor/myslider/jquery.myslider.css'));

        $attributes = $this->htmlAttribs($this->options['attributes']);

        return sprintf("<div%s>", $attributes) . PHP_EOL;
    }

    /**
     * @return string
     */
    public function slides()
    {
        $slideAttribs = $this->options['slide_attributes'];
        $linkAttribs = $this->options['link_attributes'];

        $markup = '';
        foreach($this->getSlides() as $slide) /** @var Slide $slide */ {

            $slideAttribs['data-id'] = $slide->getId();

            $imgAttribs['src'] = $this->getView()->imageResize($slide->getFile(), $this->options['resize_options']);
            $imgAttribs['alt'] = $slide->getAlt();

            $linkAttribs['href'] = $slide->getUrl();

            // attributes passed via the helper options array do override actual image properties.
            $imgAttribs = array_merge($imgAttribs, $this->options['image_attributes']);

            $format = '<figure%s><img%s></figure>';

            $args = array(
                $this->htmlAttribs($slideAttribs),
                $this->htmlAttribs($imgAttribs)
            );

            if(!empty($linkAttribs['href'])) {
                $format = '<a%3$s>'.$format.'</a>';
                $args[] = $this->htmlAttribs($linkAttribs);
            }

            $markup .= vsprintf($format, $args) . PHP_EOL;
        }

        return $markup;
    }

    /**
     * Return a closing label tag
     *
     * @return string
     */
    public function closeTag()
    {
        return '</div>' . PHP_EOL;
    }

    /**
     * @return array
     */
    protected function getSlides()
    {
        $slides = $this->slideService->findAll();

        if (!$slides) {
            return array();
        }

        return $slides;
    }

    /**
     * @return string
     */
    public function __toString()
    {
        return $this->openTag() . $this->slides() . $this->closeTag();
    }

    /**
     * @param integer $width
     * @return $this
     */
    public function setWidth($width)
    {
        $this->options['resize_options']['width'] = $width;

        return $this;
    }

    /**
     * @param integer $height
     * @return $this
     */
    public function setHeight($height)
    {
        $this->options['resize_options']['height'] = $height;

        return $this;
    }

    /**
     * @param string $mode
     * @return $this
     */
    public function setMode($mode)
    {
        $this->options['resize_options']['mode'] = $mode;

        return $this;
    }
}

SlideshowViewHelperFactory.php

<?php
/**
 * @author Stefano Torresi (http://stefanotorresi.it)
 * @license See the file LICENSE.txt for copying permission.
 * ************************************************
 */

namespace MySlideshow\Service;

use MySlideshow\SlideshowViewHelper;
use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class SlideshowViewHelperFactory implements FactoryInterface
{

    /**
     * Create service
     *
     * @param ServiceLocatorInterface $serviceLocator
     * @return SlideshowViewHelper
     */
    public function createService(ServiceLocatorInterface $serviceLocator)
    {
        $slideService = $serviceLocator->getServiceLocator()->get('SlideService');

        $helper = new SlideshowViewHelper($slideService);

        return $helper;
    }
}