From Qt Labs
[edit] Qt Jambi Jython Bindings
As Håvard pointed out in his blog some time ago, Qt Jambi is really a door opener into a number of other languages. Jython for instance, the python implementation done in Java. By just putting the qtjambi.jar files into classpath one can write this code in Jython:
from com.trolltech.qt.gui import *
QApplication.initialize([])
hello = QPushButton("Hello Jython!")
hello.show()
QApplication.exec()
This is pretty neat by itself, but it usually comes to a problem with signals and slots, as we implement these based on reflection of method names. Very few of these scripting solutions produce reflectable methods that we can use, so we need to bridge this gap. This project provides a few classes that solves this problem for jython. Enjoy!
[edit] Building
Run ant, it should automatically pick up the build.xml build description and build a qtjambi-jython.jar file in the current directory. Please note that both Qt Jambi libraries and jython libraries must be in the local path when compiling. It should look something like this:
C:\qtjambi\jython>ant
Buildfile: build.xml
qtjambi-jython.jar:
[mkdir] Created dir: C:\qtjambi\jython\out
[javac] Compiling 13 source files to C:\qtjambi\jython\out
[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.
[jar] Building jar: C:\qtjambi\jython\qtjambi-jython.jar
[delete] Deleting directory C:\qtjambi\jython\out
BUILD SUCCESSFUL
Total time: 2 seconds
C:\qtjambi\jython>
[edit] Running the examples
Be sure that Qt Jambi and jython is set up in the environment and run the minimalist demo:
> jython mybutton.py
or
> jython paint.py
[edit] Known Issue: Accidental private constructor...
Qt Jambi classes, like QWidget have a special constructor that takes a QPrivateConstructor. This constructor is protected and not callable in Java unless the user does something nasty and should he do, it will result in an exception. The problem is that jython won't have the option of selecting between
QWidget(QWidget parent)
and
QWidget(QPrivateConstructor ctor)
The result of this is that the code:
class Fail(QWidget):
def __init__(self, parent):
QWidget.__init__(self, parent)
f1 = Fail(aParent)
f2 = Fail(None)
Will fail in the case f2 because parent is None. I don't have a good solution for this just yet, but I'll see if something comes to mind...
[edit] Latest 5 Qt Jambi Blogs
For those of you who don’t read the new Qt blog website, where Qt Marketing and Product Management talk about “corporatey” stuff (affectionately called the “PHB blog” by our developers), we’ve just announced that our brand, new bugtracker is public: see http://bugreports.qt.nokia.com.
So, I won’t repeat everything that is in the other blog (it is, after […]
Ever since Nokia announced that the official support for Qt Jambi would end after the 4.5 series, I’ve had a few people ask me how they can help adapt the Qt 4.6 changes to Qt Jambi. I thought this blog would be a good place to offer my experiences on the subject, so here’s a […]
It’s taken a little longer than expected, but the nice and polished Qt Jambi 4.5.0_01 packages are finally ready for download on Qt Software’s server. As usual, there are both source and binary packages available, but to match the new licensing of Qt, the GPL packages have been replaced by LGPL packages this time around. […]
With the announcement back in January of Qt going LGPL there was a small piece of information that slipped though the cracks of the wider news reporting, namely the fact that we were planing on opening up our repositories and development model. The first major phase of this work is now complete, and we are […]
A while back we announced the research project Qt Jambi AWT Bridge which allows you to mix AWT/Swing components and Qt widgets in the same window on Windows and Linux.
There were a few issues with the original version. The main problems were the fact that your window would be deactivated by the window manager […]
