setLocationRelativeTo

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Allan Valeriano - 22 Feb 2007 13:54 GMT

Hi all,

I have a class that extends JFrame, and on its constructor, I have the
2 lines of code:

pack();
setLocationRelativeTo(owner);

I'd like to know what would be the difference if I swap those 2
lines...
It seems that if I use:

setLocationRelativeTo(owner);
pack();

the frame gets wrongly aligned but if I put the pack before
setLocationRelativeTo, it gets perfectly centered with the mother
window.
Does anybody knows what is the difference for java when I swap those
lines?

thanks in advance
Allan Valeriano

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Andrew Thompson - 22 Feb 2007 14:12 GMT

> Hi all,
>
[quoted text clipped - 14 lines]
> setLocationRelativeTo, it gets perfectly centered with the mother
> window.

Given that pack()..
"Causes this Window to be sized to fit
the preferred size and layouts of its
subcomponents. "
..I consider your result unsurprising.

I would generally pack() a frame before
it is setVisible(true), let alone before
attempting to set its location.

> Does anybody knows what is the difference for java when I swap those
> lines?

One works as advertised, the other is
expected (by my reading of the JavaDocs)
to produce unsatisfactory results.

Call pack() first, then the setLocationRelativeTo
method can have a good idea how big the (J)Frame
needs to be (and 'centering' it based on the
position of other components becomes anything
more than guesswork).

Andrew T.

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setLocationRelativeTo

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