b7d4418c30
The bugdoc loops on calculating the follow of SwTextFrame 560, the one
containing "Hiermit nehme ich das Angebot an" in a cell with rowspan 3,
while the table is being split and its first row (also now its last
i.e. split row) is being formatted.
Loop in CalcFollow() because the follow is in the same upper frame as
its master and cannot move forward, so the 2nd call to pMyFollow->Calc()
after pMyFollow->Prepare() always sets the SetPrepWidows() flag on the
master and in that case the loop never terminates.
The problem is that the check in WidowsAndOrphans::FindWidows() of
GetThisLines() uses stale cached data - the value returned is 4, but
the frame contains fewer lines at that point and doesn't have lines to
spare for the follow; the cached value is only updated at the end of
SwTextFrame::Format(). Fix it by calling ChgThisLines() here.
But this fix only helps for the first SwTextFrame in a cell; the next
one with id 561 loops in a similar way. The problem then is that
SwTextFrame::PrepWidows() always calls SetPrepWidows(), even if the
Orphan-rule of the frame prevents it from giving lines to the follow.
Fix this by calling SetPrepWidows() only if lines are removed.
This also helps for the 2 attachments of tdf#118104.
(regression from commit 18765b9fa7
particularly the change in SwFrame::IsMoveable()
in the sense that it didn't loop before but there isn't anything
obviously wrong with this commit)
Change-Id: Ia1e5928a6510e68520b29eb265e26ffd0627c52e
Reviewed-on: https://gerrit.libreoffice.org/68402
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>
LibreOffice
LibreOffice is an integrated office suite based on copyleft licenses and compatible with most document formats and standards. Libreoffice is backed by The Document Foundation, which represents a large independent community of enterprises, developers and other volunteers moved by the common goal of bringing to the market the best software for personal productivity. LibreOffice is open source, and free to download, use and distribute.
A quick overview of the LibreOffice code structure.
Overview
You can develop for LibreOffice in one of two ways, one recommended and one much less so. First the somewhat less recommended way: it is possible to use the SDK to develop an extension, for which you can read the API docs here and here. This re-uses the (extremely generic) UNO APIs that are also used by macro scripting in StarBasic.
The best way to add a generally useful feature to LibreOffice is to work on the code base however. Overall this way makes it easier to compile and build your code, it avoids any arbitrary limitations of our scripting APIs, and in general is far more simple and intuitive - if you are a reasonably able C++ programmer.
The build chain and runtime baselines
These are the current minimal operating system and compiler versions to run and compile LibreOffice, also used by the TDF builds:
- Windows:
- Runtime: Windows 7
- Build: Cygwin + Visual Studio 2017
- macOS:
- Runtime: 10.10
- Build: 10.13.2 + Xcode 9.3
- Linux:
- Runtime: RHEL 6 or CentOS 6
- Build: either GCC 7.0.0; or Clang 5.0.2 with libstdc++ 7.3.0
- iOS (only for LibreOfficeKit):
- Runtime: 11.4 (only support for newer i devices == 64 bit)
- Build: Xcode 9.3 and iPhone SDK 11.4
If you want to use Clang with the LibreOffice compiler plugins, the minimal version of Clang is 5.0.2. Since Xcode doesn't provide the compiler plugin headers, you have to compile your own Clang to use them on macOS.
You can find the TDF configure switches in the distro-configs/ directory.
To setup your initial build environment on Windows and macOS, we provide the LibreOffice Development Environment (LODE) scripts.
For more information see the build instructions for your platform in the TDF wiki.
The important bits of code
Each module should have a README file inside it which has some
degree of documentation for that module; patches are most welcome to
improve those. We have those turned into a web page here:
However, there are two hundred modules, many of them of only peripheral interest for a specialist audience. So - where is the good stuff, the code that is most useful. Here is a quick overview of the most important ones:
| Module | Description |
|---|---|
| sal/ | this provides a simple System Abstraction Layer |
| tools/ | this provides basic internal types: 'Rectangle', 'Color' etc. |
| vcl/ | this is the widget toolkit library and one rendering abstraction |
| framework | UNO framework, responsible for building toolbars, menus, status bars, and the chrome around the document using widgets from VCL, and XML descriptions from /uiconfig/ files |
| sfx2/ | legacy core framework used by Writer/Calc/Draw: document model / load/save / signals for actions etc. |
| svx/ | drawing model related helper code, including much of Draw/Impress |
Then applications
| Module | Description |
|---|---|
| desktop/ | this is where the 'main' for the application lives, init / bootstrap. the name dates back to an ancient StarOffice that also drew a desktop |
| sw/ | Writer |
| sc/ | Calc |
| sd/ | Draw / Impress |
There are several other libraries that are helpful from a graphical perspective:
| Module | Description |
|---|---|
| basegfx/ | algorithms and data-types for graphics as used in the canvas |
| canvas/ | new (UNO) canvas rendering model with various backends |
| cppcanvas/ | C++ helper classes for using the UNO canvas |
| drawinglayer/ | View code to render drawable objects and break them down into primitives we can render more easily. |
Rules for #include directives (C/C++)
Use the "..." form if and only if the included file is found next to the
including file. Otherwise, use the <...> form. (For further details, see the
mail Re: C[++]: Normalizing include syntax ("" vs
<>).)
The UNO API include files should consistently use double quotes, for the benefit of external users of this API.
loplugin:includeform (compilerplugins/clang/includeform.cxx) enforces these rules.
Finding out more
Beyond this, you can read the README files, send us patches, ask
on the mailing list libreoffice@lists.freedesktop.org (no subscription
required) or poke people on IRC #libreoffice-dev on irc.freenode.net -
we're a friendly and generally helpful mob. We know the code can be
hard to get into at first, and so there are no silly questions.