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How can I change the DnDManager behaviour when d'n'd' the parts [message #1803569]

Mon, 04 March 2019 07:03

Eclipse User

Hi I have a problem when trying to modify the behaviour when dragging a part to a certain partStack to be forbidden or dragging the part outside the window detaching the part.
I've tried copying the whole package and classes and then modifying the behaviour in canDrop() in the drop agents and then specify explicitly to use my DnDManager copied but it stil runs the classes from the original jar.

It works I could modify the behaviour but when leaving the drag it enters in the compiled code from eclipse not in mine. Is there other way to do that?
I've tried doing it using reflection and using javaassist to intercept the methods but it's to complex and I would need the whole variables from the specficic drop agent.

Re: How can I change the DnDManager behaviour when d'n'd' the parts [message #1803615 is a reply to message #1803569]

Tue, 05 March 2019 09:10

Eclipse User

So you should be able to use a feature patch and replace the provided bundle with your fork. What would be even more useful is to figure out how to make the current DND more pluggable so that different drag policies can be provided, and then propose it as a patch.

One idea is to have a DND policy service that is provided as an OSGi service. That would allow the policy service to be replaced entirely. During DND, you'd resolve the policy service from the active part, allowing the policy to be over-ridden on a per-part, -perspective, -window, or -application basis and thus allowing very fine-grained policies.

Brian.

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