diff -r 68988ebc2a68 -r 593a658cba8e src/mainwindow.h
--- a/src/mainwindow.h	Mon Sep 23 14:06:36 2019 +0300
+++ b/src/mainwindow.h	Thu Oct 03 11:45:44 2019 +0300
@@ -2,6 +2,7 @@
 #include <QMainWindow>
 #include <memory>
 #include <vector>
+#include "documentmanager.h"
 
 class MainWindow : public QMainWindow
 {
@@ -9,6 +10,15 @@
 public:
 	MainWindow(QWidget *parent = nullptr);
 	~MainWindow();
+private slots:
+	void newModel();
+	void openModel();
 private:
 	std::unique_ptr<class Ui_MainWindow> ui;
+	DocumentManager documents;
+	QMap<Model*, QWidget*> modelWidgets;
+	QWidget* createWidgetForModel(Model* model);
+	QWidget* getWidgetForModel(Model* model);
+	void updateTabs();
+	void updateTitle();
 };