Michael Weghorn
faa48de3f8
Earlier commit
Change-Id: Ib42c40ddf858d6e7b930a2b51620ff9f51440141
Author: Michael Weghorn <m.weghorn@posteo.de>
Date: Wed Jul 22 10:02:09 2026 +0200
tdf#130857 qt weld: Signal about QtInstanceWidget size change
implemented signalling about widget size changes.
For QtInstanceTreeView, additionally handle resize
events of its viewport and signal about those changes
as well.
This is required for the case where code connects a
handler to that signal using weld::Widget::connect_size_allocate
and the handler calls weld::TreeView::visible_foreach which
relies on the viewport already having been resized to the new
size, not only its QTreeView parent.
This addresses the remaining issue mentioned in previous
commit
Change-Id: Ie19766c7436f6d3f8a55e5df2c1e8c824f8c3f06
Author: Michael Weghorn <m.weghorn@posteo.de>
Date: Wed Jul 22 10:38:20 2026 +0200
tdf#130857 qt weld: Signal when treeview is scrolled
Call weld::TreeView::signal_visible_range_changed
when the treeview is scrolled vertically, i.e. the value of
its vertical scrollbar changes, which results in other
entries being visible in the viewport.
This addresses a part of the issue mentioned in previous
commit
Change-Id: Iae7edecbdc7280473bb7370e8a3bb4c677a53fc8
Author: Michael Weghorn <m.weghorn@posteo.de>
Date: Wed Jul 22 10:32:46 2026 +0200
tdf#130857 qt weld: Support Calc "Manage Names" dialog
This means that native Qt widgets are used for this dialog
now when using the qt5 or qt6 VCL plugin and starting LO with
environment variable SAL_VCL_QT_USE_WELDED_WIDGETS=1 set.
The dialog can be triggered like this:
* start Calc
* select cells A1:B4
* "Sheet" -> "Named Ranges and Expressions" -> "Manage..."
Some logic to update the data for the entries in
the dialog (that can be added using "Sheet"
-> "Named Ranges and Expressions" -> "Define...")
is not yet triggered, so the "Range or formula expression" column
isn't filled with data as needed yet when there are multiple
entries. This will be addressed in an upcoming commit.
Now, the "Range or formula expression" column is
filled for all currently visible entries when
scrolling.
One remaining problem (that will be addressed in a separate
commit) is that the column is not yet filled for all
existing entries when the dialog shows, but before
any scrolling has happened.
An alternative solution could be to call
weld::TreeView::signal_visible_range_changed
to directly indicate that the visible range has
changed instead of signalling about the size change.
The GTK implementation however only calls that signal
when the scrolling position changed, so adhere to
that logic in the Qt implementation as well for now.
Change-Id: I82aeeef41d74a1ef89d09c64ea579586dcf77442
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/208458
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.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 and Developers Guide. 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 10
- Build: wsl-as-helper + Visual Studio 2022
- macOS:
- Runtime: 11
- Build: 13 or later + Xcode 14.3 or later (using latest version available for a given version of macOS)
- Linux:
- Runtime: RHEL 9 or CentOS 9 and comparable
- Build: either GCC 13; or Clang 18 with libstdc++ 11
- iOS (only for LibreOfficeKit):
- Runtime: 14.5 (only support for newer i devices == 64 bit)
- Build: Xcode 12.5 and iPhone SDK 14.5
- Android:
- Build: NDK 27 and SDK 30.0.3
- Emscripten / WASM:
- Runtime: a browser with SharedMemory support (threads + atomics)
- Build: Qt 5.15 with Qt supported Emscripten 1.39.8
- See README.wasm
Java is required for building many parts of LibreOffice. In TDF Wiki article Development/Java, the exact modules that depend on Java are listed.
The baseline for Java is Java Development Kit (JDK) Version 17 or later.
The baseline for Python is version 3.11. It follows the version available in SUSE Linux Enterprise Desktop and the Maintenance Support version of Red Hat Enterprise Linux.
If you want to use Clang with the LibreOffice compiler plugins, the minimal version of Clang is 18. 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.md 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.md 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.libera.chat -
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.
SAST Tools
PVS-Studio - static analyzer for C, C++, C#, and Java code.