Qt-interest Archive, June 2007
how to change the appearance of disabled widgets
Message 1 in thread
Hello,
in my program I need the disabled widgets to look like if they where
enabled. For this I create QPallete and overwrite all the "not obsolete
central roles" (http://doc.trolltech.com/4.2/qpalette.html):
QPalette palette;
palette.setColor( QPalette::Disabled, QPalette::Window,
QApplication::palette().color(QPalette::Active, QPalette::Window));
...
this->setPallete(pallete)
For QLineEdits it works fine, i.e. they are disabled and look like the usual
enabled lineedits. But for the other widgets I need (QSlider, QRadioButton,
QCheckBox) this method doesn't work - they look pretty disabled. So I
guess, I'm missing something else. What else do I have to do in order to
get the needed appearance for the disabled widgets?
Thanks in advance.
Alexander Semke.
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Message 2 in thread
Any particular style that you see this? I've been able to adjust the
disabled color using the method you describe for pushbuttons. The other
choice you have is to derive your own style and do the painting there.
Alexander Semke wrote:
> Hello,
>
> in my program I need the disabled widgets to look like if they where
> enabled. For this I create QPallete and overwrite all the "not obsolete
> central roles" (http://doc.trolltech.com/4.2/qpalette.html):
> QPalette palette;
> palette.setColor( QPalette::Disabled, QPalette::Window,
> QApplication::palette().color(QPalette::Active, QPalette::Window));
> ...
> this->setPallete(pallete)
>
> For QLineEdits it works fine, i.e. they are disabled and look like the usual
> enabled lineedits. But for the other widgets I need (QSlider, QRadioButton,
> QCheckBox) this method doesn't work - they look pretty disabled. So I
> guess, I'm missing something else. What else do I have to do in order to
> get the needed appearance for the disabled widgets?
>
> Thanks in advance.
>
> Alexander Semke.
>
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>
>
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Message 3 in thread
Susan Macchia wrote:
> Any particular style that you see this?
Yes, it's motif. For plastik setting the color roles does the job.
I'v just tried it for windows-style. Sliders look like enabled, but not the
checkbox and radiobuttons. So it seems to be very style dependent. Thank
you for this hint.
> I've been able to adjust the
> disabled color using the method you describe for pushbuttons. The other
> choice you have is to derive your own style and do the painting there.
The software runs on different platforms. In this case I'd need to adjust
this to different styles.
I've also tried to solve my problem by installing an EventFilter and to
throw away all unneeded key*-events and mouse*-events. But somehow I
couldn't manage to write the proper code at the first go (events were
forwarded to the children) and I decided to work with the color roles. May
be I shall look once more at the eventfilter-method...
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Message 4 in thread
Alexander Semke wrote:
> The software runs on different platforms. In this case I'd need to adjust
> this to different styles.
>
Yes, you'd have to derive multiple styles to do the same painting for
each style with issues. Probably Windows & Motif, since Plastique works.
> I've also tried to solve my problem by installing an EventFilter and to
> throw away all unneeded key*-events and mouse*-events. But somehow I
> couldn't manage to write the proper code at the first go (events were
> forwarded to the children) and I decided to work with the color roles. May
> be I shall look once more at the eventfilter-method...
>
This would certainly work and might get you by in the short term. But I
think the recommended approach is to implement it in the styles.
However having said all of that, it seems to me that this is a bug in
those styles that don't honor the palette settings. I'd submit these as
bugs, or at least ask TT.
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Message 5 in thread
Alexander Semke wrote:
> I've also tried to solve my problem by installing an EventFilter and to
> throw away all unneeded key*-events and mouse*-events. But somehow I
> couldn't manage to write the proper code at the first go (events were
> forwarded to the children) and I decided to work with the color roles. May
> be I shall look once more at the eventfilter-method...
>
Also look into the possibility of writing a style proxy
(http://doc.trolltech.com/qq/qq09-q-and-a.html#style). Create a style
proxy that just creates a copy of the style option and sets
State_Enabled. Something like,
MyStyle::drawComplexControl(cc, opt, p, w)
{
case CC_Slider: // for the slider
if (const QStyleOptionSlider *slider = qstyleoption_cast<const
QStyleOptionSlider *>(opt)) {
QStyleOptionSlider sliderCopy(*slider);
slider.state |= State_Enabled;
baseStyle->drawComplexControl(cc, &slider, p, w);
}
}
The big plus with this approach is you do not have to change the palette
(and also takes care of styles that ignore the palette).
Girish
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Message 6 in thread
Girish Ramakrishnan wrote:
> Also look into the possibility of writing a style proxy
> (http://doc.trolltech.com/qq/qq09-q-and-a.html#style).
>[...]
Ok, I'll look at this. Thank you.
> The big plus with this approach is you do not have to change the palette
> (and also takes care of styles that ignore the palette).
Well, I need only 10 lines of code or so to change the palettes. If it just
would work...
Alexander Semke.
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