Re: [PyQt] QCheckBox problem
Doug Hackworth wrote: FoobarApplication is calling the wrong super-class __init__. Duly noted, thanks for the correction. I changed it to call QtGui.QMainWindow.__init__() instead. The change produced no visible effect, but I assume it's a better initialization to call, so thanks for pointing this out. Use the stateChanged(int) signal instead. That did the trick, thanks! Question: Was I wrong to use the toggled() signal and should have known to use stateChanged(int) instead? What's the difference between the two? The toggled signal is defined as: void QAbstractButton::toggled ( bool checked ) Use QtCore.SIGNAL(toggled(bool)) instead of QtCore.SIGNAL(toggled()) and it will work as expected. Because a QCheckBox can be a tri-state checkbox , it's better to use stateChanged(int) instead of toggled(bool). Ulli ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] QCheckBox problem
If that isn't the problem, it'd help someone to figure it out if you
could provide a complete small executable program that exhibits the
problem behavior.
Attached is an example program which illustrates the problem I'm having. Again,
the QCheckBox seems to work (its isChecked() method returns the correct thing,
for example), but there is no action from the slot function that I have
(ostensibly) connected to its toggled() signal.
I'm not a Qt or PyQt expert yet, so perhaps I've overlooked something
elementary. Any insights from this list's collected wisdome would be quite welcome.
Many thanks,
Doug
#! /usr/bin/python
import sys
from PyQt4 import QtCore, QtGui
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(MainWindow)
MainWindow.resize(QtCore.QSize(QtCore.QRect(0,0,433,181).size()).expandedTo(MainWindow.minimumSizeHint()))
MainWindow.setBaseSize(QtCore.QSize(0,0))
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(centralwidget)
self.buttonSubmit = QtGui.QPushButton(self.centralwidget)
self.buttonSubmit.setGeometry(QtCore.QRect(210,120,101,27))
self.buttonSubmit.setObjectName(buttonSubmit)
self.buttonQuit = QtGui.QPushButton(self.centralwidget)
self.buttonQuit.setGeometry(QtCore.QRect(330,120,80,27))
self.buttonQuit.setObjectName(buttonQuit)
self.textFilename = QtGui.QLineEdit(self.centralwidget)
self.textFilename.setEnabled(False)
self.textFilename.setGeometry(QtCore.QRect(30,70,340,29))
self.textFilename.setObjectName(textFilename)
self.checkAddFile = QtGui.QCheckBox(self.centralwidget)
self.checkAddFile.setGeometry(QtCore.QRect(30,30,251,23))
self.checkAddFile.setObjectName(checkAddFile)
MainWindow.setCentralWidget(self.centralwidget)
self.statusbar = QtGui.QStatusBar(MainWindow)
self.statusbar.setObjectName(statusbar)
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QObject.connect(self.buttonQuit,QtCore.SIGNAL(clicked()),MainWindow.close)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(QtGui.QApplication.translate(MainWindow, foobar, None, QtGui.QApplication.UnicodeUTF8))
self.buttonSubmit.setText(QtGui.QApplication.translate(MainWindow, Do Things, None, QtGui.QApplication.UnicodeUTF8))
self.buttonQuit.setText(QtGui.QApplication.translate(MainWindow, Quit, None, QtGui.QApplication.UnicodeUTF8))
self.checkAddFile.setText(QtGui.QApplication.translate(MainWindow, This is a checkbox:, None, QtGui.QApplication.UnicodeUTF8))
class FoobarApplication(QtGui.QMainWindow):
def __init__(self, parent=None):
# Set up the GUI from the Qt Designer code...
QtGui.QWidget.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
# Connect signals and slots...
# Submit button
QtCore.QObject.connect(self.ui.buttonSubmit, QtCore.SIGNAL(clicked()), self.Submit)
# Checkbox
QtCore.QObject.connect(self.ui.checkAddFile, QtCore.SIGNAL(toggled()), self.CheckMultiMask)
# Slot for Submit button
def Submit(self):
filename = str(self.ui.textFilename.text())
fAddFile = self.ui.checkAddFile.isChecked()
sys.stdout.write('%s ... %s \n' % (fAddFile, filename))
# Slot for checkbox
def CheckMultiMask(self):
sys.stdout.write(multimask toggleded\n)
if (self.ui.checkMultiMask.isChecked()):
sys.stdout.write(it's checked\n)
self.ui.textFilename.setEnabled(True)
if __name__ == __main__:
app = QtGui.QApplication(sys.argv)
myapp = FoobarApplication()
myapp.show()
sys.exit(app.exec_())
___
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Re: [PyQt] QCheckBox problem
FoobarApplication is calling the wrong super-class __init__. Duly noted, thanks for the correction. I changed it to call QtGui.QMainWindow.__init__() instead. The change produced no visible effect, but I assume it's a better initialization to call, so thanks for pointing this out. Use the stateChanged(int) signal instead. That did the trick, thanks! Question: Was I wrong to use the toggled() signal and should have known to use stateChanged(int) instead? What's the difference between the two? Thanks again, Doug ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] QCheckBox problem
Greetings. This should be an easy one for someone to answer. Simple situation: I have a QCheckBox on a main window along with other widgets, but mysteriously it won't do anything. Since all my other widgets (buttons, mainly) do what they're supposed to, I suspect I am using the QCheckBox incorrectly. It's the first time I've tried using one. I am attempting to connect the checkbox's toggled() signal to a slot with this line: code QtCore.QObject.connect(self.ui.checkMyCheckbox, QtCore.SIGNAL(toggled()), self.MyCheckboxSlotFunction) /code Here is the slot I have defined for it: code def CheckMultiMask(self): sys.stdout.write(checkbox toggleded\n) if (self.ui.checkMyCheckbox.isChecked()): sys.stdout.write(it's checked\n) /code When the window loads, however, I can click on the QCheckBox all I want, to no avail. Also, the application object doesn't complain when it loads, and I know it's getting to the connect() invocation quoted above... I just don't know why the slot function doesn't seem to ever be invoked. And again, my other widgets with signals/slots connected by me (in a manner like that above) are behaving as expected. Any thoughts from the experts? I'll be happy to provide further information on context if it's useful. BTW, I'm using Ubuntu 7.10 and the following versions of PyQt / Qt: $ pyuic4 --version Python User Interface Compiler 4.3 for Qt version 4.3.2 (The MainWindow was constructed with Qt Designer by way of pyuic4.) Thanks, Doug ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] QCheckBox problem
On Sunday 04 January 2009 17:30:41 pm Doug Hackworth wrote: Greetings. This should be an easy one for someone to answer. Simple situation: I have a QCheckBox on a main window along with other widgets, but mysteriously it won't do anything. Since all my other widgets (buttons, mainly) do what they're supposed to, I suspect I am using the QCheckBox incorrectly. It's the first time I've tried using one. I am attempting to connect the checkbox's toggled() signal to a slot with this line: code QtCore.QObject.connect(self.ui.checkMyCheckbox, QtCore.SIGNAL(toggled()), self.MyCheckboxSlotFunction) /code Here is the slot I have defined for it: code def CheckMultiMask(self): sys.stdout.write(checkbox toggleded\n) if (self.ui.checkMyCheckbox.isChecked()): sys.stdout.write(it's checked\n) /code When the window loads, however, I can click on the QCheckBox all I want, to no avail. Also, the application object doesn't complain when it loads, and I know it's getting to the connect() invocation quoted above... I just don't know why the slot function doesn't seem to ever be invoked. And again, my other widgets with signals/slots connected by me (in a manner like that above) are behaving as expected. Any thoughts from the experts? I'll be happy to provide further information on context if it's useful. BTW, I'm using Ubuntu 7.10 and the following versions of PyQt / Qt: $ pyuic4 --version Python User Interface Compiler 4.3 for Qt version 4.3.2 (The MainWindow was constructed with Qt Designer by way of pyuic4.) If the code you've provided is what you actually have, you haven't connected the signal to the slot you show - instead of self.MyCheckboxSlotFunction, you should be connecting to self.CheckMultiMask. If that isn't the problem, it'd help someone to figure it out if you could provide a complete small executable program that exhibits the problem behavior. Jim ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] QCheckBox problem
If the code you've provided is what you actually have, you haven't connected the signal to the slot you show - instead of self.MyCheckboxSlotFunction, you should be connecting to self.CheckMultiMask. Darn it. Editing problem, not a coding problem. I was renaming my variables/functions to generic names for the purpose of illustrating my problem to the mailing list, and missed one. In the context of my provided example, the slot function should really be: def MyCheckboxSlotFunction(self): (etc) Sorry for the confusion. If that isn't the problem, it'd help someone to figure it out if you could provide a complete small executable program that exhibits the problem behavior. Sure, I'll do that. It will follow this message (perhaps not immediately). Thanks, Doug ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
