[Qt-interest] custom shaped buttons

[Pritam]

On Tuesday 07 February 2012 09:48 PM, Carlos Smith wrote:
> Thanks,  maybe I am missing something,  but the problem I had is that I cannot find the corresponding palette entry for the pressed color I set in the style sheet.
>
> I had debug code that dumped the RGB's for every color in the QPalette::ColorRole enumeration, like this:
>
>                  QStyleOptionButton opt;
>                  initStyleOption(&opt);
>                  QPalette palette = opt.palette;
>
>                  QBrush tempBrush;
>
>                  tempBrush = palette.color(QPalette::Active, QPalette::Window);
>                  qDebug()<<  "Window color"<<  tempBrush.color().red()<<  tempBrush.color().green()<<   tempBrush.color().blue();
>                  tempBrush = palette.color(QPalette::Active, QPalette::WindowText);
>                  qDebug()<<  "WindowText color"<<  tempBrush.color().red()<<  tempBrush.color().green()<<   tempBrush.color().blue();
>
> And none of the colors was the one I had set for the "pressed" state.  Though the same stylesheet declaration worked for standard QPushbuttons.  If I recall I traced all the way down and they (Qt) had the color somehow, but I couldn't get it from the application level.
>
> I would have expected the opt.palette to have been loaded with the colors corresponding to the current (pressed) state.  I know of no other palette to use.   For that matter, the bevel draws correctly with the "pressed" state background color, but I can't get the foreground/text/window color to use to draw my custom text.  Hence I use a custom property in the style sheet to get the functionality I want, which is a real kludge.
Using stylesheet and doing your own paiting, is a tricky thing in qt. 
The biggest reason being QStyleSheetStyle is not public. This is the 
function which qt widgets use to get stylesheet palette.

<code>
// Polish palette that should be used for a particular widget, with 
particular states
// (eg. :focus, :hover, ...)
// this is called by widgets that paint themself in their paint event
// Returns true if there is a new palette in pal.
bool QStyleSheetStyle::styleSheetPalette(const QWidget* w, const 
QStyleOption* opt, QPalette* pal)
</code>

Have a look at qstylesheetstyle.cpp and qlineedit.cpp's paintevent. A 
temporary solution could be you introduce one more color Q_PROPERTY in 
your widget and set that as well from stylesheet using 
"qproperty-<propertyname>" syntax. Sorry I don't have a clean solution 
for your problem.
>
> Thanks,
> Carlos
>
> -----Original Message-----
> From: qt-interest-bounces+csmith=stonewedge.net at qt.nokia.com [mailto:qt-interest-bounces+csmith=stonewedge.net at qt.nokia.com] On Behalf Of Ross Bencina
> Sent: Tuesday, February 07, 2012 4:43 AM
> To: qt-interest at qt.nokia.com
> Subject: Re: [Qt-interest] **JUNK** Re: custom shaped buttons
>
>
> On 7/02/2012 4:46 PM, Tibo W wrote:
>   >  QStyleOptionButton opt;
>   >  initStyleOption(&opt);
> [snip]
>   >  Unfortunately, there doesn't seem to be any way to extract the style for>  the button "pressed" state from the palette, it simply doesn't seem to>  be there, though it is magically available in Qt's own pushbutton>  renderer.
>
> I'm pretty sure you'll find it in the style option "state" field.
> According to the docs for QStyle::State the QStyle::State_Sunken bit should be set.
>
> http://developer.qt.nokia.com/doc/qt-4.8/qstyle.html#StateFlag-enum
>
> if( opt.state&  QStyle::State_Sunken )
>       ... button is pressed ...
>
> Ross.
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-- 
Regards,
Pritam


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