[Qt-interest] System-wide shortcut (hotkey)

[Matt Rogers]

On Tuesday 13 January 2009 01:20:45 Anthony Serdyukov wrote:
> Thanks, I'm looking at QAbstractEventDispatcher too, and that is why.
>
> In the documentation for QCoreApplication::winEventFilter I have found
> the following:
>
> <cite>
> It is only directly addressed messages that are filtered. To handle
> system wide messages, such as messages from a registered hot key, you
> need to install an event filter on the event dispatcher, which is
> returned from QAbstractEventDispatcher::instance().
> </cite>
>
> So, what kind of hot keys are mentioned here... don't know. And how to
> register it properly?
>

First, don't top post, especially to mailing lists and newsgroups. Makes 
following a thread nearly impossible (and it's bad netiquette to boot).

So, installing an event filter on the event dispatcher is as simple as the 
following snippet:

QAbstractEventDIspatcher* ed = QAbstractEventDispatcher::instance();
QAbstractEventDispatcher::EventFilter ef = &eventFilterFunction;
ed->setEventFilter(ef);

eventFilterFunction is implemented by you to catch the events you want at the 
system level. 

Hope this helps,
Matt

> 2009/1/13 R. Reucher <rene.reucher at batcom-it.net>:
> > On Tue January 13 2009 06:48:15 Anthony Serdyukov wrote:
> >> Good day.
> >>
> >> I need to set system-wide hotkey and perform some action when it is
> >> fired. The only one discussion I have found is here:
> >> http://lists.trolltech.com/qt-interest/2007-07/thread00221-0.html
> >> But unfortunately, there is no solution there.
> >>
> >> Qt 4.4.3, platform is Windows.
> >
> > As far as I can tell, QAction doesn't support that natively - the
> > highest "level" of the shortcut context is on application level.
> >
> > The only solution I can think of is to use QAbstractEventDispatcher and
> > install an event filter function that does the job... but I've never
> > tried it, so I can't tell if what you are aiming to achieve is really
> > possible this way.
> >
> > There may also be platform dependent ways, of course...
> >
> > HTH, René
> > --
> > René Reucher
> > rene.reucher at batcom-it.net
> > http://www.batcom-it.net/
> >
> > "Biology is the only science in which multiplication means the same
> > thing as division."
> >
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at trolltech.com
> > http://lists.trolltech.com/mailman/listinfo/qt-interest

-- 
Matt
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