<AWT Dev> Paint a JComponent without clipping children

Herve Girod herve.girod at gmail.com
Thu May 5 15:45:37 PDT 2011

Thanks, I was not sure on which mailing list it should be posted, but you
are right, it could only be swing...



2011/5/5 Anthony Petrov <anthony.petrov at oracle.com>

> Hi Herve,
> JComponent is a Swing component. I suggest you to subscribe to the
> swing-dev at openjdk.java.net mailing list and post your question there.
> --
> best regards,
> Anthony
> On 5/5/2011 2:14 AM, Herve Girod wrote:
>> Hello,
>> I'm new to this mailing list and I'm not *really* asking how to do it
>> because I know how it's possible to do it by using a hack (mainly getting
>> and setting the BUFFER and TILE parts of the "flags" field for the
>> JComponent by reflection, and "rewriting" the paintChildren method without
>> the clipping part). I'm using it in the
>> http://sourceforge.net/projects/j661/  project to be able to use custom
>> Swing containers which only offset the position or transform their children
>> graphic context, without clipping them (allowing to use negative positions
>> for the children widgets, for example).
>> I'm asking if there is a way to do this without playing with the private
>> "flags" field, because I need to be able to do the same thing in a
>> restricted JNLP environment. I know a "regular"' way to do this, but it
>> would be a little cumbersome (offsetting the positions of all children
>> widgets in the parent container, to be sure that the positions of the
>> children are never negative, for example). But it's not very good for
>> performance when something change in the parent container....
>> There are many projects which either play with this private field, or use
>> transforms, but in this later case they still apply a clipping. Is it
>> possible to play with the Graphics2D clippings for example before using the
>> JComponent paintChildren method - or would this approach work ?  Or would
>> the only way to do it without compromising Security be to have a way to get
>> / set the TILE and BUFFER value of the "flags" field without reflection ?
>> Thanks by advance if you have ideas about this, and sorry if this prose is
>> not crystal clear ;)
>> Herve Girod
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