Hi,
I encounter a problem using "emit" method of a signal as a slot of
another signal. Problem occurs using "disconnect".
Here is sample code, 'ok' and 'cancel' inherit from QAbstractButton:
ok.pressed.connect(cancel.pressed.emit)
ok.pressed.disconnect(cancel.pressed.emit)
The second statement raise an exception:
"TypeError: 'builtin_function_or_method' object is not connected"
Calling "disconnect" without parameter works fine.
If I use an intermediate function, TypeError is not raised:
def reemit():
cancel.pressed.emit()
ok.pressed.connect(reemit)
ok.pressed.disconnect(reemit)
Behaviour is the same with old style signals.
Is there a way to not use an intermediate function ?
sip: 4.12.4
PyQt: 4.8.3
Qt: 4.7.3
Test cases in attachment.
Thanks,
Pierre-Louis
#!/usr/bin/python
from sys import argv
from PyQt4.QtGui import QDialog, QDialogButtonBox, QApplication
from PyQt4.QtCore import pyqtSlot, SIGNAL
@pyqtSlot()
def cancel_callback():
print "cancel_callback"
def create_widgets():
dialog = QDialog()
box = QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel, parent=dialog)
ok = box.button(QDialogButtonBox.Ok)
cancel = box.button(QDialogButtonBox.Cancel)
cancel.pressed.connect(cancel_callback)
return dialog, ok, cancel
def test1(dialog, ok, cancel):
"""new style signal using disconnect without parameter"""
ok.pressed.connect(cancel.pressed.emit)
ok.pressed.disconnect()
# ok no problem here
def test2(dialog, ok, cancel):
"""new style signal using disconnect with emit"""
ok.pressed.connect(cancel.pressed.emit)
ok.pressed.disconnect(cancel.pressed.emit)
# raise "TypeError: 'builtin_function_or_method' object is not connected"
def test3(dialog, ok, cancel):
"""new style signal using disconnect with an intermediate function"""
def reemit():
cancel.pressed.emit()
ok.pressed.connect(reemit)
ok.pressed.disconnect(reemit)
# ok
def test4(dialog, ok, cancel):
"""old style signal using disconnect with emit"""
ret = ok.connect(ok, SIGNAL('pressed()'), cancel.pressed.emit) # -> return True
assert ret, "connect failed"
ret = ok.disconnect(ok, SIGNAL('pressed()'), cancel.pressed.emit) # -> return False
assert ret, "disconnect failed"
def test5(dialog, ok, cancel):
"""old style signal using disconnect with an intermediate function"""
def reemit():
cancel.pressed.emit()
ret = ok.connect(ok, SIGNAL('pressed()'), reemit) # -> return True
assert ret, "connect failed"
ret = ok.disconnect(ok, SIGNAL('pressed()'), reemit) # -> return True
assert ret, "disconnect failed"
if __name__ == "__main__":
app = QApplication(argv)
for test in test1, test2, test3, test4, test5:
print test.__doc__
try:
dialog, ok, cancel = create_widgets()
test(dialog, ok, cancel)
except Exception, err:
print "'ok' button: signal not disconnected"
print "'%s' failed: '%s'" % (test, err)
else:
print "'ok' button: signal disconnected"
print "'%s' successful" % test
dialog.exec_()
print ""
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