Qt keyPress/keyRelease notify work differently on Vista and Linux

nogains.nopains

I found that the keyPress event is never fired until the key is actually released on Linux . This behavior is different on vista.

The difference happens when I do the following sequence: 1) CTRL key down, 2) hold it for a while 3) release it.

On Linux, nothing is printed out till the release.i.e. you'll not see anything till 3), then you'see "notify::KeyPressed" and "notify::KeyReleased".

On Vista, after 1), you'll see "notify::KeyPressed", then in 2), you can detect that the CTRL is down with QApplication::keyboardModifier().testFlag(Qt::ControlModifier). then after 3), you'll see "notify::KeyReleased".

I think what happens on vista is what I expected. How can I fix the problem on Linux and why it happens this way?

Thanks for your help!

Here is a piece of code from my application:

@MyApplication::QApplication
{
bool notify(Object * receiver, QEvent * event) {
try{
if (event->type() == QEvent::KeyPress) {
std::cout<<"notify::KeyPressed"<<endl;
}

       if (event->type() == QEvent::KeyRelease) {
           std::cout<<"notify::KeyReleased"<<endl;
       }


        return QApplication::notify( receiver, event );
   }
   catch ( ... ) {
      std::cerr << "Unknown Exception caught: " << ends;

   }
   return false;

}

}@