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I don't think static means constant across *time*, it just should mean
constant across instances of the class,<br>
i.e. you *can* change the metaobject while it's running... :-)<br>
<br>
And that's the way TCL/Qt will work (when I finally find the time to
sit down and actually write it).<br>
<br>
The Qt runtime calls the metaobject stuff all the time, so I don't
think it caches the answers it gets back...<br>
<br>
And there you go, done addition of methods at runtime: just reimplement
all the stuff with an added "addMethod()" method that will insert your
new method in some data structure and you're done.<br>
<br>
Now, I obviously haven't tried it... :-)<br>
<br>
My 2 cents<br>
Luca<br>
<br>
Eric Jardim wrote:
<blockquote cite="mid432ec6c50508302233514a0a43@mail.gmail.com"
type="cite">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>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Luca Fascione
Pipeline Engineer - Weta Digital
+644 380 9170 (x4855) / +64 21 0764 862
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