Widget.php

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<?php
namespace Magento\Widget\Block\Adminhtml;

class Widget extends \Magento\Backend\Block\Widget\Form\Container
{
    protected function _construct()
    {
        parent::_construct();

        $this->_blockGroup = 'Magento_Widget';
        $this->_controller = 'adminhtml';
        $this->_mode = 'widget';
        $this->_headerText = __('Widget Insertion');

        $saveButtonClass = 'action-primary add-widget';
        $this->removeButton('back');
        if ($this->getRequest()->getParam('mode') === 'new') {
            $this->buttonList->update('save', 'label', __('Insert Widget'));
            $saveButtonClass .= ' disabled';
        }
        $this->buttonList->update('save', 'class', $saveButtonClass);
        $this->buttonList->update('save', 'id', 'insert_button');
        $this->buttonList->update('save', 'onclick', 'wWidget.insertWidget()');
        $this->buttonList->update('save', 'region', 'toolbar');
        $this->buttonList->update('save', 'data_attribute', []);
        $this->buttonList->update('reset', 'label', __('Cancel'));
        $this->buttonList->update('reset', 'onclick', 'wWidget.closeModal()');

        $this->_formScripts[] = <<<EOJS
require(['mage/adminhtml/wysiwyg/widget'], function() {
    wWidget = new WysiwygWidget.Widget(
        'widget_options_form',
        'select_widget_type',
        'widget_options',
        '{$this->getUrl('adminhtml/*/loadOptions')}',
        '{$this->escapeJs($this->getRequest()->getParam('widget_target_id'))}'
    );
});
EOJS;
    }
}