[TASK] Implement page view override

In addition to the base functionality for JavaScript, this adds the
default override of the PageBackendView partial.

Move the extension enabled ViewHelper to deepl_base.

Register respective Event Listeners for generating the translation
dropdowns for available languages.

Author: calien666

Classes/Event/Listener/RenderPageViewLocalizationDropdownEventListener.php

@@ -0,0 +1,79 @@
+<?php
+
+declare(strict_types=1);
+
+namespace WebVision\Deepltranslate\Core\Event\Listener;
+
+use TYPO3\CMS\Backend\View\PageLayoutContext;
+use WebVision\Deepl\Base\Event\ViewHelpers\ModifyInjectVariablesViewHelperEvent;
+use WebVision\Deepltranslate\Core\Utility\DeeplBackendUtility;
+
+final class RenderPageViewLocalizationDropdownEventListener
+{
+    public function __invoke(ModifyInjectVariablesViewHelperEvent $event): void
+    {
+        if ($event->getIdentifier() !== 'languageTranslationDropdown') {
+            return;
+        }
+        $translationPartials = $event->getLocalVariableProvider()->get('translationPartials');
+        if ($translationPartials === null) {
+            $translationPartials = [];
+        }
+        $translationPartials[20] = 'Translation/DeeplTranslationDropdown';
+        $event->getLocalVariableProvider()->add('translationPartials', $translationPartials);
+
+        $deeplTranslateLanguages = [];
+        $event->getLocalVariableProvider()->add('deeplLanguages', []);
+        /** @var PageLayoutContext|null $context */
+        $context = $event->getGlobalVariableProvider()->get('context');
+        if ($context === null) {
+            return;
+        }
+
+        foreach ($context->getSiteLanguages() as $siteLanguage) {
+            if (
+                $siteLanguage->getLanguageId() != -1
+                && $siteLanguage->getLanguageId() != 0
+            ) {
+                if (!DeeplBackendUtility::checkCanBeTranslated(
+                    $context->getPageId(),
+                    $siteLanguage->getLanguageId()
+                )
+                ) {
+                    continue;
+                }
+                $deeplTranslateLanguages[$siteLanguage->getTitle()] = $siteLanguage->getLanguageId();
+            }
+        }
+        if ($deeplTranslateLanguages === []) {
+            return;
+        }
+        $options = [];
+        foreach ($context->getNewLanguageOptions() as $key => $possibleLanguage) {
+            if ($key === 0) {
+                continue;
+            }
+            if (!array_key_exists($possibleLanguage, $deeplTranslateLanguages)) {
+                continue;
+            }
+            $parameters = [
+                'justLocalized' => 'pages:' . $context->getPageId() . ':' . $deeplTranslateLanguages[$possibleLanguage],
+                'returnUrl' => $GLOBALS['TYPO3_REQUEST']->getAttribute('normalizedParams')->getRequestUri(),
+            ];
+
+            $redirectUrl = DeeplBackendUtility::buildBackendRoute('record_edit', $parameters);
+            $params = [];
+            $params['redirect'] = $redirectUrl;
+            $params['cmd']['pages'][$context->getPageId()]['deepltranslate'] = $deeplTranslateLanguages[$possibleLanguage];
+
+            $targetUrl = DeeplBackendUtility::buildBackendRoute('tce_db', $params);
+
+            $options[$targetUrl] = $possibleLanguage;
+        }
+
+        if ($options === []) {
+            return;
+        }
+        $event->getLocalVariableProvider()->add('deeplLanguages', $options);
+    }
+}

Classes/ViewHelpers/Be/ExtensionActiveViewHelper.php

@@ -7,8 +7,18 @@
 use TYPO3\CMS\Backend\Routing\Exception\RouteNotFoundException;
 use TYPO3\CMS\Backend\View\PageLayoutContext;
 use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;
+use WebVision\Deepl\Base\Event\ViewHelpers\ModifyInjectVariablesViewHelperEvent;
+use WebVision\Deepltranslate\Core\Event\Listener\RenderPageViewLocalizationDropdownEventListener;
 use WebVision\Deepltranslate\Core\Utility\DeeplBackendUtility;
 
+/**
+ * @deprecated Will be removed in the next major release
+ *
+ * This viewHelper is deprecated, as the registration is now done by the deepl_base
+ * event and directly registered during the EventListener invocation.
+ * @see RenderPageViewLocalizationDropdownEventListener
+ * @see ModifyInjectVariablesViewHelperEvent
+ */
 final class DeeplTranslateViewHelper extends AbstractViewHelper
 {
 
@@ -28,6 +38,10 @@ public function initializeArguments(): void
      */
     public function render(): array
     {
+        trigger_error(
+            'This ViewHelper is deprecated and should no longer be used',
+            E_USER_DEPRECATED
+        );
         $options = [];
         /** @var PageLayoutContext $context */
         $context = $this->arguments['context'];

Classes/ViewHelpers/DeeplTranslateViewHelper.php

@@ -67,3 +67,10 @@ services:
         identifier: 'deepltranslate-core/deepltranslate-core-localization-modes-process'
         event: WebVision\Deepl\Base\Event\LocalizationProcessPrepareDataHandlerCommandMapEvent
         after: 'deepl-base/process-default-typo3-localization-modes'
+
+  WebVision\Deepltranslate\Core\Event\Listener\RenderPageViewLocalizationDropdownEventListener:
+    tags:
+      - name: 'event.listener'
+        identifier: 'deepltranslate-core/translation-dropdown'
+        event: WebVision\Deepl\Base\Event\ViewHelpers\ModifyInjectVariablesViewHelperEvent
+        after: 'deepl-base/default-translation'

Configuration/Services.yaml

@@ -0,0 +1,25 @@
+<html
+    data-namespace-typo3-fluid="true"
+    xmlns:deepl="http://typo3.org/ns/WebVision/Deepltranslate/Core/ViewHelpers"
+    xmlns:f="http://typo3.org/ns/TYPO3Fluid/Fluid/ViewHelpers"
+    xmlns:core="http://typo3.org/ns/TYPO3/CMS/Core/ViewHelpers"
+    xmlns:be="http://typo3.org/ns/TYPO3/CMS/Backend/ViewHelpers"
+>
+<f:if condition="{context.newLanguageOptions}">
+    <deepl:be.access.deeplTranslateAllowed>
+        <f:if condition="{deeplLanguages -> f:count()} > 0">
+            <div class="col row">
+                <label class="col-sm-4 col">{f:translate(key: 'backend.label', extensionName: 'deepltranslate_core')}</label>
+                <div class="col col-sm-8">
+                    <select class="form-select" name="createNewLanguage" data-global-event="change" data-action-navigate="$value">
+                        <option><f:translate key="backend.label" extensionName="deepltranslate_core" /></option>
+                        <f:for each="{deeplLanguages}" as="languageName" key="url">
+                            <option value="{url}">{languageName}</option>
+                        </f:for>
+                    </select>
+                </div>
+            </div>
+        </f:if>
+    </deepl:be.access.deeplTranslateAllowed>
+</f:if>
+</html>