partial impl of the group question widget

src/cpp/qtapp/main.cpp

@@ -238,7 +238,7 @@ void CreateMdems(std::vector<Question*>& questions) {
 					mdems[i]->wBack->layout()->addWidget(label);
 				}
 			}
-			mdems[i]->labelCount = groups.size();
+			mdems[i]->labelCount = elements.size();
 		}
 		if (!mdems[i]->wMdem->isVisible()) {
 		   mdems[i]->wMdem->show();

src/cpp/qtapp/trainWindow.cpp

@@ -18,6 +18,7 @@
 #include <qwidget.h>
 #include <QStandardItemModel>
 #include <QDropEvent>
+#include <iostream>
 
 #include "trainWindow.h"
 #include "parser.h"
@@ -53,12 +54,14 @@ QListView          *itemListView;
 
 QStandardItemModel *orderModel;
 
-class CustomListView : public QListView
+QWidget *wGroupQuestion;
+
+class OrderListView : public QListView
 {
     Q_OBJECT
 
 public:
-    explicit CustomListView(QWidget *parent = nullptr) : QListView(parent) {}
+    explicit OrderListView(QWidget *parent = nullptr) : QListView(parent) {}
 
 protected:
     void dropEvent(QDropEvent *event) override
@@ -81,9 +84,38 @@ protected:
     }
 };
 
+class MoveListView : public QListView
+{
+    Q_OBJECT
+
+public:
+    explicit MoveListView(QWidget *parent = nullptr) : QListView(parent) {}
+
+protected:
+    void dropEvent(QDropEvent *event) override
+    {
+        QModelIndex sourceIndex = currentIndex();
+        QModelIndex targetIndex = indexAt(event->pos());
+
+        if (sourceIndex.isValid() && targetIndex.isValid()) {
+            QStandardItemModel *model = qobject_cast<QStandardItemModel *>(this->model());
+            if (model) {
+                QVariant sourceData = model->data(sourceIndex);
+                QVariant targetData = model->data(targetIndex);
+                model->setData(sourceIndex, targetData);
+                model->setData(targetIndex, sourceData);
+                event->ignore();
+            }
+        } else {
+			event->ignore();
+        }
+    }
+};
+
+
 #include "trainWindow.moc"
 
-CustomListView     *orderList;
+OrderListView     *orderList;
 
 QStandardItem *makeItem(std::string content, bool isCheckable) {
 	auto *item = new QStandardItem(); 
@@ -131,7 +163,7 @@ void initTrainWindow() {
 	auto listStyle = 
 			"QListView {"
 			"   background-color: white;"
-			"   border: 1px solid black;"
+			"   border: 0px solid black;"
 			"}"
 			"QListView::item::first {"
 			"   padding: 5px 0 0 0;"
@@ -178,7 +210,7 @@ void initTrainWindow() {
 
 	{ // Make order list.
 		orderModel = new QStandardItemModel();
-		orderList  = new CustomListView();
+		orderList  = new OrderListView();
 		orderList->setModel(orderModel);
 
 		orderList->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
@@ -234,10 +266,14 @@ void initTrainWindow() {
 	}
 
 	{ // Make group question view. 
-		auto wGroupQuestion = new QWidget();
+		wGroupQuestion = new QWidget();
+		wGroupQuestion->setStyleSheet(
+			"border:none;"
+		);
 		auto hGroupQuestion = new QHBoxLayout();
 		wGroupQuestion->setLayout(hGroupQuestion);
 
+		// Items on the left.
 		auto itemScroll = new QScrollArea();
 		auto vItems     = new QVBoxLayout();
 		itemScroll->setLayout(vItems);
@@ -245,22 +281,44 @@ void initTrainWindow() {
 		itemListView = new QListView();
 		itemListView->setModel(itemModel);
 		itemListView->setStyleSheet(listStyle);
-		for (int i = 0; i < 50; ++i) {
-			itemModel->appendRow(makeItem("Item I", false));
-		}
+		itemListView->setDragEnabled(true);
+		itemListView->setDragDropMode(QAbstractItemView::DragDrop);
+		itemListView->setDefaultDropAction(Qt::MoveAction);
 		vItems->addWidget(itemListView);
 		hGroupQuestion->addWidget(itemScroll);
 
+		// Items on the right.
 		auto wGroupBox   = new QWidget();
 		auto vGroupBox   = new QVBoxLayout();
-		auto groupScroll = new QScrollArea();
+		auto wGroups = new QScrollArea();
 		auto vGroups     = new QVBoxLayout();
+		auto groupSpacer = new QSpacerItem(50, 50, QSizePolicy::Minimum, QSizePolicy::Expanding);
+
 		wGroupBox->setLayout(vGroupBox);
-		vGroupBox->addWidget(groupScroll);
-		groupScroll->setLayout(vGroups);
+		wGroups->setLayout(vGroups);
 		hGroupQuestion->addWidget(wGroupBox);
+		vGroupBox->addWidget(wGroups);
+
+		{
+			auto groupLabel = new QLabel("Group I");
+			auto scrollArea = new QScrollArea();
+			auto groupModel = new QStandardItemModel();
+			auto groupList = new QListView();
+			groupList->setModel(groupModel);
+			groupList->setMaximumHeight(100);
+			vGroups->addWidget(groupLabel);
+			vGroups->addWidget(groupList);
+			groupList->setStyleSheet(listStyle);
+			groupList->setAcceptDrops(true);
+			groupList->setDragDropMode(QAbstractItemView::DragDrop);
+			groupList->setDefaultDropAction(Qt::MoveAction);
+		}
+		vGroups->addItem(groupSpacer);
+
+		std::cout << wGroupBox->geometry().height() << std::endl;
 
 		itemListView->setEditTriggers(QAbstractItemView::NoEditTriggers);
+		wGroupQuestion->hide();
 		questionBox->layout()->addWidget(wGroupQuestion);
 	}
 
@@ -277,6 +335,7 @@ void hideQuestionElements() {
 	answerText->hide();
 	orderList->hide();
 	listView->hide();
+	wGroupQuestion->hide();
 }
 
 void setupAnswerQuestion(MultiElementQuestion *question) {
@@ -362,7 +421,17 @@ void setupMultiChoiceQuestion(MultiElementQuestion *question) {
 void setupGroupQuestion(GroupQuestion *question) {
 	hideQuestionElements();
 
-	// TODO
+	lQuestionText->setText(
+		QString::fromStdString(question->QuestionText)
+	);
+	lQuestionText->show();
+
+	wGroupQuestion->show();
+	for (auto group: question->Groups) {
+		for (auto item: group.elements) {
+			itemModel->appendRow(makeItem(item, false));
+		}
+	}
 
 	auto showAnswer = [](bool checked) {
 		QObject::disconnect(btnTriggerAnswer, 0, 0, 0);