I knew this message would be a big hit :-)
I’ve raised an issue on W3C’s Bugzilla:
http://www.w3.org/Bugs/Public/show_bug.cgi?id=11672
Meanwhile, I’ll investigate the implementation of a more expected
behaviour.
Thanks,
Vincent
On 22/12/10 19:04, Vincent Hennebert wrote:
Hi,
I have a question for the XSL-FO scholars out there. Given the following
FO snippet:
fo:blockLorem ipsum dolor fo:inline id=outer
border=1pt solid redfo:inline id=inner
font-size=30ptsit/fo:inline/fo:inline amet/fo:block
how tall is the border supposed to be?
Section 4.6, “Inline-areas”, states that “An inline-area with
inline-area children has a content-rectangle which extends from its
dominant baseline by its text-depth in the block-progression-direction,
and in the opposite direction by its text-altitude”.
In the case of the outer inline-area, text-altitude and text-depth are
taken from the font metrics and amount to 11100mpt. So the
border-rectangle is 11.1pt high.
The inner inline-area has a font-size of 30pt, which makes its
content-rectangle 27750mpt high, which largely overflows the
border-rectangle of the outer inline-area.
Have I missed anything, or is this behaviour utterly counter-intuitive?
Note that the height of the inner inline-area still is taken into
account when building lines; this is explained in details in section
4.5, “Line-areas” but, basically, when the inline-stacking-strategy is
left to its default value, the maximum-line-rectangle is used and
determined according to the content-rectangles of /all/ the inline-areas
stacked within the line-area.
I came to think about this issue when it was mentioned to me that only
the bottom part of an image surrounded by an fo:basic-link element is
active. The description of fo:basic-link closely follows the one for
fo:inline so the explanation above applies. If I understand well, the
only way to increase the content-rectangle of the basic-link area is to
increase the font size, but that font-size would need to be computed in
a pre-processing step. It would have to take into account the active
font where the basic-link occurs, and the size of the image, and
possibly content-height set on the fo:external-graphic. That would be
horribly tricky and fragile.
Any thoughts?
Thanks,
Vincent
