Creating an Eclipse plug-in to display content assist regardless of cursor location

I'm working on some reflection stuff using Java across XML files. The process would be made much faster and less prone to error if I could get content assist to behave like a tree in a small window off to the side, but more than by my current cursor location.

My question is can this really be done without reinventing the wheel too much? Essentially I want to display a list of classes, choose a class, then drill down a TreeView similar to the outline view Eclipse has for a current open file and at some point I click a button below and it generates the desired XML formatted text I would have typed manually, this is generated based on whatever in the tree I have highlighted.

I've designed and begun work on the front and back end, but the piece th开发者_开发技巧at keeps eluding me is harnessing Eclipse's content assist to gather a list of practically anything I could possibly call in a given project.

Can this be done? I've been combing Eclipse's documentation for a few days and fighting with the source download dying halfway repeatedly.

I am not 100% if that's it but I had an eclipse plugin with spider in it's name in mind, which does what you described.

Maybe it is this one: http://eclipse-plugins.2y.net/eclipse/plugin_details.jsp?id=202

Furthermore when writing Eclipse plugins, it is useful to press ctrl+shift+f1 (eclipse plugin spy) once having worked in the pde this should be possible. It shows you info about all possible extensionpoints refering to your current view.