QStyledItemDelegate: getting QModelIndex::data value by Qt::UserRole in paint() method [Invalid]

[janfaroe]

Hi all,

I have a subclassed QStyledItemDelegate class where I do some extra painting jobs. I'm setting the delegate on a QTreeWidget, to which I am of course adding QTreeWidgetItems to. I had no problems getting the text of the item by index.data(Qt::DisplayRole). However, wanting to be a bit more fancy, I'm adding more data to each QTreeWidgetItem with QTreeWidgetItem::setData(column, Qt::UserRole, someValue).

How do I get those values in my QStyledItemDelegate:: paint method? I tried with QModelIndex(Qt::UserRole).toInt() (after checking if I'm at the right rolumn), but I'm not getting the values I'm expecting. I am probably doing something wrong here, but what?

[DBoosalis]

What getting a handle to the item itself, something like this:

MyItem::paint(QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QStandardItemModel *model = (QStandardItemModel *) index.model();
QStandardItem *item = model->itemFromIndex(index);
QVariant v = item->data( Qt::DecorationRole ); // or UserRole in your case
..
}

Hope this is of some value to you

[janfaroe]

No, just an int value set via QTreeWidgetItem::setData.

Sorry, seems like it was my own mistake. I was manipulating data other were, and that tricked me into believing my method of fetching data was wrong.

Ignore me, please.