Jan Tošovský created FOP-3141:
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Summary: Auto-calculating top/left positions based on bottom/right
when height/width is provided
Key: FOP-3141
URL: https://issues.apache.org/jira/browse/FOP-3141
Project: FOP
Issue Type: Improvement
Components: layout/block
Affects Versions: 2.8
Reporter: Jan Tošovský
When the block container is to be placed on the bottom edge, it is necessary to
specify the top position even if the bottom and height attributes are specified
(so the top position could be auto-calculated).
I actually try generating some FO files originally designed for XEP, but for
FOP I have to tweak all these top positions. It is straightforward, but I am
losing the original semantics (top="18.8cm" instead of more clear bottom="0").
I could locate the possible place for tweaking:
[https://github.com/apache/xmlgraphics-fop/blob/main/fop-core/src/main/java/org/apache/fop/fo/properties/CommonRelativePosition.java]
In the constructor, if the top is zero, but both the bottom and the height are
non-zero, the top could be calculated. Same for the left and right + width).
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