diff --git a/mainwindow.h b/mainwindow.h
new file mode 100644
index 0000000000000000000000000000000000000000..7e825bf2554f64b86a204f3353292c39cfeb8011
--- /dev/null
+++ b/mainwindow.h
@@ -0,0 +1,49 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QGridLayout>
+#include <QMenuBar>
+#include <QTreeWidget>
+#include <QFileDialog>
+#include <QFile>
+#include <QXmlSimpleReader>
+#include <QTextEdit>
+#include <QDockWidget>
+#include <QTableView>
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class MainWindow; }
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+private slots:
+    void open_file();
+    void clean_tree();
+    void close_window();
+    void make_query();
+    void open_query();
+    void make_active();
+    void close_file();
+    void slot_custom_menu(const QPoint&);
+
+private:
+    Ui::MainWindow *ui;
+    QTreeWidget* tree_widget;
+    QWidget* main_widget;
+    QTextEdit* text_edit;
+    QTextEdit* text_edit_dock;
+    QDockWidget* dock;
+    QGridLayout *main_layout;
+    QMenu* menu_custom;
+    QFile* current_file;
+    QTreeWidgetItem* current_pos;
+};
+#endif // MAINWINDOW_H
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