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Re: [css-flexbox] Clarifying the new "Resolving Flexible Lengths" text: un-frozen items and free-space recomputation

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Wed, 5 Feb 2014 13:42:38 -0800
Message-ID: <CAAWBYDAz_LFjJrMAJRwBqwW8QGvgw12JP5-y0FPHoo26hOObDA@mail.gmail.com>
To: Daniel Holbert <dholbert@mozilla.com>
Cc: www-style <www-style@w3.org>
On Thu, Jan 30, 2014 at 3:15 PM, Daniel Holbert <dholbert@mozilla.com> wrote:
> Hi Tab,
> I've got two more clarification questions on the new "Resolving Flexible
> Lengths" text:
>  1) In the new "Resolving Flexible Lengths" text, the Loop has several
> mentions of "all the flex items" or "each item" -- I think those all
> want to be specifically about *non-frozen* items.  I don't think we want
> to apply those operations (e.g. summing desired sizes, clamping to
> min/max range) on frozen items (since desired sizes are no longer
> relevant, and we've already clamped).
>   So: I think every mention of "items" or "each item" in the Loop steps
> 3, 4, and 5 might want to be replaced with "non-frozen item[s]".

Good point.  Done.

>  2) Right now, the "free space" is set once, before the Loop, and then
> never updated. I think this is problematic. For example -- at the end of
> the first Loop iteration, we may discover a min-violation and freeze a
> flex item at a larger size (effectively eating up some, maybe all, of
> the free space) -- but then on the next Loop iteration, the algorithm
> doesn't account for that free-space-reduction. We'll still try to
> distribute all of the original free space among the remaining
> (un-frozen) items, and we'll end up sizing things too big.
>   So: I suspect we might want to be recalculating the free space at the
> end of each loop iteration, or something like that...

Ah, you're right.  I was remembering that we don't want to recalculate
the *desired free space* (I have some examples that show why that's
bad, if you need), but forgot that we still need to recalc the actual
free space.  Done.

Received on Wednesday, 5 February 2014 21:43:47 UTC

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