StepsWizard.php

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<?php
namespace Magento\Ui\Block\Component;

class StepsWizard extends \Magento\Framework\View\Element\Template
{
    protected $_template = 'Magento_Ui::stepswizard.phtml';

    protected $initData = [];

    private $steps;

    public function getSteps()
    {
        if ($this->steps === null) {
            foreach ($this->getLayout()->getChildBlocks($this->getNameInLayout()) as $step) {
                if ($step instanceof StepsWizard\StepInterface) {
                    $this->steps[$step->getComponentName()] = $step;
                }
            }
        }
        return $this->steps;
    }

    // @codeCoverageIgnoreStart

    public function getStepComponents()
    {
        return array_keys($this->getSteps());
    }

    public function getComponentName()
    {
        return $this->getNameInLayout();
    }

    public function getInitData()
    {
        return $this->initData;
    }

    public function setInitData($initData)
    {
        $this->initData = $initData;

        return $this;
    }
}