Re: [PyQt] Trying to learn ...
Dear BigAl, On Wednesday 03 August 2011, 01:27:55 Algis Kabaila wrote: Hi, Pete! Looking at testui.py it seems to me that it should/would work without the decorator @pyqtSlot(). This suggests two questions: 1. What is the advantage, if any, to use the decorator in this case? In short: none. I opted to mangle Magnus' file in a minimum invasive fashion, and @pyqtSlot was one weapon in his quest to get the thing behave... IMHO, after getting used to it, it's usefulness is two fold: it nicely documents the slots in your classes, and helps to disambiguate/fix those cases, were it is needed. E.g. there are some not so obvious cases in esoteric usage pattern of webkit with javascript/PyQt interaction: http://www.riverbankcomputing.com/pipermail/pyqt/2010-November/028600.html 2. Where could one look up the code for this decorator? http://www.riverbankcomputing.com/static/Docs/PyQt4/html/new_style_signals_slots.html#the-pyqtslot-decorator Thanks for your forever careful care of simple questions - there is nothing simple when one does not know how to get it working! Good work! OldAl. I dimly remember my own PyQt quest ten years ago. ;-) BTW, I talked to someone lately, who was involved in a web based ERP system in about the same time span. Finally, they've given up, since they failed to cope with the need to redesign/rewrite the whole thing for the third time (in order to deal with the html/java/javascript/browser evolution).. I cannot qualify their development process, but I imagine, that sustainability of PyQt code is a couple of magnitudes above that level, even if factoring in sip v2 to v4, (Py)Qt v3 to v4 and python v2 to v3 advancements from that time. Pete ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Trying to learn ...
Magnus, please keep the conversation on the ML or CC at the very least. Others might want to participate. My personal preference is to NOT receive personal copies. On Tuesday 02 August 2011, 11:20:15 Magnus Wirström wrote: 2011/8/2 Hans-Peter Jansen h...@urpla.net: 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. It prints nothing in the console when i start up... Ah, of course not. 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.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()) This was an attempt to get it to work. I added this and forgot to remove it. What i understand of the tutorial, the bindings to the slots would be done automatic by this line in the script above QtCore.QMetaObject.connectSlotsByName(Dialog). Yes. For that reason, if you try my fixed script, you get the Hello twice, once from the manual connection, and one from the automatic connection. I think my question is why this is not working. Your app is missing a major part: the usual if __name__ is __main__: Check out the ui file. Not only it carries some such, it is also using sane import clauses. self.pushButton.clicked.connect(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? Yes ... it looks much nicer... I tried to replace my line with yours but still no joy... still the same result... nothing happens. if i press the pushbutton a couple of times i get this message in the console: QDialog::exec: Recursive call detected When i start to get it ... it appears on every click. This is confusing. You need to run the testui.py script, not the Ui_testui.py script for this to work. The latter is just the dialog
Re: [PyQt] Trying to learn ...
2011/8/2 Hans-Peter Jansen h...@urpla.net: Magnus, please keep the conversation on the ML or CC at the very least. Others might want to participate. My personal preference is to NOT receive personal copies. Sorry ... first time using mailing list so i just used reply button, my bad. Forgive me On Tuesday 02 August 2011, 11:20:15 Magnus Wirström wrote: 2011/8/2 Hans-Peter Jansen h...@urpla.net: 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. It prints nothing in the console when i start up... Ah, of course not. 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.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()) This was an attempt to get it to work. I added this and forgot to remove it. What i understand of the tutorial, the bindings to the slots would be done automatic by this line in the script above QtCore.QMetaObject.connectSlotsByName(Dialog). Yes. For that reason, if you try my fixed script, you get the Hello twice, once from the manual connection, and one from the automatic connection. I think my question is why this is not working. Your app is missing a major part: the usual if __name__ is __main__: Check out the ui file. Not only it carries some such, it is also using sane import clauses. This seems to do the trick ... i have now an working app that responds to signals Thanks for the help :) I will now try to learn pyqt :) Magnus self.pushButton.clicked.connect(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? Yes ... it looks much nicer... I tried to replace my line with yours but still no joy... still the same result... nothing happens. if i press the pushbutton a couple of times i get this message in the console:
Re: [PyQt] Trying to learn ...
On Tue, 2 Aug 2011 08:38:21 PM Hans-Peter Jansen wrote: Magnus, please keep the conversation on the ML or CC at the very least. Others might want to participate. My personal preference is to NOT receive personal copies. On Tuesday 02 August 2011, 11:20:15 Magnus Wirström wrote: 2011/8/2 Hans-Peter Jansen h...@urpla.net: 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. It prints nothing in the console when i start up... Ah, of course not. 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.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()) This was an attempt to get it to work. I added this and forgot to remove it. What i understand of the tutorial, the bindings to the slots would be done automatic by this line in the script above QtCore.QMetaObject.connectSlotsByName(Dialog). Yes. For that reason, if you try my fixed script, you get the Hello twice, once from the manual connection, and one from the automatic connection. I think my question is why this is not working. Your app is missing a major part: the usual if __name__ is __main__: Check out the ui file. Not only it carries some such, it is also using sane import clauses. self.pushButton.clicked.connect(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? Yes ... it looks much nicer... I tried to replace my line with yours but still no joy... still the same result... nothing happens. if i press the pushbutton a couple of times i get this message in the
[PyQt] Trying to learn ...
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? 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()) @pyqtSlot() def on_pushButton_clicked(self): Slot documentation goes here. print(hello) ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] Trying to learn ...
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 ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
