[PyQt] Defining a custom slot in Designer

[David Boddie]

On Sat Jan 17 17:19:44 GMT 2009, Henrik Pauli wrote:

> I was messing around in Designer today and I wanted to add my QMainWindow
> a new slot.  The ui file has it, but the moment I try to loadUi it, I get
> the following:
>
> Traceback (most recent call last):
>  File "./testclient.py", line 11, in <module>
>  w = uic.loadUi("testclient.ui")
>  File "/usr/lib/python2.6/site-packages/PyQt4/uic/__init__.py", line 106,
> in loadUi
>  return loader.DynamicUILoader().loadUi(uifile, baseinstance)

[...]

>  File
> "/usr/lib/python2.6/site-packages/PyQt4/uic/Loader/qobjectcreator.py", line
> 75, in getSlot
>  return getattr(object, slotname)
> AttributeError: executeCommand
>
> So how do I add this to my widget?

How did you add the slot to the testclient.ui file?

> Of course, I could work around this by doing all of it in python instead of
> Designer, but I wonder if this is possible at all.

You could use auto-connection to connect signals from objects in the .ui
file to slots you define in a Python implementation, but you need to use
pyuic4 to generate code for a class, and derive a new subclass from this in
Python. The new slots also have to follow a naming convention.

http://doc.trolltech.com/4.4/designer-using-a-component.html#automatic-connections

I'm not aware of a mechanism that lets you add slots to .ui files loaded
at run-time, unless you use uic.loadUiType() to create a widget class from
which you can derive a new subclass . You would presumably be able to write
the code for the new slots in the subclass.

Maybe you can give some more information about what you're trying to do.

David