Is there an equivalent of OnExternalOjbectsDropReject for a GoView?

GoDiagram (6 and previous)
1

I see that there is a drop reject for background selection and object selection. Is there one for external objects? I need this feature to undo markup of the diagram (highlighting of items for example). Note that I am not dragging and dropping GoObjects.

Thanks,
John

2

Can you tell me more about the user interaction and what you want to happen? It sounds like you’re trying to prevent selection in some cases.

3

Hi Jake. I’m doing external drag-n-drop. As I drag over various elements of my diagram I highlight them. However, there are many drop operations that are not allowed. Even when drop is not allowed, I highlight the target element so that it is clear what the rejected target is. If the user releases the mouse while over such a highlighted but disallowed element, I don’t know how to receive an indication that the drop was rejected. I have discovered that I get the desired effect if I override OnMouseOver for my nodes and links and always un-highlight a highlighted element. None the less, it would be nice to have a more succinct solution.

Thanks,
John

4

Ah, that helps. Look at how CollapsingRecordNode handles OnEnterLeave. I think that may help.

look for this comment in the code (to enable drag/drop)

//??? comment out the following three assignments,