QGraphicsView: Need event emitted when line is dropped on rectangle?

I'm building an editor (similar to MS Visio) to draw a hierarchical finite state machine. Hence I need to connect rectangles (states) with lines (transitions) in my drawing area.

I will use a drag and drop approach.

Any idea on how to have an event emitted when a line is dropped (or is connected to) on a rectangle?

If you mean you are moving a line item and want to check whether it currently insects with a rectangle item, see QGraphicsItem::collidesWith and QGraphicsScene::collidingItems.

Cheers,
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