Перенес формирование Item ов в отдельный поток

InstructorsAndTrainees/tasks/tasktreepreparation.h

@@ -0,0 +1,27 @@
+#ifndef TASKTREEPREPARATION_H
+#define TASKTREEPREPARATION_H
+
+#include <QObject>
+#include <QTreeWidgetItem>
+#include "module.h"
+
+class TaskTreePreparation : public QObject
+{
+    Q_OBJECT
+public:
+    explicit TaskTreePreparation(QObject *parent = nullptr);
+
+public:
+    QTreeWidgetItem* addModuleToTreeWidget(Module* module, QTreeWidgetItem* parentItem = nullptr);
+
+public Q_SLOTS:
+    void slot_prepareListItems(QList<Module*> listAllModules);
+
+Q_SIGNALS:
+    void signal_listItemsReady(QList<QTreeWidgetItem*> listItems);
+
+private:
+    QList<QTreeWidgetItem*> listItems;
+};
+
+#endif // TASKTREEPREPARATION_H