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how to color a cell in a QTableView

Jean__

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1

Thursday, January 10th 2008, 12:35pm

how to color a cell in a QTableView

How can I color a cell in a QTableView?
For instance if the cell holds a '1' I want it blue, else leave it white.

I know I have to override QPaintEvent, but how? I have a pointer to the QTableView that was created in Designer, it's called 'table'. :)

Now what to do?

table->paintEvent = somefuntion(QPaintEvent*)

and where should that function go?

I'm totally unclear about this and searches have not shown much in the way of a clear example.
Thanks.

This post has been edited 1 times, last edit by "Jean__" (Jan 10th 2008, 12:36pm)

flowerJT

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Thursday, January 10th 2008, 7:18pm

You can not do it the way you were suggesting it. Designer already made an instance of QTableView for you. But anyway, I don't think this is the right place at all. You have to subclass QAbstractItemDelegate in order to provide custom appearance - at least I think so ;)

Take a look at
QAbstractItemDelegate * QAbstractItemView::itemDelegate ( const QModelIndex & index ) const and
QAbstractItemDelegate.

Hope this helps.

PS: Sometimes you have to subclass a standard class as you mentioned and you want to use your class in designer. Than drag the base class into your form and right click on it. There's a menu entry called something like "Promote to custom widget...". Now you can enter class name, path, etc. Designer will create the ui-file accordingly.

Best regards

This post has been edited 2 times, last edit by "flowerJT" (Jan 10th 2008, 7:39pm)

Jean__

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Friday, January 11th 2008, 6:22pm

he thanks,

Well that class certainly looks interesting. Now if there were some examples as how to use it, that would be fine. Prblem with this is, a lot of people want to know how to do this but no-one seems to have much luck. Me I'm at the moment a bit weary of spitting through endless classes and members witout much of working examples.

The other technique you mentioned is interesting, gonna have a closer look.

Thanks.

Jean__

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4

Sunday, January 13th 2008, 12:01pm

Solved

Got it working
For those interested my code:

in the .h file add:

Source code

 
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class Delegate : public QItemDelegate
 {
 Q_OBJECT
 public:
 Delegate(QWidget *parent = 0) : QItemDelegate(parent) {}
 void paint(QPainter *painter, const QStyleOptionViewItem &option,
                const QModelIndex &index) const;
 };


in the .cpp, in a constructor

Source code

 
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table->setItemDelegate(new Delegate);


and the event:

Source code

 
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//---------------------------------------------------
void Delegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                          const QModelIndex &index) const
{
QString val;
if (qVariantCanConvert<QString>(index.data()))
    val = qVariantValue<QString>(index.data());
if (val == "1")
	{
  painter->fillRect(option.rect, option.palette.highlight());
	}
else
  QItemDelegate::paint(painter, option, index);
}