Percentages

[Finn Bock <bc...@worldonline.dk>]

Hi,

I just uploaded a patch which add support for percentages and 
calculations on percentages to bugzilla.

I don't think that the patch is quite right in its attempt to find the 
correct base length to combine with the percentage. Some of my confusion 
comes from the fact that I can't tell the different boxes/areas/blocks 
apart.

How f.ex. are these specifications different:
- ipd of closest area generated by a block-level fo
- width of containing block
- ipd of closest ancestor block-area.

Perhaps somebody who understand the spec better then me can describe 
what boxes and sizes that are to used.

I went through the spec and came up with these descriptions of the bases 
for the properties that support percentage:


top, bottom, height, max-height:
     height of containing block if explicit. Auto otherwise.

left, right, padding-*, margin-[left,right],
max-width, min-width, width, text-indent:
     width of containing block

background-position-horizontal, background-position-vertical:
     Size of padding-rectangle. Relative values.

font-size:
     inherited font-size.

margin-[top,bottom]:
     width of containing block, except for page context where it
     is page box height.

[start,end]-indent:
     ipd of containing reference-area.

space-[end,start], line-line-end-indent:
     ipd of closest ancestor block-area.

alignment-adjust:
     'height' if fo:external-graphics or fo:instream-foreign-object,
     'font-size' if fo:character and 'line-height' otherwise.

baseline-shift:
     'line-height' of the parent-area.

block-progression-dimension:
     corresponding dimension of closest area generated by a
     block-level fo.
     Auto if not specified explicit.

content-[height,width]
     intrinsic height and width

inline-progression-dimension:
     corresponding dimension of closest area generated by a
     block-level fo.
     Auto if not specified explicit.

min-height:
     height of containing.

line-height:
     'font-size'

leader-pattern-width, leader-length:
     ipd of content-rect of parent area.

column-gap:
     width of region being divided into columns.

extent:
     corresponding height or width of the page.

column-width:
     width of table.

text-altitude, text-depth:
     fonts em-height.

provisional-label-seperation, provisional-distance-between-starts:
     ipd of closest block-area that is not a line-area

vertical-align:
     'line-height'


regards,
finn

Re: Percentages

[Finn Bock <bc...@worldonline.dk>]

[Simon Pepping]

> Quite a piece of work. I will try to understand it.
> 
> A small correction:
> 
>>margin-[top,bottom]:
>>    width of containing block, except for page context where it
> 
>       ^^^^^
> 	  height (I suppose).

Well, not according to the spec:

http://www.w3.org/TR/2001/REC-xsl-20011015/slice7.html#margin-top

(my patch does not deal with the block-width / page-height issue 
correctly btw).

regards,
finn

Re: Percentages

[Simon Pepping <sp...@leverkruid.nl>]

Quite a piece of work. I will try to understand it.

A small correction:

On Sun, Feb 08, 2004 at 10:03:57PM +0100, Finn Bock wrote:
> margin-[top,bottom]:
>     width of containing block, except for page context where it
      ^^^^^
	  height (I suppose).

Regards, Simon

-- 
Simon Pepping
home page: http://www.leverkruid.nl