https://github.com/nithanim/java-gtk-demo
https://github.com/nithanim/java-gtk-demo
Last synced: 11 months ago
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- Host: GitHub
- URL: https://github.com/nithanim/java-gtk-demo
- Owner: Nithanim
- Created: 2022-04-06T17:01:58.000Z (about 4 years ago)
- Default Branch: master
- Last Pushed: 2022-04-06T17:10:05.000Z (about 4 years ago)
- Last Synced: 2025-06-26T19:03:41.335Z (11 months ago)
- Language: Java
- Size: 1.92 MB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Java GTK3 demo
This repository is a demo of using jextract to generate panama ffi bindings for GTK3.
## jextract
To use jextract, we need pass it a header file to generate the bindings from.
We can do it the easy way like
```C
#include
```
Sadly, jextract is not really "intelligent" so we have to tell it where all the stuff of gtk and all the libraries it depends on can be found.
(It is assumed you have the development packages of GTK installed on your system.)
Fortunately, there is `pkg-config` which can resolve everything and give us all the include-paths we need.
A sample output on Ubuntu with `pkg-config --cflags gtk+-3.0`:
```
-pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/harfbuzz -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/x86_64-linux-gnu -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
```
We have to remove the `-pthread` from the list, but otherwise we can put it directly to use.
`./jextract -I/usr/include/gtk-3.0 <...> -I/usr/include/at-spi2-atk/2.0 --source -t gtk3 test.h
`
The `-source` flag makes generates java sources instead of class files directly.
This is easier if you are playing around or want it use in a maven artifact because you just put in the source folder (or generated-sources) and use it directly.
The downside is that with A LOT of functions, the source gets quite large and (for now) a big serial hierarchy of classes filled with methods is created, which IntelliJ does NOT like.
JavaC is also working very hard on them.
It might be better if the code is pre-compiled in a separate maven dependency and then included in you actual project but it could be equally bad.
My hope is that `jextract` stops to produce the weird class hierarchy at some point.
The `-t ` flag controls the destination packages for the generated classes.
The `-l ` flag instructs jextract to call `System.loadLibrary("