Hi everyone,
I have connected the signal selectionChanged so some code, which is executed
after features are selected.
myLayer.selectionChanged.connect(self.executeAfterSelection)
Then I have a method self. executeAfterSelection(self, featuresIds)
The SIGNAl/SLOT tandem works but now I realized every time when I call
myLayer.selectionChanged.connect(self.executeAfterSelection) It does not
overwrite my previous call. It creates a second signa/slot tandem. During
running the method executeAfterSelection is excuted twice, three times etc.
How can I check if the SIGNAL selectionChanged is connected to the slot
executeAfterSelection before I run
myLayer.selectionChanged.connect(self.executeAfterSelection)?
I tried this:
receiversCount = QtCore.QObject.receivers(QtCore.SIGNAL("selectionChanged()")
receiversCount = QtCore.QObject.receivers(QtCore.SIGNAL("selectionChanged")
receiversCount =
QtCore.QObject.receivers(QtCore.SIGNAL("myLayer.selectionChanged()")
receiversCount =
QtCore.QObject.receivers(QtCore.SIGNAL("myLayer.selectionChanged")
Every time I get this error:
QObject.receivers(SIGNAL()): first argument of unbound method must have type
'QObject').
Thanks,
Marian
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