CODEWITHSUNDEEP
pythonpython-3.xgtkpygobject
Suhas
Suhas

Reputation: 131

How to have an accumulator for a signal in PyGObject?

I have a class which inherits from GObject. I need to emit a signal and stop when I receive a non-None result from any callback.

Something like this..

    class A(GObject.Object):
     __gsignals__ = {'get_my_object':(GObject.SIGNAL_RUN_LAST, subClassGObject, (int,))}

     def get_the_object(self):
      my_obj = self.emit('get_my_object')

Among the callbacks which ever returns the first non-None result that should be stored in my_obj, I don't know if this has to do with some kind of an 'accumulator' function. How do I get this done in pygtk?

Upvotes: 1

Views: 163

Answers (1)

ptomato
ptomato

Reputation: 57880

If you use the @GObject.Signal decorator, you can pass it an accumulator parameter. Documentation is here: https://github.com/GNOME/pygobject/blob/b2529624b3925adbef2671025e08cbf747f162e8/gi/_signalhelper.py#L49

@GObject.Signal(accumulator=GObject.signal_accumulator_first_wins)
def my_signal(self):
    return None

Upvotes: 1

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