[Interest] DragDrop between different processes not working?

[Jason H]

It's been a while but I've dragged content out of browser (Firefox) into a Qt app. It works, at least back in Qt 4.x.

You have to enable DnD events. Your app won't respond to them otherwise.

> Sent: Wednesday, December 17, 2014 at 1:18 AM
> From: Wilhelm <wilhelm.meier at fh-kl.de>
> To: "interest at qt-project.org" <interest at qt-project.org>
> Subject: [Interest] DragDrop between different processes not working?
>
> Hi all,
> 
> below is a stripped-down example for drag/drop. It follows the Qt
> examples. It works if I drag from the ListView widget to another widget
> (e.g. QTextEdit) of the same(!) process. But it doesn't work if I drag
> to another(!) process - with the same programm or another, e.g. kate.
> 
> So, obviously I'm missing something to enable drag/drop between
> processes. But I can't figure out what - I think it must be very basic!
> 
> Can anyone help?
> 
> 
> void ListView::mouseMoveEvent(QMouseEvent* event)
> {
>     TRACE;
>     if (!(event->buttons() & Qt::LeftButton)) {
>         return;
>     }
>     if ((event->pos() - mMousePressPosition).manhattanLength() <
> QApplication::startDragDistance()) {
>         return;
>     }
>     QDrag* drag = new QDrag(this);
>     QMimeData* mimeData = new QMimeData;
> 
>     mimeData->setText(QString::fromLatin1("ABC"));
>     mimeData->setUrls(QList<QUrl>() << QUrl::fromLocalFile("./test.cc"));
> 
>     drag->setMimeData(mimeData);
> 
>     qDebug() << Q_FUNC_INFO << mimeData->text();
>     qDebug() << Q_FUNC_INFO << mimeData->urls();
> 
>     Qt::DropAction dropAction = drag->exec(Qt::CopyAction |
> Qt::MoveAction, Qt::CopyAction);
> 
>     qDebug() << Q_FUNC_INFO << "drop:" << dropAction;
> }
> 
> -- 
> Wilhelm
> w.meier at unix.net
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