On Monday 01 August 2011, 22:20:32 Magnus Wirström wrote:
> Hi
>
> I am sorry if this have been asked before :)
>
> I am trying to learn using python and pyqt using ERIC 5.1.2. I have a
> problem with signals and slots. I tried this on 2 different computer
> with different OS and different version of python. My problem is
> this...
>
> I am creating a "test" project using Eric ... using one of the
> tuturials on Eric's webpage. I create a project and a form, then i
> add a push button. I save the form and i generate the form into code
> using Eric I also generate dialog code and adding a slot for my push
> button. So far i have not written a single line of code. In my slot i
> write a print("Hello"), My only self written code. When i run this, i
> get a window with my button but when i click it nothing happens. When
> have i done wrong? How can i get my button to execute the slot?
You should get the "Hello" printed in console on start up, don't you?
See below.
> thanks for the help ... sorry if this is a stupid question ;)
>
> Here is the code:
>
>
> # Form implementation generated from reading ui file
> '/home/magnus/eric/test/testui.ui'
> #
> # Created: Mon Aug 1 22:16:17 2011
> # by: PyQt4 UI code generator 4.8.4
> #
> # WARNING! All changes made in this file will be lost!
>
> from PyQt4 import QtCore, QtGui
>
> try:
> _fromUtf8 = QtCore.QString.fromUtf8
> except AttributeError:
> _fromUtf8 = lambda s: s
>
> class Ui_Dialog(object):
> def setupUi(self, Dialog):
> Dialog.setObjectName(_fromUtf8("Dialog"))
> Dialog.resize(400, 300)
> self.pushButton = QtGui.QPushButton(Dialog)
> self.pushButton.setGeometry(QtCore.QRect(140, 130, 83, 25))
> self.pushButton.setObjectName(_fromUtf8("pushButton"))
>
> self.retranslateUi(Dialog)
> QtCore.QObject.connect(self.pushButton,
> QtCore.SIGNAL(_fromUtf8("clicked()")), Dialog.exec)
> QtCore.QMetaObject.connectSlotsByName(Dialog)
>
> def retranslateUi(self, Dialog):
> Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog",
> "Dialog", None, QtGui.QApplication.UnicodeUTF8))
>
> self.pushButton.setText(QtGui.QApplication.translate("Dialog",
> "PushButton", None, QtGui.QApplication.UnicodeUTF8))
>
>
> if __name__ == "__main__":
> import sys
> app = QtGui.QApplication(sys.argv)
> Dialog = QtGui.QDialog()
> ui = Ui_Dialog()
> ui.setupUi(Dialog)
> Dialog.show()
> sys.exit(app.exec_())
>
>
> ---------------------------------------------------------------------
>----------------------------------------------------------------------
>----------------------------------------------------------------------
>
>
> # -*- coding: utf-8 -*-
>
> """
> Module implementing Dialog.
> """
>
> from PyQt4.QtCore import *
> from PyQt4.QtGui import QDialog
>
> from .Ui_testui import Ui_Dialog
>
> class Dialog(QDialog, Ui_Dialog):
> """
> Class documentation goes here.
> """
> def __init__(self, parent = None):
> """
> Constructor
>
> @param parent reference to the parent widget (QWidget)
> """
> QDialog.__init__(self, parent)
> self.setupUi(self)
> QtCore.QObject.connect(self.pushButton,
> QtCore.SIGNAL(_fromUtf8("clicked()")), self.on_pushButton_clicked())
^^
You're calling the signal handler here, resulting in connecting the
signal to None. While at it, use the "new" style signals/slots:
self.pushButton.clicked.connect(self.on_pushButton_clicked)
Looking much nicer, doesn't it?
("new, as in "only a couple of years old…")
And it should do, what you want, does it?
> @pyqtSlot()
> def on_pushButton_clicked(self):
> """
> Slot documentation goes here.
> """
> print("hello")
Pete
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