Redraw main window in pyQT5 on update - python-3.x

Question

I am trying to redraw my screen after an action.
Basically I am showing a list of labels to print, when a label is printed, or the refresh button is clicked, all child widgets should be removed and the database query will pull in the new ones.
here is my code, I am struggling with the function def refresh, I am new to qt and using python3
from functools import partial
import cups
from PyQt5 import QtCore, QtWidgets
import barcode
from barcode.writer import ImageWriter
import sql
class Ui_MainWindow(object):
def __init__(self):
self.centralwidget = QtWidgets.QWidget(MainWindow)
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(1024, 600)
self.centralwidget.setObjectName("centralwidget")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(910, 10, 90, 28))
self.pushButton.setObjectName("pushButton")
self.scrollArea = QtWidgets.QScrollArea(self.centralwidget)
self.scrollArea.setGeometry(QtCore.QRect(0, 50, 1027, 541))
self.scrollArea.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
self.scrollArea.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.scrollArea.setWidgetResizable(False)
self.scrollArea.setObjectName("scrollArea")
self.scrollAreaWidgetContents = QtWidgets.QWidget()
rows = len(sql.get_prepacks()) / 5
self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 1027, rows * 280))
self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents")
self.scrollArea.setWidget(self.scrollAreaWidgetContents)
MainWindow.setCentralWidget(self.centralwidget)
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "Prepack Print Station"))
self.pushButton.setText(_translate("MainWindow", "Reload"))
self.pushButton.clicked.connect(self.on_click)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
self.show_cartons()
def on_click(self):
self.refresh()
def show_cartons(self):
i = 0
z = 20
y = 20
pre_packs = sql.get_prepacks()
for p in pre_packs:
pz = 35
py = 30
# Box
self.frame = QtWidgets.QFrame(self.scrollAreaWidgetContents)
self.frame.setGeometry(QtCore.QRect(z, y, 150, 200))
self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
# Prepack ID
self.label = QtWidgets.QLabel(self.frame)
self.label.setGeometry(QtCore.QRect(pz, py, 100, 20))
self.label.setText(str(p[0]))
py = py + 40
# Altcode
self.label_2 = QtWidgets.QLabel(self.frame)
self.label_2.setGeometry(QtCore.QRect(pz, py, 100, 20))
self.label_2.setText(str(p[1]))
py = py + 40
# Colour
self.label_3 = QtWidgets.QLabel(self.frame)
self.label_3.setGeometry(QtCore.QRect(pz, py, 100, 20))
self.label_3.setText(str(p[2]))
py = py + 40
# Button
self.p_button = QtWidgets.QPushButton(self.frame)
self.p_button.setGeometry(QtCore.QRect(10, py, 130, 40))
self.p_button.setText("Print " + str(p[3]) + " Labels")
self.p_button.clicked.connect(partial(self.print_clicked, str(p[0])))
z = z + 180
i = i + 1
if i == 5:
z = 20
i = 0
y = y + 230
def print_clicked(self, pp):
labels = sql.get_labelsforprepack(pp)
conn = cups.Connection()
totallabels = len(labels)
alloccode = labels[0][1]
bcode = barcode.get('code39', str(alloccode), writer=ImageWriter())
filename = bcode.save('bcode')
conn.printFile("USB", filename, "Test", {"copies": str(totallabels)})
sql.insert_print_record(alloccode)
for l in labels:
sql.insert_carton(str(l[0]), str(l[1]))
self.refresh()
def refresh(self):
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.repaint()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
UPDATE -> I am a little closer using this:
def refresh(self):
for i in self.scrollAreaWidgetContents.children():
sip.delete(i)
self.show_cartons()
self.scrollAreaWidgetContents.repaint()
The frames are now deleted, but calling show_cartons() doesn't readd them, add .repaint is not working either

Answer 1

And this is how I did it in the end
import os
from functools import partial
import cups
import sip
import time
from PyQt5 import QtCore, QtWidgets
import barcode
from barcode.writer import ImageWriter
import sql
class Ui_MainWindow(object):
def setupBasics(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(1024, 600)
MainWindow.setWindowTitle("Prepack Print Station")
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(910, 10, 90, 28))
self.pushButton.setObjectName("pushButton")
self.pushButton.setText("Reload")
self.pushButton.clicked.connect(self.on_click)
self.scrollArea = QtWidgets.QScrollArea(self.centralwidget)
self.scrollArea.setGeometry(QtCore.QRect(0, 50, 1027, 541))
self.scrollArea.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
self.scrollArea.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.scrollArea.setWidgetResizable(False)
self.scrollArea.setObjectName("scrollArea")
MainWindow.setCentralWidget(self.centralwidget)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
self.setupDynamics()
def setupDynamics(self):
self.scrollAreaWidgetContents = QtWidgets.QWidget()
rows = len(sql.get_prepacks()) / 5
self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 1027, rows * 280))
self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents")
self.show_cartons()
def on_click(self):
self.refresh()
def show_cartons(self):
i = 0
z = 20
y = 20
pre_packs = sql.get_prepacks()
for p in pre_packs:
pz = 35
py = 30
# Box
self.frame = QtWidgets.QFrame(self.scrollAreaWidgetContents)
self.frame.setGeometry(QtCore.QRect(z, y, 150, 200))
self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
# Prepack ID
self.label = QtWidgets.QLabel(self.frame)
self.label.setGeometry(QtCore.QRect(pz, py, 100, 20))
self.label.setText(str(p[0]))
py = py + 40
# Altcode
self.label_2 = QtWidgets.QLabel(self.frame)
self.label_2.setGeometry(QtCore.QRect(pz, py, 100, 20))
self.label_2.setText(str(p[1]))
py = py + 40
# Colour
self.label_3 = QtWidgets.QLabel(self.frame)
self.label_3.setGeometry(QtCore.QRect(pz, py, 100, 20))
self.label_3.setText(str(p[2]))
py = py + 40
# Button
self.p_button = QtWidgets.QPushButton(self.frame)
self.p_button.setGeometry(QtCore.QRect(10, py, 130, 40))
self.p_button.setText("Print " + str(p[3]) + " Labels")
self.p_button.clicked.connect(partial(self.print_clicked, str(p[0])))
z = z + 180
i = i + 1
if i == 5:
z = 20
i = 0
y = y + 230
self.scrollArea.setWidget(self.scrollAreaWidgetContents)
self.scrollArea.repaint()
def print_clicked(self, pp):
labels = sql.get_labelsforprepack(pp)
conn = cups.Connection()
totallabels = len(labels)
alloccode = labels[0][1]
bcode = barcode.get('code39', str(alloccode), writer=ImageWriter())
filename = bcode.save('bcode')
conn.printFile("USB", filename, "Test", {"copies": str(totallabels)})
sql.insert_print_record(alloccode)
for l in labels:
sql.insert_carton(str(l[0]), str(l[1]))
self.refresh()
def refresh(self):
d = self.scrollAreaWidgetContents.children()
e = reversed(d)
for g in e:
g.deleteLater()
self.scrollAreaWidgetContents.deleteLater()
self.setupDynamics()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupBasics(MainWindow)
MainWindow.show()
sys.exit(app.exec_())