Re: [Fxruby-users] layout probs with TreeList.

[Hugh S. S. E. E. <hg...@dm...>]

On Wed, 16 Jul 2003, Lyle Johnson wrote:

> Hugh Sasse Staff Elec Eng wrote:
>
> > Oh, so that is an inherited attribute then, as it is not listed....
>
> Yes.
>
> > Yes, that did the job.
>
> Good.
>
> > I have since tried removing the layout hints from contents (the
> > horizontal frame, and found that I get the uncorrected behaviour.
>
> Right.
>
> > I see from the FOX Docs that these FILL_ hints cause this hehaviour:
> > "If more than one child with this option is placed side by side, the
> > available space will be subdivided proportionally to their default
> > size."
> > So when I had not set the FILL_X before, I was effectively getting
> > this anyway because of how LAYOUT_MIN_(WIDTH|HEIGHT) behave, and
> > when I turned this off in the contents (Horiz.  frame) I was getting
> > this too.  Only if One child and the the parent use LAYOUT_FILL will
> > that child be stretched to fill the parent.  Is that about right?
>
> Ummm, you lost me somewhere in there ;)
>
> When you don't specify, say, LAYOUT_FILL_X, the widget will usually just
> take up as much space as it needs (a.k.a. its "default" width). I don't
> think LAYOUT_FILL_* is ever a default behavior, though.

I think LAYOUT_MIN_WIDTH and LAYOUT_MIN_HEIGHT are the defaults for
the child widgets.  So the parent would, by default, allocate
according to that space.  If two children in the same (X|Y) have
LAYOUT_FILL_(X|Y) they conflict, so the parent must still use the
defaults.  If only one child has LAYOUT_FILL_(X|Y) then the parent
must have it too for it to take notice.  Is that right?
It is the parent's need for this hint that is difficult for me: I
thought it got the hints from its children...


> > If so this feels rather like Tk: I remember having to use fill
> > rather a lot when I used that.
>
> Yes, most modern GUI toolkits' layout managers owe a lot of their
> heritage to Tk's Packer layout manager. I know that some of GTK's layout
> managers are based on this concept, and I'm guessing that Qt's are as well.

Yes, I have got this impression, too. But there is a surprising
amount of criticism of Tk, particularly about it being "old
fashioned", about the place.
>
>
        Hugh