Ah, yes, I think that may be true. Containers must calculate their
preferred size before they are actually given a size and called to lay
out. It stands to reason that baseline alignment may factor into that
calculation, so you are right that we can't simplify it in this way.
On Nov 3, 2009, at 7:56 AM, Todd Volkert wrote:
Containers that can align to baseline may need to know the baselines
of
their child components when calculating preferred size (where it's
going to
place the children may affect the preferred size of the container).
Since
the container has may have a width constraint in mind when it asks its
children for their preferred size, it stands to reason that the same
width
constraint will apply when it asks the children for their
baselines. Thus,
I think the baseline calculation has to take a width constraint.
From a high level, it seems like this should be OK, since baseline
alignment
isn't so much about setting size as it is aligning things after
their sizes
have been set.
I think what I'm saying above is that this assumption may not be
correct.
Is it possible that a child's baseline will need to be calculated
during the
preferred size calculation of its parent (and would affect the
preferred
size of the parent)? I want to say we have to assume yes, but I'm
not 100%
sure.
-T
