Strange behavior of scrolling in TreeView

I'm observing the strange scrolling behavior in a simple tree. When I am developing nodes, the exchange of the vertical scroll bar position, i.e. the node that I develop, changes its position. It is unusual (I have never seen this in a toolkit of user interface or application I have used so far) and is problematic as far as where the user experience is concerned. Is this a bug or do I need to clarify is that somewhere?

It's a little embarrassing. It seems to behave correctly if the tree does not scroll down (although the exact behavior is more subtle, I think).

I have filed applications to "tweak" to JIRA.

BTW, there is probably something wrong with my code model because the tree completely falls apart, when I collapse node '19' once again after that.

The model is very good (except that it explodes if you expand the nodes deep enough to overflow integers). The problem is that you forgot to handle the case where the cells are empty in your implementation TreeCell. You need

protected void updateItem(Integer item, boolean empty) {
                        super.updateItem(item, empty);
                        if (!empty) {
                            setText(item != null ? String.valueOf(item) : "");
                        }  else {
                            setText(null);
                        }
                    }

(It is probably safer to move the call to super.updateItem (...) to the top of the method, as you never know which 'housekeeping', he can perform.) This seems to make no difference here).

Tags: Java

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