class.ilAssQuestionPreviewGUI.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */


class ilAssQuestionPreviewGUI
{
    const CMD_SHOW = 'show';
    const CMD_RESET = 'reset';
    const CMD_INSTANT_RESPONSE = 'instantResponse';
    const CMD_HANDLE_QUESTION_ACTION = 'handleQuestionAction';
    const CMD_GATEWAY_CONFIRM_HINT_REQUEST = 'gatewayConfirmHintRequest';
    const CMD_GATEWAY_SHOW_HINT_LIST = 'gatewayShowHintList';

    const TAB_ID_QUESTION_PREVIEW = 'preview';
    
    protected $ctrl;
    
    protected $tabs;

    protected $tpl;

    protected $lng;

    protected $db;

    protected $user;

    protected $questionGUI;

    protected $questionOBJ;

    protected $previewSettings;

    protected $previewSession;

    protected $hintTracking;
    
    public function __construct(ilCtrl $ctrl, ilTabsGUI $tabs, ilTemplate $tpl, ilLanguage $lng, ilDBInterface $db, ilObjUser $user)
    {
        $this->ctrl = $ctrl;
        $this->tabs = $tabs;
        $this->tpl = $tpl;
        $this->lng = $lng;
        $this->db = $db;
        $this->user = $user;
    }

    public function initQuestion($questionId, $parentObjId)
    {
        require_once 'Modules/TestQuestionPool/classes/class.assQuestion.php';
        
        $this->questionGUI = assQuestion::instantiateQuestionGUI($questionId);
        $this->questionOBJ = $this->questionGUI->object;

        $this->questionOBJ->setObjId($parentObjId);

        $this->questionGUI->setQuestionTabs();
        $this->questionGUI->outAdditionalOutput();
        
        $this->questionGUI->populateJavascriptFilesRequiredForWorkForm($this->tpl);
        $this->questionOBJ->setOutputType(OUTPUT_JAVASCRIPT); // TODO: remove including depending stuff
            
        $this->questionGUI->setTargetGui($this);
        $this->questionGUI->setQuestionActionCmd(self::CMD_HANDLE_QUESTION_ACTION);
        
        $this->questionGUI->setRenderPurpose(assQuestionGUI::RENDER_PURPOSE_DEMOPLAY);
    }

    public function initPreviewSettings($parentRefId)
    {
        require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionPreviewSettings.php';
        $this->previewSettings = new ilAssQuestionPreviewSettings($parentRefId);
        
        $this->previewSettings->init();
    }

    public function initPreviewSession($userId, $questionId)
    {
        require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionPreviewSession.php';
        $this->previewSession = new ilAssQuestionPreviewSession($userId, $questionId);

        $this->previewSession->init();
    }
    
    public function initHintTracking()
    {
        require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionPreviewHintTracking.php';
        $this->hintTracking = new ilAssQuestionPreviewHintTracking($this->db, $this->previewSession);
    }
    
    public function initStyleSheets()
    {
        include_once("./Services/Style/Content/classes/class.ilObjStyleSheet.php");
        
        $this->tpl->setCurrentBlock("ContentStyle");
        $this->tpl->setVariable("LOCATION_CONTENT_STYLESHEET", ilObjStyleSheet::getContentStylePath(0));
        $this->tpl->parseCurrentBlock();

        $this->tpl->setCurrentBlock("SyntaxStyle");
        $this->tpl->setVariable("LOCATION_SYNTAX_STYLESHEET", ilObjStyleSheet::getSyntaxStylePath());
        $this->tpl->parseCurrentBlock();
    }
    
    public function executeCommand()
    {
        global $DIC; /* @var \ILIAS\DI\Container $DIC */
        $ilHelp = $DIC['ilHelp']; /* @var ilHelpGUI $ilHelp */
        $ilHelp->setScreenIdComponent('qpl');

        $this->tabs->setTabActive(self::TAB_ID_QUESTION_PREVIEW);
        
        $this->lng->loadLanguageModule('content');
        
        $nextClass = $this->ctrl->getNextClass($this);
        
        switch ($nextClass) {
            case 'ilassquestionhintrequestgui':
                
                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionHintRequestGUI.php';
                $gui = new ilAssQuestionHintRequestGUI($this, self::CMD_SHOW, $this->questionGUI, $this->hintTracking);

                $this->ctrl->forwardCommand($gui);

                break;

            case 'ilassspecfeedbackpagegui':
            case 'ilassgenfeedbackpagegui':
                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionFeedbackPageObjectCommandForwarder.php';
                $forwarder = new ilAssQuestionFeedbackPageObjectCommandForwarder($this->questionOBJ, $this->ctrl, $this->tabs, $this->lng);
                $forwarder->forward();
                break;
            
            default:

                $cmd = $this->ctrl->getCmd(self::CMD_SHOW) . 'Cmd';
                
                $this->$cmd();
        }
    }
    
    private function showCmd()
    {
        $tpl = new ilTemplate('tpl.qpl_question_preview.html', true, true, 'Modules/TestQuestionPool');

        $tpl->setVariable('PREVIEW_FORMACTION', $this->ctrl->getFormAction($this, self::CMD_SHOW));

        $this->populatePreviewToolbar($tpl);
        
        $this->populateQuestionOutput($tpl);
        
        $this->populateQuestionNavigation($tpl);

        if ($this->isShowGenericQuestionFeedbackRequired()) {
            $this->populateGenericQuestionFeedback($tpl);
        }

        if ($this->isShowSpecificQuestionFeedbackRequired()) {
            $this->populateSpecificQuestionFeedback($tpl);
        }
        
        if ($this->isShowBestSolutionRequired()) {
            $this->populateSolutionOutput($tpl);
        }
        
        $this->tpl->setContent($tpl->get());
    }
    
    private function resetCmd()
    {
        $this->previewSession->setRandomizerSeed(null);
        $this->previewSession->setParticipantsSolution(null);
        $this->previewSession->resetRequestedHints();
        $this->previewSession->setInstantResponseActive(false);

        ilUtil::sendInfo($this->lng->txt('qst_preview_reset_msg'), true);
        
        $this->ctrl->redirect($this, self::CMD_SHOW);
    }
    
    private function instantResponseCmd()
    {
        if ($this->saveQuestionSolution()) {
            $this->previewSession->setInstantResponseActive(true);
        } else {
            $this->previewSession->setInstantResponseActive(false);
        }
        
        $this->ctrl->redirect($this, self::CMD_SHOW);
    }
    
    private function handleQuestionActionCmd()
    {
        $this->questionOBJ->persistPreviewState($this->previewSession);
        $this->ctrl->redirect($this, self::CMD_SHOW);
    }
    
    private function populatePreviewToolbar(ilTemplate $tpl)
    {
        require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionPreviewToolbarGUI.php';
        $toolbarGUI = new ilAssQuestionPreviewToolbarGUI($this->lng);

        $toolbarGUI->setFormAction($this->ctrl->getFormAction($this, self::CMD_SHOW));
        $toolbarGUI->setResetPreviewCmd(self::CMD_RESET);

        $toolbarGUI->build();
        
        $tpl->setVariable('PREVIEW_TOOLBAR', $this->ctrl->getHTML($toolbarGUI));
    }

    private function populateQuestionOutput(ilTemplate $tpl)
    {
        // FOR WHAT EXACTLY IS THIS USEFUL?
        $this->ctrl->setReturnByClass('ilAssQuestionPageGUI', 'view');
        $this->ctrl->setReturnByClass('ilObjQuestionPoolGUI', 'questions');

        include_once("./Modules/TestQuestionPool/classes/class.ilAssQuestionPageGUI.php");
        $pageGUI = new ilAssQuestionPageGUI($this->questionOBJ->getId());
        $pageGUI->setRenderPageContainer(false);
        $pageGUI->setEditPreview(true);
        $pageGUI->setEnabledTabs(false);

        // FOR WHICH SITUATION IS THIS WORKAROUND NECCESSARY? (sure .. imagemaps, but where this can be done?)
        if (strlen($this->ctrl->getCmd()) == 0 && !isset($_POST['editImagemapForward_x'])) { // workaround for page edit imagemaps, keep in mind
            $this->ctrl->setCmdClass(get_class($pageGUI));
            $this->ctrl->setCmd('preview');
        }

        $this->questionGUI->setPreviewSession($this->previewSession);
        $this->questionGUI->object->setShuffler($this->getQuestionAnswerShuffler());
        
        $questionHtml = $this->questionGUI->getPreview(true, $this->isShowSpecificQuestionFeedbackRequired());
        $this->questionGUI->magicAfterTestOutput();
        
        $pageGUI->setQuestionHTML(array($this->questionOBJ->getId() => $questionHtml));

        //$pageGUI->setHeader($this->questionOBJ->getTitle()); // NO ADDITIONAL HEADER
        $pageGUI->setPresentationTitle($this->questionOBJ->getTitle());

        //$pageGUI->setTemplateTargetVar("ADM_CONTENT"); // NOT REQUIRED, OR IS?

        $tpl->setVariable('QUESTION_OUTPUT', $pageGUI->preview());
    }

    private function populateSolutionOutput(ilTemplate $tpl)
    {
        // FOR WHAT EXACTLY IS THIS USEFUL?
        $this->ctrl->setReturnByClass('ilAssQuestionPageGUI', 'view');
        $this->ctrl->setReturnByClass('ilObjQuestionPoolGUI', 'questions');

        include_once("./Modules/TestQuestionPool/classes/class.ilAssQuestionPageGUI.php");
        $pageGUI = new ilAssQuestionPageGUI($this->questionOBJ->getId());

        $pageGUI->setEditPreview(true);
        $pageGUI->setEnabledTabs(false);

        // FOR WHICH SITUATION IS THIS WORKAROUND NECCESSARY? (sure .. imagemaps, but where this can be done?)
        if (strlen($this->ctrl->getCmd()) == 0 && !isset($_POST['editImagemapForward_x'])) { // workaround for page edit imagemaps, keep in mind
            $this->ctrl->setCmdClass(get_class($pageGUI));
            $this->ctrl->setCmd('preview');
        }

        $this->questionGUI->setPreviewSession($this->previewSession);

        $pageGUI->setQuestionHTML(array($this->questionOBJ->getId() => $this->questionGUI->getSolutionOutput(
            0,
            null,
            false,
            false,
            true,
            false,
            true,
            false,
            false
        )));

        //$pageGUI->setHeader($this->questionOBJ->getTitle()); // NO ADDITIONAL HEADER
        //$pageGUI->setPresentationTitle($this->questionOBJ->getTitle());

        //$pageGUI->setTemplateTargetVar("ADM_CONTENT"); // NOT REQUIRED, OR IS?

        $tpl->setCurrentBlock('solution_output');
        $tpl->setVariable('TXT_CORRECT_SOLUTION', $this->lng->txt('tst_best_solution_is'));
        $tpl->setVariable('SOLUTION_OUTPUT', $pageGUI->preview());
        $tpl->parseCurrentBlock();
    }

    private function populateQuestionNavigation(ilTemplate $tpl)
    {
        require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionRelatedNavigationBarGUI.php';
        $navGUI = new ilAssQuestionRelatedNavigationBarGUI($this->ctrl, $this->lng);

        $navGUI->setInstantResponseCmd(self::CMD_INSTANT_RESPONSE);
        $navGUI->setHintRequestCmd(self::CMD_GATEWAY_CONFIRM_HINT_REQUEST);
        $navGUI->setHintListCmd(self::CMD_GATEWAY_SHOW_HINT_LIST);
        
        $navGUI->setInstantResponseEnabled($this->previewSettings->isInstantFeedbackNavigationRequired());
        $navGUI->setHintProvidingEnabled($this->previewSettings->isHintProvidingEnabled());

        $navGUI->setHintRequestsPossible($this->hintTracking->requestsPossible());
        $navGUI->setHintRequestsExist($this->hintTracking->requestsExist());
        
        $tpl->setVariable('QUESTION_NAVIGATION', $this->ctrl->getHTML($navGUI));
    }
    
    private function populateGenericQuestionFeedback(ilTemplate $tpl)
    {
        if ($this->questionOBJ->isPreviewSolutionCorrect($this->previewSession)) {
            $feedback = $this->questionGUI->getGenericFeedbackOutputForCorrectSolution();
            $cssClass = ilAssQuestionFeedback::CSS_CLASS_FEEDBACK_CORRECT;
        } else {
            $feedback = $this->questionGUI->getGenericFeedbackOutputForIncorrectSolution();
            $cssClass = ilAssQuestionFeedback::CSS_CLASS_FEEDBACK_WRONG;
        }
        
        if (strlen($feedback)) {
            $tpl->setCurrentBlock('instant_feedback_generic');
            $tpl->setVariable('GENERIC_FEEDBACK', $feedback);
            $tpl->setVariable('ILC_FB_CSS_CLASS', $cssClass);
            $tpl->parseCurrentBlock();
        }
    }

    private function populateSpecificQuestionFeedback(ilTemplate $tpl)
    {
        $tpl->setCurrentBlock('instant_feedback_specific');
        $tpl->setVariable('ANSWER_FEEDBACK', $this->questionGUI->getSpecificFeedbackOutput(0, -1));
        $tpl->parseCurrentBlock();
    }

    private function isShowBestSolutionRequired()
    {
        if (!$this->previewSettings->isBestSolutionEnabled()) {
            return false;
        }

        return $this->previewSession->isInstantResponseActive();
    }

    private function isShowGenericQuestionFeedbackRequired()
    {
        if (!$this->previewSettings->isGenericFeedbackEnabled()) {
            return false;
        }

        return $this->previewSession->isInstantResponseActive();
    }

    private function isShowSpecificQuestionFeedbackRequired()
    {
        if (!$this->previewSettings->isSpecificFeedbackEnabled()) {
            return false;
        }

        return $this->previewSession->isInstantResponseActive();
    }
    
    public function saveQuestionSolution()
    {
        return $this->questionOBJ->persistPreviewState($this->previewSession);
    }

    public function gatewayConfirmHintRequestCmd()
    {
        if (!$this->saveQuestionSolution()) {
            $this->previewSession->setInstantResponseActive(false);
            $this->showCmd();
            return;
        }
        
        require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionHintRequestGUI.php';
        
        $this->ctrl->redirectByClass(
            'ilAssQuestionHintRequestGUI',
            ilAssQuestionHintRequestGUI::CMD_CONFIRM_REQUEST
        );
    }

    public function gatewayShowHintListCmd()
    {
        if (!$this->saveQuestionSolution()) {
            $this->previewSession->setInstantResponseActive(false);
            $this->showCmd();
            return;
        }

        require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionHintRequestGUI.php';
        
        $this->ctrl->redirectByClass(
            'ilAssQuestionHintRequestGUI',
            ilAssQuestionHintRequestGUI::CMD_SHOW_LIST
        );
    }

    private function getQuestionAnswerShuffler()
    {
        require_once 'Services/Randomization/classes/class.ilArrayElementShuffler.php';
        $shuffler = new ilArrayElementShuffler();
        
        if (!$this->previewSession->randomizerSeedExists()) {
            $this->previewSession->setRandomizerSeed($shuffler->buildRandomSeed());
        }
        
        $shuffler->setSeed($this->previewSession->getRandomizerSeed());
        
        return $shuffler;
    }
}