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Qt-interest Archive, May 2008
Drag 'n Drop into a QGraphicsView

Message 1 in thread

Hi,

Any reason why a QGraphicsView won't accept drops _after_ one has set a scene 
for that particular view? Before I set a scene to that view it accepts drops 
just fine, but afterwards it's a no-go. Any ideas?

This guy's second question seems to be related:
http://lists.trolltech.com/qt4-preview-feedback/2006-09/thread00081-0.html

Any help is appreciated.

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Message 2 in thread

Christopher Rasch-Olsen Raa wrote:
> Hi,
> Any reason why a QGraphicsView won't accept drops _after_ one has set a
> scene for that particular view? Before I set a scene to that view it
> accepts drops just fine, but afterwards it's a no-go. Any ideas?
> This guy's second question seems to be related:
> http://lists.trolltech.com/qt4-preview-feedback/2006-09/thread00081-0.html
> Any help is appreciated.

Hi, Christopher. Could you please send some code that shows what you mean?
QGraphicsView is built to forward DnD to the scene if one is set. If the
scene doesn't accept the events, though, they should propagate to the view.

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Message 3 in thread

På Fredag 02 mai 2008 , 08:18:32 skrev Andreas Aardal Hanssen:
> Christopher Rasch-Olsen Raa wrote:
> > Hi,
> > Any reason why a QGraphicsView won't accept drops _after_ one has set a
> > scene for that particular view? Before I set a scene to that view it
> > accepts drops just fine, but afterwards it's a no-go. Any ideas?
> > This guy's second question seems to be related:
> > http://lists.trolltech.com/qt4-preview-feedback/2006-09/thread00081-0.htm
> >l Any help is appreciated.
>
> Hi, Christopher. Could you please send some code that shows what you mean?
> QGraphicsView is built to forward DnD to the scene if one is set. If the
> scene doesn't accept the events, though, they should propagate to the view.


Hi again,

Yeah, I figure it is built to forward DnD-events and I guess I'm doing 
something wrong here, though I can't see what that is.

Here is an example showing what I mean:

#include <QtGui>

class MyView : public QGraphicsView {
        public:
                MyView(QWidget *parent = 0);
        protected:
                void dragEnterEvent(QDragEnterEvent *event);
                void dropEvent(QDropEvent *event);
};

MyView::MyView(QWidget *parent) : QGraphicsView(parent) {
        setAcceptDrops(true);
	// Comment the line below, and drop starts working
        setScene(new QGraphicsScene(this));
}

void MyView::dragEnterEvent(QDragEnterEvent *event) {
        event->accept();
        qDebug() << "Enter";
}

void MyView::dropEvent(QDropEvent *event) {
        qDebug() << event->mimeData()->formats();
}

int main(int argc, char *argv[]) {
        QApplication app(argc, argv);

        QMainWindow mainwindow;
        MyView view;
        mainwindow.setCentralWidget(&view);
        mainwindow.show();

        return app.exec();
}

I've been staring myself blind, so any help is appreciated.

Best,
Christopher

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Message 4 in thread

På Søndag 04 mai 2008 , 13:44:17 skrev Christopher Rasch-Olsen Raa:
[snip]
>
> I've been staring myself blind, so any help is appreciated.
>
> Best,
> Christopher
>
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Ok, so now I'm just about ready to shoot myself with bent spoons. Implementing 
QGrpahicsView::dragMoveEvent() solved it.

Yet another PEBKAC.

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