On Monday 04 November 2002 05:59 am, Kaleb Pederson wrote:
> Thanks. Although it isn't usually necessary, it will be nice to have.
> There is a bug in PyQt with respect to connections being removed when the
> associated object has been deleted. But I'll try to post some example code
> within the week.
>
> Basically, if I create a parentless object and connect signals to it. Upon
> deletion of the object, any signals that would thereafter have gone to it
> result in a sip runtime error saying the C++ object has been deleted.
I just posted a message on the list and forgot to include an attachment. Here
it is.
--Kaleb
#!/usr/bin/python
from qt import *
import sys
class MyDialog(QDialog):
def __init__(self,id = 0,parent = None,name = "MyDialog",modal=0,fl=0):
QDialog.__init__(self,parent,name,modal,fl)
self.id = id
self.count = 0
self.keep_ref = {}
self.setCaption("Testing" + str(id))
main_layout = QVBoxLayout(self,11,6,"main_layout")
self.button1 = QPushButton(self,"button1")
self.button1.setText(u'&Launch')
main_layout.addWidget(self.button1)
self.connect(self.button1,SIGNAL("clicked()"),self.launch)
self.button2 = QPushButton(self,"button2")
self.button2.setText(u'&Fire')
main_layout.addWidget(self.button2)
self.connect(self.button2,SIGNAL("clicked()"),self.fire)
self.button3 = QPushButton(self,"button3")
self.button3.setText(u'&Quit')
main_layout.addWidget(self.button3)
self.connect(self.button3,SIGNAL("clicked()"),self,SLOT("accept()"))
def caught(self):
print "dlg %i caught 'fire()' signal" % self.id
def fire(self):
self.emit(PYSIGNAL("fire()"), () )
def closeEvent(self,event):
print "dlg %i is closing" % self.id
self.emit(PYSIGNAL("closing(id)"),(self.id,))
event.accept()
def accept(self):
self.emit(PYSIGNAL("closing(id)"),(self.id,))
QDialog.accept(self)
def cleanup(self,id):
print "cleaning up id %i" % id
if id in self.keep_ref.keys():
del self.keep_ref[id]
print "references remaining:",self.keep_ref
def launch(self):
# keep a reference so it doesn't get destroyed
dlg = MyDialog(self.count) # no parent
self.connect(self,PYSIGNAL("fire()"),dlg.caught)
# it works fine unless this signal is connected
self.connect(self,PYSIGNAL("fire()"),dlg, SLOT("close()"))
self.connect(dlg,PYSIGNAL("closing(id)"),self.cleanup)
self.keep_ref[self.count] = dlg
self.count += 1
dlg.show()
qapp = QApplication(sys.argv)
mw = MyDialog()
qapp.setMainWidget(mw)
mw.show()
sys.exit(mw.exec_loop())
