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Figure painting lifecycle [message #90640]

Wed, 13 August 2003 16:43

Eclipse User

I have a Figure which does a bunch of pre-calculations for painting
itself. It also uses the same calculations to figure out the necessary
border insets, and other bounding boxes for labels etc. What is the
preferred place that I should make these calculations. It seems that
the first thing that is called is getPreferredSize so I am currently
doing it there. Is this approach valid?

Ray

Re: Figure painting lifecycle [message #90656 is a reply to message #90640]

Wed, 13 August 2003 18:01

Eclipse User

Originally posted by: none.us.ibm.com

The label figure is a good example of this. It uses "lazy" calculation of
such values. So, when the values become invalid (invalidate() is called),
the previous results are thrown away. New values are calculated "as
needed", since getPreferredSize() is not guaranteed to be called.

"Ray Tsui" <Raymond_Tsui@ca.ibm.com> wrote in message
news:1q7ljvsk1u97ol774no7kqfg2mhd15bv72@4ax.com...
> I have a Figure which does a bunch of pre-calculations for painting
> itself. It also uses the same calculations to figure out the necessary
> border insets, and other bounding boxes for labels etc. What is the
> preferred place that I should make these calculations. It seems that
> the first thing that is called is getPreferredSize so I am currently
> doing it there. Is this approach valid?
>
> Ray
>

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