@raven-worx said in QTreeView drag/drop "icon" Transparency:

@Dariusz
the only way currenlty is to start the drag entirely yourself by overwriting QAbstractItemView::startDrag()
Its not that hard. Simply get the data for all selected indexes from the model and set a custom drag pixmap and call QDrag::exec()

Hey

Id love to do it but sadly it does not work. For example >

def startDrag(self, supportedActions): d = QDrag(self) data = self.model().mimeData(self.selectedIndexes()) d.setMimeData(data) d.exec_(supportedActions)

It Will, not produce the same effect as native action. Simply because when you look at source code where >

if (drag->exec(supportedActions, defaultDropAction) == Qt::MoveAction) d->clearOrRemove();

Which handles the items state after their drag.
I can not reproduce the action without a large rewrite of the startDrag event I'm afraid.

I wish that the function that they use for Pixmap generation >

QPixmap pixmap = d->renderToPixmap(indexes, &rect); rect.adjust(horizontalOffset(), verticalOffset(), 0, 0); QDrag *drag = new QDrag(this); drag->setPixmap(pixmap);

Would be a virtual function so that I can overwrite it and provide my own pixmap at that level without messing up entire drag Qt logic.

@jpnurmi Thanks for the clarification!

That's not how it works and not something I would expect either.

The mdi sub-windows will only extend in the mdi area, nothing more.

The behavior you are looking for, you'll have to implement yourself.

Hi and welcome

Maybe
void QDrag::setPixmap(const QPixmap & pixmap)
Could be used ?
You set it when you start the drag so it sounds it might do what you want.