[pygtk] Avoid leafs become root nodes on a 2-level tree TreeView

[jors]

Hi there people,

I'm new in this list (this is my first post) and I'm also new at pygtk,
so it was clear someday I was going to come to you guys :)

The thing is I want to do a 2-level tree with a TreeView, each level
having different node types:

- The 1st level will contain "folders". They should be able to contain
entries (leaf nodes), but they may not be moved/drag'n'dropped anywhere.

- The 2nd level will contain "leafs". They may not have any child (other
leafs). They must be always contained inside a 1st level node, but can
be moved/drag'n'dropped to any 1st level node.

The problem is I don't know how to avoid drag'n'dropping leafs to the
top level. This would not be a problem if the tree maintained it's
consistency, but it does not. For example, if I move a leaf at the 1st
level, the leaf gets copied instead of moved (even if I have defined
drag'n'drops as MOVES!).

I'm attaching a functional PoC to let you test what I'm trying to
explain. Just run it, drag'n'drop a leaf node to put it in the 1st level
(the same level as "folders") and see that it creates a copy. Even when
you drag'n'drop this last copy inside a 1st level node, it will create
another copy.

PS. JFYI, this won't be a filesystem mapping, but a hierarchy of
categories (root nodes) containing rss/feeds (leaf nodes). Hope I have
been clear enough.

Hope hearing from you soon,
-- 
jors <worbynet _ at _ gmail.com>

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