Contao 4: Dependency Injection - AcmeElement.php

AcmeElement.php

<?php
class AcmeElement extends \ContentElement
{
    /**
     * Template
     * @var string
     */
    protected $strTemplate = 'ce_esit_default';

    /**
     * Generate the content element
     */
    protected function compile()
    {
        if (TL_MODE == 'BE') {
            $this->strTemplate          = 'be_wildcard';
            $this->Template             = new \BackendTemplate($this->strTemplate);
            $this->Template->wildcard   = "### AcmeElement ###";
        } else {
            $greeter = \Contao\System::getContainer()->get('acme_test.greeter');
            $greeter->greet();
        }
    }
}