QVariant to QIcon/QPixmap/QImage

Question

I want to extract a QIcon I've stored in one of a QTreeWidget's columns, as Qt::DecorationRole.

QTreeWidgetItem *item = ui->treeWidget->topLevelItem(index);
const QIcon &icon = item->data(0, Qt::DecorationRole)._howToConvert_();

However, I can only get the data as QVariant, and I could not find a function to convert from a QVariant to QIcon. Is it possible to do it?

Answer 1

OK, found the answer in the docs for QVariant upon further inspection.

This works:

QImage image = variant.value<QImage>();

Answer 2

I find the solution as follows:

QImage name_image = table_store_multi_model_->item(i_row,0)->data(Qt::DecorationRole).value().toImage();

Generally, we read data with data(), but here need a parameter "Qt::DecorationRole";