[Qt-interest] prevent a drop in QTreeWidget

[Ross Bencina]

Graham Labdon wrote:
if (index.row() > 1 || (index.row() == 1 && dropIndPosition == 
QAbstractItemView::BelowItem))
{
QAbstractItemView::dropEvent(event);
}
else
{
event->setDropAction(Qt::IgnoreAction);
event->accept();
}
}

> The problems I have are
> 1. I cannot move an item to the bottom of the tree (in this case 
> dropIndicatorPosition is OnViewport)

Well you'll have to allow OnViewport in the first branch of your if 
statement then. You could check the pos().x() to know if you're above or 
below the items (I think I get the top of the first item using 
QAbstractItemView::visualRect  and compare the event pos.x against that).


> 2. If an item has subitems - when I move the item the subitems are removed

That, I'm afraid, I know nothing about. I'm not sure if the default 
drag-and-drop mechanism supports deep copying of items. You might want to 
post a new question and give details of the Model implementation you're 
using.

Ross.