Set QDrag mimeData

[Imhotep]

I have a class derived from QTableWidget, receiving drag'n'drop from external files and displays the name. The default action is Qt::CopyAction, and to ensure that the action to be performed is Qt::LinkAction, I must use drag->exec(Qt::LinkAction).



void tableWidget::dropEvent(QDropEvent *event) {
//…
QDrag *drag = new QDrag(this);
//…
}


Since
event->mimeData() returns data as const QMimeData and drag->setMimeData(data) accept argument as QMimeData, there is a way to overcome this problem?

[anda_skoa]

I have a class derived from QTableWidget, receiving drag'n'drop from external files and displays the name. The default action is Qt::CopyAction, and to ensure that the action to be performed is Qt::LinkAction, I must use drag->exec(Qt::LinkAction).

QDrag::exec() starts a new drag operation.
Are you sure you want to do that?

Your description sounds like you want the incoming drag to perform the LinkAction.
See QDropEvent::setDropAction() for doing that.

Cheers,
_

[Imhotep]

Tried this



void DTableWidget::dropEvent(QDropEvent *event) {
event->setDropAction(Qt::LinkAction);
event->accept();
//…
}


Still perform Qt::CopyAction

[anda_skoa]

Have you checked if the LinkAction is part of the QDropEvent::possibleActions() list?

It could very well be that the drag's source does not support that.

Cheers,
_

[Imhotep]

Seems to be



void DTableWidget::dropEvent(QDropEvent *event) {
qDebug() << event->possibleActions();
event->setDropAction(Qt::LinkAction);
event->accept();
//…
}


QFlags<Qt::DropAction>(CopyAction|MoveAction|LinkAction)