Writer application code.
Exact history was lost before Sept. 18th, 2000, but old source code
comments show that Writer core dates back until at least November
1990.
== Module contents ==
* inc: headers available to all source files inside the module
* qa: unit, slow and subsequent tests
* sdi
* source: see below
* uiconfig: user interface configuration
* util: UNO passive registration config
== Source contents ==
* core: Writer core (document model, layout, UNO API implementation)
* filter: Writer internal filters
* ascii: plan text filter
* basflt
* html: HTML filter
* inc: include files for filters
* rtf: thin copy&paste helper around the UNO RTF import filter (in writerfilter)
* writer
* ww1
* ww8: DOC import, DOC/DOCX/RTF export
* xml: ODF import/export, subclassed from xmloff (where most of the work is done)
* uibase: user interface (those parts that are linked into sw & always loaded)
* ui: user interface (optional parts that are loaded on demand (swui))
== Core ==
There is a good overview documentation of basic architecture of Writer core
in the OOo wiki:
http://wiki.openoffice.org/wiki/Writer/Core_And_Layout
http://wiki.openoffice.org/wiki/Writer/Text_Formatting
Writer specific WhichIds are defined in sw/inc/hintids.hxx.
The details below are mainly about details missing from the Wiki pages.
=== SwDoc ===
The central class for a document is SwDoc, which represents a document.
This is a huge class with hundreds of methods; there are some efforts
to split up the class into many smaller classes that implement more
specific interfaces but this is not fully implemented yet; see the various
IDocument* classes.
=== SwNodes ===
Basically a (fancy) array of SwNode pointers. There are special subclasses of
SwNode (SwStartNode and SwEndNode) which are used to encode a nested tree
structure into the flat array; the range of nodes from SwStartNode to its
corresponding SwEndNode is sometimes called a "section" (but is not necessarily
what the high-level document model calls a "Section"; that is just one of the
possibilities).
The SwNodes contains the following top-level sections:
1. Empty
2. Footnote content
3. Frame / Header / Footer content
4. Deleted Change Tracking content
5. Body content
=== Undo ===
The Undo/Redo information is stored in a sw::UndoManager member of SwDoc,
which implements the IDocumentUndoRedo interface.
Its members include a SwNodes array containing the document content that
is currently not in the actual document but required for Undo/Redo, and
a stack of SwUndo actions, each of which represents one user-visible
Undo/Redo step.
There are also ListActions which internally contain several individual SwUndo
actions; these are created by the StartUndo/EndUndo wrapper methods.
=== Text Attributes ===
The sub-structure of paragraphs is stored in the SwpHintsArray member
SwTxtNode::m_pSwpHints. There is a base class SwTxtAttr with numerous
subclasses; the SwTxtAttr has a start and end index and a SfxPoolItem
to store the actual formatting attribute.
There are several sub-categories of SwTxtAttr:
- formatting attributes: Character Styles (SwTxtCharFmt, RES_TXTATR_CHARFMT)
and Automatic Styles (no special class, RES_TXTATR_AUTOFMT):
these are handled by SwpHintsArray::BuildPortions and MergePortions,
which create non-overlapping portions of formatting attributes.
- nesting attributes: Hyperlinks (SwTxtINetFmt, RES_TXTATR_INETFMT),
Ruby (SwTxtRuby, RES_TXTATR_CJK_RUBY) and Meta/MetaField (SwTxtMeta,
RES_TXTATR_META/RES_TXTATR_METAFIELD):
these maintain a properly nested tree structure.
The Meta/Metafield are "special" because they have both start/end
and a dummy character at the start.
- misc. attributes: Reference Marks, ToX Marks
- attributes without end: Fields, Footnotes, Flys (AS_CHAR)
These all have a corresponding dummy character in the paragraph text, which
is a placeholder for the "expansion" of the attribute, e.g. field content.
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