Trivial re-implementation of QCoreApplication::notify entails infinite loop

[wysota]

Of what avail is it to install an event filter for the application object?

You would intercept every event that happens in your application before it reaches its destination.

[guenthk]

Now I have tested the event filter method for the application object, the QSplitter and the QSplitter children. Result: Not a single event has been caught by the event filter, except for two child events from an object for that I had not installed an event filter.

Now I'll test whether the same happens on Linux.

[wysota]

Can we see the code?

[guenthk]

You mean the event filter installation?:

MyMainFrame::MyMainFrame() : QMainWindow() {
...
  myApp->installEventFilter(this);
...
}
 
bool MyMainFrame::eventFilter(QObject *o, QEvent *e) {
  return false;
}

MyMainFrame::MyMainFrame() : QMainWindow() {
...
  myApp->installEventFilter(this);
...
}

bool MyMainFrame::eventFilter(QObject *o, QEvent *e) {
  return false;
}

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The eventFilter function is never called except in those two cases where I hadn't installed an event filter for o. Rather strange! The same happens in SuSE-Linux 10.3/Qt4.3.3.

I am now about to install Qt4.3.4 on Vista, hoping that the problem will disappear in some wondrous way then.

[guenthk]

After I have installed Qt4.3.4 and rebuilt our whole application, the reimplementation of QCoreApplication::notify now works without problems on Vista.