How to prevent the focus change in JTree?

I did a soft, JTree on the left, have some info of categories and there is data on the category on the right side, data can be modified, when the selection of nodes will change, first the application will check the registration of State data, if it is registered, a prompt dialog , confirming 'save', 'don't save', 'Cancel', if the user select Cancel, I hope that the selection will not change. How to do with this?
Thank you.

The right way is to use a TreeSelectionModel that supports the veto of the selection. Unfortunaly by default, it does not, do not find much elsewhere * and here, the margins are too small for a jot down.

Fortunately, in this era we got links!

VetoTreeSelectionModel: [url http://www.xs4all.nl/~walterln/java/veto/VetoTreeSelectionModel.jar] jar with the sources or [url http://www.xs4all.nl/~walterln/java/veto/VetoTreeSelectionModel.jnlp] start to see it in action.

He needs some tests test remains to be seen if the events that I generate are correct (I think should exclude the child path if the path of the parent selection is removed), but it is usable as generally interested only the selection changes to :).

I think I'll do a VetoListSelectionModel as well and maybe I should write something for http://tips4java.wordpress.com/.

* [url http://forums.sun.com/thread.jspa?threadID=645258] here's one but doesn't seem very complete and I don't like PropertyVetoException control flow.

Tags: Java

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