2005/8/31, Marcus <<a href="mailto:mathpup@mylinuxisp.com">mathpup@mylinuxisp.com</a>>:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I would like to hear more about this because getting signals and slots working<br>seems to be one of the hardest parts. I understand that Qt 4.x makes some<br>changes, but I also gather that there is still a great deal of voodoo in the
<br>moc-generated code.</blockquote><div><br>
Well, actually, signals and slots are working normally in python-qt4. I
used a simple approach. I created dispatcher classes for each type of
slot. It is impossible to connect a signal to a Python function. There
must be a C++ slot. So I have a dispatcher class for every possible
signature ex:<br>
PythonSlot_int_int -> void slot(int, int)<br>
and so on. Of course I have a script that write this code for me. You
just have to say (textualy) which signatures you want to generate.<br>
<br>
It is the only way I see to make it works. The limitation of this
approach are new types of slot signatures. Well, we can solve this
creating a central registry for slot dispachers. Hey, remember now...
I've made this :) But needs more testing.<br>
</div>Returning to MOC, I just need to play with it, only because
if I want to run Python extended classes (of QObject/QWidget) on C++
(like embedded C++ or using Python objects in QtDesigner). I am studing
it, but I am not very sure that it will work. <br>
<br>
The problem is that the C++ metaobject is static. We need dynamic metaobjects! And that is the whole trick.<br>
<br>
<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">When I have worked on schemes to interact with signals and slots, I have<br>always been torn between using things are not part of the Qt API whose
<br>details can only be discovered by reading the files that moc generates OR<br>writing portable but complicated, bulky code with a great deal of potential<br>overhead. Qt goes to great lengths to make C++ less dangerous for
<br>programmers, but many of the techniques used make it difficult for non-C++<br>languages to use Qt.<br></blockquote></div><br>
Sure, but I think it is getting better. Try python-qt4 source and see what I did. I'll continue studing the moc files.<br>
<br>
[Eric Jardim]<br>