Hello everyone,
I am attaching 2 sample codes - one that doesn't work and another that
does. There is no apparent reason for the earlier not to work. [The
third script main.py just defines the interface and is imported in both
cases.]
core_notworking.py
To illustrate my problem, I have a line-edit (Edt1, has the text
"Choose") and a pushbutton (Btn1, labelled "Choose"), both of which are
trying to open a file dialog box. [The other pushbutton is merely to
quit the application.] In the first case, pressing the return key from
the line edit does open a file dialog box. The user can then choose the
file, the name is displayed correctly in the line-edit and the file
dialog box closes. In the second case, the file dialog box opens and the
name of the file the user chooses is correctly printed on the
command-line. However, the file dialog box doesn't close and we seem to
hit an infinite loop. If we forcibly close the application, the file
name is lost.
core_working.py
I replicate the situation described above and add @pyqtSlot descriptors
as described at
http://www.riverbankcomputing.com/static/Docs/PyQt4/html/new_style_signals_slots.html
I am not sure why omitting the descriptor completely alters the expected
behavior. It would be great if someone could please help me with this.
Thanks in advance,
Jishnu
#!/usr/bin/env python
from PyQt4 import QtGui
import re
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import main
import sys
import os
class MainWindow(QMainWindow, main.Ui_MainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
self.setupUi(self)
@pyqtSlot()
def on_Edt1_returnPressed(self):
fname1 = QtGui.QFileDialog.getOpenFileName(self, 'Open file',
'/home')
self.Edt1.clear()
self.Edt1.setText(fname1)
@pyqtSlot()
def on_Btn1_clicked(self):
fname2 = QtGui.QFileDialog.getOpenFileName(self, 'Open file',
'/home')
print fname2
@pyqtSlot()
def on_Quit_clicked(self):
sys.exit()
if __name__ == "__main__":
app = QApplication(sys.argv)
ex = MainWindow()
ex.show()
app.exec_()
#!/usr/bin/env python
from PyQt4 import QtGui
import re
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import main
import sys
import os
class MainWindow(QMainWindow, main.Ui_MainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
self.setupUi(self)
def on_Edt1_returnPressed(self):
fname1 = QtGui.QFileDialog.getOpenFileName(self, 'Open file',
'/home')
self.Edt1.clear()
self.Edt1.setText(fname1)
def on_Btn1_clicked(self):
fname2 = QtGui.QFileDialog.getOpenFileName(self, 'Open file',
'/home')
print fname2
def on_Quit_clicked(self):
sys.exit()
if __name__ == "__main__":
app = QApplication(sys.argv)
ex = MainWindow()
ex.show()
app.exec_()
from PyQt4 import QtCore, QtGui
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(835, 644)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setEnabled(True)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.Quit = QtGui.QPushButton(self.centralwidget)
self.Quit.setGeometry(QtCore.QRect(170, 380, 75, 25))
self.Quit.setObjectName(_fromUtf8("Quit"))
self.Btn1 = QtGui.QPushButton(self.centralwidget)
self.Btn1.setGeometry(QtCore.QRect(130, 310, 156, 25))
self.Btn1.setObjectName(_fromUtf8("Btn1"))
self.Edt1 = QtGui.QLineEdit(self.centralwidget)
self.Edt1.setGeometry(QtCore.QRect(110, 200, 205, 21))
self.Edt1.setObjectName(_fromUtf8("Edt1"))
MainWindow.setCentralWidget(self.centralwidget)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(QtGui.QApplication.translate("MainWindow", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
self.Quit.setText(QtGui.QApplication.translate("MainWindow", "Quit", None, QtGui.QApplication.UnicodeUTF8))
self.Btn1.setText(QtGui.QApplication.translate("MainWindow", "Choose", None, QtGui.QApplication.UnicodeUTF8))
self.Edt1.setText(QtGui.QApplication.translate("MainWindow", "Choose", None, QtGui.QApplication.UnicodeUTF8))
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