class.ilLMNavigationRendererGUI.php

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<?php
 
class ilLMNavigationRendererGUI
{
    protected ilToolbarGUI $toolbar;
    protected \ILIAS\DI\UIServices $ui;
    protected string $requested_frame;
    protected int $requested_back_pg;
    protected int $requested_obj_id;
    protected ilLMPresentationLinker $linker;
    protected bool $deactivated_page;
    protected bool $chapter_has_no_active_page;
    protected ilObjUser $user;
    protected ?int $current_page;
    protected ilObjLearningModule $lm;
    protected ilLanguage $lng;
    protected bool $offline;
    protected ilLMTracker $tracker;
    protected ilLMTree $lm_tree;
    protected ilLMPresentationGUI $parent_gui;
    protected ilSetting $lm_set;
    protected ilGlobalTemplateInterface $main_tpl;
    protected string $lang;
    protected ilLMNavigationStatus $navigation_status;
 
    public function __construct(
        ilLMPresentationService $service,
        ilLMPresentationGUI $parent_gui,
        ilLanguage $lng,
        ilObjUser $user,
        ilGlobalTemplateInterface $main_tpl,
        int $requested_obj_id,
        string $requested_back_pg,
        string $requested_frame,
        ilToolbarGUI $toolbar,
        \ILIAS\DI\UIServices $ui
    ) {
        $this->user = $user;
        $this->toolbar = $toolbar;
        $this->ui = $ui;
        $this->lm_tree = $service->getLMTree();
        $this->current_page = $service->getNavigationStatus()->getCurrentPage();
        $this->lm = $service->getLearningModule();
        $this->lm_set = $service->getSettings();
        $this->lng = $lng;
        $this->offline = $service->getPresentationStatus()->offline();
        $this->tracker = $service->getTracker();
        $this->parent_gui = $parent_gui;
        $this->chapter_has_no_active_page = $service->getNavigationStatus()->isChapterWithoutActivePage();
        $this->deactivated_page = $service->getNavigationStatus()->isDeactivatedPage();
        $this->linker = $service->getLinker();
        $this->navigation_status = $service->getNavigationStatus();
        $this->requested_obj_id = $requested_obj_id;
        $back_pg = explode(":", $requested_back_pg);
        $this->requested_back_pg = (int) $back_pg[0];
        $this->requested_frame = $requested_frame;
        $this->main_tpl = $main_tpl;
        $this->lang = $service->getPresentationStatus()->getLang();
    }
 
    public function renderTop(): string
    {
        return $this->render();
    }
 
    public function renderBottom(): string
    {
        return $this->render(false);
    }
 
    protected function render(bool $top = true): string
    {
        $this->toolbar->setStickyItems([]);
 
        $page_id = $this->current_page;
 
        $tpl = new ilTemplate("tpl.lm_navigation.html", true, true, "components/ILIAS/LearningModule/Presentation");
 
        if (empty($page_id)) {
            return "";
        }
 
        // process navigation for free page
        $back_pg = $this->navigation_status->getBackPageId();
        if ($back_pg > 0) {
            $back_href =
                $this->linker->getLink(
                    "layout",
                    $back_pg,
                    "",
                    "",
                    "reduce"
                );
            $back_img =
                ilUtil::getImagePath("nav/nav_arr2_L.png", false, "output", $this->offline);
            $tpl->setCurrentBlock("ilLMNavigation_Prev");
            $tpl->setVariable("IMG_PREV", $back_img);
            $tpl->setVariable("HREF_PREV", $back_href);
            $tpl->setVariable("TXT_PREV", $this->lng->txt("back"));
            $tpl->setVariable("ALT_PREV", $this->lng->txt("back"));
            $tpl->setVariable("SPACER_PREV", $this->offline
                ? "images/media/spacer.png"
                : ilUtil::getImagePath("media/spacer.png"));
            $tpl->parseCurrentBlock();
            if ($top) {
                $b = $this->ui->factory()->button()->standard(
                    "<span class=\"glyphicon glyphicon-chevron-left \" aria-hidden=\"true\"></span>",
                    $back_href
                );
                $this->toolbar->addStickyItem($b);
            }
        } else {
            $pre_id = $this->navigation_status->getPredecessorPageId();
            if ($pre_id > 0) {
                // get presentation title
                $prev_title = ilLMPageObject::_getPresentationTitle(
                    $pre_id,
                    $this->lm->getPageHeader(),
                    $this->lm->isActiveNumbering(),
                    (bool) $this->lm_set->get("time_scheduled_page_activation"),
                    false,
                    0,
                    $this->lang,
                    true
                );
                $prev_title = ilStr::shortenTextExtended($prev_title, 50, true);
                $prev_img =
                    ilUtil::getImagePath("nav/nav_arr_L.png", false, "output", $this->offline);
 
                if (!$this->lm->cleanFrames()) {
                    $prev_href =
                        $this->linker->getLink(
                            "layout",
                            $pre_id,
                            $this->requested_frame
                        );
                    $prev_target = "";
                } else {
                    if (!$this->offline) {
                        $prev_href =
                            $this->linker->getLink("layout", $pre_id);
                    } else {
                        $prev_href =
                            $this->linker->getLink("layout", $pre_id);
                    }
                }
 
                $tpl->setCurrentBlock("ilLMNavigation_Prev");
                $tpl->setVariable("IMG_PREV", $prev_img);
                $tpl->setVariable("HREF_PREV", $prev_href);
                $tpl->setVariable("TXT_PREV", $prev_title);
                $tpl->setVariable("ALT_PREV", $this->lng->txt("previous"));
                $tpl->setVariable("SPACER_PREV", $this->offline
                    ? "images/media/spacer.png"
                    : ilUtil::getImagePath("media/spacer.png"));
 
                if ($top) {
                    $b = $this->ui->factory()->button()->standard(
                        "<span class=\"glyphicon glyphicon-chevron-left \" aria-hidden=\"true\"></span>",
                        $prev_href
                    );
                    $this->toolbar->addStickyItem($b);
                }
            } else {
                if ($top) {
                    $b = $this->ui->factory()->button()->standard(
                        "<span class=\"glyphicon glyphicon-chevron-left \" aria-hidden=\"true\"></span>",
                        "#"
                    )->withUnavailableAction();
                    $this->toolbar->addStickyItem($b);
                }
            }
 
            $this->addDropdown();
 
            $succ_id = $this->navigation_status->getSuccessorPageId();
            if ($succ_id > 0) {
                // get presentation title
                $succ_title = ilLMPageObject::_getPresentationTitle(
                    $succ_id,
                    $this->lm->getPageHeader(),
                    $this->lm->isActiveNumbering(),
                    (bool) $this->lm_set->get("time_scheduled_page_activation"),
                    false,
                    0,
                    $this->lang,
                    true
                );
                $succ_title = ilStr::shortenTextExtended($succ_title, 50, true);
                $succ_img =
                    ilUtil::getImagePath("nav/nav_arr_R.png", false, "output", $this->offline);
                if (!$this->lm->cleanFrames()) {
                    $succ_href =
                        $this->linker->getLink(
                            "layout",
                            $succ_id,
                            $this->requested_frame
                        );
                    $succ_target = "";
                } else {
                    if (!$this->offline) {
                        $succ_href =
                            $this->linker->getLink("layout", $succ_id);
                    } else {
                        $succ_href =
                            $this->linker->getLink("layout", $succ_id);
                    }
                }
 
                $tpl->setCurrentBlock("ilLMNavigation_Next");
                $tpl->setVariable("IMG_SUCC", $succ_img);
                $tpl->setVariable("HREF_SUCC", $succ_href);
                $tpl->setVariable("TXT_SUCC", $succ_title);
                $tpl->setVariable("ALT_SUCC", $this->lng->txt("next"));
                $tpl->setVariable("SPACER_SUCC", $this->offline
                    ? "images/media/spacer.png"
                    : ilUtil::getImagePath("media/spacer.png"));
                $tpl->parseCurrentBlock();
 
                // check if successor page is not restricted
                if (!$this->offline) {
                    if ($this->lm->getRestrictForwardNavigation()) {
                        if ($this->tracker->hasPredIncorrectAnswers($succ_id)) {
                            $this->main_tpl->addOnLoadCode("il.LearningModule.hideNextNavigation();");
                        }
                    }
                }
                if ($top) {
                    $b = $this->ui->factory()->button()->standard(
                        "<span class=\"glyphicon glyphicon-chevron-right \" aria-hidden=\"true\"></span>",
                        $succ_href
                    );
                    $this->toolbar->addStickyItem($b);
                }
            } else {
                if ($top) {
                    $b = $this->ui->factory()->button()->standard(
                        "<span class=\"glyphicon glyphicon-chevron-right \" aria-hidden=\"true\"></span>",
                        "#"
                    )->withUnavailableAction();
                    $this->toolbar->addStickyItem($b);
                }
            }
        }
        $tpl->setVariable("CLASS", ($top) ? "tnav_Top" : "bnav_Bottom");
 
        return $tpl->get();
    }
 
    protected function addDropdown(): void
    {
        $nodes = $this->lm_tree->getSubTree($this->lm_tree->getNodeData($this->lm_tree->getRootId()));
        //$nodes = $this->filterNonAccessibleNode($nodes);
 
        $actions = [];
 
        foreach ($nodes as $node) {
            $disabled = false;
 
            // check page activation
            $active = ilLMPage::_lookupActive(
                $node["obj_id"],
                $this->lm->getType(),
                (bool) $this->lm_set->get("time_scheduled_page_activation")
            );
 
            if ($node["type"] === "pg" &&
                !$active) {
                continue;
            }
 
            $text = "";
            $checked = false;
 
            switch ($node["type"]) {
                // page
                case "pg":
                    if ($this->lm->getTOCMode() !== "pages") {
                        continue 2;
                    }
                    $text =
                        ilLMPageObject::_getPresentationTitle(
                            $node["obj_id"],
                            $this->lm->getPageHeader(),
                            $this->lm->isActiveNumbering(),
                            (bool) $this->lm_set->get("time_scheduled_page_activation"),
                            false,
                            $this->lm->getId(),
                            $this->lang,
                            true
                        );
 
                    break;
 
                    // learning module
                case "du":
                    $text = "";
                    break;
 
                    // chapter
                case "st":
                    $text =
                        ilStructureObject::_getPresentationTitle(
                            $node["obj_id"],
                            ilLMObject::CHAPTER_TITLE,
                            $this->lm->isActiveNumbering(),
                            (bool) $this->lm_set->get("time_scheduled_page_activation"),
                            false,
                            $this->lm->getId(),
                            $this->lang,
                            true
                        );
                    break;
            }
 
            if (!ilObjContentObject::_checkPreconditionsOfPage(
                $this->lm->getRefId(),
                $this->lm->getId(),
                $node["obj_id"]
            )) {
                $disabled = true;
                $text .= " (" . $this->lng->txt("cont_no_access") . ")";
            }
 
            $href = $this->linker->getLink("layout", $node["obj_id"]);
 
            if ($text !== "") {
                if ($this->lm->getTOCMode() === "pages" && $this->current_page == $node["obj_id"]) {
                    $text = "» " . $text;
                }
                if ($this->lm->getTOCMode() !== "pages") {
                    if ($this->lm_tree->getParentId($this->current_page) == $node["obj_id"]) {
                        $text = "» " . $text;
                    }
                }
                $text = str_pad("", ($node["depth"] - 1) * 12, "&nbsp;") . $text;
                $button = $this->ui->factory()->button()->shy(
                    $text,
                    $href
                );
                if ($disabled) {
                    $button = $button->withUnavailableAction();
                }
                $actions[] = $button;
            }
        }
 
        $title = "";
        if ($this->lm->getTOCMode() === "pages") {
            $title = ilLMPageObject::_getPresentationTitle(
                $this->current_page,
                $this->lm->getPageHeader(),
                $this->lm->isActiveNumbering(),
                (bool) $this->lm_set->get("time_scheduled_page_activation"),
                false,
                $this->lm->getId(),
                $this->lang,
                true
            );
        } else {
            $st_id = $this->lm_tree->getParentId($this->current_page);
            if ($st_id > 0) {
                $title = ilStructureObject::_getPresentationTitle(
                    $st_id,
                    ilLMObject::CHAPTER_TITLE,
                    $this->lm->isActiveNumbering(),
                    (bool) $this->lm_set->get("time_scheduled_page_activation"),
                    false,
                    $this->lm->getId(),
                    $this->lang,
                    true
                );
            }
        }
 
        $title = "<span style='vertical-align: bottom; max-width:60px; display: inline-block; overflow: hidden; white-space: nowrap; text-overflow: ellipsis;'>" . $title . "</span>";
 
        $this->toolbar->addStickyItem(
            $this->ui->factory()->dropdown()->standard($actions)->withLabel($title)
        );
    }
}