i'm trying to move a QWidget which is inside of a QScrollArea but neither setGeometry() nor move() do work. here's a small example. what am i doing wrong here? qw always stays on the top left and doesn't move

Qt Code: 
  1. #include <QApplication>
  2. #include <QMainWindow>
  3. #include <QScrollArea>
  4.  
  5. int main( int argc, char **argv )
  6. {
  7.   QApplication a( argc, argv );
  8.  
  9.   QMainWindow *mw = new QMainWindow();
  10.  
  11.   QScrollArea *sa = new QScrollArea( mw );
  12.   sa->setPalette( QPalette( QColor(41,141,40) ) );
  13.  
  14.   QWidget *qw = new QWidget( sa );
  15.   qw->setPalette( QPalette( QColor(41,161,90) ) );
  16.   qw->resize(100,100);
  17.   qw->move(80,80);
  18.  
  19.   //qw->setGeometry(80,80,100,100);
  20.  
  21.   sa->setWidget(qw);
  22.  
  23.   mw->setCentralWidget( sa );
  24.   mw->show();
  25.  
  26.   return a.exec();
  27. }
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