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KDDockWidgets/README-bindings.md
Allen Winter 917dbf09f6 README.md, README-bindings.md - breakout python bindings readme.
The python bindings info is getting long and detailed
so move to its own README.
2021-05-10 12:56:59 -04:00

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These are the instructions for building the Python bindings for KDDockWidgets.
Make sure you have PySide2, shiboken2 and shiboken2-generator installed.
As this time, you cannot get shiboken2-generator because the wheels are not on PyPi.
To use the wheels do this:
```
% pip3 install \
--index-url=http://download.qt.io/official_releases/QtForPython/ \
--trusted-host download.qt.io \
shiboken2 pyside2 shiboken2_generator
```
For more info visit https://doc.qt.io/qtforpython/shiboken2/gettingstarted.html
afterwards run 'pip3 list | grep PySide2'
Note the version *must* match the same Qt you intend to use when building KDDockWidgets.
Not supported:
- Debug builds
- static builds
- python2 bindings
- only some 32-bit platforms are supported. see https://wiki.qt.io/Qt_for_Python
Tell CMake to build the bindings by passing the `-DKDDockWidgets_PYTHON_BINDINGS=True' option,
followed by the make command.
The bindings will be installed to the passed `-DCMAKE_INSTALL_PREFIX`, which
might require setting the `PYTHONPATH` env variable to point to that path when
running applications. Alternatively, configure the bindings install location
by passing `-DKDDockWidgets_PYTHON_BINDINGS_INSTALL_PREFIX=/usr/lib/python3.8/site-packages`
to CMake (adjust to the python path on your system).
To run the KDDW python example
```
$ export PYTHONPATH=/kddw/install/path # Only if needed
$ cd python/examples/
$ rcc -g python -o rc_assets.py ../../examples/dockwidgets/resources_example.qrc
$ python3 main.py
```
Build Issues
* If you see errors like "Unable to locate Clang's built-in include directory"
then first make sure you have llvm installed. If you still have problems try
setting the environment variable `LLVM_INSTALL_DIR` to point to your llvm installation.
Examples:
```
export LLVM_INSTALL_DIR=/usr/local/opt/llvm-11
set "LLVM_INSTALL_DIR=C:\Program Files\LLVM" #Windows
```
* When building the examples you may encounter errors loading shared libraries from shiboken2_generator.
Try:
```
export LD_LIBRARY_PATH=/usr/local/lib/python/dist-packages/PySide2/Qt/lib #linux
export DYLD_LIBRARY_PATH=/usr/local/lib/python/dist-packages/PySide2/Qt/lib #Mac
#adjust to wherever your PySide is installed
```
* On Windows the `libclang.dll` that ship with QtForPython is not compatible with MSVC2019.
To fix this, copy the `libclang.dll` that comes with llvm into shiboken2, like so:
```
cd C:\Python37\Lib\site-packages\shiboken2_generator
copy libclang.dll libclang.dll.save
copy "C:\Program Files\llvm\bin\libclang.dll" libclang.dll
#Python3 installation in C:\Python37 and llvm in c:\Program Files\llvm. adjust as needed
```