AbstractDashboard.php

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<?php
namespace Magento\Backend\Block\Dashboard;

use Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection;

abstract class AbstractDashboard extends \Magento\Backend\Block\Widget
{
    protected $_dataHelper = null;

    protected $_collectionFactory;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Reports\Model\ResourceModel\Order\CollectionFactory $collectionFactory,
        array $data = []
    ) {
        $this->_collectionFactory = $collectionFactory;
        parent::__construct($context, $data);
    }

    public function getCollection()
    {
        return $this->getDataHelper()->getCollection();
    }

    public function getCount()
    {
        return $this->getDataHelper()->getCount();
    }

    public function getDataHelper()
    {
        return $this->_dataHelper;
    }

    protected function _prepareData()
    {
        return $this;
    }

    protected function _prepareLayout()
    {
        $this->_prepareData();
        return parent::_prepareLayout();
    }
}