I've been trying to call a new window from an existing one using python3 and Qt4.
I've created two windows using Qt Designer (the main application and another one), and I've converted the .ui files generated by Qt Designer into .py scripts - but I can't seem to create new windows from the main application.
I tried doing this:
############### MAIN APPLICATION SCRIPT ################
from PyQt4 import QtCore, QtGui
import v2
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName(_fromUtf8("Form"))
Form.resize(194, 101)
self.button1 = QtGui.QPushButton(Form)
self.button1.setGeometry(QtCore.QRect(50, 30, 99, 23))
self.button1.setObjectName(_fromUtf8("button1"))
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
Form.setWindowTitle(QtGui.QApplication.translate("Form", "Form", None, QtGui.QApplication.UnicodeUTF8))
self.button1.setText(QtGui.QApplication.translate("Form", "Ventana", None, QtGui.QApplication.UnicodeUTF8))
self.button1.connect(self.button1, QtCore.SIGNAL(_fromUtf8("clicked()")), self.mbutton1)
def mbutton1(self):
v2.main()
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
Form = QtGui.QWidget()
ui = Ui_Form()
ui.setupUi(Form)
Form.show()
sys.exit(app.exec_())
################## SECOND WINDOW #######################
from PyQt4 import QtCore, QtGui
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName(_fromUtf8("Form"))
Form.resize(400, 300)
self.label = QtGui.QLabel(Form)
self.label.setGeometry(QtCore.QRect(160, 40, 57, 14))
self.label.setObjectName(_fromUtf8("label"))
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
Form.setWindowTitle(QtGui.QApplication.translate("Form", "Form", None, QtGui.QApplication.UnicodeUTF8))
self.label.setText(QtGui.QApplication.translate("Form", "LABEL 2", None, QtGui.QApplication.UnicodeUTF8))
def main():
import sys
app = QtGui.QApplication(sys.argv)
Form = QtGui.QWidget()
ui = Ui_Form()
ui.setupUi(Form)
Form.show()
sys.exit(app.exec_())
But I get this Error message:
QCoreApplication::exec: The event loop is already running
QPixmap: Must construct a QApplication before a QPaintDevice
Although pyuic
can create executable scripts with the -x, --execute
option, it is mainly intended for testing.
The main purpose of pyuic
is to create static python modules from Qt Desgner ui
files that allow you to import the contained GUI classes into your application.
Let's say you've created two ui
files using Qt Designer and named them v1.ui
and v2.ui
.
You would then create the two python modules like this:
pyuic4 -o v1.py v1.ui
pyuic4 -o v2.py v2.ui
Next, you would write a separate main.py
script that imports the GUI classes from the modules, and creates instances of them as needed.
So your main.py
could look something like this:
from PyQt4 import QtGui
from v1 import Ui_Form1
from v2 import Ui_Form2
class Form1(QtGui.QWidget, Ui_Form1):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.setupUi(self)
self.button1.clicked.connect(self.handleButton)
self.window2 = None
def handleButton(self):
if self.window2 is None:
self.window2 = Form2(self)
self.window2.show()
class Form2(QtGui.QWidget, Ui_Form2):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.setupUi(self)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = Form1()
window.show()
sys.exit(app.exec_())
Note that I have changed the names of your GUI classes slightly to avoid namespace clashes. To give the GUI classes better names, just set the objectName
property of the top-level class in Qt Desgner. And don't forget to re-run pyuic
after you've made your changes!