I’ve worked on the implementation of a GEF editor for an EMF-based model, using both the GEF book and vainolo‘s great GEF tutorials. The model consists of several types of nodes and connections, with different layout requirements for the display of their figures in the editor, as follows.
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I am currently developing a GEF-based editor for an EMF-based model with the help of the GEF Book, and vainolo’s incredibly helpful blog posts.
I had implemented connection creation, following vainolo’s post about connections, but in my editor, the added connection figures never showed up, although the respective model objects had been instantiated (I’ve checked!). It was only after I had saved the graph, and re-opened the editor that the connection figures became visible. The respective code bits looked like this:
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New Code on the Block 