Re: GridBagLayout - A simple test program

Knute Johnson <>
Tue, 12 Feb 2008 14:25:39 -0800
Daniele Futtorovic wrote:

On 2008-02-11 20:58 +0100, Knute Johnson allegedly wrote:

Daniele Futtorovic wrote:

On 2008-02-10 18:45 +0100, Knute Johnson allegedly wrote:


Thanks very much for you input. I think you are correct that it
will need to have a method to set preferred size if not min and
max too. As to resizing the applet, I don't think that can be

You think so? How about: putting a border around the container,
adding a MouseMotionListener, changing the cursor to RESIZE when it
hovers the eastern or southern border, or the south-eastern edge,
and reacting to mouse drags by resizing the container every few
pixels, or indeed every pixel?

That's a good idea. I implemented it slightly differently, there is
a small box in the lower right corner. Clicking and dragging the box
 resizes the panel. If using the JWS version resizing the frame will
 also reset the panel to the size of the content pane.

*Very* nice. Could you also set a specific cursor for that region?

Thank you. It now has a cross hair cursor.

That being said, I'm not too sure whether the possibility for the
user to be able to compile and run the code himself deserves as
much emphasis as you put on it. I don't see it as much of a
constraint to have to play with an applet rather than with a
self-compiled program. I suppose you would like to see your utility
as a tool which any GUI developer could toy with whilst in the
process of designing his new layout -- but unless your app sports
some more complex features (see below), that expectation is
unrealistic IMHO.

Well, let me know what you think about it now.

The coloured panels are an interesting idea. I don't really know what
else to think of them.
One thing, however, I think you really should implement is control of
the components through pop-up menus. Otherwise, especially for
non-native English speakers who do not have an automatic connection
between a colour and its English name, this means having to step through
list each time, trying to figure out how the panel they want to modify's
colour is called.
You should consider the use of Action Objects. In all cases where
different UI-actions can trigger the same reaction, they're darn well

I labeled the colored components with their names although I'm thinking
of undoing that. They now have popup menus to remove or set

I couldn't figure out how to use Actions without making 30 of them. I'm
open to suggestions. I have 30 menu items though so that may not be a
good argument.


Knute Johnson
email s/nospam/knute/

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