class.ilPageObjectGUI.php

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<?php
 
use ILIAS\COPage\Editor\EditSessionRepository;
use ILIAS\COPage\Page\EditGUIRequest;
use ILIAS\User\Profile\PublicProfileGUI;
 
class ilPageObjectGUI
{
    public const PRESENTATION = "presentation";
    public const EDIT = "edit";
    public const PREVIEW = "preview";
    public const OFFLINE = "offline";
    public const PRINTING = "print";
    protected \ILIAS\TestQuestionPool\Questions\PublicInterface $questioninfo;
    protected \ILIAS\COPage\Page\PageManager $pm;
    protected \ILIAS\COPage\Link\LinkManager $link;
    protected \ILIAS\COPage\InternalGUIService $gui;
    protected \ILIAS\COPage\PC\PCDefinition $pc_definition;
    protected \ILIAS\COPage\Xsl\XslManager $xsl;
    protected \ILIAS\COPage\Editor\GUIService $editor_gui;
    protected \ILIAS\Notes\Service $notes;
    protected int $requested_ref_id;
    protected int $requested_pg_id;
    protected string $requested_file_id;
    protected string $requested_transl;
    protected int $requested_old_nr;
    protected EditGUIRequest $request;
    protected EditSessionRepository $edit_repo;
    protected string $exp_target_script = "";
    protected string $exp_id = "";
    protected string $exp_frame = "";
    protected string $act_meth = "";
    protected object $act_obj;
    public string $page_back_title = "";
    protected int $notes_parent_id = 0;
    protected ilPropertyFormGUI $form;
    protected int $styleid = 0;
    protected bool $enabledpagefocus;
    protected string $link_xml;
    protected int $old_nr = 0;
 
    protected int $id;
    protected string $language;
    protected ilGlobalTemplateInterface $tpl;
    protected ilLanguage $lng;
    protected ilCtrl $ctrl;
    protected ilTabsGUI $tabs_gui;
    protected ilAccessHandler $access;
    protected ilLogger $log;
    protected ilObjUser $user;
    protected ilHelpGUI $help;
    public ilPageObject $obj;
    protected string $output_mode = "";
    public string $presentation_title = "";
    public string $target_script = "";
    public string $return_location = "";
    public string $target_var = "";
    public string $template_output_var = "";
    public bool $output2template = false;
    public string $link_params = "";
    public string $sourcecode_download_script = "";
    public bool $activation = false;
    public bool $activated = true;
    public bool $editpreview = false;
    public bool $use_meta_data = false;
    public ?ilObject $meta_data_rep_obj = null;
    public int $meta_data_sub_obj_id = 0;
    public string $meta_data_type = "";
    public ?object $meta_data_observer_obj = null;
    public string $meta_data_observer_func = "";
    public bool $link_xml_set = false;
    public bool $enableediting = true;
    public bool $rawpagecontent = false;
    public bool $enabledcontentincludes = false;
    public bool $compare_mode = false;
    public ?ilPageConfig $page_config = null;
    public bool $tabs_enabled = true;
    public bool $render_page_container = false;
    private bool $abstract_only = false;
    protected string $parent_type = "";
    protected string $file_download_link = '';
    protected string $fullscreen_link = '';
    protected string $link_frame = '';
    protected \ILIAS\GlobalScreen\ScreenContext\ContextServices $tool_context;
    public string $pl_start = "{{{{{";
    public string $pl_end = "}}}}}";
    protected \ILIAS\DI\UIServices $ui;
    protected \ILIAS\COPage\PageLinker $page_linker;
    protected string $abstract_pcid = "";   // pcid of single paragraph
    protected ilToolbarGUI $toolbar;
    protected string $open_place_holder = "";
    protected int $requested_user_id = 0;
    protected int $requested_q_id = 0;
    protected int $requested_history_mode = 0;
    protected bool $enabled_news = false;
    protected int $news_obj_id = 0;
    protected string $news_obj_type = "";
    protected ?array $tab_hook = null;
    protected string $view_page_link = "";
    protected string $view_page_target = "";
    protected string $offline_directory = "";
    protected bool $notes_enabled = false;
    protected string $prependinghtml = "";
    protected string $header = "";
    protected string $int_link_return = "";
    protected bool $enabled_href = true;
    // $adv_ref_id - $adv_type - $adv_subtype:
    // Object, that defines the adv md records being used.
    protected ?int $adv_ref_id = null;
    protected ?string $adv_type = null;
    protected ?string $adv_subtype = null;
    protected string $concrete_lang = "";
    protected string $profile_back_url = "";
 
    protected ilComponentFactory $component_factory;
    protected \ILIAS\COPage\Compare\PageCompare $compare;
 
    public function __construct(
        string $a_parent_type,
        int $a_id,
        int $a_old_nr = 0,
        bool $a_prevent_get_id = false,
        string $a_lang = "",
        string $concrete_lang = ""
    ) {
        global $DIC;
 
        $this->log = ilLoggerFactory::getLogger('copg');
        $this->tpl = $DIC->ui()->mainTemplate();
        $this->ctrl = $DIC->ctrl();
        $this->lng = $DIC->language();
        $this->tabs_gui = $DIC->tabs();
        $this->access = $DIC->access();
        $this->user = $DIC->user();
        $this->help = $DIC["ilHelp"];
        $this->ui = $DIC->ui();
        $this->toolbar = $DIC->toolbar();
        $this->component_factory = $DIC["component.factory"];
 
        $this->request = $DIC
            ->copage()
            ->internal()
            ->gui()
            ->page()
            ->editRequest();
 
        $this->questioninfo = $DIC->testQuestion();
 
        $this->requested_old_nr = $this->request->getInt("old_nr");
        $this->requested_transl = $this->request->getString("transl");
        $this->requested_file_id = $this->request->getString("file_id");
        $this->requested_ref_id = $this->request->getInt("ref_id");
        $this->requested_pg_id = $this->request->getInt("pg_id");
        $this->concrete_lang = $concrete_lang;
 
        $this->setParentType($a_parent_type);
        $this->setId($a_id);
        if ($a_old_nr == 0 && !$a_prevent_get_id && $this->requested_old_nr > 0) {
            $a_old_nr = $this->requested_old_nr;
        }
        $this->setOldNr($a_old_nr);
 
        if ($a_lang == "" && $this->requested_transl != '') {
            $this->setLanguage($this->requested_transl);
        } else {
            if ($a_lang == "") {
                $a_lang = "-";
            }
            $this->setLanguage($a_lang);
        }
 
 
        $this->setOutputMode(self::PRESENTATION);
        $this->setEnabledPageFocus(true);
        $this->initPageObject();
        $this->setPageConfig($this->getPageObject()->getPageConfig());
 
        $this->page_linker = new ilPageLinker(get_class($this));
 
        $this->output2template = true;
 
        $this->template_output_var = "PAGE_CONTENT";
        $this->page_back_title = $this->lng->txt("page");
        $this->lng->loadLanguageModule("content");
        $this->lng->loadLanguageModule("copg");
 
        $this->tool_context = $DIC->globalScreen()->tool()->context();
 
        $this->setTemplateOutput(false);
 
        $this->ctrl->saveParameter($this, "transl");
 
 
        $this->requested_user_id = $this->request->getInt("user");
        $this->requested_q_id = $this->request->getInt("q_id");
        $this->requested_history_mode = $this->request->getInt("history_mode");
 
        $int_service = $DIC
            ->copage()
            ->internal();
 
        $this->edit_repo = $int_service
            ->repo()
            ->edit();
 
        $this->afterConstructor();
        $this->xsl = $int_service->domain()->xsl();
        $this->compare = $int_service->domain()->compare();
        $this->pc_definition = $DIC
            ->copage()
            ->internal()
            ->domain()
            ->pc()
            ->definition();
        $this->gui = $DIC->copage()->internal()->gui();
        $this->link = $DIC->copage()->internal()->domain()->link();
        $this->pm = $DIC->copage()->internal()->domain()->page();
        $this->editor_gui = $DIC->copage()->internal()->gui()->edit();
        $this->notes = $DIC->notes();
    }
 
    public function setTemplate(ilGlobalTemplateInterface $main_tpl): void
    {
        $this->tpl = $main_tpl;
    }
 
    public function afterConstructor(): void
    {
    }
 
    public function setAdvMdRecordObject(
        int $a_adv_ref_id,
        string $a_adv_type,
        string $a_adv_subtype = "-"
    ): void {
        $this->adv_ref_id = $a_adv_ref_id;
        $this->adv_type = $a_adv_type;
        $this->adv_subtype = $a_adv_subtype;
    }
 
    public function getAdvMdRecordObject(): ?array
    {
        if ($this->adv_type === null) {
            return null;
        }
        return [$this->adv_ref_id, $this->adv_type, $this->adv_subtype];
    }
 
    final protected function initPageObject(): void
    {
        $page = ilPageObjectFactory::getInstance(
            $this->getParentType(),
            $this->getId(),
            $this->getOldNr(),
            $this->getLanguage()
        );
        $page->setConcreteLang($this->concrete_lang);
        $this->setPageObject($page);
    }
 
    public function setParentType(string $a_val): void
    {
        $this->parent_type = $a_val;
    }
 
    public function getParentType(): string
    {
        return $this->parent_type;
    }
 
    public function setId(int $a_val): void
    {
        $this->id = $a_val;
    }
 
    public function getId(): int
    {
        return $this->id;
    }
 
    public function setOldNr(int $a_val): void
    {
        $this->old_nr = $a_val;
    }
 
    public function getOldNr(): int
    {
        return $this->old_nr;
    }
 
    public function setLanguage(string $a_val): void
    {
        $this->language = $a_val;
    }
 
    public function getLanguage(): string
    {
        if ($this->language == "") {
            return "-";
        }
 
        return $this->language;
    }
 
    public function setEnablePCType(
        string $a_pc_type,
        bool $a_val
    ): void {
        $this->getPageConfig()->setEnablePCType($a_pc_type, $a_val);
    }
 
    public function getEnablePCType(string $a_pc_type): bool
    {
        return $this->getPageConfig()->getEnablePCType($a_pc_type);
    }
 
    public function setPageConfig(ilPageConfig $a_val): void
    {
        $this->page_config = $a_val;
    }
 
    public function getPageConfig(): ilPageConfig
    {
        return $this->page_config;
    }
 
    public function setPageObject(ilPageObject $a_pg_obj): void
    {
        $this->obj = $a_pg_obj;
    }
 
    public function getPageObject(): ilPageObject
    {
        return $this->obj;
    }
 
    public function setOutputMode(
        string $a_mode = self::PRESENTATION
    ): void {
        $this->output_mode = $a_mode;
    }
 
    public function getOutputMode(): string
    {
        return $this->output_mode;
    }
 
    public function setTemplateOutput(bool $a_output = true): void
    {
        $this->output2template = $a_output;
    }
 
    public function outputToTemplate(): bool
    {
        return $this->output2template;
    }
 
    public function setPresentationTitle(string $a_title = ""): void
    {
        $this->presentation_title = $a_title;
    }
 
    public function getPresentationTitle(): string
    {
        return $this->presentation_title;
    }
 
    public function setHeader(string $a_title = ""): void
    {
        $this->header = $a_title;
    }
 
    public function getHeader(): string
    {
        return $this->header;
    }
 
    public function setLinkParams(string $l_params = ""): void
    {
        $this->link_params = $l_params;
    }
 
    public function getLinkParams(): string
    {
        return $this->link_params;
    }
 
    public function setLinkFrame(string $l_frame = ""): void
    {
        $this->link_frame = $l_frame;
    }
 
    public function getLinkFrame(): string
    {
        return $this->link_frame;
    }
 
    public function setPageLinker(\ILIAS\COPage\PageLinker $page_linker): void
    {
        $this->page_linker = $page_linker;
    }
 
    public function getLinkXML(): string
    {
        return $this->link_xml;
    }
 
    public function setQuestionHTML(array $question_html): void
    {
        $this->getPageConfig()->setQuestionHTML($question_html);
    }
 
    public function getQuestionHTML(): array
    {
        return $this->getPageConfig()->getQuestionHTML();
    }
 
    public function setTemplateTargetVar(string $a_variable): void
    {
        $this->target_var = $a_variable;
    }
 
    public function getTemplateTargetVar(): string
    {
        return $this->target_var;
    }
 
    public function getTemplateOutputVar(): string
    {
        return $this->template_output_var;
    }
 
    public function setSourcecodeDownloadScript(string $script_name): void
    {
        $this->sourcecode_download_script = $script_name;
    }
 
    public function getSourcecodeDownloadScript(): string
    {
        return $this->sourcecode_download_script;
    }
 
    public function setTabs(ilTabsGUI $a_tabs): void
    {
        $this->tabs_gui = $a_tabs;
    }
 
    public function setPageBackTitle(string $a_title): void
    {
        $this->page_back_title = $a_title;
    }
 
    public function setFileDownloadLink(string $a_download_link): void
    {
        $this->file_download_link = $a_download_link;
    }
 
    public function getFileDownloadLink(): string
    {
        return $this->file_download_link;
    }
 
    public function setFullscreenLink(string $a_fullscreen_link): void
    {
        $this->fullscreen_link = $a_fullscreen_link;
    }
 
    public function getFullscreenLink(): string
    {
        return $this->fullscreen_link;
    }
 
    public function setIntLinkReturn(string $a_return): void
    {
        $this->int_link_return = $a_return;
    }
 
    public function enableNotes(bool $a_enabled, int $a_parent_id): void
    {
        $this->notes_enabled = $a_enabled;
        $this->notes_parent_id = $a_parent_id;
    }
 
    public function isEnabledNotes(): bool
    {
        return $this->notes_enabled;
    }
 
    public function setOfflineDirectory(string $offdir): void
    {
        $this->offline_directory = $offdir;
    }
 
    public function getOfflineDirectory(): string
    {
        return $this->offline_directory;
    }
 
 
    public function setViewPageLink(string $a_link, string $a_target = ""): void
    {
        $this->view_page_link = $a_link;
        $this->view_page_target = $a_target;
    }
 
    public function getViewPageLink(): string
    {
        return $this->view_page_link;
    }
 
    public function getViewPageTarget(): string
    {
        return $this->view_page_target;
    }
 
    public function getViewPageText(): string
    {
        return $this->lng->txt("cont_presentation_view");
    }
 
    public function setActivationListener(
        object $a_obj,
        string $a_meth
    ): void {
        $this->act_obj = $a_obj;
        $this->act_meth = $a_meth;
    }
 
    public function setEnabledNews(
        bool $a_enabled,
        int $a_news_obj_id = 0,
        string $a_news_obj_type = ""
    ): void {
        $this->enabled_news = $a_enabled;
        $this->news_obj_id = $a_news_obj_id;
        $this->news_obj_type = $a_news_obj_type;
    }
 
    public function getEnabledNews(): bool
    {
        return $this->enabled_news;
    }
 
    public function setTabHook(
        object $a_object,
        string $a_function
    ): void {
        $this->tab_hook = array("obj" => $a_object, "func" => $a_function);
    }
 
    public function setEditPreview(
        bool $a_editpreview
    ): void {
        $this->editpreview = $a_editpreview;
    }
 
    public function getEditPreview(): bool
    {
        return $this->editpreview;
    }
 
    public function setEnabledTabs(bool $a_enabledtabs): void
    {
        $this->tabs_enabled = $a_enabledtabs;
    }
 
    public function getEnabledTabs(): bool
    {
        return $this->tabs_enabled;
    }
 
    public function setEnabledPageFocus(bool $a_enabledpagefocus): void
    {
        $this->enabledpagefocus = $a_enabledpagefocus;
    }
 
    public function setOpenPlaceHolder(string $a_val): void
    {
        $this->open_place_holder = $a_val;
    }
 
    public function getOpenPlaceHolder(): string
    {
        return $this->open_place_holder;
    }
 
    public function getEnabledPageFocus(): bool
    {
        return $this->enabledpagefocus;
    }
 
    public function setPrependingHtml(string $a_prependinghtml): void
    {
        $this->prependinghtml = $a_prependinghtml;
    }
 
    public function getPrependingHtml(): string
    {
        return $this->prependinghtml;
    }
 
    public function setEnableEditing(bool $a_enableediting): void
    {
        $this->enableediting = $a_enableediting;
    }
 
    public function getEnableEditing(): bool
    {
        return $this->enableediting;
    }
 
    public function setRawPageContent(bool $a_rawpagecontent): void
    {
        $this->rawpagecontent = $a_rawpagecontent;
    }
 
    public function getRawPageContent(): bool
    {
        return $this->rawpagecontent;
    }
 
    public function setStyleId(int $a_styleid): void
    {
        $this->styleid = $a_styleid;
    }
 
    public function getStyleId(): int
    {
        return $this->styleid;
    }
 
    public function setCompareMode(bool $a_val): void
    {
        $this->compare_mode = $a_val;
    }
 
    public function getCompareMode(): bool
    {
        return $this->compare_mode;
    }
 
    public function setAbstractOnly(
        bool $a_val,
        string $pcid = ""
    ): void {
        $this->abstract_only = $a_val;
        $this->abstract_pcid = $pcid;
    }
 
    public function getAbstractOnly(): bool
    {
        return $this->abstract_only;
    }
 
    public function setRenderPageContainer(bool $a_val): void
    {
        $this->render_page_container = $a_val;
    }
 
    public function getRenderPageContainer(): bool
    {
        return $this->render_page_container;
    }
 
    public function getDisabledText(): string
    {
        return $this->lng->txt("inactive");
    }
 
    public function getEnabledHref(): bool
    {
        return $this->enabled_href;
    }
 
    public function setEnabledHref(bool $enable): void
    {
        $this->enabled_href = $enable;
    }
 
    public function activateMetaDataEditor(
        ilObject $a_rep_obj,
        string $a_type,
        int $a_sub_obj_id,
        ?object $a_observer_obj = null,
        string $a_observer_func = ""
    ): void {
        $this->use_meta_data = true;
        $this->meta_data_rep_obj = $a_rep_obj;
        $this->meta_data_sub_obj_id = $a_sub_obj_id;
        $this->meta_data_type = $a_type;
        $this->meta_data_observer_obj = $a_observer_obj;
        $this->meta_data_observer_func = $a_observer_func;
    }
 
    public function determineFileDownloadLink(): string
    {
        $file_download_link = $this->getFileDownloadLink();
        if ($this->getFileDownloadLink() == "" && $this->getOutputMode() != "offline") {
            $file_download_link = $this->ctrl->getLinkTarget($this, "downloadFile");
        }
        return $file_download_link;
    }
 
    public function determineFullscreenLink(): string
    {
        $fullscreen_link = $this->getFullscreenLink();
        if ($this->getFullscreenLink() == "" && $this->getOutputMode() != "offline") {
            $fullscreen_link = $this->ctrl->getLinkTarget($this, "displayMediaFullscreen", "", false, false);
        }
        return $fullscreen_link;
    }
 
    public function determineSourcecodeDownloadScript(): string
    {
        $l = $this->sourcecode_download_script;
        if ($this->sourcecode_download_script == "" && $this->getOutputMode() != "offline") {
            $l = $this->ctrl->getLinkTarget($this, "");
        }
        return $l;
    }
 
    public function getComponentPluginsXML(): string
    {
        $xml = "";
        if ($this->getOutputMode() == "edit") {
            foreach ($this->component_factory->getActivePluginsInSlot("pgcp") as $plugin) {
                if ($plugin->isValidParentType($this->getPageObject()->getParentType())) {
                    $xml .= '<ComponentPlugin Name="' . $plugin->getPluginName() .
                        '" InsertText="' . $plugin->txt(ilPageComponentPlugin::TXT_CMD_INSERT) . '" />';
                }
            }
        }
        if ($xml != "") {
            $xml = "<ComponentPlugins>" . $xml . "</ComponentPlugins>";
        }
        return $xml;
    }
 
 
    public function executeCommand(): string
    {
        $ret = "";
        $next_class = $this->ctrl->getNextClass($this);
        if ($next_class !== "") {
            $this->ctrl->setReturn($this, "edit");
        }
        $this->log->debug("next_class: " . $next_class);
        if ($next_class == "" && $this->ctrl->getCmd() == "edit") {
            $this->tabs_gui->clearTargets();
        } else {
            $this->getTabs();
        }
 
 
        switch ($next_class) {
            case 'ilobjectmetadatagui':
                $this->setBackToEditTabs();
                $md_gui = new ilObjectMetaDataGUI($this->meta_data_rep_obj, $this->meta_data_type, $this->meta_data_sub_obj_id);
                if (is_object($this->meta_data_observer_obj)) {
                    $md_gui->addMDObserver(
                        $this->meta_data_observer_obj,
                        $this->meta_data_observer_func,
                        "General"
                    );
                }
                // set adv metadata record dobject
                if ($this->adv_type != "") {
                    $md_gui->setAdvMdRecordObject($this->adv_ref_id, $this->adv_type, $this->adv_subtype);
                }
                $this->ctrl->forwardCommand($md_gui);
                break;
 
            case "ileditclipboardgui":
                $this->setBackToEditTabs();
                $clip_gui = new ilEditClipboardGUI();
                $clip_gui->setPageBackTitle($this->page_back_title);
                $ret = $this->ctrl->forwardCommand($clip_gui);
                break;
 
                // notes
            case "ilnotegui":
            case "ilcommentgui":
                $html = $this->edit();
                $this->tabs_gui->setTabActive("edit");
                return $html;
 
            case strtolower(PublicProfileGUI::class):
                $profile_gui = new PublicProfileGUI($this->requested_user_id);
                $ret = $this->ctrl->forwardCommand($profile_gui);
                break;
 
            case "ilpageeditorgui":
                $this->setEditorToolContext();
 
                if (!$this->getEnableEditing()) {
                    $this->tpl->setOnScreenMessage('failure', $this->lng->txt("permission_denied"), true);
                    $this->ctrl->redirect($this, "preview");
                }
                $page_editor = new ilPageEditorGUI($this->getPageObject(), $this);
                $page_editor->setHeader($this->getHeader());
                $page_editor->setPageBackTitle($this->page_back_title);
                $page_editor->setIntLinkReturn($this->int_link_return);
                //$page_editor->executeCommand();
                $ret = $this->ctrl->forwardCommand($page_editor);
                break;
 
            case 'ilnewsitemgui':
                $news_item_gui = new ilNewsItemGUI();
                $news_item_gui->setEnableEdit(true);
                $news_item_gui->setContextObjId($this->news_obj_id);
                $news_item_gui->setContextObjType($this->news_obj_type);
                $news_item_gui->setContextSubObjId($this->obj->getId());
                $news_item_gui->setContextSubObjType("pg");
 
                $ret = $this->ctrl->forwardCommand($news_item_gui);
                break;
 
            case "ilpropertyformgui":
                $form = $this->initOpenedContentForm();
                $this->ctrl->forwardCommand($form);
                break;
 
            case "ilinternallinkgui":
                $this->lng->loadLanguageModule("content");
                $link_gui = new ilInternalLinkGUI("Media_Media", 0);
 
                $link_gui->filterLinkType("PageObject_FAQ");
                $link_gui->filterLinkType("GlossaryItem");
                $link_gui->filterLinkType("Media_Media");
                $link_gui->filterLinkType("Media_FAQ");
 
                $link_gui->setFilterWhiteList(true);
                $this->ctrl->forwardCommand($link_gui);
                break;
 
            case "ilquestioneditgui":
                $this->setQEditTabs("question");
                $edit_gui = new ilQuestionEditGUI();
                $edit_gui->setPageConfig($this->getPageConfig());
                $edit_gui->setSelfAssessmentEditingMode(true);
                $ret = $this->ctrl->forwardCommand($edit_gui);
                $this->tpl->setContent($ret);
                break;
 
            case 'ilassquestionfeedbackeditinggui':
 
                $this->onFeedbackEditingForwarding();
 
                // set tabs
                $this->setQEditTabs("feedback");
 
                // load required lang mods
                $this->lng->loadLanguageModule("assessment");
 
                // set context tabs
                $questionGUI = assQuestionGUI::_getQuestionGUI(
                    $this->questioninfo->getGeneralQuestionProperties(
                        $this->requested_q_id
                    )->getClassName(),
                    $this->requested_q_id
                );
                $questionGUI->getObject()->setObjId(0);
                $questionGUI->getObject()->setSelfAssessmentEditingMode(true);
                $questionGUI->getObject()->setPreventRteUsage($this->getPageConfig()->getPreventRteUsage());
 
                // forward to ilAssQuestionFeedbackGUI
                (new ilQuestionEditGUI())->forwardToFeedbackEditGUI($questionGUI);
                break;
 
 
            case 'ilLearninghistorygui':
                $user_id = null;
                if ($this->getPageObject()->getParentType() == "prtf") {
                    $user_id = ilObject::_lookupOwner($this->getPageObject()->getPortfolioId());
                }
                $hist_gui = new ilLearningHistoryGUI();
                $hist_gui->setUserId($user_id);
                $this->ctrl->forwardCommand($hist_gui);
                break;
 
            default:
                $cmd = $this->ctrl->getCmd("preview");
                // presentation view
                if ($this->getViewPageLink() != "" && $cmd != "edit") {
                    $this->tabs_gui->addNonTabbedLink(
                        "pres_view",
                        $this->getViewPageText(),
                        $this->getViewPageLink()
                    );
                }
                $ret = $this->$cmd();
                if ($this->getOutputMode() == self::PREVIEW && $cmd == "preview") {
                    $this->showEditToolbar();
                }
                break;
        }
        //echo "+$ret+";
        return (string) $ret;
    }
 
    public function setQEditTabs(string $a_active): void
    {
        $this->tabs_gui->clearTargets();
 
        $this->tabs_gui->setBackTarget(
            $this->lng->txt("back"),
            $this->ctrl->getLinkTarget($this, "edit")
        );
 
        $this->ctrl->setParameterByClass("ilquestioneditgui", "q_id", $this->requested_q_id);
        $this->tabs_gui->addTab(
            "question",
            $this->lng->txt("question"),
            $this->ctrl->getLinkTargetByClass("ilquestioneditgui", "editQuestion")
        );
 
        $this->ctrl->setParameterByClass("ilAssQuestionFeedbackEditingGUI", "q_id", $this->requested_q_id);
        $this->tabs_gui->addTab(
            "feedback",
            $this->lng->txt("feedback"),
            $this->ctrl->getLinkTargetByClass("ilAssQuestionFeedbackEditingGUI", ilAssQuestionFeedbackEditingGUI::CMD_SHOW)
        );
 
        $this->tabs_gui->activateTab($a_active);
    }
 
    public function onFeedbackEditingForwarding(): void
    {
    }
 
    public function deactivatePage(): void
    {
        $this->getPageObject()->setActivationStart(null);
        $this->getPageObject()->setActivationEnd(null);
        $this->getPageObject()->setActive(false);
        $this->getPageObject()->update();
        $this->ctrl->redirect($this, "edit");
    }
 
    public function activatePage(): void
    {
        $this->getPageObject()->setActivationStart(null);
        $this->getPageObject()->setActivationEnd(null);
        $this->getPageObject()->setActive(true);
        $this->getPageObject()->update();
        $this->ctrl->redirect($this, "edit");
    }
 
    protected function showEditToolbar(): void
    {
        $ui = $this->ui;
        $lng = $this->lng;
        if ($this->getEnableEditing()) {
            $b = $ui->factory()->button()->standard(
                $lng->txt("edit_page"),
                $this->ctrl->getLinkTarget($this, "edit")
            );
            $this->toolbar->addComponent($b);
        }
    }
 
    public function showPage(): string
    {
        $main_tpl = $this->tpl;
        $sn_arr = [];
 
        $sel_js_mode = '';
        $paragraph_plugin_string = '';
        $disable_auto_margins = '';
 
        // jquery and jquery ui are always provided for components
        iljQueryUtil::initjQuery();
 
        //              $this->initSelfAssessmentRendering();
        ilObjMediaObjectGUI::includePresentationJS($main_tpl);
 
        $debug = false;
        if ($debug) {
            $main_tpl->addJavaScript("../components/ILIAS/COPage/js/ilCOPagePres.js");
        } else {
            $main_tpl->addJavaScript("components/ILIAS/COPage/js/ilCOPagePres.js");
        }
 
 
        // init template
        if ($this->getOutputMode() == "edit") {
            $this->initEditing();
            if (!$this->getPageObject()->getEditLock()) {
                return "";
            }
 
            $this->getPageObject()->buildDom();
 
            $this->log->debug("ilPageObjectGUI, showPage() in edit mode.");
 
            $tpl = new ilTemplate("tpl.page_edit_wysiwyg.html", true, true, "components/ILIAS/COPage");
            // to do: status dependent class
            $tpl->setVariable("CLASS_PAGE_TD", "ilc_Page");
 
            if ($this->getPageConfig()->getUsePageContainer()) {
                $tpl->setVariable("PAGE_CONTAINER_CLASS", "ilc_page_cont_PageContainer");
            }
 
            $tpl->setVariable(
                "WYSIWYG_ACTION",
                $this->ctrl->getFormActionByClass("ilpageeditorgui", "", "", true)
            );
 
            // determine media, html and javascript mode
            $sel_js_mode = "enable";
 
            // show prepending html
            $tpl->setVariable("PREPENDING_HTML", $this->getPrependingHtml());
 
 
            // get js files for JS enabled editing
            if ($sel_js_mode == "enable") {
                // add int link parts
                $tpl->setCurrentBlock("int_link_prep");
                $tpl->setVariable("INT_LINK_PREP", ilInternalLinkGUI::getInitHTML(
                    $this->ctrl->getLinkTargetByClass(
                        array("ilpageeditorgui", "ilinternallinkgui"),
                        "",
                        false,
                        true,
                        false
                    )
                ));
                $tpl->parseCurrentBlock();
 
                $this->editor_gui->init()->initUI($main_tpl);
            }
        } else {
            // presentation or preview here
 
            $tpl = new ilTemplate("tpl.page.html", true, true, "components/ILIAS/COPage");
            if ($this->getEnabledPageFocus()) {
                $tpl->touchBlock("page_focus");
            }
            // presentation
            if ($this->isPageContainerToBeRendered()) {
                $tpl->touchBlock("page_container_1");
                $tpl->touchBlock("page_container_2");
                $tpl->touchBlock("page_container_3");
            }
 
            // history
            $c_old_nr = $this->getPageObject()->old_nr;
            if ($c_old_nr > 0 || $this->getCompareMode() || ($this->requested_history_mode == 1)) {
                $hist_info =
                        $this->getPageObject()->getHistoryInfo($c_old_nr);
 
                if (!$this->getCompareMode()) {
                    $this->ctrl->setParameter($this, "history_mode", "1");
 
                    // previous revision
                    if (isset($hist_info["previous"])) {
                        $tpl->setCurrentBlock("previous_rev");
                        $tpl->setVariable("TXT_PREV_REV", $this->lng->txt("cont_previous_rev"));
                        $this->ctrl->setParameter($this, "old_nr", $hist_info["previous"]["nr"]);
                        $tpl->setVariable(
                            "HREF_PREV",
                            $this->ctrl->getLinkTarget($this, "preview")
                        );
                    } else {
                        $tpl->setCurrentBlock("previous_rev_disabled");
                        $tpl->setVariable("TXT_PREV_REV", $this->lng->txt("cont_previous_rev"));
                    }
                    $tpl->parseCurrentBlock();
 
                    // next revision
                    if ($c_old_nr > 0) {
                        $tpl->setCurrentBlock("next_rev");
                        $tpl->setVariable("TXT_NEXT_REV", $this->lng->txt("cont_next_rev"));
                        $this->ctrl->setParameter($this, "old_nr", $hist_info["next"]["nr"] ?? 0);
                        $tpl->setVariable(
                            "HREF_NEXT",
                            $this->ctrl->getLinkTarget($this, "preview")
                        );
                        $tpl->parseCurrentBlock();
 
                        // latest revision
                        $tpl->setCurrentBlock("latest_rev");
                        $tpl->setVariable("TXT_LATEST_REV", $this->lng->txt("cont_latest_rev"));
                        $this->ctrl->setParameter($this, "old_nr", "");
                        $tpl->setVariable(
                            "HREF_LATEST",
                            $this->ctrl->getLinkTarget($this, "preview")
                        );
                        $tpl->parseCurrentBlock();
                    }
 
                    $this->ctrl->setParameter($this, "history_mode", "");
 
                    // rollback
                    if ($c_old_nr > 0 && $this->user->getId() != ANONYMOUS_USER_ID) {
                        $tpl->setCurrentBlock("rollback");
                        $this->ctrl->setParameter($this, "old_nr", $c_old_nr);
                        $tpl->setVariable(
                            "HREF_ROLLBACK",
                            $this->ctrl->getLinkTarget($this, "rollbackConfirmation")
                        );
                        $this->ctrl->setParameter($this, "old_nr", "");
                        $tpl->setVariable(
                            "TXT_ROLLBACK",
                            $this->lng->txt("cont_rollback")
                        );
                        $tpl->parseCurrentBlock();
                    }
                }
 
                $tpl->setCurrentBlock("hist_nav");
                $tpl->setVariable("TXT_REVISION", $this->lng->txt("cont_revision"));
                $tpl->setVariable(
                    "VAL_REVISION_DATE",
                    ilDatePresentation::formatDate(new ilDateTime($hist_info["current"]["hdate"], IL_CAL_DATETIME))
                );
                $tpl->setVariable(
                    "VAL_REV_USER",
                    ilUserUtil::getNamePresentation($hist_info["current"]["user_id"])
                );
                $tpl->parseCurrentBlock();
            }
        }
        if ($this->getOutputMode() != self::PRESENTATION &&
                $this->getOutputMode() != self::OFFLINE &&
                $this->getOutputMode() != self::PREVIEW &&
                $this->getOutputMode() != self::PRINTING) {
            $tpl->setVariable("FORMACTION", $this->ctrl->getFormActionByClass("ilpageeditorgui"));
        }
 
        // output media object edit list (of media links)
        if ($this->getOutputMode() == "edit") {
            $links = ilInternalLink::_getTargetsOfSource(
                $this->obj->getParentType() . ":pg",
                $this->obj->getId(),
                $this->obj->getLanguage()
            );
            $mob_links = array();
            foreach ($links as $link) {
                if ($link["type"] == "mob") {
                    if (ilObject::_exists($link["id"]) && ilObject::_lookupType($link["id"]) == "mob") {
                        $mob_links[$link["id"]] = ilObject::_lookupTitle($link["id"]) . " [" . $link["id"] . "]";
                    }
                }
            }
 
            // linked media objects
            if (count($mob_links) > 0) {
                $tpl->setCurrentBlock("med_link");
                $tpl->setVariable("TXT_LINKED_MOBS", $this->lng->txt("cont_linked_mobs"));
                $tpl->setVariable(
                    "SEL_MED_LINKS",
                    ilLegacyFormElementsUtil::formSelect(0, "mob_id", $mob_links, false, true)
                );
                $tpl->setVariable("TXT_EDIT_MEDIA", $this->lng->txt("cont_edit_mob"));
                $tpl->setVariable("TXT_COPY_TO_CLIPBOARD", $this->lng->txt("cont_copy_to_clipboard"));
                //$this->tpl->setVariable("TXT_COPY_TO_POOL", $this->lng->txt("cont_copy_to_mediapool"));
                $tpl->parseCurrentBlock();
            }
 
            // content snippets used
            $this->getPageObject()->buildDom();
            $snippets = ilPCContentInclude::collectContentIncludes(
                $this->getPageObject(),
                $this->getPageObject()->getDomDoc()
            );
            if (count($snippets) > 0) {
                foreach ($snippets as $s) {
                    $sn_arr[$s["id"]] = ilMediaPoolPage::lookupTitle($s["id"]);
                }
                $tpl->setCurrentBlock("med_link");
                $tpl->setVariable("TXT_CONTENT_SNIPPETS_USED", $this->lng->txt("cont_snippets_used"));
                $tpl->setVariable(
                    "SEL_SNIPPETS",
                    ilLegacyFormElementsUtil::formSelect(0, "ci_id", $sn_arr, false, true)
                );
                $tpl->setVariable("TXT_SHOW_INFO", $this->lng->txt("cont_show_info"));
                $tpl->parseCurrentBlock();
            }
 
            // scheduled activation?
            if (!$this->getPageObject()->getActive() &&
                    $this->getPageObject()->getActivationStart() != "" &&
                    $this->getPageConfig()->getEnableScheduledActivation()) {
                $tpl->setCurrentBlock("activation_txt");
                $tpl->setVariable("TXT_SCHEDULED_ACTIVATION", $this->lng->txt("cont_scheduled_activation"));
                $tpl->setVariable(
                    "SA_FROM",
                    ilDatePresentation::formatDate(
                        new ilDateTime(
                            $this->getPageObject()->getActivationStart(),
                            IL_CAL_DATETIME
                        )
                    )
                );
                $tpl->setVariable(
                    "SA_TO",
                    ilDatePresentation::formatDate(
                        new ilDateTime(
                            $this->getPageObject()->getActivationEnd(),
                            IL_CAL_DATETIME
                        )
                    )
                );
                $tpl->parseCurrentBlock();
            }
        }
 
        // get content
        $builded = $this->obj->buildDom();
 
        // manage hierarchical ids
        if ($this->getOutputMode() == "edit") {
            // add pc ids, if necessary
            if (!$this->obj->checkPCIds()) {
                $this->obj->insertPCIds();
                $this->obj->update(true, true);
            }
 
            $this->obj->addFileSizes();
            $this->obj->addHierIDs();
        } else {
            $this->obj->addFileSizes();
        }
 
        //echo "<br>-".htmlentities($this->obj->getXMLContent())."-<br><br>"; exit;
        //echo "<br>-".htmlentities($this->getLinkXML())."-"; exit;
 
        // set default link xml, if nothing was set yet
        if (!$this->link_xml_set) {
            $this->setDefaultLinkXml();
        }
 
        $template_xml = '';
 
        $link_xml = $this->getLinkXML();
 
        // disable/enable auto margins
        if ($this->getStyleId() > 0) {
            if (ilObject::_lookupType($this->getStyleId()) == "sty") {
                $style = new ilObjStyleSheet($this->getStyleId());
                $template_xml = $style->getTemplateXML();
                $disable_auto_margins = "n";
                if ($style->lookupStyleSetting("disable_auto_margins")) {
                    $disable_auto_margins = "y";
                }
            }
        }
 
        $append_footnotes = "y";
        if ($this->getAbstractOnly()) {
            if (!$this->abstract_pcid) {
                $content = "<dummy><PageObject><PageContent><Paragraph>" .
                    $this->obj->getFirstParagraphText() . $link_xml .
                    "</Paragraph></PageContent></PageObject></dummy>";
            } else {
                $append_footnotes = "n";
                $par = $this->obj->getParagraphForPCID($this->abstract_pcid);
                $content = "<dummy><PageObject><PageContent><Paragraph Characteristic='" . $par->getCharacteristic() . "'>" .
                    $par->getText() . $link_xml .
                    "</Paragraph></PageContent></PageObject>" . $this->obj->getMultimediaXML() . "</dummy>";
            }
        } else {
            $content = $this->obj->getXMLFromDom(
                false,
                true,
                true,
                $link_xml . $template_xml . $this->getComponentPluginsXML(),
                false,
                $this->getStyleId(),
                $this->getOutputMode() === "offline"
            );
        }
 
        // check validation errors
        if ($builded !== true) {
            $this->displayValidationError($builded);
        } else {
            $this->displayValidationError((string) $this->edit_repo->getPageError());
        }
        $this->edit_repo->clearPageError();
 
        // get title
        $pg_title = $this->getPresentationTitle();
        $col_path = '';
        $row_path = '';
        $cell_path = '';
        $item_path = '';
        if ($this->getOutputMode() == "edit") {
            $col_path = ilUtil::getImagePath("object/col.svg");
            $row_path = ilUtil::getImagePath("object/row.svg");
            $item_path = ilUtil::getImagePath("page_editor/icon_peadl.svg");
            $cell_path = ilUtil::getImagePath("object/cell.svg");
        }
 
        if ($this->getOutputMode() != "offline") {
            $enlarge_path = ilUtil::getImagePath("media/enlarge.svg");
            $wb_path = ilFileUtils::getWebspaceDir("output") . "/";
        } else {
            $enlarge_path = "images/media/enlarge.svg";
            $wb_path = "";
        }
        $pg_title_class = ($this->getOutputMode() == "print")
            ? "ilc_PrintPageTitle"
            : "";
 
        // page splitting only for learning modules and
        // digital books
        $enable_split_new = ($this->obj->getParentType() == "lm")
            ? "y"
            : "n";
 
        // page splitting to next page only for learning modules and
        // digital books if next page exists in tree
        if (($this->obj->getParentType() == "lm") &&
            ilObjContentObject::hasSuccessorPage(
                $this->obj->getParentId(),
                $this->obj->getId()
            )) {
            $enable_split_next = "y";
        } else {
            $enable_split_next = "n";
        }
 
        $img_path = ilUtil::getImagePath("", false, $this->getOutputMode(), $this->getOutputMode() == "offline");
 
 
        if ($this->getPageConfig()->getEnablePCType("Tabs")) {
            ilAccordionGUI::addJavaScript();
            ilAccordionGUI::addCss();
        }
 
        // needed for placeholders
        $this->tpl->addCss(ilObjStyleSheet::getBaseContentStylePath());
 
        $file_download_link = $this->determineFileDownloadLink();
        $fullscreen_link = $this->determineFullscreenLink();
        $this->sourcecode_download_script = $this->determineSourcecodeDownloadScript();
 
        // default values for various parameters (should be used by
        // all instances in the future)
        $media_mode = ($this->getOutputMode() == "edit")
            ? $this->user->getPref("ilPageEditor_MediaMode")
            : "enable";
 
        $paste = (ilEditClipboard::getAction() == "copy" &&
            $this->getOutputMode() == "edit");
 
        $cfg = $this->getPageConfig();
 
        $current_ts = time();
 
        $enable_href = $this->getEnabledHref();
        if ($this->getOutputMode() == self::EDIT) {
            $enable_href = false;
        }
 
        // added UTF-8 encoding otherwise umlaute are converted too
        $params = array('mode' => $this->getOutputMode(), 'pg_title' => htmlentities($pg_title, ENT_QUOTES, "UTF-8"),
                         'enable_placeholder' => $cfg->getEnablePCType("PlaceHolder") ? "y" : "n",
                         'pg_id' => $this->obj->getId(), 'pg_title_class' => $pg_title_class,
                         'webspace_path' => $wb_path, 'enlarge_path' => $enlarge_path,
                         'img_col' => $col_path,
                         'img_row' => $row_path,
                         'img_cell' => $cell_path,
                         'img_item' => $item_path,
                         'acc_save_url' => "./ilias.php?baseClass=ilaccordionpropertiesstoragegui&cmd=setOpenedTab" .
                             "&user_id=" . $this->user->getId(),
                         'append_footnotes' => $append_footnotes,
                         'compare_mode' => $this->getCompareMode() ? "y" : "n",
                         'enable_split_new' => $enable_split_new,
                         'enable_split_next' => $enable_split_next,
                         'link_params' => $this->link_params,
                         'file_download_link' => $file_download_link,
                         'fullscreen_link' => $fullscreen_link,
                         'img_path' => $img_path,
                         'parent_id' => $this->obj->getParentId(),
                         'download_script' => $this->sourcecode_download_script,
                         'encoded_download_script' => urlencode($this->sourcecode_download_script),
                         'enable_rep_objects' => $cfg->getEnablePCType("Resources") ? "y" : "n",
                         'enable_login_page' => $cfg->getEnablePCType("LoginPageElement") ? "y" : "n",
                         'enable_map' => ($cfg->getEnablePCType("Map") && ilMapUtil::isActivated()) ? "y" : "n",
                         'enable_tabs' => $cfg->getEnablePCType("Tabs") ? "y" : "n",
                         'enable_sa_qst' => $cfg->getEnableSelfAssessment() ? "y" : "n",
                         'enable_file_list' => $cfg->getEnablePCType("FileList") ? "y" : "n",
                         'enable_content_includes' => $cfg->getEnablePCType("ContentInclude") ? "y" : "n",
                         'enable_content_templates' => (count($this->getPageObject()->getContentTemplates()) > 0) ? "y" : "n",
                         'paste' => $paste ? "y" : "n",
                         'media_mode' => $media_mode,
                         'javascript' => $sel_js_mode,
                         'paragraph_plugins' => $paragraph_plugin_string,
                         'disable_auto_margins' => $disable_auto_margins,
                         'page_toc' => $cfg->getEnablePageToc() ? "y" : "n",
                         'enable_profile' => $cfg->getEnablePCType("Profile") ? "y" : "n",
                         'enable_verification' => $cfg->getEnablePCType("Verification") ? "y" : "n",
                         'enable_blog' => $cfg->getEnablePCType("Blog") ? "y" : "n",
                         'enable_skills' => $cfg->getEnablePCType("Skills") ? "y" : "n",
                         'enable_learning_history' => $cfg->getEnablePCType("LearningHistory") ? "y" : "n",
                         'enable_qover' => "n",
                         'enable_consultation_hours' => $cfg->getEnablePCType("ConsultationHours") ? "y" : "n",
                         'enable_my_courses' => $cfg->getEnablePCType("MyCourses") ? "y" : "n",
                         'enable_amd_page_list' => $cfg->getEnablePCType("AMDPageList") ? "y" : "n",
                         'current_ts' => $current_ts,
                         'enable_html_mob' => ilObjMediaObject::isTypeAllowed("html") ? "y" : "n",
                         'page_perma_link' => $this->getPagePermaLink(),
                         'activated_protection' =>
                            ($this->getPageConfig()->getSectionProtection() == \ilPageConfig::SEC_PROTECT_PROTECTED) ? "y" : "n",
                        'protection_text' => $this->lng->txt("cont_sec_protected_text"),
                        'enable_href' => $enable_href
    );
        if ($this->link_frame != "") {          // todo other link types
            $params["pg_frame"] = $this->link_frame;
        }
 
        //$content = str_replace("&nbsp;", "", $content);
 
        // this ensures that cache is emptied with every update
        $params["version"] = ILIAS_VERSION;
        // ensure no cache hit, if included files/media objects have been changed
        $params["incl_elements_date"] = $this->obj->getLastUpdateOfIncludedElements();
 
 
        // should be modularized
        $md5_adds = ilPCSection::getCacheTriggerString($this->getPageObject());
        // run xslt
        $md5 = md5(serialize($params) . $link_xml . $template_xml . $md5_adds);
 
        //$a = microtime();
 
        // check cache (same parameters, non-edit mode and rendered time
        // > last change
        $is_error = false;
        if (($this->getOutputMode() == "preview" || $this->getOutputMode() == "presentation") &&
            !$this->getCompareMode() &&
            !$this->getAbstractOnly() &&
            $md5 == $this->obj->getRenderMd5() &&
            ($this->obj->getLastChange() < $this->obj->getRenderedTime()) &&
            $this->obj->getRenderedTime() != "" &&
            $this->obj->old_nr == 0) {
            // cache hit
            $output = $this->obj->getRenderedContent();
        } else {
            $this->log->debug("Calling XSLT, content: " . substr($content, 0, 100));
            try {
                $output = $this->xsl->process($content, $params);
            } catch (Exception $e) {
                $output = "";
                if ($this->getOutputMode() == "edit") {
                    $output = "<pre>" . $e->getMessage() . "<br>" . htmlentities($content) . "</pre>";
                    $is_error = true;
                }
            }
            if (($this->getOutputMode() == "presentation" || $this->getOutputMode() == "preview")
                && !$this->getAbstractOnly()
                && $this->obj->old_nr == 0) {
                $this->obj->writeRenderedContent($output, $md5);
            }
        }
 
        if (!$is_error) {
            // unmask user html
            if (($this->getOutputMode() != "edit" ||
                    $this->user->getPref("ilPageEditor_HTMLMode") != "disable")
                && !$this->getPageConfig()->getPreventHTMLUnmasking()) {
                $output = str_replace("&lt;", "<", $output);
                $output = str_replace("&gt;", ">", $output);
            }
            $output = str_replace("&amp;", "&", $output);
 
            // insert page snippets
            //$output = $this->insertContentIncludes($output);
 
            // insert resource blocks
            $output = $this->insertResources($output);
 
            // insert page toc
            if ($this->getPageConfig()->getEnablePageToc()) {
                $output = $this->insertPageToc($output);
            }
 
            // insert advanced output trigger
            $output = $this->insertAdvTrigger($output);
 
            // workaround for preventing template engine
            // from hiding paragraph text that is enclosed
            // in curly brackets (e.g. "{a}", see ilLMEditorGUI::executeCommand())
            $output = $this->replaceCurlyBrackets($output);
 
            // remove all newlines (important for code / pre output)
            $output = str_replace("\n", "", $output);
 
            //echo htmlentities($output);
            $output = $this->postOutputProcessing($output);
            //echo htmlentities($output);
            if ($this->getOutputMode() == "edit" &&
                !$this->getPageObject()->getActive($this->getPageConfig()->getEnableScheduledActivation())) {
                $output = '<div class="copg-disabled-page"><div class="ilCopgDisabledText">' . $this->getDisabledText() . '</div>' . $output . '</div>';
            }
 
            // for all page components...
            $defs = $this->pc_definition->getPCDefinitions();
            foreach ($defs as $def) {
                $pc_class = $def["pc_class"];
                $pc_obj = new $pc_class($this->getPageObject());
                $pc_obj->setSourcecodeDownloadScript($this->determineSourcecodeDownloadScript());
                $pc_obj->setFileDownloadLink($this->determineFileDownloadLink());
                $pc_obj->setFullscreenLink($this->determineFullscreenLink());
                $pc_obj->setProfileBackUrl($this->getProfileBackUrl());
 
                // post xsl page content modification by pc elements
                $output = $pc_obj->modifyPageContentPostXsl($output, $this->getOutputMode(), $this->getAbstractOnly());
            }
        }
 
        $this->addResourcesToTemplate($main_tpl);
 
        // enable rendering of latex in the whole output
        $output = $this->ui->renderer()->render($this->ui->factory()->legacy()->latexContent($output));
 
        //              $output = $this->selfAssessmentRendering($output);
 
        // output
        if ($this->ctrl->isAsynch() && !$this->getRawPageContent() &&
            $this->getOutputMode() == "edit") {
            // e.g. ###3:110dad8bad6df8620071a0a693a2d328###
            $up_pc = $this->request->getString("updated_pc_id_str");
            if ($up_pc != "") {
                echo $up_pc;
            }
            $tpl->setVariable($this->getTemplateOutputVar(), $output);
            $tpl->setCurrentBlock("edit_page");
            $tpl->parseCurrentBlock();
            echo $tpl->get("edit_page");
            exit;
        }
        $edit_init = "";
        if ($this->getOutputMode() === "edit") {
            $edit_init = $this->editor_gui->init()->getInitHtml($this->getOpenPlaceHolder());
        }
        if ($this->outputToTemplate()) {
            $tpl->setVariable($this->getTemplateOutputVar(), $output);
            $this->tpl->setVariable($this->getTemplateTargetVar(), $tpl->get() . $edit_init);
            return $output;
        } else {
            if ($this->getRawPageContent()) {           // e.g. needed in glossaries
                return $output . $edit_init;
            } else {
                $tpl->setVariable($this->getTemplateOutputVar(), $output);
                return $tpl->get() . $edit_init;
            }
        }
    }
 
    public function replaceCurlyBrackets(string $output): string
    {
        //echo "<br><br>".htmlentities($output);
 
        while (is_int($start = strpos($output, "<!--ParStart-->")) &&
            is_int($end = strpos($output, "<!--ParEnd-->", $start))) {
            $output = substr($output, 0, $start) .
                str_replace(
                    array("{","}"),
                    array("&#123;","&#125;"),
                    substr($output, $start + 15, $end - ($start + 15))
                ) .
                substr($output, $end + 13);
        }
 
        //              $output = str_replace("{", "&#123;", $output);
        //              $output = str_replace("}", "&#125;", $output);
        //echo "<br><br>".htmlentities($output);
        return $output;
    }
 
    public function getActivationCaptions(): array
    {
        return array("deactivatePage" => $this->lng->txt("cont_deactivate_page"),
                "activatePage" => $this->lng->txt("cont_activate_page"));
    }
 
    public function setEditMode(): void
    {
        $media_mode = $this->request->getString("media_mode");
        $html_mode = $this->request->getString("html_mode");
        $js_mode = $this->request->getString("js_mode");
        if ($media_mode != "") {
            if ($media_mode == "disable") {
                $this->user->writePref("ilPageEditor_MediaMode", "disable");
            } else {
                $this->user->writePref("ilPageEditor_MediaMode", "");
            }
        }
        if ($html_mode != "") {
            if ($html_mode == "disable") {
                $this->user->writePref("ilPageEditor_HTMLMode", "disable");
            } else {
                $this->user->writePref("ilPageEditor_HTMLMode", "");
            }
        }
        if ($js_mode != "") {
            if ($js_mode == "disable") {
                $this->user->writePref("ilPageEditor_JavaScript", "disable");
            } else {
                $this->user->writePref("ilPageEditor_JavaScript", "");
            }
        }
 
        $this->ctrl->redirect($this, "edit");
    }
 
    public function setDefaultLinkXml(): void
    {
        $this->page_linker->setProfileBackUrl($this->getProfileBackUrl());
        $this->page_linker->setOffline($this->getOutputMode() == self::OFFLINE);
        $this->setLinkXml($this->page_linker->getLinkXML($this->getPageObject()->getInternalLinks()));
    }
 
    public function setLinkXml(string $xml): void
    {
        $this->link_xml = $xml;
        $this->link_xml_set = true;
    }
 
 
    public function getProfileBackUrl(): string
    {
        if ($this->profile_back_url != "") {
            return $this->profile_back_url;
        }
        if ($this->getOutputMode() === self::OFFLINE ||
            $this->getOutputMode() === self::PRINTING) {
            return "";
        }
        return $this->ctrl->getLinkTargetByClass(strtolower(get_class($this)), "preview");
    }
 
    public function setProfileBackUrl(string $url): void
    {
        $this->profile_back_url = $url;
    }
 
 
    public function downloadFile(): void
    {
        $this->getPageObject()->buildDom();
        $cm = $this->pm->content($this->getPageObject()->getDomDoc());
        $cm->downloadFile(
            $this->getPageObject(),
            $this->requested_file_id
        );
    }
 
    public function displayMediaFullscreen(): void
    {
        $this->displayMedia(true);
    }
 
    public function displayMedia(bool $a_fullscreen = false): void
    {
        $tpl = new ilGlobalTemplate("tpl.fullscreen.html", true, true, "components/ILIAS/LearningModule");
        $tpl->setCurrentBlock("ilMedia");
        //$int_links = $page_object->getInternalLinks();
        $med_links = ilMediaItem::_getMapAreasIntLinks($this->request->getMobId());
 
        // @todo
        $link_xml = $this->page_linker->getLinkXML($med_links);
 
        $media_obj = new ilObjMediaObject($this->request->getMobId());
        if ($this->request->getPageType() === "mep") {
            $pg_obj = new ilMediaPoolPage($this->request->getPageId());
        } else {
            $pg_obj = $this->getPageObject();
        }
        $pg_obj->buildDom();
 
        $xml = "<dummy>";
        if ($this->requested_pg_id > 0) {
            $xml .= $pg_obj->getMediaAliasElement($this->request->getMobId());
        } else {
            $xml .= $media_obj->getXML(IL_MODE_ALIAS);
        }
        $xml .= $media_obj->getXML(IL_MODE_OUTPUT);
        $xml .= $link_xml;
        $xml .= "</dummy>";
 
        $mode = "media";
        if ($a_fullscreen) {
            $mode = "fullscreen";
        }
 
        //echo "XML:".htmlentities($xml);
        // determine target frames for internal links
        $wb_path = ilFileUtils::getWebspaceDir("output") . "/";
        $enlarge_path = ilUtil::getImagePath("media/enlarge.svg");
        $params = array('mode' => $mode, 'enlarge_path' => $enlarge_path,
            'link_params' => "ref_id=" . $this->requested_ref_id,'fullscreen_link' => "",
                        'enable_html_mob' => ilObjMediaObject::isTypeAllowed("html") ? "y" : "n",
            'ref_id' => $this->requested_ref_id, 'webspace_path' => $wb_path);
        $output = $this->xsl->process($xml, $params);
 
        // unmask user html
        $tpl->addCss(ilUtil::getStyleSheetLocation());
        $tpl->addCss(ilObjStyleSheet::getContentStylePath(0));
        $tpl->setVariable("MEDIA_CONTENT", $output);
 
        // add js
        ilObjMediaObjectGUI::includePresentationJS($tpl);
        //$tpl->fillJavaScriptFiles();
        //$tpl->fillCssFiles();
        $this->gui->toolbar()->setItems([]);    // clear toolbar, see #45620
        $tpl->printToStdout();
        exit;
    }
 
    public function showPageFullscreen(): void
    {
        $tpl = new ilGlobalTemplate("tpl.fullscreen.html", true, true, "components/ILIAS/COPage");
        $this->setTemplate($tpl);
        $this->addResourcesToTemplate($tpl);
        $tpl->addCss(ilUtil::getStyleSheetLocation());
        $tpl->addCss(ilObjStyleSheet::getContentStylePath($this->getStyleId()));
        $this->setTemplateOutput(false);
        $this->setHeader("");
        $ret = $this->showPage();
        $tpl->setVariable("MEDIA_CONTENT", "<div>" . $ret . "</div>");
        $tpl->printToStdout();
        exit;
    }
 
 
    public function download_paragraph(): void
    {
        $pg_obj = $this->getPageObject();
        $pg_obj->buildDom();
        $pg_obj->sendParagraph(
            $this->request->getString("par_id"),
            $this->request->getString("downloadtitle")
        );
    }
 
    public function insertPageToc(string $a_output): string
    {
        // extract all headings
        $offsets = [];
        $cpos = 0;
        while (is_int($pos = strpos($a_output, "ilPageTocH", $cpos))) {
            $offsets[] = $pos;
            $cpos = $pos + 1;
        }
 
        $page_heads = array();
        foreach ($offsets as $os) {
            $level = (int) substr($a_output, $os + 10, 1);
            if (in_array($level, array(1,2,3))) {
                $anchor = str_replace(
                    "TocH",
                    "TocA",
                    substr($a_output, $os, strpos($a_output, "-->", $os) - $os)
                );
 
                // get heading
                $tag_start = stripos($a_output, "<h" . $level . " ", $os);
                $tag_end = stripos($a_output, "</h" . $level . ">", $tag_start);
                $head = substr($a_output, $tag_start, $tag_end - $tag_start);
 
                // get headings text
                $text_start = stripos($head, ">") + 1;
                $text_end = strripos($head, "<!--", $text_start);
                $text = substr($head, $text_start, $text_end - $text_start);
                $page_heads[] = array("level" => $level, "text" => $text,
                    "anchor" => $anchor);
            }
        }
        if (count($page_heads) > 1) {
            $listing = $this->gui->listing();
            // todo: inject?
            /*$list->setListClass("ilc_page_toc_PageTOCList");
            $list->setItemClass("ilc_page_toc_PageTOCItem");*/
            $i = 0;
            $c_depth = 1;
            $c_par[1] = 0;
            $c_par[2] = 0;
            $page_toc_ph = "<!--PageTocPH-->";
            foreach ($page_heads as $ind => $h) {
                $i++;
                $par = 0;
 
                // check if we have a parent for one level up
                $par = 0;
                if ($h["level"] == 2 && $c_par[1] > 0) {
                    $par = $c_par[1];
                }
                if ($h["level"] == 3 && $c_par[2] > 0) {
                    $par = $c_par[2];
                }
 
                $h["text"] = str_replace($page_toc_ph, "", $h["text"]);
 
                $listing->node(
                    $this->ui->factory()->legacy()->content("<a href='#" . $h["anchor"] . "' class='ilc_page_toc_PageTOCLink'>" . $h["text"] . "</a>"),
                    (string) $i,
                    (string) ($par)
                );
 
                // set the node as current parent of the level
                if ($h["level"] == 1) {
                    $c_par[1] = $i;
                    $c_par[2] = 0;
                }
                if ($h["level"] == 2) {
                    $c_par[2] = $i;
                }
            }
 
            $tpl = new ilTemplate(
                "tpl.page_toc.html",
                true,
                true,
                "components/ILIAS/COPage"
            );
            $tpl->setVariable("PAGE_TOC", $listing->autoNumbers(true)->render());
            $tpl->setVariable("TXT_PAGE_TOC", $this->lng->txt("cont_page_toc"));
            $tpl->setVariable("TXT_HIDE", $this->lng->txt("hide"));
            $tpl->setVariable("TXT_SHOW", $this->lng->txt("show"));
 
            $a_output = str_replace(
                "{{{{{PageTOC}}}}}",
                $tpl->get(),
                $a_output
            );
            $numbers = $listing->getNumbers();
 
            if (count($numbers) > 0) {
                foreach ($numbers as $n) {
                    $a_output = (strpos($a_output, $page_toc_ph) !== false)
                        ? substr_replace($a_output, $n . " ", strpos($a_output, $page_toc_ph), strlen($page_toc_ph))
                        : $a_output;
                }
            }
        } else {
            $a_output = str_replace(
                "{{{{{PageTOC}}}}}",
                "",
                $a_output
            );
        }
 
        return $a_output;
    }
 
    public function insertResources(string $a_output): string
    {
        // this is edit mode only
        if ($this->getEnablePCType("Resources") &&
            ($this->getOutputMode() == "edit" || $this->getOutputMode() == "preview")) {
            $a_output = ilPCResourcesGUI::insertResourcesIntoPageContent($a_output);
        }
        return $a_output;
    }
 
 
 
    public function insertAdvTrigger(string $a_output): string
    {
        if (!$this->getAbstractOnly()) {
            $a_output = str_replace(
                "{{{{{LV_show_adv}}}}}",
                $this->lng->txt("cont_show_adv"),
                $a_output
            );
            $a_output = str_replace(
                "{{{{{LV_hide_adv}}}}}",
                $this->lng->txt("cont_hide_adv"),
                $a_output
            );
        } else {
            $a_output = str_replace(
                "{{{{{LV_show_adv}}}}}",
                "",
                $a_output
            );
            $a_output = str_replace(
                "{{{{{LV_hide_adv}}}}}",
                "",
                $a_output
            );
        }
 
        return $a_output;
    }
 
 
    public function postOutputProcessing(string $a_output): string
    {
        return $a_output;
    }
 
 
    public function previewHistory(): void
    {
        $this->preview();
    }
 
    public function preview(): string
    {
        if ($this->requested_history_mode) {
            $this->setBackToHistoryTabs();
        } else {
            $this->tabs_gui->activateTab("cont_preview");
        }
        $this->setOutputMode(self::PREVIEW);
        return $this->showPage();
    }
 
    protected function setEditorToolContext(): void
    {
        $collection = $this->tool_context->current()->getAdditionalData();
        if ($collection->exists(ilCOPageEditGSToolProvider::SHOW_EDITOR)) {
            $collection->replace(ilCOPageEditGSToolProvider::SHOW_EDITOR, true);
        } else {
            $collection->add(ilCOPageEditGSToolProvider::SHOW_EDITOR, true);
        }
    }
 
    protected function initEditing(): void
    {
        // editing allowed?
        if (!$this->getEnableEditing()) {
            $this->tpl->setOnScreenMessage('failure', $this->lng->txt("permission_denied"), true);
            $this->ctrl->redirect($this, "preview");
        }
 
        // not so nive workaround for container pages, bug #0015831
        $ptype = $this->getParentType();
        if ($ptype == "cont" && $this->requested_ref_id > 0) {
            $ptype = ilObject::_lookupType($this->requested_ref_id, true);
        }
        $this->setScreenIdComponent();
        $this->help->setScreenId("edit_" . $ptype);
 
        // edit lock
        if (!$this->getPageObject()->getEditLock()) {
            $this->showEditLockInfo();
            return;
        } else {
            $this->setEditorToolContext();
        }
 
        $this->lng->toJS("paste");
        $this->lng->toJS("delete");
        $this->lng->toJS("cont_delete_content");
        $this->lng->toJS("copg_confirm_el_deletion");
        $this->lng->toJS("cont_saving");
        $this->lng->toJS("cont_ed_par");
        $this->lng->toJS("cont_no_block");
        $this->lng->toJS("copg_error");
        $this->lng->toJS("cont_ed_click_to_add_pg");
        $this->lng->toJS("cont_ed_new_item_after");
        $this->lng->toJS("cont_ed_new_item_before");
        $this->lng->toJS("cont_ed_item_up");
        $this->lng->toJS("cont_ed_item_down");
        $this->lng->toJS("cont_ed_delete_item");
        $this->lng->toJS("copg_edit_iframe_title");
        $this->lng->toJS("copg_par_format_selection");
        \ilCalendarUtil::initDateTimePicker();
        // ilModalGUI::initJS();        // due to permission repo picker in sections, waits for new tree/repo picker
    }
 
    protected function showEditLockInfo(): void
    {
        $info = $this->lng->txt("content_no_edit_lock");
        $lock = $this->getPageObject()->getEditLockInfo();
        $info .= "</br>" . $this->lng->txt("content_until") . ": " .
            ilDatePresentation::formatDate(new ilDateTime($lock["edit_lock_until"], IL_CAL_UNIX));
        $info .= "</br>" . $this->lng->txt("obj_usr") . ": " .
            ilUserUtil::getNamePresentation($lock["edit_lock_user"]);
 
        $back_link = $this->ui->factory()->link()->standard(
            $this->lng->txt("back"),
            $this->ctrl->getLinkTarget($this, "finishEditing")
        );
 
        $mbox = $this->ui->factory()->messageBox()->info($info)
            ->withLinks([$back_link]);
        $rendered_mbox = $this->ui->renderer()->render($mbox);
 
        if (!$this->ctrl->isAsynch()) {
            $this->tpl->setContent($rendered_mbox);
        } else {
            echo $rendered_mbox;
            exit;
        }
    }
 
    public function edit(): string
    {
        $this->setOutputMode(self::EDIT);
        $html = $this->showPage();
 
        if ($this->isEnabledNotes()) {
            $html .= "<br /><br />" . $this->getNotesHTML();
        }
 
        return $html;
    }
 
    public function getBlockingInfoMessage(): string
    {
        $ui = $this->ui;
 
        $lock = $this->getPageObject()->getEditLockInfo();
        $info = $this->lng->txt("cont_got_lock_release");
        $info = str_replace("%1", ilDatePresentation::formatDate(new ilDateTime($lock["edit_lock_until"], IL_CAL_UNIX)), $info);
 
        $mbox = $ui->factory()->messageBox()->info($info);
 
        return $ui->renderer()->render($mbox);
    }
 
    public function insertJSAtPlaceholder(): string
    {
        $pl_pc_id = $this->request->getPlaceholderPCId();
        $this->obj->buildDom();
        $this->obj->addHierIDs();
        $this->setOpenPlaceHolder($pl_pc_id);
        return $this->edit();
    }
 
    public function presentation(string $a_mode = self::PRESENTATION): string
    {
        $this->setOutputMode($a_mode);
 
        return $this->showPage();
    }
 
    public function getHTML(): string
    {
        $this->getTabs("preview");
        return $this->showPage();
    }
 
    public function showMediaFullscreen(int $a_style_id = 0): void
    {
        $this->tpl = new ilGlobalTemplate("tpl.fullscreen.html", true, true, "components/ILIAS/COPage");
        $this->tpl->setCurrentBlock("ContentStyle");
        $this->tpl->setVariable("LOCATION_CONTENT_STYLESHEET", 0);
        $this->tpl->parseCurrentBlock();
 
        $this->tpl->setVariable(
            "PAGETITLE",
            " - " . ilObject::_lookupTitle($this->request->getMobId())
        );
        $this->tpl->setVariable("LOCATION_STYLESHEET", ilUtil::getStyleSheetLocation());
        $this->tpl->setCurrentBlock("ilMedia");
 
        $media_obj = new ilObjMediaObject($this->request->getMobId());
        if ($this->requested_pg_id > 0) {
            $pg_obj = ilPageObjectFactory::getInstance($this->obj->getParentType(), $this->requested_pg_id);
            $pg_obj->buildDom();
 
            $xml = "<dummy>";
            // todo: we get always the first alias now (problem if mob is used multiple
            // times in page)
            $xml .= $pg_obj->getMediaAliasElement($this->request->getMobId());
        } else {
            $xml = "<dummy>";
            $xml .= $media_obj->getXML(IL_MODE_ALIAS);
        }
        $xml .= $media_obj->getXML(IL_MODE_OUTPUT);
        $xml .= "</dummy>";
 
 
        $wb_path = ilFileUtils::getWebspaceDir("output") . "/";
        $mode = "fullscreen";
        $params = array('mode' => $mode,
        'enable_html_mob' => ilObjMediaObject::isTypeAllowed("html") ? "y" : "n",
        'webspace_path' => $wb_path);
        $output = $this->xsl->process($xml, $params);
 
        // unmask user html
        $this->tpl->setVariable("MEDIA_CONTENT", $output);
    }
 
    public function displayValidationError($a_error): void
    {
        if (is_array($a_error)) {
            $error_str = "<strong>Error(s):</strong><br>";
            foreach ($a_error as $error) {
                $err_mess = implode(" - ", $error);
                if (!is_int(strpos($err_mess, ":0:"))) {
                    $error_str .= htmlentities($err_mess) . "<br />";
                }
            }
            $this->tpl->setVariable("MESSAGE", $error_str);
        }
    }
 
    protected function setBackToEditTabs(): void
    {
        $this->tabs_gui->clearTargets();
        $this->tabs_gui->setBackTarget(
            $this->lng->txt("back"),
            $this->ctrl->getLinkTarget($this, "edit")
        );
    }
 
    protected function setBackToHistoryTabs(): void
    {
        $this->tabs_gui->clearTargets();
        $this->tabs_gui->setBackTarget(
            $this->lng->txt("back"),
            $this->ctrl->getLinkTarget($this, "history")
        );
    }
 
    public function history(): string
    {
        if (!$this->getEnableEditing()) {
            return "";
        }
 
        $this->setBackToEditTabs();
 
        $this->tpl->addJavaScript("assets/js/page_history.js");
 
        $table_gui = new ilPageHistoryTableGUI($this, "history");
        $table_gui->setId("hist_table");
        $entries = $this->getPageObject()->getHistoryEntries();
        $entries[] = array('page_id' => $this->getPageObject()->getId(),
            'parent_type' => $this->getPageObject()->getParentType(),
            'hdate' => $this->getPageObject()->getLastChange(),
            'parent_id' => $this->getPageObject()->getParentId(),
            'nr' => 0,
            'sortkey' => 999999,
            'user' => $this->getPageObject()->last_change_user);
        $table_gui->setData($entries);
        return $table_gui->getHTML();
    }
 
    public function rollbackConfirmation(): void
    {
        if (!$this->getEnableEditing()) {
            return;
        }
 
        $c_gui = new ilConfirmationGUI();
 
        // set confirm/cancel commands
        $this->ctrl->setParameter($this, "rollback_nr", $this->requested_old_nr);
        $c_gui->setFormAction($this->ctrl->getFormAction($this, "rollback"));
        $c_gui->setHeaderText($this->lng->txt("cont_rollback_confirmation"));
        $c_gui->setCancel($this->lng->txt("cancel"), "history");
        $c_gui->setConfirm($this->lng->txt("confirm"), "rollback");
 
        $hentry = $this->obj->getHistoryEntry($this->requested_old_nr);
 
        $c_gui->addItem(
            "id[]",
            $this->requested_old_nr,
            ilDatePresentation::formatDate(new ilDateTime($hentry["hdate"], IL_CAL_DATETIME))
        );
 
        $this->tpl->setContent($c_gui->getHTML());
    }
 
    public function rollback(): void
    {
        if (!$this->getEnableEditing()) {
            return;
        }
 
        $hentry = $this->obj->getHistoryEntry(
            $this->request->getString("rollback_nr")
        );
 
        if ($hentry["content"] != "") {
            $this->obj->setXMLContent($hentry["content"]);
            $this->obj->buildDom(true);
            if ($this->obj->update()) {
                $this->ctrl->redirect($this, "history");
            }
        }
        $this->ctrl->redirect($this, "history");
    }
 
    public function setScreenIdComponent(): void
    {
        $this->help->setScreenIdComponent("copg");
    }
 
    public function getMetaDataLink(): string
    {
        $mdtab = "";
        if ($this->use_meta_data) {
            $mdgui = new ilObjectMetaDataGUI(
                $this->meta_data_rep_obj,
                $this->meta_data_type,
                $this->meta_data_sub_obj_id
            );
            $mdtab = $mdgui->getTab();
            if ($mdtab) {
                $this->tabs_gui->addTarget(
                    "meta_data",
                    $mdtab,
                    "",
                    "ilobjectmetadatagui"
                );
            }
        }
        return (string) $mdtab;
    }
 
    public function getTabs(string $a_activate = ""): void
    {
        if (in_array($this->getOutputMode(), [self::OFFLINE])) {
            return;
        }
        $this->setScreenIdComponent();
 
        if (!$this->getEnabledTabs()) {
            return;
        }
 
        // back to upper context
        if (!$this->getEditPreview()) {
            $this->tabs_gui->addTarget("pg", $this->ctrl->getLinkTarget($this, "preview"), array("", "preview"));
        } else {
            $this->tabs_gui->addTarget("cont_preview", $this->ctrl->getLinkTarget($this, "preview"), array("", "preview"));
        }
 
        if ($this->use_meta_data) {
            $mdgui = new ilObjectMetaDataGUI(
                $this->meta_data_rep_obj,
                $this->meta_data_type,
                $this->meta_data_sub_obj_id
            );
            $mdtab = $mdgui->getTab();
            if ($mdtab) {
                $this->tabs_gui->addTarget(
                    "meta_data",
                    $mdtab,
                    "",
                    "ilobjectmetadatagui"
                );
            }
        }
 
        $lm_set = new ilSetting("lm");
 
        // external hook to add tabs
        if (is_array($this->tab_hook)) {
            $func = $this->tab_hook["func"];
            $this->tab_hook["obj"]->$func();
        }
    }
 
    public function compareVersion(): string
    {
        if (!$this->getEnableEditing()) {
            return "";
        }
 
        $tpl = new ilTemplate("tpl.page_compare.html", true, true, "components/ILIAS/COPage");
        $this->setBackToHistoryTabs();
 
        $pg = $this->obj;
        $l_page = ilPageObjectFactory::getInstance($pg->getParentType(), $pg->getId(), $this->request->getInt("left"), $pg->getLanguage());
        $r_page = ilPageObjectFactory::getInstance($pg->getParentType(), $pg->getId(), $this->request->getInt("right"), $pg->getLanguage());
 
        $compare = $this->compare->compare(
            $this->getPageObject(),
            $l_page,
            $r_page
        );
 
        // left page
        $lpage = $compare["l_page"];
        $cfg = $this->getPageConfig();
        $cfg->setPreventHTMLUnmasking(true);
 
        $this->setOutputMode(self::PREVIEW);
        $this->setPageObject($lpage);
        $this->setPresentationTitle($this->getPresentationTitle());
        $this->setCompareMode(true);
 
        $lhtml = $this->showPage();
        $lhtml = $this->replaceDiffTags($lhtml);
        $lhtml = str_replace("&lt;br /&gt;", "<br />", $lhtml);
        $tpl->setVariable("LEFT", $lhtml);
 
        // right page
        $rpage = $compare["r_page"];
        $this->setPageObject($rpage);
        $this->setPresentationTitle($this->getPresentationTitle());
        $this->setCompareMode(true);
        $this->setOutputMode(self::PREVIEW);
 
        $rhtml = $this->showPage();
        $rhtml = $this->replaceDiffTags($rhtml);
        $rhtml = str_replace("&lt;br /&gt;", "<br />", $rhtml);
        $tpl->setVariable("RIGHT", $rhtml);
 
        $tpl->setVariable("TXT_NEW", $this->lng->txt("cont_pc_new"));
        $tpl->setVariable("TXT_MODIFIED", $this->lng->txt("cont_pc_modified"));
        $tpl->setVariable("TXT_DELETED", $this->lng->txt("cont_pc_deleted"));
 
        return $tpl->get();
    }
 
    public function replaceDiffTags(string $a_html): string
    {
        $a_html = str_replace("[ilDiffInsStart]", '<span class="ilDiffIns">', $a_html);
        $a_html = str_replace("[ilDiffDelStart]", '<span class="ilDiffDel">', $a_html);
        $a_html = str_replace("[ilDiffInsEnd]", '</span>', $a_html);
        $a_html = str_replace("[ilDiffDelEnd]", '</span>', $a_html);
 
        return $a_html;
    }
 
    public function editActivation(): void
    {
        $this->setBackToEditTabs();
 
        $atpl = new ilTemplate("tpl.page_activation.php", true, true, "components/ILIAS/COPage");
        $this->initActivationForm();
        $this->getActivationFormValues();
        $atpl->setVariable("FORM", $this->form->getHTML());
        $this->tpl->setContent($atpl->get());
    }
 
    public function initActivationForm(): void
    {
        $this->form = new ilPropertyFormGUI();
        $this->form->setFormAction($this->ctrl->getFormAction($this));
        $this->form->setTitle($this->lng->txt("cont_page_activation"));
 
        // activation type radio
        $rad = new ilRadioGroupInputGUI($this->lng->txt("cont_activation"), "activation");
        $rad_op1 = new ilRadioOption($this->lng->txt("cont_activated"), "activated");
 
        $rad->addOption($rad_op1);
        $rad_op2 = new ilRadioOption($this->lng->txt("cont_deactivated"), "deactivated");
        $rad->addOption($rad_op2);
        $rad_op3 = new ilRadioOption($this->lng->txt("cont_scheduled_activation"), "scheduled");
 
        $dt_prop = new ilDateTimeInputGUI($this->lng->txt("cont_start"), "start");
        $dt_prop->setRequired(true);
        $dt_prop->setShowTime(true);
        $rad_op3->addSubItem($dt_prop);
        $dt_prop2 = new ilDateTimeInputGUI($this->lng->txt("cont_end"), "end");
        $dt_prop2->setRequired(true);
        $dt_prop2->setShowTime(true);
        $rad_op3->addSubItem($dt_prop2);
 
        // show activation information
        $cb = new ilCheckboxInputGUI($this->lng->txt("cont_show_activation_info"), "show_activation_info");
        $cb->setInfo($this->lng->txt("cont_show_activation_info_info"));
        $rad_op3->addSubItem($cb);
 
 
        $rad->addOption($rad_op3);
 
        $this->form->addCommandButton("saveActivation", $this->lng->txt("save"));
 
        $this->form->addItem($rad);
    }
 
    public function getActivationFormValues(): void
    {
        $activation = "deactivated";
        if ($this->getPageObject()->getActive()) {
            $activation = "activated";
        }
 
        $dt_prop = $this->form->getItemByPostVar("start");
        if ($this->getPageObject()->getActivationStart() != "") {
            $activation = "scheduled";
            $dt_prop->setDate(new ilDateTime(
                $this->getPageObject()->getActivationStart(),
                IL_CAL_DATETIME
            ));
        }
        $dt_prop = $this->form->getItemByPostVar("end");
        if ($this->getPageObject()->getActivationEnd() != "") {
            $activation = "scheduled";
            $dt_prop->setDate(new ilDateTime(
                $this->getPageObject()->getActivationEnd(),
                IL_CAL_DATETIME
            ));
        }
 
        $this->form->getItemByPostVar("activation")->setValue($activation);
        $this->form->getItemByPostVar("show_activation_info")->setChecked($this->getPageObject()->getShowActivationInfo());
    }
 
    public function saveActivation(): void
    {
        $this->initActivationForm();
 
        if ($this->form->checkInput()) {
            $this->getPageObject()->setActive(true);
            $this->getPageObject()->setActivationStart(null);
            $this->getPageObject()->setActivationEnd(null);
            $this->getPageObject()->setShowActivationInfo(
                $this->request->getString("show_activation_info")
            );
            $activation = $this->request->getString("activation");
            if ($activation == "deactivated") {
                $this->getPageObject()->setActive(false);
            }
            if ($activation == "scheduled") {
                $this->getPageObject()->setActive(false);
                $this->getPageObject()->setActivationStart(
                    $this->form->getItemByPostVar("start")->getDate()->get(IL_CAL_DATETIME)
                );
                $this->getPageObject()->setActivationEnd(
                    $this->form->getItemByPostVar("end")->getDate()->get(IL_CAL_DATETIME)
                );
            }
            $this->getPageObject()->update();
            $this->tpl->setOnScreenMessage('success', $this->lng->txt("msg_obj_modified"), true);
            $this->ctrl->redirect($this, "editActivation");
        }
        $this->form->setValuesByPost();
        $this->tpl->setContent($this->form->getHTML());
    }
 
    public function getNotesHTML(
        ?object $a_content_object = null,
        bool $a_enable_private_notes = true,
        bool $a_enable_public_notes = false,
        bool $a_enable_notes_deletion = false,
        ?callable $a_callback = null,
        bool $export = false
    ): string {
        // scorm 2004 page gui
        if (!$a_content_object) {
            throw new ilException("No content object given.");
            /*
            $notes_gui = new ilNoteGUI(
                $this->notes_parent_id,
                $this->obj->getId(),
                "pg"
            );
 
            $a_enable_private_notes = true;
            $a_enable_public_notes = true;
            $a_enable_notes_deletion = false;
            $notes_gui->setUseObjectTitleHeader(false);*/
        }
        // wiki page gui, blog posting gui
        else {
            /*
            $notes_gui = new ilNoteGUI(
                $a_content_object->getParentId(),
                $a_content_object->getId(),
                $a_content_object->getParentType()
            );*/
            $comments_gui = $this->notes->gui()->getCommentsGUI(
                $a_content_object->getParentId(),
                $a_content_object->getId(),
                $a_content_object->getParentType()
            );
            $comments_gui->setUseObjectTitleHeader(false);
        }
 
        if ($a_enable_private_notes) {
            $comments_gui->enablePrivateNotes();
        }
        if ($a_enable_public_notes) {
            $comments_gui->enablePublicNotes();
            if ($a_enable_notes_deletion) {
                $comments_gui->enablePublicNotesDeletion(true);
            }
        }
        if ($export) {
            $comments_gui->setExportMode();
        }
 
        if ($a_callback) {
            $comments_gui->addObserver($a_callback);
        }
 
        $next_class = $this->ctrl->getNextClass($this);
        if (in_array($next_class, ["ilnotegui", "ilcommentgui"])) {
            $html = $this->ctrl->forwardCommand($comments_gui);
        } else {
            $html = $comments_gui->getListHTML();
        }
        return $html;
    }
 
    public function processAnswer(): void
    {
        ilPageQuestionProcessor::saveQuestionAnswer(
            $this->request->getString("type"),
            $this->request->getString("id"),
            $this->request->getString("answer")
        );
    }
 
 
    //
    // Initially opened content (e.g. used in learning modules), that
    // is presented in another than the main content area (e.g. a picture in
    // the bottom left area)
    //
 
    public function initialOpenedContent(): void
    {
        $this->tabs_gui->activateTab("edit");
        $form = $this->initOpenedContentForm();
        $this->tpl->setContent($form->getHTML());
    }
 
    public function initOpenedContentForm(): ilPropertyFormGUI
    {
        $form = new ilPropertyFormGUI();
 
        // link input
        $ac = new ilLinkInputGUI($this->lng->txt('cont_resource'), 'opened_content');
        $ac->setAllowedLinkTypes(ilLinkInputGUI::INT);
        $ac->setInternalLinkDefault("Media_Media", 0);
        $ac->setInternalLinkFilterTypes(array("PageObject_FAQ", "GlossaryItem", "Media_Media", "Media_FAQ"));
        $val = $this->obj->getInitialOpenedContent();
        if (($val["id"] ?? '') != "" && ($val["type"] ?? '') != "") {
            $ac->setValue($val["type"] . "|" . $val["id"] . "|" . $val["target"]);
        }
 
        $form->addItem($ac);
 
        $form->addCommandButton("saveInitialOpenedContent", $this->lng->txt("save"));
        $form->addCommandButton("edit", $this->lng->txt("cancel"));
        $form->setTitle($this->lng->txt("cont_initial_attached_content"));
        $form->setFormAction($this->ctrl->getFormAction($this));
 
        return $form;
    }
 
    public function saveInitialOpenedContent(): void
    {
        $this->obj->saveInitialOpenedContent(
            $this->request->getString("opened_content_ajax_type"),
            $this->request->getInt("opened_content_ajax_id"),
            $this->request->getString("opened_content_ajax_target")
        );
 
        $this->tpl->setOnScreenMessage('success', $this->lng->txt("msg_obj_modified"));
        $this->ctrl->redirect($this, "edit");
    }
 
 
 
    public function switchToLanguage(): void
    {
        $l = $this->request->getString("totransl");
        $p = $this->getPageObject();
        if (!$this->checkLangPageAvailable($p->getId(), $l)) {
            $this->confirmPageTranslationCreation();
            return;
        }
        $this->ctrl->setParameter($this, "transl", $l);
        $this->ctrl->redirect($this, "edit");
    }
 
    protected function checkLangPageAvailable(int $id, string $lang): bool
    {
        $p = $this->getPageObject();
        return ilPageObject::_exists($this->getParentType(), $id, $lang);
    }
 
    public function confirmPageTranslationCreation(): void
    {
        $l = $this->request->getString("totransl");
        $this->ctrl->setParameter($this, "totransl", $l);
        $this->lng->loadLanguageModule("meta");
 
        $cgui = new ilConfirmationGUI();
        $cgui->setFormAction($this->ctrl->getFormAction($this));
        $cgui->setHeaderText($this->lng->txt("cont_page_translation_does_not_exist") . ": " .
            $this->lng->txt("meta_l_" . $l));
        $cgui->setCancel($this->lng->txt("cancel"), "editMasterLanguage");
        $cgui->setConfirm($this->lng->txt("confirm"), "createPageTranslation");
        $this->tpl->setContent($cgui->getHTML());
    }
 
    public function editMasterLanguage(): void
    {
        $this->ctrl->setParameter($this, "transl", "-");
        $this->ctrl->redirect($this, "edit");
    }
 
    public function createPageTranslation(): void
    {
        $l = $this->request->getString("totransl");
 
        $p = ilPageObjectFactory::getInstance(
            $this->getPageObject()->getParentType(),
            $this->getPageObject()->getId(),
            0,
            "-"
        );
 
        $p->copyPageToTranslation($l);
        $this->ctrl->setParameter($this, "transl", $l);
        $this->ctrl->redirect($this, "edit");
    }
 
    public function releasePageLock(): void
    {
        $this->getPageObject()->releasePageLock();
        $this->tpl->setOnScreenMessage('success', $this->lng->txt("cont_page_lock_released"), true);
        $this->finishEditing();
    }
 
    public function finishEditing(): void
    {
        $this->ctrl->redirect($this, "preview");
    }
 
    protected function isPageContainerToBeRendered(): bool
    {
        return (
            $this->getRenderPageContainer() || ($this->getOutputMode() == self::PREVIEW && $this->getPageConfig()->getUsePageContainer())
        );
    }
 
    public function getPagePermaLink(): string
    {
        return "";
    }
 
    protected function addResourcesToTemplate(ilGlobalTemplateInterface $tpl): void
    {
        $collector = new \ILIAS\COPage\ResourcesCollector($this->getOutputMode(), $this->getPageObject());
 
        foreach ($collector->getJavascriptFiles() as $js) {
            $tpl->addJavaScript($js);
        }
 
        foreach ($collector->getCssFiles() as $css) {
            $tpl->addCss($css);
        }
 
        foreach ($collector->getOnloadCode() as $code) {
            $tpl->addOnLoadCode($code);
        }
    }
 
    public function getAdditionalPageActions(): array
    {
        return [];
    }
 
    public function afterDeleteContents(): void
    {
    }
 
}