PyQt5 Designer. Getting a button event to function

Question

I am trying to get a button event handler working using Qt Designer.

I am using Anaconda-Spyder with Python 3.6

The form appears but the button btn_browse does not function. The line edit box has a cursor in it and you can type into it.

The Python file generated automatically from the ui is below. It is called file_reader.py

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(640, 320)
        self.btn_browse = QtWidgets.QPushButton(Dialog)
        self.btn_browse.setGeometry(QtCore.QRect(220, 50, 113, 32))
        self.btn_browse.setObjectName("btn_browse")
        self.lineEdit = QtWidgets.QLineEdit(Dialog)
        self.lineEdit.setGeometry(QtCore.QRect(170, 120, 241, 131))
        self.lineEdit.setObjectName("lineEdit")
        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
        self.btn_browse.setText(_translate("Dialog", "MyButton"))

The code I have used (pretty much from the QtDesigner Docs site) is

from PyQt5 import QtGui
from PyQt5.QtWidgets import QDialog, QApplication
from file_reader import Ui_Dialog
class Dialog(QDialog):
    def __init__(self):
        super(Dialog, self).__init__()

        # Set up the user interface from Designer.
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)

        # Make some local modifications.
        self.ui.colorDepthCombo.addItem("2 colors (1 bit per pixel)")

        # Connect up the buttons.
        self.ui.btn_browse.clicked.connect(self.browse_folder)


    def browse_folder(self):
        #exit
        print("Hello")
        #self.textBrowser.clear() # In case there are any existing elements in the list
        directory = QtGui.QFileDialog.getExistingDirectory(self,"Pick a folder")
        # execute getExistingDirectory dialog and set the directory variable to be equal
        # to the user selected directory

        if directory: # if user didn't pick a directory don't continue
            for file_name in os.listdir(directory): # for all files, if any, in the directory
                self.listWidget.addItem(file_name)  # add file to the listWidget




import sys        
app = QApplication(sys.argv)
window = Dialog() #Also tried QDialog() here
ui = Ui_Dialog()
ui.setupUi(window)

window.show()
sys.exit(app.exec_())

I don't think the function browse_folder is being called. I think the issue might be the QDialog class being used rather than QMainForm. I

I am working on that. Also, I am unsure what the x switch in the ui convertor does.

I have looked at several answers here and can't see what I am doing wrong.

Answer 1

Your code has the following problems:

• You are not creating a Dialog object, but a QDialog filled with Ui_Dialog that does not have the browse_folder method or the connection.

• QFileDialog is part of QtWidgets , it is not part of QtGui , you are probably using an example of PyQt4 .

• I'm assuming that listWidget is from Ui_Dialog so you must sign in through ui .

---

from PyQt5.QtWidgets import QDialog, QApplication, QFileDialog
from file_reader import Ui_Dialog
import os

class Dialog(QDialog):
    def __init__(self):
        super(Dialog, self).__init__()

        # Set up the user interface from Designer.
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)

        # Make some local modifications.
        self.ui.colorDepthCombo.addItem("2 colors (1 bit per pixel)")

        # Connect up the buttons.
        self.ui.btn_browse.clicked.connect(self.browse_folder)


    def browse_folder(self):
        #exit
        print("Hello")
        #self.textBrowser.clear() # In case there are any existing elements in the list
        directory = QFileDialog.getExistingDirectory(self,"Pick a folder")
        # execute getExistingDirectory dialog and set the directory variable to be equal
        # to the user selected directory

        if directory: # if user didn't pick a directory don't continue
            for file_name in os.listdir(directory): # for all files, if any, in the directory
                self.ui.listWidget.addItem(file_name)  # add file to the listWidget


import sys        
app = QApplication(sys.argv)
window = Dialog()
window.show()
sys.exit(app.exec_())