Config.php

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<?php
namespace Magento\Widget\Model\Widget;

class Config implements \Magento\Framework\Data\Wysiwyg\ConfigProviderInterface
{
    protected $_assetRepo;

    protected $_widget;

    protected $_backendUrl;

    protected $urlDecoder;

    protected $_widgetFactory;

    protected $urlEncoder;

    private $registry;

    public function __construct(
        \Magento\Backend\Model\UrlInterface $backendUrl,
        \Magento\Framework\Url\DecoderInterface $urlDecoder,
        \Magento\Framework\View\Asset\Repository $assetRepo,
        \Magento\Widget\Model\WidgetFactory $widgetFactory,
        \Magento\Framework\Url\EncoderInterface $urlEncoder,
        \Magento\Framework\Registry $registry
    ) {
        $this->_backendUrl = $backendUrl;
        $this->urlDecoder = $urlDecoder;
        $this->_assetRepo = $assetRepo;
        $this->_widgetFactory = $widgetFactory;
        $this->urlEncoder = $urlEncoder;
        $this->registry = $registry;
    }

    public function getConfig(\Magento\Framework\DataObject $config) : \Magento\Framework\DataObject
    {
        $settings = $this->getPluginSettings($config);
        return $config->addData($settings);
    }

    public function getPluginSettings($config)
    {
        $widgetWysiwyg = [
            [
                'name' => 'magentowidget',
                'src' => $this->getWysiwygJsPluginSrc(),
                'options' => [
                    'window_url' => $this->getWidgetWindowUrl($config),
                    'types' => $this->getAvailableWidgets($config),
                    'error_image_url' => $this->getErrorImageUrl(),
                    'placeholders' => $this->getWidgetPlaceholderImageUrls(),
                ],
            ]
        ];

        $configPlugins = (array) $config->getData('plugins');

        $widgetConfig['plugins'] = array_merge($configPlugins, $widgetWysiwyg);
        return $widgetConfig;
    }

    public function getWidgetPlaceholderImageUrls()
    {
        return $this->_widgetFactory->create()->getPlaceholderImageUrls();
    }

    public function getErrorImageUrl()
    {
        return $this->_assetRepo->getUrl('Magento_Widget::error.png');
    }

    public function getWysiwygJsPluginSrc()
    {
        return $this->_assetRepo->getUrl('mage/adminhtml/wysiwyg/tiny_mce/plugins/magentowidget/editor_plugin.js');
    }

    public function getWidgetWindowUrl($config)
    {
        $params = [];

        $skipped = is_array($config->getData('skip_widgets')) ? $config->getData('skip_widgets') : [];
        if ($config->hasData('widget_filters')) {
            $all = $this->_widgetFactory->create()->getWidgets();
            $filtered = $this->_widgetFactory->create()->getWidgets($config->getData('widget_filters'));
            foreach ($all as $code => $widget) {
                if (!isset($filtered[$code])) {
                    $skipped[] = $widget['@']['type'];
                }
            }
        }

        if (count($skipped) > 0) {
            $params['skip_widgets'] = $this->encodeWidgetsToQuery($skipped);
        }
        return $this->_backendUrl->getUrl('adminhtml/widget/index', $params);
    }

    public function encodeWidgetsToQuery($widgets)
    {
        $widgets = is_array($widgets) ? $widgets : [$widgets];
        $param = implode(',', $widgets);
        return $this->urlEncoder->encode($param);
    }

    public function decodeWidgetsFromQuery($queryParam)
    {
        $param = $this->urlDecoder->decode($queryParam);
        return preg_split('/\s*\,\s*/', $param, 0, PREG_SPLIT_NO_EMPTY);
    }

    public function getAvailableWidgets($config)
    {
        if (!$config->hasData('widget_types')) {
            $result = [];
            $allWidgets = $this->_widgetFactory->create()->getWidgetsArray();
            $skipped = $this->_getSkippedWidgets();
            foreach ($allWidgets as $widget) {
                if (is_array($skipped) && in_array($widget['type'], $skipped)) {
                    continue;
                }
                $result[] = $widget['name']->getText();
            }
        }

        return $result;
    }

    protected function _getSkippedWidgets()
    {
        return $this->registry->registry('skip_widgets');
    }
}