Re: JButton behavior in BoxLayout

Knute Johnson <>
Wed, 22 Sep 2010 18:59:18 -0700
On 9/22/2010 3:32 PM, Ian Shef wrote:

Knute Johnson<> wrote in news:b8qmo.73697

On 9/22/2010 8:29 AM, Fred wrote:

If I place a JButton in a panel with BoxLayout (vertical), the
button's placement differs depending on whether the button's text is
HTML or not.

Layout managers, unending problems. Check the MaximumSize of b2 and you
will discover that it is huge. Just set it to the same as b1 and it
should work just fine. You will find that every layout manager handles
the sizes differently. Why using HTML in the label of a JButton causes
this I don't know.

Why blame this on the layout manager? It seems to me that JButton is at

For two reasons that I can see, first JLabel does the same and second
I'm not sure how the width of the component could be determined if there
is HTML code to be displayed. I think the Integer.MAX is probably a
default maximum size when displaying HTML.

In the general case, I don't know which one is "correct". Should layout
managers be permitted to increase the size of a button? Sometimes yes (so
that a row or column of buttons can be sized similarly) and sometimes no
(because otherwise they can get stretched to ridiculous sizes).

Apparently BoxLayout does not concern itself with preferred width on a
Y_AXIS layout. Seems sort of silly to me but that's what you get with
BoxLayout. So I think it is pretty clear that this weird side effect is
the layout manager's fault. Whether that fault is an error I don't know
either, there could be some reason for it but I can't think of one right


Knute Johnson
email s/nospam/knute2010/

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