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Thanks for the reply. Yes, what you describe would work around the problem, but I thought of that as a 'brute force' approach :-) My application has been working the same way for years, so I'd prefer to try and find a simpler fix for it.
After a bit of research, I think the issue could be due to changes in how focus is handled for JDK 7:
so I'll investigate this first.
For the record, here's how I solved the problem:
The Canvas that was used for native rendering didn't receive any mouse events; they appeared to be lost somehow. Although my native CView-derived class didn't receive focus events, I noticed that CView::OnMouseActivate() was still being called when I clicked on the Canvas. I overrode this function and added a call to SetFocus(), which was enough to cause mouse wheel and keyboard messages to be passed to my native View.