diff --git a/mainwindow.h b/mainwindow.h
new file mode 100644
index 0000000000000000000000000000000000000000..ecdd8ec33562dcf8e9f67d7621f6a223ffeeb6f5
--- /dev/null
+++ b/mainwindow.h
@@ -0,0 +1,126 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include"dialog.h"
+#include"highlighter.h"
+#include"linenumberarea.h"
+#include <QMainWindow>
+#include<QMenu>
+#include<QAction>
+#include<QMenuBar>
+#include<QFileDialog>
+#include<QTabWidget>
+#include<QDir>
+#include<QString>
+#include<QVector>
+#include<QDebug>
+#include<QFileDialog>
+#include<QFile>
+#include<QTextStream>
+#include<QFileInfo>
+#include<QMessageBox>
+#include<QPushButton>
+#include<QDir>
+#include<QDialog>
+#include<QDockWidget>
+#include<QTreeView>
+#include<QFileSystemModel>
+#include<QListView>
+#include<QStringListModel>
+#include<QStringList>
+#include<QErrorMessage>
+#include<QWidgetItem>
+#include<QToolBar>
+#include<QIcon>
+#include <QPlainTextEdit>
+#include<QPainter>
+#include<QTextBlock>
+#include<QCloseEvent>
+#include<QXmlStreamReader>
+#include<QXmlAttributes>
+#include <QXmlStreamAttribute>
+#include <QXmlStreamAttributes>
+#include<QRegularExpression>
+
+
+struct HighlightingRule;
+
+
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class MainWindow; }
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+        friend class Dialog;
+
+protected:
+
+   static size_t newFileName;
+
+   QFileSystemModel  fileSystem ;
+
+   QStringList fileNames;
+
+   QStringListModel strList;
+
+   QVector<QDir> fileDirs;
+
+   QToolBar * bar;
+
+   void loadFileData(const QString &);
+
+  QVector<HighlightingRule> loadXmlFile(const QString &);
+
+  void removeTab();
+
+  QVector<bool> isExistDoc;
+
+  QVector<bool> isChangedDoc;
+
+
+public:
+     MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+private:
+    Ui::MainWindow *ui;
+
+
+private slots:
+
+  void on_newAct_triggered();
+  bool on_closeAct_triggered();
+  void on_closeAllAct_triggered();
+  void on_openAct_triggered();
+  bool on_exitAct_triggered();
+  void on_saveAct_triggered();
+  void on_saveAsAct_triggered();
+  void on_saveAllAct_triggered();
+
+  void on_fileTreeDock_visibilityChanged(bool visible);
+  void on_activeFilesDock_visibilityChanged(bool visible);
+  void on_listView_clicked(const QModelIndex &index);
+ // void on_treeView_clicked(const QModelIndex &index);
+
+  void on_activeFilesAct(bool visible);
+  void on_fileTreeAct(bool visible);
+
+  void on_cutAct_triggered();
+  void on_copyAct_triggered();
+  void on_insertAct_triggered();
+  void on_deleteAct_triggered();
+  void on_highlightAct_triggered();
+
+  void tabModification();
+
+  void on_tabWidget_tabCloseRequested(int index);
+  void on_treeView_doubleClicked(const QModelIndex &index);
+
+  void closeEvent(QCloseEvent * closeEvent) override;
+
+};
+#endif // MAINWINDOW_H