[Qt-interest] Query related selection color in Qt

[Ramesh]

Yup,

Ya I agree with your words andre,

 

I would *expect* that method to manipulate the brush and pen for it's
drawing. It needs to! Why do you think you can modify it for your own
delegate, but don't want other delegates to do the same?

 

Anyway Thanks lot J. I am using the QAbstractItemModel data roles, to
perform the needful operation.

 

-Ramesh.

 





 

From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Andre Somers
Sent: Wednesday, June 23, 2010 7:04 PM
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] Query related selection color in Qt

 

On 23-6-2010 15:13, Ramesh wrote: 

Ya I do agree with that point,

But logically if we think, the control comes to customized paint method
here, painter is a pointer, we are going to modify and passing it to the
base class.

Where else painter value gets changed?


QStyledItemDelegate is the method to do the painting of a delegate just like
your own one. I would *expect* that method to manipulate the brush and pen
for it's drawing. It needs to! Why do you think you can modify it for your
own delegate, but don't want other delegates to do the same?

Still, probably the painter is not actually changed after the call. Chances
are (without reading the source) that the implementation uses
QPainter::save() and QPainter::restore(), so you will get back the painter
the way you left it. Not that that helps you...

Bottom line is, that you need to use another method. You can:
* do the drawing yourself in the delegate (look in QStyledItemDelegate for
inspiration on how to do that), or
* use the appropriate QAbstractItemModel data roles to set the colors you
prefer in your model or a proxy model.

Perhaps it is even possible to manipulate the style option passed to achieve
what you want, but I am not sure about that. 

André




 

 

From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Andre Somers
Sent: Wednesday, June 23, 2010 6:29 PM
To: qt-interest at trolltech.com
Subject: ***SPAM*** Re: [Qt-interest] Query related selection color in Qt

 

On 23-6-2010 14:43, Ramesh wrote: 

Hi,

I want to highlight the selected item text color in listview, for this I am
painting  the text in delegate method.

My problem is, if I set the pen to painter and draw the text manually it
works, but if the system draw text it doesn’t work 

May I know the reason why it happens like this?

 

Here is the sample code of delegate where my problem is occurring.

 

In this code, I am setting the pen color to painter and passing it to base
class to draw, still painter doest draw with the color which I set.

 

const bool sel((option.state & QStyle::State_Selected) ==
QStyle::State_Selected);

QBrush baseBrush(sel ? option.palette.highlight() : option.palette.base());

QBrush textBrush(sel ? option.palette.highlightedText() :
option.palette.text());

 

QColor color = textBrush.color();

painter->setPen(QColor(0,102,255));

QStyledItemDelegate::paint(painter,option,index); 

Probably, because QStyledItemDelegate::paint itself sets the color of the
pen before painting, based on the style, the palette and the style sheet, I
guess. 

André





-- 
Nokia Certified Qt Developer.
Interested in Qt related job offers or freelance Qt consulting work.

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