How to trigger text in a widget using PyQt - pyqt4

Question

This may look like a long question but it is actually really short, I've just decided to copy all the working code here.
I have a main window and a Tip of the Day widget.
I generated both the UI using the PyQt Designer.
I can open the Tip of the Day widget from the main window menu but I'm not able to make the buttons work:
I'd like to replace some text in the Tip of the Day widget when the previous and the next buttons are clicked.
I have the following main window called MainWindow.py:
from PyQt4 import QtCore, QtGui
from MainWindowUi import Ui_MainWindow
from FormUi import Ui_Form
class MainWindow(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
# Main window user interface elements
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
# Main window signal/slot connections
self.setupConnections()
#QtCore.pyqtSlot()
def showTipDialog(self):
'''Trig dialog Tip'''
form = QtGui.QDialog()
form.ui = Ui_Form()
form.ui.setupUi(form)
form.exec_()
def setupConnections(self):
'''Signal and Slot Support'''
self.connect(self.ui.actionTip_of_the_Day, QtCore.SIGNAL('triggered()'), self.showTipDialog)
I have the following main.py:
import sys
from PyQt4 import QtGui
from MainWindow import MainWindow
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
I have the following main window UI called MainWindowUi.py:
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'MainWindow.ui'
#
# Created: Thu May 21 20:26:31 2015
# by: PyQt4 UI code generator 4.11.3
#
# WARNING! All changes made in this file will be lost!
from PyQt4 import QtCore, QtGui
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(800, 600)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtGui.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
self.menubar.setObjectName(_fromUtf8("menubar"))
self.menuHelp = QtGui.QMenu(self.menubar)
self.menuHelp.setObjectName(_fromUtf8("menuHelp"))
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtGui.QStatusBar(MainWindow)
self.statusbar.setObjectName(_fromUtf8("statusbar"))
MainWindow.setStatusBar(self.statusbar)
self.actionTip_of_the_Day = QtGui.QAction(MainWindow)
self.actionTip_of_the_Day.setObjectName(_fromUtf8("actionTip_of_the_Day"))
self.menuHelp.addAction(self.actionTip_of_the_Day)
self.menubar.addAction(self.menuHelp.menuAction())
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
self.menuHelp.setTitle(_translate("MainWindow", "Help", None))
self.actionTip_of_the_Day.setText(_translate("MainWindow", "Tip of the Day", None))
I have the following widget form UI FormUi.py:
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'Form.ui'
#
# Created: Thu May 21 23:57:41 2015
# by: PyQt4 UI code generator 4.11.3
#
# WARNING! All changes made in this file will be lost!
from PyQt4 import QtCore, QtGui
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName(_fromUtf8("Form"))
Form.resize(418, 249)
self.verticalLayout = QtGui.QVBoxLayout(Form)
self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
self.lineEdit = QtGui.QLineEdit(Form)
self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
self.verticalLayout.addWidget(self.lineEdit)
self.horizontalLayout = QtGui.QHBoxLayout()
self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
self.pushButton_previous = QtGui.QPushButton(Form)
self.pushButton_previous.setObjectName(_fromUtf8("pushButton_previous"))
self.horizontalLayout.addWidget(self.pushButton_previous)
self.pushButton_next = QtGui.QPushButton(Form)
self.pushButton_next.setObjectName(_fromUtf8("pushButton_next"))
self.horizontalLayout.addWidget(self.pushButton_next)
self.verticalLayout.addLayout(self.horizontalLayout)
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
Form.setWindowTitle(_translate("Form", "Form", None))
self.lineEdit.setText(_translate("Form", "Here a tip I'd like to replace by pressing the buttons below.", None))
self.pushButton_previous.setText(_translate("Form", "Previous Tip", None))
self.pushButton_next.setText(_translate("Form", "Next Tip", None))
Please run main.py in order to open the main window and click Help > Tip of the Day to open the widget.
Thanks for the attention.

Answer 1

You have a MainWindow class (which you instantiate from the main() function) which you have written to instantiate your Ui_MainWindow class (thus creating the GUI) and link a button to a method which pops up the dialog.
Now just apply the same logic to the dialog. Instead of creating a QDialog() directly in showTipDialog, instead instantiate a subclass QDialog. Write the subclass in a similar way to what you've done for MainWindow. Connect the clicked signals from the prev/next pushbuttons to appropriate methods (which you write) that change the contents of the QLineEdit.