[Qt-interest] Model/view conditionally accept dropped items

[Jugdish]

I have a model with items of certain "types" -- let's say type A, B, C, D.
The items of the model are drag/droppable, but I'd like it such that an item
accepts a drop only if the item being dragged is of the same type. So, when
dragging an item of type A, only other type "A" items will accept the drop.
Essentially, the state of each item's Qt::ItemIsDropEnabled flag needs to
dynamically update itself depending on what item is being dragged. What is
the best way to implement such behavior?
Thanks for your help.
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