I am struggling to retrieve results from a QDialog window and pass them back to the previous window. I want the user to be able to select a value/values, and then once they click okay in the dialog window, it should return them back to the previous window, and pass the text into the byVariables Textbox. The error returns on the line self.procUnivariate.byVariables.setText(item.text()). The error states:
AttributeError: 'ProcUnivariateVariables' object has no attribute 'procUnivariate'
I also tried using a return statement as you can see that is commented out. Unfortunately it seemed like the code got stuck and wasn't moving to the next line as I threw a print statement after and it never printed that line. I need help figuring out how to pass it back to the ProcUnivariate class once the okay button is clicked. Also, if I can figure this out, I'll likely turn the ProcUnivariate Class into a dialog window as well because it should take away the focus from the main window and shouldn't stay open if the main window is closed.
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QPushButton, QListWidget, QLineEdit, QTextEdit, QGridLayout, QHBoxLayout, QVBoxLayout, QDialog, QSizePolicy, QFileDialog, QTabWidget, QCheckBox
import PyQt5.QtGui as qtg
import glob
import os
from PyQt5.QtCore import Qt, QSettings
import inspect
from PyQt5 import QtCore
import pandas as pd
import pathlib
import pyreadstat
import json
class ProcUnivariateVariables(QDialog):
def __init__(self):
super().__init__()
self.procUnivariateByVariables = []
self.layout = QGridLayout()
self.setLayout(self.layout)
self.allVariables = QListWidget()
self.allVariables.setSelectionMode(3)
self.variablesSelected = QListWidget()
self.variablesSelected.setSelectionMode(3)
self.layout.addWidget(self.allVariables, 1,0, 4, 1)
self.layout.addWidget(self.variablesSelected, 1, 1, 4, 1)
self.okButton = QPushButton("Ok")
self.resetButton = QPushButton("Reset")
self.cancelButton = QPushButton("Cancel")
self.layout.addWidget(self.okButton, 1, 2)
self.layout.addWidget(self.resetButton, 2, 2)
self.layout.addWidget(self.cancelButton, 3, 2)
self.addByVariable = QPushButton(">")
self.removeVariable = QPushButton("<")
self.layout.addWidget(self.addByVariable, 5, 0)
self.layout.addWidget(self.removeVariable, 5, 1)
self.button_Connections()
def setItems(self, items):
self.allVariables.clear()
for item in items:
self.allVariables.addItem(item)
def add_by_variable(self):
selected_elements=[item.text() for item in self.allVariables.selectedItems()]
variableItem = self.variablesSelected.insertItems(self.variablesSelected.count(),selected_elements)
def button_Connections(self):
self.addByVariable.clicked.connect(self.add_by_variable)
self.removeVariable.clicked.connect(self.remove_variable)
self.okButton.clicked.connect(self.okay_clicked)
def remove_variable(self):
removeVariables = [item.text() for item in self.variablesSelected.selectedItems()]
self.selectedVariables.takeItems(removeVariables)
#sourceItem = self.currentSource.takeItem(oldSource)
def okay_clicked(self):
self.byVariablesSelected = [item.text() for item in self.variablesSelected.selectedItems()]
#self.procUnivariateByVariables = byVariablesSelected
print(self.byVariablesSelected)
self.accept()
#return self.byVariablesSelected
for item in self.byVariablesSelected:
print(item)
self.procUnivariate.byVariables.setText(item.text())
class ProcUnivariate(QWidget):
def __init__(self):
super().__init__()
self.procUnivariateVariables = None
layout = QGridLayout(self)
##Proc Univariate window Widgets
self.by = QLabel("By")
self.byVariables = QLineEdit()
self.byVariableList = QListWidget()
self.byButton = QPushButton("...")
self.varLabel = QLabel("Var")
self.classLabel = QLabel("Class")
self.freqLabel = QLabel("Freq")
self.histogramLabel = QLabel("Histogram")
self.freqBox = QLineEdit()
self.histBox = QLineEdit()
self.varBox = QLineEdit()
self.varButton = QPushButton("...")
self.sourceLabel = QLabel("Name")
self.sourceText = QLineEdit()
self.sourceButton = QPushButton("...")
self.selectionLabel = QLabel("Selection criteria")
self.selectionCriteria = QTextEdit()
self.statisticLabel = QLabel("Output")
self.statisticSearch = QLineEdit()
self.statisticList = QListWidget()
self.statisticList.setSortingEnabled(True)
self.outputLabel = QLabel("Output Statement")
self.outputText = QTextEdit()
self.fileOutputPath = QLineEdit("Output File Path")
self.runButton = QPushButton("Run")
self.previewButton = QPushButton("Preview")
self.okButton = QPushButton("Ok")
self.resetButton = QPushButton("Reset")
self.cancelButton = QPushButton("Cancel")
self.secondWindowConnections()
layout.addWidget(self.by, 1,0,1,1)
layout.addWidget(self.byVariables, 2, 0, 1, 4)
layout.addWidget(self.byButton, 2, 5, 1, 1)
#layout.addWidget(self.byVariableList, 3, 0, 1, 1)
layout.addWidget(self.freqLabel, 3, 0)
layout.addWidget(self.freqBox, 4, 0, 1, 4)
layout.addWidget(self.histogramLabel, 5, 0)
layout.addWidget(self.histBox, 6, 0, 1, 4)
layout.addWidget(self.varLabel, 7, 0, 1, 4)
layout.addWidget(self.varBox, 8, 0)
layout.addWidget(self.varButton, 8,5)
layout.addWidget(self.sourceLabel, 1, 6)
layout.addWidget(self.sourceText, 2, 6, 1, 4)
layout.addWidget(self.sourceButton, 2, 10)
layout.addWidget(self.selectionLabel, 3, 6)
layout.addWidget(self.selectionCriteria, 4, 6, 1, 4)
layout.addWidget(self.statisticLabel, 5, 6)
layout.addWidget(self.statisticSearch, 6, 6, 1, 4)
layout.addWidget(self.statisticList, 7, 6, 3, 4)
layout.addWidget(self.outputLabel, 10, 6)
layout.addWidget(self.outputText, 11, 6, 1, 4)
layout.addWidget(self.runButton, 12, 6)
layout.addWidget(self.previewButton, 12, 7)
layout.addWidget(self.okButton, 12, 8)
layout.addWidget(self.resetButton, 12, 9)
layout.addWidget(self.cancelButton, 12, 10)
self.setLayout(layout)
def secondWindowConnections(self): # this had a typo
self.byButton.clicked.connect(self.show_third_window)
def show_third_window(self):
if self.procUnivariateVariables is None: # if window has been created yet
self.procUnivariateVariables = ProcUnivariateVariables() # create window
if not self.procUnivariateVariables.isVisible(): # if window is showing
self.procUnivariateVariables.show() # show window
self.procUnivariateVariables.setItems(self.procUnivariateVariablesItems) # send items to window
def send_items(self, items): # this is to collect the variable that
self.procUnivariateVariablesItems = items # move to the third window
class MainWindow(QWidget):
def __init__(self):
super().__init__()
# Add a title
self.setWindowTitle("GUI Querying Program")
self.layout = QHBoxLayout()
self.setLayout(self.layout)
self.initUI()
self.setButtonConnections()
self.sw = None # dont initialize until neccessary.
def initUI(self):
subLayouts = {}
subLayouts['LeftColumn'] = QGridLayout()
self.layout.addLayout(subLayouts['LeftColumn'],1)
self.buttons = {}
self.buttons['addVariable'] = QPushButton('>')
self.buttons['removeVariable'] = QPushButton('<')
self.buttons['Toolkit'] = QPushButton('Toolkit')
self.variables = QListWidget()
self.selectedVariables = QListWidget()
subLayouts['LeftColumn'].addWidget(self.variables, 7,0,4,1)
subLayouts['LeftColumn'].addWidget(self.selectedVariables, 7,1,4,1)
subLayouts['LeftColumn'].addWidget(self.buttons['addVariable'], 10,0,1,1)
subLayouts['LeftColumn'].addWidget(self.buttons['removeVariable'], 10,1,1,1)
subLayouts['LeftColumn'].addWidget(self.buttons['Toolkit'], 11,1,1,1)
names = ['apple', 'banana', 'Cherry']
self.variables.insertItems(0, names)
def setButtonConnections(self):
self.buttons['addVariable'].clicked.connect(self.add_variable)
self.buttons['Toolkit'].clicked.connect(self.show_new_window)
# self.buttons['Toolkit'].clicked.connect(self.add_selected_variables)
# only use one connnect slot
def add_variable(self):
for item in self.variables.selectedItems():
self.selectedVariables.addItem(item.clone())
def show_new_window(self):
if self.sw is None: # check if window has been constructed
self.sw = ProcUnivariate() # construct window
if not self.sw.isVisible(): # If winow is not showing
self.sw.show() # show window
self.sw.send_items(self.add_selected_variables()) # send selected
# variables to second window
def add_selected_variables(self):
items = []
for i in range(self.selectedVariables.count()):
items.append(self.selectedVariables.item(i).clone())
# self.tw.setItems(items) ... self.tw doesnt exist so return them
return items
if __name__ == "__main__":
import sys
app = QApplication([])
mw = MainWindow()
mw.show()
app.exec()
What you need to do is connect a slot to the accepted signal of the dialog, and then retrieve the variables via a dedicated method of the dialog when that signal is emitted.
Here are all the relevant changes (fully tested as working):
class ProcUnivariateVariables(QDialog):
...
def button_Connections(self):
...
# connect to the dialog's built-in accept slot
self.okButton.clicked.connect(self.accept)
# add a method for retrieving the variables
def byVariablesSelected(self):
return [item.text() for item in self.variablesSelected.selectedItems()]
class ProcUnivariate(QWidget):
...
def secondWindowConnections(self): # this had a typo
self.byButton.clicked.connect(self.show_third_window)
self.varButton.clicked.connect(self.show_third_window)
def show_third_window(self):
if self.procUnivariateVariables is None: # if window has been created yet
self.procUnivariateVariables = ProcUnivariateVariables() # create window
# connect the new slot to the dialog's built-in accepted signal
self.procUnivariateVariables.accepted.connect(self.receive_selected_variables)
if not self.procUnivariateVariables.isVisible(): # if window is showing
self.procUnivariateVariables.show() # show window
self.procUnivariateVariables.setItems(self.procUnivariateVariablesItems) # send items to window
# set an identifier from the source button
self.procUnivariateVariables.sourceName = self.sender().text()
# add a slot for handling the dialog's accepted signal
def receive_selected_variables(self):
variables = self.procUnivariateVariables.byVariablesSelected()
text = ', '.join(variables)
if self.procUnivariateVariables.sourceName == 'byButton':
self.byVariables.setText(text)
else:
self.varBox.setText(text)
(Note that the above changes make the okay_clicked method of ProcUnivariateVariables redundant, so it should be removed).