action item #0013: improved proposal for style:join-border

[Oliver-Rainer Wittmann - Software Engineer - Sun Microsystems<Oliver-Rainer.Wittmann@Sun.COM>]

Dear TC members,

according to action item #0013 I will give an improved proposal for
already accepted paragraph property style:join-border:

<improved proposal>
Use the style:join-border property to specify, that the border is to be
extended around the next paragraph, if the borders and the margins of
both paragraphs are holding the following conditions:

(1) Values of properties fo:border-top, fo:border-bottom, fo:border-left
and fo:border-right are the same - these values can also be given by
property fo:border.

(2) Values of properties style:border-line-width-top,
style:border-line-width-bottom, style:border-line-width-left and
style:border-line-width-right are the same - these values can also be
given by property style:border-line-width.

(3) Values of properties fo:padding-left and fo:padding-right are the
same - these values can also be given by property fo:padding.

(4) Values of property fo:margin-right are the same - these values can
also be given by property fo:margin.

(5) Values of properties fo:margin-left - can also be given by property
fo:margin - and fo:text-indent fulfill one of the following conditions:
(a) All values are the same.
(b) Values of property fo:margin-left are the same and values of
property fo:text-indent are non-negative.
(c) Value of property fo:margin-left of one paragraph whose value of
property fo:text-indent is non-negative equals the sum of values of
properties fo:margin-left and fo:text-indent of the other paragraph
whose value of property fo:text-indent is negative.
(d) Both values of property fo:text-indent are negative and the sums of
values of the properties fo:margin-left and fo:text-indent are equal.

Borders are joined by default.

<define name="style-paragraph-properties-attlist" combine="interleave">
      <optional>
          <attribute name="style:join-border">
              <ref name="boolean"/>
          </attribute>
      </optional>
</define>
</improved proposal>


Comment on the above given conditions:
Holding the above given conditions for the borders and the margins assures

(A) that the border lines of the paragraphs are the same - conditions
(1) and (2) - and

(B) that the areas taken by each of these paragraphs are equal on its
left and right according to the box model given by the W3C for CSS - see
http://www.w3.org/TR/REC-CSS2/box.html, chapter 8.1 - conditions (3),
(4) and (5).

An extension of the border of a paragraph around its next paragraph only
makes sense, if these conditions are hold.


Best regards, Oliver.

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Sun Microsystems GmbH    Oliver-Rainer Wittmann
Nagelsweg 55             Software Engineer - OpenOffice.org/StarOffice
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Germany                  Fax:   (+49 40) 23 646 550
http://www.sun.de        mailto:oliver-rainer.wittmann@sun.com
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Oliver-Rainer Wittmann (od) - OpenOffice.org Writer
OpenOffice.org Engineering at Sun: http://blogs.sun.com/GullFOSS