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Re: [css3-flexbox] Updates to Resolving Flexible Sizes

From: Daniel Holbert <dholbert@mozilla.com>
Date: Wed, 25 Apr 2012 11:31:09 -0700
Message-ID: <4F9842ED.6060508@mozilla.com>
To: fantasai <fantasai.lists@inkedblade.net>
CC: "www-style@w3.org" <www-style@w3.org>
Three notes on the new "Resolving Flexible Lengths" text:

# The total violation is the sum of the differences between each
# violating element's original size and its adjusted size.

The word "original" is ambiguous there -- it could be taken to mean
either "the size before we flexed it" or "the size after we flexed it".

I think we want it to mean the latter, so I suggest s/original/flexed/
and perhaps also s/adjusted/clamped/.

In that same chunk of text, I think "the difference" is backwards from
what we want it to be, and this makes the min/max behavior incorrect at
the moment.

Right now, I read the above text to say:
  Total Violation = Sum(OriginalFlexedSize - ClampedSize)

So if "max-width" is the only constraint in play, then the Total
Violation will be positive. (since ClampedSize is less than FlexedSize)

But the "Positive" clause says "Freeze all the items with _min_
violations" (of which there are none in this case), so we won't freeze
anything, and we'll loop forever.

I think we want to reverse the order of subtraction, like so:
  Total Violation = Sum(ClampedSize - FlexedSize)
(which is what it was in the previous spec-version)
so that a max-width clamping will produce a _negative_ Total Violation,
which will make us freeze items with max violations and produce sane

#  5. [...] If the total violation is:
#   Zero
#      If the free space is also zero[...]

This might be clearer with s/free space is/free space was/, since "the
free space" (from Step 2) has already been distributed at this point,
which makes talking about it in the present tense a little confusing.

Received on Wednesday, 25 April 2012 18:31:38 UTC

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