On Thu, 9 Nov 2006, Andreas Pakulat wrote:
On 09.11.06 16:43:00, Sibylle Koczian wrote:
hopefully the subject line isn't too misleading. This is my problem: I
would like to connect the "clicked" signal of several buttons to one
and the same function - but this function should know which button sent
the signal. Example: one button to increase a value, another to
decrease it, and one single function which adds '+1' or '-1' depending
on the sending button. Or a row of buttons with a letter, and clicking
one searches for all words beginning with this letter in a list.
How can I do this? Subclassing QPushButton seems to be a possibility,
but is there a simpler way?
The unclean solution would be to use the sender() function, the proper
one is to have a look at QSignalMapper.
An alternative pythonic way to do this is to do something like:
class BoundCaller(object):
"""A callable class to wrap a function and its arguments."""
def __init__(self, fn, *params):
self.fn = fn
self.params = params
def __call__(self, *params):
self.fn( *(self.params+params) )
in your class:
def __init__(self):
self.myslot1 = BoundCaller(myslot, 1)
self.myslot2 = BoundCaller(myslot, 2)
self.connect(self.mybutton, SIGNAL('clicked()'), self.myslot1)
...
def myslot(self, boundarg):
print boundarg
You have to keep a separate reference to the BoundCaller object (hence the
assignment to self), otherwise it gets garbage collected.
Jeremy
--
Jeremy Sanders <[EMAIL PROTECTED]>
http://www.jeremysanders.net/ Cambridge, UK
Public Key Server PGP Key ID: E1AAE053
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