László Németh
5a48070f59
To avoid of rivers and too much hyphenation, add minimum
and maximum word spacing options, similar to XSL-FO/CSS
and DTP software.
Only limiting hyphenation was implemented: hyphenation
of the words are disabled, if it's possible to expand
or shrink the spaces of the line within the values specified
by the maximum and minimum word spacing. First try to apply
the minimum word spacing, and if not possible, then the
maximum word spacing.
Note: maximum allowed shrinking has been applied for the
hyphenated lines instead of the minimum to remove the
hyphenation, yet. With the suggested default word spacing
values, this results no or minimal differences.
New UNO paragraph properties:
com::sun::star::text::ParaWordSpacingMinimum
com::sun::star::text::ParaWordSpacingMaximum
New ODF paragraph attributes:
loext:word-spacing-minimum
loext:word-spacing-maximum
New paragraph settings on Text Align pane:
Minimum word spacing
Maximum word spacing
While the desired word spacing got "Desired" label.
Note: suggested values of minimum, desired and
maximum word spacing are 80%, 100% and 133% (default
values e.g. in Adobe InDesign), in narrow columns e.g.
60%, 100% and 150%.
Follow-up to commit 7d6696757d
"tdf#159923 sw cui offapi xmloff: add custom word spacing".
Change-Id: I7f2a07f7fdb634cb16cdd8c2c937ca911b968405
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/184595
Reviewed-by: László Németh <nemeth@numbertext.org>
Tested-by: Jenkins
ODF Import and Export Filter Logic
The main library "xo" contains the basic ODF import/export filter
implementation for most applications. The document is accessed
via its UNO API, which has the advantage that the same import/export
code can be used for text in all applications (from/to Writer/EditEngine).
The filter consumes/produces via SAX UNO API interface (implemented in
"sax"). Various bits of the ODF filters are also implemented in
applications, for example [git:sw/source/filter/xml].
There is a central list of all element or attribute names in
[git:include/xmloff/xmltoken.hxx]. The main class of the import filter
is SvXMLImport, and of the export filter SvXMLExport.
The Import filter maintains a stack of contexts for each element being read. There are many classes specific to particular elements, derived from SvXMLImportContext.
Note that for export several different versions of ODF are supported, with the default being the latest ODF version with "extensions", which means it may contain elements and attributes that are only in drafts of the specification or are not yet submitted for specification. Documents produced in the other (non-extended) ODF modes are supposed to be strictly conforming to the respective specification, i.e., only markup defined by the ODF specification is allowed.
There is another library "xof" built from the source/transform directory, which is the filter for the OpenOffice.org XML format. This legacy format is a predecessor of ODF and was the default in OpenOffice.org 1.x versions, which did not support ODF. This filter works as a SAX transformation from/to ODF, i.e., when importing a document the transform library reads the SAX events from the file and generates SAX events that are then consumed by the ODF import filter.
OpenOffice.org XML File Format
There is some stuff in the "dtd" directory which is most likely related to the OpenOffice.org XML format but is possibly outdated and obsolete.
Add New XML Tokens
When adding a new XML token, you need to add its entry in the following three files:
[git:include/xmloff/xmltoken.hxx][git:xmloff/source/core/xmltoken.cxx][git:xmloff/source/token/tokens.txt]