On 13/04/2007 19.45, Matt Newell wrote:
On Friday 13 April 2007 09:43, Gerard Vermeulen wrote:
If you are using a version of PyQt before 4.2, you cannot really use
PyQt widgets like this because they do not respond to events, since
their is no event loop (you did not call yourQApplication._exec()).
PyQwt has a module 'iqt' that fakes an event loop in combination with
the readline module, see
http://pyqwt.sourceforge.net/doc5/iqt-intro.html
I think that PyQt-4.2 has also half the facility of faking the event
loop: you still have to use the readline module (this is what I think,
I did not test it) to make sure that events are handled.
Anyhow, if you want to use PyQt from the interpreter, I recommend
the use of a Python startup file as explained in iqt-intro.html.
You don't need to call QApplication::exec to have an event loop. A local
event loop is created automatically whenever you call QMenu::exec,
QDialog::exec or one of the static QMessageBox methods. You still need a
QApplication of course.
Yes, but the point is that, since PyQt 4.2, the event loop is always running
in *background* at the interpreter prompt. So you can construct a complex
widget, show() it and interact with it without ever calling exec() explicitly.
It's much handier for quick sessions.
This new feature didn't make it to the NEWS file though. I guess Phil didn't
think it was important enough.
--
Giovanni Bajo
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