qt可缩放窗口

 #ifndef MAINWINDOW_H

    
 #define MAINWINDOW_H
    
  
    
 #include <QMainWindow>
    
 #include <QPushButton>
    
 #include <QFrame>
    
 #include <QSplitter>
    
 #include <QMouseEvent>
    
 #include <QTableWidget>
    
 namespace Ui {
    
 class MainWindow;
    
 }
    
  
    
 class MainWindow : public QMainWindow
    
 {
    
     Q_OBJECT
    
  
    
 public:
    
     explicit MainWindow(QWidget *parent = 0);
    
     ~MainWindow();
    
     void setBtnPos();
    
     void setBtnIcon();
    
  
    
  
    
 private:
    
     Ui::MainWindow *ui;
    
     //QPu