drag and drop with item views

[castorvert]

Thank you, i've finally understood what mimeTypes() is.
I have another question, if you please.

Let's take an example :

-I defined supportedDropActions() in a model as following :

Qt::DropActions ModeleDispos::supportedDropActions() const{
		return Qt::MoveAction;
	}

Qt::DropActions ModeleDispos::supportedDropActions() const{
		return Qt::MoveAction;
	}

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-I defined removeRows too.
-In "QAbstractItemView", it seems that "startDrag" and "dropEvent" use "supportedDropActions" so I think it's possible to move an item into the same view.
-the mimeTypes and mimeData are of the same Type.
but I couldn't move an item into the model.

It worked when I did :

Qt::DropActions ModeleDispos::supportedDropActions() const{
		return Qt::MoveAction|Qt::CopyAction;
	}

Qt::DropActions ModeleDispos::supportedDropActions() const{
		return Qt::MoveAction|Qt::CopyAction;
	}

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Do you know what could explain that ?

[wysota]

If you just drag an item, it is considered a copy action. To make a move action one has to hold some meta key -- control, alt or shift (I don't remember which) while performing the operation. I think it's possible to force some action but I don't know if it can be done without subclassing the view. Probably it would be easier to emulate a move within one view as a copy and handle it in dropMimeData().

[castorvert]

My solution was the following (I subclassed views) :

void viewSource::mouseMoveEvent(QMouseEvent *event)
{ 
	QModelIndexList liste=selectedIndexes();
	QMimeData *mimeData = model()->mimeData(liste);
	QDrag *drag = new QDrag(this);
	drag->setMimeData(mimeData);
	drag->setHotSpot(event->pos() - rect().topLeft());
	Qt::DropAction dropAction = drag->start( Qt::MoveAction);
	if (dropAction == Qt::MoveAction) {
		model()->removeRows(liste[0].row(),liste.size(),liste[0].parent());
	}
}

void viewSource::mouseMoveEvent(QMouseEvent *event)
{ 
	QModelIndexList liste=selectedIndexes();
	QMimeData *mimeData = model()->mimeData(liste);
	QDrag *drag = new QDrag(this);
	drag->setMimeData(mimeData);
	drag->setHotSpot(event->pos() - rect().topLeft());
	Qt::DropAction dropAction = drag->start( Qt::MoveAction);
	if (dropAction == Qt::MoveAction) {
		model()->removeRows(liste[0].row(),liste.size(),liste[0].parent());
	}
}

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and :

void viewTarget::dropEvent(QDropEvent *e) //viewTarget subclassed QListView
{
	QListView::dropEvent(e);
	e->setDropAction(Qt::MoveAction);
	e->accept();
}

void viewTarget::dropEvent(QDropEvent *e) //viewTarget subclassed QListView
{
	QListView::dropEvent(e);
	e->setDropAction(Qt::MoveAction);
	e->accept();
}

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I think it will remind you sth wysota

Thanks for all

[castorvert]

Well, in fact, my "removeRows" doesn't work because the selected items aren't obligatory following each others.

[wysota]

I think it will remind you sth wysota

Hmm... remind me what?