Drawing pixmaps through delegates for qcombobox

Andaharoo

So I'm trying to add different images to each item of qcombobox by overriding paint functionality. From a hour or so of googling I found I need to subclass a delegate object, override it's paint function, and set that delegate to the combobox. That or use a qicon which didn't work either. I prefer this route though for later flexibility with painting.

So I use addItem("", MyPixmap) to give the image to the item then when paint is called in the delegate I do:

void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	QPixmap image = index.data().value<QPixmap>();
	painter->drawPixmap(0, 0, option.rect.width(), option.rect.height(), image);
}

I also tried:

void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	QPixmap image = index.data().value<QPixmap>();
	QApplication::style()->drawItemPixmap(painter, option.rect, 0, image);
}

Neither works just a blank area is displayed. I should say my image is 1x100 image whose height I would like to be stretched to fill the items container/rect. Any idea what I'm doing wrong?

mrjj

Hi
Try
QPixmap image = index.data().value<QPixmap>();
qDebug() <<"image ok" << image.isNull();

to check if it get a valid pixmap ?

Anyway,
the docs for addItem says the second parameter (MyPixmap)
is stored in Qt::UserRole
but you read with data with no role and default is
data(int role = Qt::DisplayRole) const

so i think you need at least to do
QPixmap image = index.data(Qt::UserRole).value<QPixmap>();
to get the pixmap again.