function dropEvent(QGraphicsSceneDragDropEvent *event) doesn't work...

[Mariusz_1990]

Hi All
I have problem with function dropEvent(QGraphicsSceneDragDropEvent *event) when I wanna drop object type QGraphicsItem.
this is my part code

QPixmap dwuMasztowiec;
dwuMasztowiec = QPixmap("../Statki/images/dwu.png");
statek_1 = scene->addPixmap(dwuMasztowiec);
statek_1->setPos(277,405);
statek_1->setFlag(QGraphicsItem::ItemIsMovable);

I have several objects type statek (statek=ship). I wanna drag this ships somewhere in another place that I can drop and read position this ship.

I set flag (QGraphicsItem::ItemIsMovable) so I can drag elements but I haven't ideas how drop and read postion ship.

I used function (which is below) from example robot from Qt but doesn't work


void Plansza::dropEvent(QGraphicsSceneDragDropEvent *event)
{
if (event->mimeData()->hasImage()) {
dragOver = false;
pixmap = qVariantValue<QPixmap>(event->mimeData()->imageData());
update();
} else {
Plansza::dropEvent(event);
}
}

If I explained wrong my example , I will tell and show more details.

I please about support
Thanks

[anda_skoa]

Drop is something you drag in from outside the view. What you seem to want is repositioning items per mouse.
That should already be possible with the Movable flag. Or do you want to drag an item from one view to another?

Cheers,
_

[Mariusz_1990]

Exactly I do game in ships and I wanna drag ships on Scene.The drag elements work properly because I added flag (QGraphicsItem::ItemIsMovable). I wanna write function (dropEvent) where I will implement:
- read postion ships
- align ships to the grid
My problem is it that I can't capture event "drop".
I think that now I explained a little more about my problem

[anda_skoa]

Have you enabled drop support on the view? I.e. called setAcceptDrops(true)?

Can you see other drops, e.g. a file list from the file manager?

Btw, you have an infinite recursion in your code, you are calling the method again in the else branch.

See also http://qt-project.org/doc/qt-4.8/gra...droprobot.html

Cheers,
_

[Mariusz_1990]

Yes I enabled drop support by function setAcceptDrops(true).
I saw example with Robot earlier but I don't understand a little this example...
if I have wrote function dropEvent it I must have also function dragEvent ? or only need to have set flag (QGraphicsItem::ItemIsMovable) ?
Maybe someone has another example similar to Robot but that elements graphics were load to type QGraphicsItem?

[anda_skoa]

dropEvent() should be fine.

Have you checked if your dropEvent is called by dropping a file list or something else as suggested?

Item moving is, as I said before, unrelated to drag&drop.

Cheers,
_

[Mariusz_1990]

I will say truly that I can't check call by dropping a file list or something else...

this function doesnt working
void Plansza::dropEvent(QGraphicsSceneDragDropEvent *event)
{
if (event->mimeData()->hasImage()) {
dragOver = false;
pixmap = qVariantValue<QPixmap>(event->mimeData()->imageData());
update();
} else {
Plansza::dropEvent(event);
}
}

don't capture type QgraphicsItem why??
Maybe this function work properly but I have to write "connect" where signal will be function dropEvent?

[anda_skoa]

I will say truly that I can't check call by dropping a file list or something else...

Why? Do you have no drag enabled program on the machine that you run this on?

this function doesnt working
void Plansza::dropEvent(QGraphicsSceneDragDropEvent *event)
{
if (event->mimeData()->hasImage()) {
dragOver = false;
pixmap = qVariantValue<QPixmap>(event->mimeData()->imageData());
update();
} else {
Plansza::dropEvent(event);
}
}

Is it being called?
Btw, you still have the infinite recursion in there.

don't capture type QgraphicsItem why??

You are checking for image.

Maybe this function work properly but I have to write "connect" where signal will be function dropEvent?

No, dropEvent is an event handler method, not a slot.

Cheers,
_

[Mariusz_1990]

Ok I understood a little... but please maybe help me write this function that work properly? I want read ship postion, when ship will drop. I really have not idea that this work work properly...

[anda_skoa]

Your problem description is too abstract, i.e. there is no indication what your problem actually is.

Is your dropEvent() method being called? I.e. if you put some qDebug() output in there, so you see that output?
You can try using a drag from a different application, assuming you have any other program capable of drag&drop running on the same machine. If you run your program on the development machine than it is likely that you have a file manager there.

Cheers,
_

[Mariusz_1990]

Probably We don't understand. How I wrote earlier, I wanna only read postion my ships when I am dropping somewhere on SCENE in my program. I can't drag ships outside SCENE. When I added qDebug() to function dropEvent I didn't see any communique about captured image (ships) by function dropEvent.