[PyQt] Bug in setEventFilter?

Phil Thompson phil at riverbankcomputing.com
Sat Mar 19 10:05:31 GMT 2011

On Fri, 18 Mar 2011 21:44:06 -0400, "Brett Stottlemyer"
<brett at stottlemyer.com> wrote:
> I'm trying to process WM_INPUT in an application.  I know that in Qt you
> need to use QAbstractEventDispatcher and setEventFilter to get the
> messages.
> However, when I try to use setEventFilter, I get an Attribute error,
> 'QAbstractEventDispatcher' object has no attribute 'setEventFilter'.
> An example script is pretty simple and should allow the error to be
> reproduced:
> import sys
> from PyQt4.QtCore import *
> from PyQt4.QtGui import *
> def myEventFilter(message):
>     print message.message
>     return True, id(message)
> class QApp(QApplication):
>     def __init__(self, *args):
>         super(QApp, self).__init__(*args)
> if __name__ == '__main__':
>     app = QApp(sys.argv)
>     widget = QPushButton("Push me")
>     widget.show()
>     sys.exit(app.exec_())
> This is with Python 2.7 and PyQt 4.8.3 on a Win7 box.
> Any suggestions?

It's not implemented because the message itself is platform specific and
not part of Qt. That said there is partial support for XEvent to allow you
use the struct module to unpack it, so I could do something similar for
NSEvent (MSG is already supported). That would probably be enough to make
setEventFilter() useful.

...watch this space.


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