Hello all!
I have written lots of code in Qt3/C++ and am evaluating PyQt4 for a new
project right now. However, I encountered a strange behaviour, that I can not
explain (code at the bottom of this post): It seems to me, that the signals
and slots are acting rather unpedictable:
I have a simple widget with three QLineEdits and connect the signal
textEdited(QString) to my slots. In the slots I set the new text of the
lineedit to a data class (and print them).
If I enter 'a', 'b' and 'c' in the fields labelled 'a', 'b', 'c', I would have
expected to see something like this:
a:None:None
a:b:None
a:b:c
But I get:
a:None:None
b:b:None
c:c:c
Could anybody be so kind and hit me with a cluebat?
Thank you!
Here is the code:
#!/usr/bin/python
from PyQt4.QtGui import *
from PyQt4.QtCore import *
import sys
""" A Simple test data class """
class Data:
def __init__(self, a=None, b=None, c=None):
self.a = a
self.b = b
self.c = c
def __str__(self):
return "%s:%s:%s" % (self.a, self.b, self.c)
""" A Test widget """
class Widget(QWidget):
def __init__(self):
QWidget.__init__(self, None)
self.data = Data()
aw = QLineEdit(self)
bw = QLineEdit(self)
cw = QLineEdit(self)
l = QGridLayout(self)
l.addWidget(QLabel("a", self), 0, 0)
l.addWidget(aw, 0, 1)
l.addWidget(QLabel("b", self), 1, 0)
l.addWidget(bw, 1, 1)
l.addWidget(QLabel("c", self), 2, 0)
l.addWidget(cw, 2, 1)
self.setLayout(l)
self.connect(aw, SIGNAL("textEdited(QString)"), self.onAChange)
self.connect(bw, SIGNAL("textEdited(QString)"), self.onBChange)
self.connect(cw, SIGNAL("textEdited(QString)"), self.onCChange)
def onAChange(self, txt):
self.data.a = txt
print "onAChange: %s" % self.data
def onBChange(self, txt):
self.data.b = txt
print "onBChange: %s" % self.data
def onCChange(self, txt):
self.data.c = txt
print "onCChange: %s" % self.data
if "__main__" == __name__:
app = QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
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