Pyqt5 inheritance - python-3.x

Question

full code: link to file
I'm trying to build a GUI using PyQT5, and I have two classes:
In the main class "Window", I have a method to close/exit the GUI, and when I use the method within the class, everything is working
class Window(QMainWindow):
choice = QMessageBox.question(self, ' WARNING!!!!', 'Are you sure to {}'.format(message),
QMessageBox.Yes | QMessageBox.No,
QMessageBox.No)
if choice == QMessageBox.Yes:
print('Quiting Application')
return sys.exit()
else:
pass
But the problem starts here, with the second class, when I try to quit using other class : Q_button.clicked.connect(Window.close_app)
class NewGrid(QWidget):
def __init__(self, parent=None):
super(NewGrid, self).__init__(parent)
grid = QGridLayout()
grid.addWidget(self.createExampleGroup(), 0, 0)
grid.addWidget(self.check_box_vBBU(), 21, 21)
grid.addWidget(self.button_test(), 0, 1)
grid.addWidget(self.quit_button(), 2, 2)
self.setLayout(grid)
def quit_button(self):
groupBox = QGroupBox("Quit_placeholder")
Q_button = QPushButton('Quit', self)
box = QHBoxLayout()
box.addWidget(Q_button)
super()
**Q_button.clicked.connect(Window.close_app)**
groupBox.setLayout(box)
return groupBox
any solution?
edit:
Here is the full code
import sys
from ctypes import windll
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
SCREEN_WIDTH = windll.user32.GetSystemMetrics(0) # 1920
SCREEN_HEIGHT = windll.user32.GetSystemMetrics(1) # 1080
class CustomDialog(QDialog):
def __init__(self, *args, **kwargs):
super(CustomDialog, self).__init__(parent=None)
Qbtn = QDialogButtonBox.Ok | QDialogButtonBox.Cancel
self.buttonBox.accepted(self.accept)
self.buttonBox.rejected(self.reject)
self.layout = QVBoxLayout()
self.layout.addWidget(self.buttonBox)
self.setLayout(self.layout)
class Window(QMainWindow):
def __init__(self):
super(Window, self).__init__()
self.setGeometry(SCREEN_WIDTH / 3, SCREEN_HEIGHT / 3, SCREEN_WIDTH / 3,
SCREEN_HEIGHT / 2) # (start_point_X,start_point_Y,DIMensionX,DimensionY)
self.setWindowIcon(QIcon('dru_icon.png'))
self.setWindowTitle('----------------------DRU GUI-----------------')
self.statusBar()
self.file_menu()
self.view_menu()
self.toolbar_menu()
self.home()
def home(self):
# btn = QPushButton('quit', self)
# btn.clicked.connect(self.close_app)
# make the buttons near the bottom right: 1920-50=450, 1080-50=250
# btn.move(450, 250)
# btn.resize(50, 50)
# btn.move(SCREEN_WIDTH / 3 - 50, SCREEN_HEIGHT / 2 - 50)
label = QLabel("Holla")
label.setAlignment(Qt.AlignBottom)
self.setCentralWidget(label)
widget = NewGrid()
self.setCentralWidget(widget)
self.show()
def toolbar_menu(self):
toolbar = QToolBar("My Main Toolbar")
toolbar.setIconSize(QSize(32, 32)) # manual size
self.addToolBar(toolbar) # showing toolbar
icon1 = self.set_toolbar_icon('new_icon', icon_image='truck--plus')
icon1.triggered.connect(self.close_app)
icon2 = self.set_toolbar_icon('iconNum2')
# icon2.triggered.connect(self.notification_button)
icon3 = self.set_toolbar_icon('iconNum3', icon_image='application-monitor')
def set_toolbar_icon(self, icon_name="NONE", icon_image='animal-monkey.png', Width=32, Length=32):
toolbar = QToolBar("My Main Toolbar")
toolbar.setIconSize(QSize(Width, Length)) # manual size
self.addToolBar(toolbar) # showing toolbar
icon_name = QAction(QIcon(icon_image), icon_name, self)
# icon_name.triggered.connect(
# self.notification_button) # add different command later, for now its quitting,
self.toolBar = self.addToolBar('RUN IT')
# self.toolBar.addAction(icon1) #will be the default icon size from windows
toolbar.addAction(icon_name)
return icon_name
# ------main menu dialog --------
def file_menu(self):
# creating a toolbar with menu
mainMenu = self.menuBar()
fileMenu = mainMenu.addMenu('File')
quit_tooltip = QAction('&Quit', self)
quit_tooltip.setShortcut('Ctrl+Q')
quit_tooltip.setToolTip('close the app')
# quit_tooltip.triggered.connect(self.close_app)
quit_tooltip.triggered.connect(self.close_app)
fileMenu.addAction(quit_tooltip)
def view_menu(self):
mainMenu = self.menuBar()
viewMenu = mainMenu.addMenu('View')
# ------main menu dialog --------
def notification_button(self):
return self.areYouSure_toolbar(message='NO ACTION DEFINED')
def close_app(self): # defined our own method of closing
# choice = QMessageBox.question(self, ' WARNING!!!!', 'Are you sure to quit?',
# QMessageBox.Yes | QMessageBox.No,
# QMessageBox.No) # the last QMessageBox.No is to highliht the option implicitly
choice = self.areYouSure_toolbar(message='Quit')
if choice == QMessageBox.Yes:
print('Quiting Application')
return sys.exit()
else:
pass
def areYouSure_toolbar(self, message='____'):
choice = QMessageBox.question(self, ' WARNING!!!!', 'Are you sure to {}'.format(message),
QMessageBox.Yes | QMessageBox.No,
QMessageBox.No) # the last QMessageBox.No is to highliht the option implicitly
return choice
class NewGrid(QWidget):
def __init__(self, parent=None):
super(NewGrid, self).__init__(parent)
grid = QGridLayout()
grid.addWidget(self.createExampleGroup(), 0, 0)
grid.addWidget(self.check_box_vBBU(), 0, 1)
grid.addWidget(self.button_test(), 1, 0)
grid.addWidget(self.check_box_LPR(), 1, 1)
grid.addWidget(self.quit_button(), 3, 3)
# grid.addWidget(self.createExampleGroup(), 1, 2)
self.setLayout(grid)
# temp = Window()
# self.setWindowTitle("PyQt5 Group Box")
# self.resize(400, 300)
def check_box_vBBU(self):
groupBox = QGroupBox("Input (From vBBU) ")
checkbox1 = QCheckBox('Port {}'.format(1), self)
checkbox2 = QCheckBox('Port {}'.format(2), self)
check_box = QHBoxLayout()
check_box.addWidget(checkbox1)
check_box.addWidget(checkbox2)
check_box.addStretch(1)
groupBox.setLayout(check_box)
return groupBox
def check_box_LPR(self):
groupBox = QGroupBox("Output (from LPR) ")
layout = QHBoxLayout()
for n in range(20):
btn = QCheckBox('LPR' + str(n))
# btn.pressed.connect(self.close_app_Newgrid) #where to connect
layout.addWidget(btn)
# btn.setChecked(True)
num_of_buttons = n
# widget = QWidget()
selectRandom_btn = QPushButton('Random ports')
layout.addWidget(selectRandom_btn)
selectAll_btn = QPushButton('All')
selectAll_btn.pressed.connect(lambda : self.select_buttons(num_of_buttons, btn))
layout.addWidget(selectAll_btn)
groupBox.setLayout(layout)
return groupBox
def select_buttons(self, num_of_buttons,btn):
for x in range(1,num_of_buttons-1):
btn.setC
# btn[1].setChecked(True)
def quit_button(self):
groupBox = QGroupBox("Quit_placeholder")
Q_button = QPushButton('Quit', self)
box = QHBoxLayout()
box.addWidget(Q_button)
super()
# Q_button.clicked.connect(self.close_app_Newgrid)
# Q_button.clicked.connect(Window.close_app)
groupBox.setLayout(box)
return groupBox
def button_test(self):
groupBox = QGroupBox("test buttons")
btn1 = QPushButton("Push me", self)
# btn1.clicked.connect(self.close_app)# need to connect the button somewhere..
vbox = QHBoxLayout()
vbox.addWidget(btn1)
# vbox.addStretch(1)
groupBox.setLayout(vbox)
return groupBox
def createExampleGroup(self):
groupBox = QGroupBox("Data type")
radio1 = QRadioButton("Binary")
radio2 = QRadioButton("Decimal")
radio1.setChecked(True)
vbox = QVBoxLayout()
vbox.addWidget(radio1)
vbox.addWidget(radio2)
vbox.addStretch(1)
groupBox.setLayout(vbox)
return groupBox
def close_app_Newgrid(self): # defined our own method of closing
choice = QMessageBox.question(self, ' WARNING!!!!', 'Are you sure to quit?',
QMessageBox.Yes | QMessageBox.No,
QMessageBox.No) # the last QMessageBox.No is to highliht the option implicitly
if choice == QMessageBox.Yes:
# print('Quiting Application')
return sys.exit()
else:
return
def run():
app = QApplication(sys.argv)
Gui = Window()
sys.exit(app.exec_())
run()
update :
I tried to simplify the solution below:
for w in QApplication.topLevelWidgets():
if isinstance(w,Window):
w = True
windows = w

Answer 1

The connection is between the signal of one object and the slot of another, not between classes, so the instruction is incorrect.
So in order to perform this task we must get some way to the Window object, a possible solution is to take advantage of Window is the window, so it is a top-Level for it we use the topLevelWidgets() method and we filter through isinstance():
def quit_button(self):
groupBox = QGroupBox("Quit_placeholder")
Q_button = QPushButton('Quit', self)
box = QHBoxLayout()
box.addWidget(Q_button)
#Q_button.clicked.connect(self.close_app_Newgrid)
windows = [w for w in QApplication.topLevelWidgets() if isinstance(w, Window)]
if windows:
Q_button.clicked.connect(windows[0].close_app)
groupBox.setLayout(box)
return groupBox
Note: the problem is not due to inheritance.