Pyqt5 - QComboBox上填充内容极其缓慢

Question

我开发一个接口与3 QCombobox在每一行和每一界面将包括多达50,000行。每个QCombobox充满了15'000项的列表。

该填充过程极为缓慢。是否有可能加快这一进程？我当前的代码填充QCombobox只有10行。在10行，这个过程需要时间和50000行，界面不显示。

后端：

import sys
import os
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QApplication, QWidget, 
QMessageBox, QDialog, QFileDialog
from frontend import Ui_MainWindow

class Ui_MainWindow(QMainWindow, Ui_MainWindow):

    def __init__(self, parent=None):
        super(Ui_MainWindow, self).__init__(parent)
        self.setupUi(self)

        myList = ['AAA'] * 15000

        for i in range(1, 10):
            self.cb1 = QtWidgets.QComboBox()
            self.cb2 = QtWidgets.QComboBox()
            self.cb3 = QtWidgets.QComboBox()

            self.cb1.addItems(myList)
            self.cb2.addItems(myList)
            self.cb3.addItems(myList)

            self.gridLayout_2.addWidget(self.cb2,i,0)
            self.gridLayout_2.addWidget(self.cb1,i,1)
            self.gridLayout_2.addWidget(self.cb2,i,2)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    current_path = os.getcwd()
    app.processEvents()
    prog = Ui_MainWindow()
    prog.showMaximized()
    sys.exit(app.exec_())

前端：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(606, 446)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.scrollArea = QtWidgets.QScrollArea(self.centralwidget)
        self.scrollArea.setWidgetResizable(True)
        self.scrollArea.setObjectName("scrollArea")
        self.scrollAreaWidgetContents = QtWidgets.QWidget()
        self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 586,             385))    

    self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents")
        self.gridLayout_3 = 
        QtWidgets.QGridLayout(self.scrollAreaWidgetContents)
        self.gridLayout_3.setObjectName("gridLayout_3")
        self.gridLayout_2 = QtWidgets.QGridLayout()
        self.gridLayout_2.setObjectName("gridLayout_2")
        self.gridLayout_3.addLayout(self.gridLayout_2, 0, 0, 1, 1)
        self.scrollArea.setWidget(self.scrollAreaWidgetContents)
        self.gridLayout.addWidget(self.scrollArea, 0, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 606, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))


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_())

Answer 1

你可以试着重写showPopup方法

import sys
import os
from PyQt5           import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import ( QMainWindow, QApplication, QWidget, 
                              QMessageBox, QDialog, QFileDialog)
#from frontend import Ui_MainWindow


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(606, 446)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.scrollArea = QtWidgets.QScrollArea(self.centralwidget)
        self.scrollArea.setWidgetResizable(True)
        self.scrollArea.setObjectName("scrollArea")
        self.scrollAreaWidgetContents = QtWidgets.QWidget()
        self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 586, 385))    

        self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents")

        self.gridLayout_3 = QtWidgets.QGridLayout(self.scrollAreaWidgetContents)
        self.gridLayout_3.setObjectName("gridLayout_3")
        self.gridLayout_2 = QtWidgets.QGridLayout()
        self.gridLayout_2.setObjectName("gridLayout_2")
        self.gridLayout_3.addLayout(self.gridLayout_2, 0, 0, 1, 1)
        self.scrollArea.setWidget(self.scrollAreaWidgetContents)
        self.gridLayout.addWidget(self.scrollArea, 0, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 606, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))


class ComboBox(QtWidgets.QComboBox):
    def __init__(self, parent=None):
        super().__init__(parent=parent)

        self.myList = ['AAA-{}'.format(i) for i in range(1, 15000)]  #['AAA'] * 15000

    def showPopup(self):
        self.hidePopup()

        self.addItems(self.myList)
        """ # or 
        for var in range(1, 15000): 
            self.addItem("TEST " + str(var))
        """    
        super(ComboBox, self).showPopup()


    def hidePopup(self):
        super(ComboBox, self).hidePopup()


#class Ui_MainWindow(QMainWindow, Ui_MainWindow):
class My_MainWindow(QMainWindow, Ui_MainWindow):

    def __init__(self):      
        super().__init__()   

        self.setupUi(self)

#        myList = ['AAA-{}'.format(i) for i in range(1, 1500)] #['AAA'] * 15000

        for i in range(1, 10):
            self.cb1 = ComboBox()     # QtWidgets.QComboBox()
            self.cb2 = ComboBox()     # QtWidgets.QComboBox()
            self.cb3 = ComboBox()     # QtWidgets.QComboBox()

#            self.cb1.addItems(myList)
#            self.cb2.addItems(myList)
#            self.cb3.addItems(myList)

            self.gridLayout_2.addWidget(self.cb1,i,0) # cb2
            self.gridLayout_2.addWidget(self.cb2,i,1) # cb1
            self.gridLayout_2.addWidget(self.cb3,i,2) # cb2

if __name__ == '__main__':
    app = QApplication(sys.argv)
    current_path = os.getcwd()
    app.processEvents()
    prog = My_MainWindow()                  # Ui_MainWindow()
    prog.showMaximized()
    prog.show()
    sys.exit(app.exec_())