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List:       kde-devel
Subject:    Re: Widget Focus
From:       Milian Wolff <mail () milianw ! de>
Date:       2011-06-23 9:34:15
Message-ID: 201106231134.15561.mail () milianw ! de
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Steven Sroka, 23.06.2011:
> >On 22 June 2011 03:29, Kevin Funk <krf@gmx.de> wrote:
> > Wednesday 22 June 2011, Steven Sroka <sroka.steven@gmail.com>:
> >> Is there any way to set focus to manually a widget when a window opens?
> >> I used QRadioButton::setFocus(Qt::ActiveWindowFocusReason), but it
> >> doesn't help, the first widget placed on the window always has focus.
> 
> Thank you everyone. I simply added QRadioButton::setFocus() at the end
> of the block of code.
> 
> You would know this better than me, is
> QTimer::singleShot/QMetaObject::invokeMethod preferable in this
> scenario?

Uhm, as it seems to work without the eventloop, everything is fine?

> I don't think it is guaranteed that each line of code is run after the
> previous line is successfully completed, therefore I might need to
> ensure the program only calls QRadioButton::setFocus() after the
> widgets are created and placed.

That is not really true. Well, sure - if you call a function that creates a 
thread or delegates work to the eventloop than you could argue that the 
"previous line is *not* successfully completed". But this would be a corner 
case and is generally not the case. Just assume that everything is done after 
you called a function.

> Would the event loop help in this scenario? Then again it is probably
> overkill, but it is an interesting situation.



> > Hey,
> > 
> > Do you call setFocus *after* creating/layouting the widgets? Constructing
> > other widgets afterwards will change the keyboard focus, so be sure to
> > make this call last.
> > 
> > Other than, it might help to use the event loop for calling the
> > setFocus() slot on a widget, e.g.:
> > QTimer::singleShot(0, widget, SLOT(setFocus()));
> > 
> > This ensures that the widget(s) is/are fully constructed before receiving
> > the focus activation.
> > 
> > Hope this helps,
> > 
> > Greets
> > 
> > --
> > Kevin Funk
> > 
> >> Visit http://mail.kde.org/mailman/listinfo/kde-devel#unsub to
> >> unsubscribe <<


-- 
Milian Wolff
mail@milianw.de
http://milianw.de

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