Question

I am using the following code to switch between full screen and maximized window,

void MainWindow::keyPressEvent(QKeyEvent *e)
{
  if ((e->key()==Qt::Key_Enter) && (e->modifiers()==Qt::AltModifier))
       this->setWindowState(Qt::WindowFullScreen);
  if (e->key()==Qt::Key_Escape)
      if(isFullScreen())
        this->setWindowState(Qt::WindowMaximized);
}

but this doesn’t work.Can anybudy tell me what’s the problem here??

Answer 1

You shouldn’t use:

e->modifiers()==Qt::AltModifier

to check key modifiers because the modifiers() function returns flags.
Use something like:

e->modifiers()&Qt::AltModifier

or

(e->modifiers()&Qt::AltModifier)==Qt::AltModifier