/*
  When the window is hidden, the funciton can not show the window properly.
  If we just call the function show(),it will show properly in any window
  state. So we should do some change to this function
*/
void QtSingleApplication::activateWindow()
{
    if (actWin) {
     // actWin->setWindowState(actWin->windowState() & ~Qt::WindowMinimized);
     //  actWin->raise();
     //  actWin->activateWindow();
         actWin->show();
    }
}