saving window positioning

mainwindow.h

@@ -18,10 +18,9 @@ class MainWindow : public QMainWindow
 
 public:
     explicit MainWindow(QWidget *parent = nullptr);
-    ~MainWindow();
+    ~MainWindow() override;
 
     void setPowerState();
-    
     void updateAVState();
 
 private slots:
@@ -41,7 +40,7 @@ private:
     Ui::MainWindow *ui;
 
     QString mAddress;
-    QSettings mSettings;
+    QSettings* mSettings;
     QTimer mTimerValCollect;
     QTimer mTimerUpdateState;
     QTimer mTimerUpdateAddress;
@@ -58,6 +57,10 @@ private:
     void updateUi();
     void setActiveButton(QString prop);
     void sendVolume();
+
+    // QWidget interface
+protected:
+    void moveEvent(QMoveEvent *) override;
 };
 
 }