Edit.php

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<?php
namespace Magento\Variable\Block\System\Variable;

class Edit extends \Magento\Backend\Block\Widget\Form\Container
{
    protected $_coreRegistry = null;

    public function __construct(
        \Magento\Backend\Block\Widget\Context $context,
        \Magento\Framework\Registry $registry,
        array $data = []
    ) {
        $this->_coreRegistry = $registry;
        parent::__construct($context, $data);
    }

    protected function _construct()
    {
        $this->_objectId = 'variable_id';
        $this->_blockGroup = 'Magento_Variable';
        $this->_controller = 'system_variable';

        parent::_construct();
    }

    public function getVariable()
    {
        return $this->_coreRegistry->registry('current_variable');
    }

    protected function _preparelayout()
    {
        $this->addButton(
            'save_and_edit',
            [
                'label' => __('Save and Continue Edit'),
                'class' => 'save',
                'data_attribute' => [
                    'mage-init' => ['button' => ['event' => 'saveAndContinueEdit', 'target' => '#edit_form']],
                ]
            ],
            100
        );
        if (!$this->getVariable()->getId()) {
            $this->removeButton('delete');
        }
        return parent::_prepareLayout();
    }

    public function getFormHtml()
    {
        return parent::getFormHtml();
    }

    public function getHeaderText()
    {
        if ($this->getVariable()->getId()) {
            return __('Custom Variable "%1"', $this->escapeHtml($this->getVariable()->getName()));
        } else {
            return __('New Custom Variable');
        }
    }

    public function getValidationUrl()
    {
        return $this->getUrl('adminhtml/*/validate', ['_current' => true]);
    }

    public function getSaveUrl()
    {
        return $this->getUrl('adminhtml/*/save', ['_current' => true, 'back' => null]);
    }

    public function getSaveAndContinueUrl()
    {
        return $this->getUrl('adminhtml/*/save', ['_current' => true, 'back' => 'edit']);
    }
}