Swing Question (Drag and Drop??)

Posted on 2001-06-12
Last Modified: 2013-12-14
I'm wondering if anyone could tell me (a) if the following is possible in swing and (b) if so, how you'd implement it please ! :)

I'm wondering if I could have the following situation,
a JFrame that contains 2 scroll panes,
One on the left, one on the right.
In each scroll pane there is a JTree.
I'd like to create the visual "mapping" between nodes of these two seperate trees. I.E. You click on a node in the left jtree, and drag a line to a another node in the right jtree. When you "let go" a line permenantly appears between the 2 nodes in the 2 different trees. Can this be done ??? the drawing of lines between 2 seperate components ?? Personally, I don't think it can be done in swing at the moment, but ppl around me are saying "yeah java drag and drop can do that" without giving me any details :) Sun's drag and drop tutorial is not written yet - and the javaworld one mentions nothing like the behaviour I've described above.

Any opinions/insights ????

Also as a side note ...... The default behaviour of a jtree is that it expands left-to-right, can you change it so that it expands right-to-left ??? ie "backwards".

any help/opinions greatly appreciated,
Question by:somadude
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Accepted Solution

TimYates earned 200 total points
ID: 6180804
I think for the line drawing you will have to use the classpane on your main window

try having a look at:


Is quite a nice page for explanation...

Now drag and drop...  try


Hope this helps...  Sorry I havent really supplied you with any code, but these links should explain stuff better than I could...

One thing to watch out for drag and drop...  It seems to work differently on Linux/Solaris/Windows (Linux bein the worst) so you might need to do a bit of tweaking and have access to all these systems to ensure it works fully :-)

Have fun!!

Good Luck!!


Expert Comment

ID: 6181261
Hi ,
I have a word document write by a university teacher.
Maybe that could be useful to you.

Please e-mail me ( sending this to you.

LVL 35

Expert Comment

ID: 6181278
Instead of posting this as an answer, wouldn't it have been best posting a comment?  Also, this doesn't help anyone in the future who buys this question...

Could you post the most important points/code as a comment?

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Expert Comment

ID: 6183826

Have a look at the ee guidlines for comments and answers, and then have a good hard look at your 'proposed answer'.
If you have an answer then post it, otherwise ...

Author Comment

ID: 6184985
Well no sign of the word doc, so for now it's more a comment than answer, cheers.

Expert Comment

ID: 6185135
Sorry for posting like answer.
My fault. In the future will not happend again.
Sorry again.


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Expert Comment

ID: 6188880
Apology accepted :)
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Expert Comment

ID: 6190104
From me too :-)
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Expert Comment

ID: 9027578
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

[points to TimYates]

Please leave any comments here within the next seven days.
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