Date: 2005-03-01T05:08:37
   Editor: JeremiasMaerki
   Wiki: XML Graphics - FOP Wiki
   Page: PageLayout/InfluencingFeatures

   List of all elements that influence page breaking

New Page:

= Things influencing page breaking =

This page tries to list all the elements that influence page breaking. This 
should help determine the right approach.

== available IPD ==

The available IPD has influence on line breaking. Each line may be a BP. The 
available IPD may be different between two pages, ex. the first page in 
portrait mode the second in landscape. Also, a block with span="all" in a 
'''multi-column page''' has a different available IPD than a block with 
span="none". '''Side-floats''' also have an influence on the available IPD. In 
this case, it's even more complicated because the line breaking mechanism has 
to know the available IPD for each an every line.

== spacing ==

space-before and space-after add conditional or unconditional lengths in BPD.

== keeps and breaks ==

Keeps and Breaks add conditional or unconditional constraints to the boxes to 
be layed out.

== widows and orphans ==

These attributes are special keep situations.

== multi-column layout ==

Multi-column layout not only has an influence on the available IPD, spans may 
split up the available content area. Furthermore, spans cause the preceding 
parts to be balanced in their columns ("sub-pages"). Only then is the starting 
point in BPD known and therefore the remaining available BPD.

== tables ==

Table headers and footers (and table-omit-header|footer-at-break) have an 
influence on the allocated BPD. With the border collapsing model there are 
additional influences on the allocated BPD by the complex interactions between 
the individual borders. The presence or absence of an adjacent table header or 
footer also additionally interacts with the decision for an effective cell 
border. See CollapsingBorderModel.

== footnotes ==

Footnotes use up BPD and grow upwards from the bottom of the available BPD.

== last-page layout ==

When the the flow runs out of FOs the last page is reached and the current page 
should be converted to the last page and re-layouted. If the last page provides 
less BPD than the next-to-last page it may be that the last page actually 
overflows. (In this case the now next-to-last page should probably be again 
re-layouted with the previous page-master but with the available BPD of the 
last-page (to get the headers and footers right.)

== references (page-number and page-number-citations) ==

This is only applicable if there is a plan to replace the reserved space for 
these FOs by the effective space used.


See also:
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