第十六篇 -- QListWidget与QToolButton（功能）

效果图：

添加的部分，就是对几个action绑定了槽函数，完成相应的功能。

listWidget操作的都是item，添加一个item，删除一个item，插入一个item等等。那么只需要知道item的几个操作方法。

• Item = QListWidgetItem()
• Item.setText("文本内容")
• Item.setCheckState(Qt.Checked) 勾选
• Item.setFlags(Qt.ItemIsSelectedable|Qt.ItemIsUserCheckable|Qt.ItemIsEnabled|Qt.ItemIsEditable)可以编辑
• listWidget.addItem(Item)添加
• listWidget.insertItem(行号，Item)插入
• listWidget.takeItem(行号)删除
• listWidget.clear()清空

ui_listWidget.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'ui_listwidget.ui'
#
# Created by: PyQt5 UI code generator 5.13.0
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 483)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.splitter = QtWidgets.QSplitter(self.centralwidget)
        self.splitter.setGeometry(QtCore.QRect(10, 10, 781, 381))
        self.splitter.setOrientation(QtCore.Qt.Horizontal)
        self.splitter.setObjectName("splitter")
        self.toolBox = QtWidgets.QToolBox(self.splitter)
        self.toolBox.setMaximumSize(QtCore.QSize(16777215, 16777215))
        self.toolBox.setObjectName("toolBox")
        self.page = QtWidgets.QWidget()
        self.page.setGeometry(QtCore.QRect(0, 0, 152, 291))
        self.page.setObjectName("page")
        self.gridLayout = QtWidgets.QGridLayout(self.page)
        self.gridLayout.setObjectName("gridLayout")
        self.btnList_Ini = QtWidgets.QToolButton(self.page)
        self.btnList_Ini.setMinimumSize(QtCore.QSize(130, 30))
        self.btnList_Ini.setObjectName("btnList_Ini")
        self.gridLayout.addWidget(self.btnList_Ini, 0, 0, 1, 1)
        self.btnList_Clear = QtWidgets.QToolButton(self.page)
        self.btnList_Clear.setMinimumSize(QtCore.QSize(130, 30))
        self.btnList_Clear.setObjectName("btnList_Clear")
        self.gridLayout.addWidget(self.btnList_Clear, 1, 0, 1, 1)
        self.btnList_Insert = QtWidgets.QToolButton(self.page)
        self.btnList_Insert.setMinimumSize(QtCore.QSize(130, 30))
        self.btnList_Insert.setObjectName("btnList_Insert")
        self.gridLayout.addWidget(self.btnList_Insert, 2, 0, 1, 1)
        self.btnList_Append = QtWidgets.QToolButton(self.page)
        self.btnList_Append.setMinimumSize(QtCore.QSize(130, 30))
        self.btnList_Append.setObjectName("btnList_Append")
        self.gridLayout.addWidget(self.btnList_Append, 3, 0, 1, 1)
        self.btnList_Delete = QtWidgets.QToolButton(self.page)
        self.btnList_Delete.setMinimumSize(QtCore.QSize(130, 30))
        self.btnList_Delete.setObjectName("btnList_Delete")
        self.gridLayout.addWidget(self.btnList_Delete, 4, 0, 1, 1)
        icon = QtGui.QIcon()
        icon.addPixmap(QtGui.QPixmap("Image/icons/list.ico"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.toolBox.addItem(self.page, icon, "")
        self.page_2 = QtWidgets.QWidget()
        self.page_2.setGeometry(QtCore.QRect(0, 0, 152, 291))
        self.page_2.setObjectName("page_2")
        icon1 = QtGui.QIcon()
        icon1.addPixmap(QtGui.QPixmap("Image/icons/tree.ico"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.toolBox.addItem(self.page_2, icon1, "")
        self.page_3 = QtWidgets.QWidget()
        self.page_3.setObjectName("page_3")
        icon2 = QtGui.QIcon()
        icon2.addPixmap(QtGui.QPixmap("Image/icons/tabel.ico"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.toolBox.addItem(self.page_3, icon2, "")
        self.tabWidget = QtWidgets.QTabWidget(self.splitter)
        self.tabWidget.setObjectName("tabWidget")
        self.tab = QtWidgets.QWidget()
        self.tab.setObjectName("tab")
        self.gridLayout_2 = QtWidgets.QGridLayout(self.tab)
        self.gridLayout_2.setObjectName("gridLayout_2")
        self.btnSel_None = QtWidgets.QToolButton(self.tab)
        self.btnSel_None.setObjectName("btnSel_None")
        self.gridLayout_2.addWidget(self.btnSel_None, 1, 3, 1, 1)
        self.checkBox = QtWidgets.QCheckBox(self.tab)
        font = QtGui.QFont()
        font.setPointSize(10)
        self.checkBox.setFont(font)
        self.checkBox.setObjectName("checkBox")
        self.gridLayout_2.addWidget(self.checkBox, 0, 6, 1, 1)
        self.listWidget = QtWidgets.QListWidget(self.tab)
        self.listWidget.setObjectName("listWidget")
        item = QtWidgets.QListWidgetItem()
        item.setFlags(QtCore.Qt.ItemIsSelectable|QtCore.Qt.ItemIsEditable|QtCore.Qt.ItemIsDragEnabled|QtCore.Qt.ItemIsUserCheckable|QtCore.Qt.ItemIsEnabled)
        self.listWidget.addItem(item)
        item = QtWidgets.QListWidgetItem()
        item.setFlags(QtCore.Qt.ItemIsSelectable|QtCore.Qt.ItemIsEditable|QtCore.Qt.ItemIsDragEnabled|QtCore.Qt.ItemIsUserCheckable|QtCore.Qt.ItemIsEnabled)
        self.listWidget.addItem(item)
        self.gridLayout_2.addWidget(self.listWidget, 2, 0, 1, 7)
        self.label = QtWidgets.QLabel(self.tab)
        font = QtGui.QFont()
        font.setPointSize(10)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.gridLayout_2.addWidget(self.label, 0, 0, 1, 1)
        self.lineEdit = QtWidgets.QLineEdit(self.tab)
        self.lineEdit.setObjectName("lineEdit")
        self.gridLayout_2.addWidget(self.lineEdit, 0, 1, 1, 5)
        self.btnSel_ALL = QtWidgets.QToolButton(self.tab)
        self.btnSel_ALL.setObjectName("btnSel_ALL")
        self.gridLayout_2.addWidget(self.btnSel_ALL, 1, 2, 1, 1)
        self.btnSel_Invs = QtWidgets.QToolButton(self.tab)
        self.btnSel_Invs.setObjectName("btnSel_Invs")
        self.gridLayout_2.addWidget(self.btnSel_Invs, 1, 4, 1, 1)
        self.btnSelectItem = QtWidgets.QToolButton(self.tab)
        self.btnSelectItem.setObjectName("btnSelectItem")
        self.gridLayout_2.addWidget(self.btnSelectItem, 1, 0, 1, 2)
        self.tabWidget.addTab(self.tab, "")
        self.tab_2 = QtWidgets.QWidget()
        self.tab_2.setObjectName("tab_2")
        self.tabWidget.addTab(self.tab_2, "")
        self.tab_3 = QtWidgets.QWidget()
        self.tab_3.setObjectName("tab_3")
        self.tabWidget.addTab(self.tab_3, "")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.toolBar = QtWidgets.QToolBar(MainWindow)
        self.toolBar.setToolButtonStyle(QtCore.Qt.ToolButtonTextUnderIcon)
        self.toolBar.setObjectName("toolBar")
        MainWindow.addToolBar(QtCore.Qt.TopToolBarArea, self.toolBar)
        self.actList_Ini = QtWidgets.QAction(MainWindow)
        icon3 = QtGui.QIcon()
        icon3.addPixmap(QtGui.QPixmap("Image/icons/initial.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.actList_Ini.setIcon(icon3)
        self.actList_Ini.setObjectName("actList_Ini")
        self.actList_Clear = QtWidgets.QAction(MainWindow)
        icon4 = QtGui.QIcon()
        icon4.addPixmap(QtGui.QPixmap("Image/icons/clear.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.actList_Clear.setIcon(icon4)
        self.actList_Clear.setObjectName("actList_Clear")
        self.actList_Insert = QtWidgets.QAction(MainWindow)
        icon5 = QtGui.QIcon()
        icon5.addPixmap(QtGui.QPixmap("Image/icons/insert.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.actList_Insert.setIcon(icon5)
        self.actList_Insert.setObjectName("actList_Insert")
        self.actList_Append = QtWidgets.QAction(MainWindow)
        icon6 = QtGui.QIcon()
        icon6.addPixmap(QtGui.QPixmap("Image/icons/append.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.actList_Append.setIcon(icon6)
        self.actList_Append.setObjectName("actList_Append")
        self.actList_Delete = QtWidgets.QAction(MainWindow)
        icon7 = QtGui.QIcon()
        icon7.addPixmap(QtGui.QPixmap("Image/icons/delete.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.actList_Delete.setIcon(icon7)
        self.actList_Delete.setObjectName("actList_Delete")
        self.actSel_ALL = QtWidgets.QAction(MainWindow)
        self.actSel_ALL.setObjectName("actSel_ALL")
        self.actSel_None = QtWidgets.QAction(MainWindow)
        self.actSel_None.setObjectName("actSel_None")
        self.actSel_Invs = QtWidgets.QAction(MainWindow)
        self.actSel_Invs.setObjectName("actSel_Invs")
        self.actQuit = QtWidgets.QAction(MainWindow)
        icon8 = QtGui.QIcon()
        icon8.addPixmap(QtGui.QPixmap("Image/icons/quit.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.actQuit.setIcon(icon8)
        self.actQuit.setObjectName("actQuit")
        self.actSelPopMenu = QtWidgets.QAction(MainWindow)
        icon9 = QtGui.QIcon()
        icon9.addPixmap(QtGui.QPixmap("Image/icons/popmenu.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.actSelPopMenu.setIcon(icon9)
        self.actSelPopMenu.setObjectName("actSelPopMenu")
        self.toolBar.addAction(self.actList_Ini)
        self.toolBar.addAction(self.actList_Clear)
        self.toolBar.addAction(self.actList_Insert)
        self.toolBar.addAction(self.actList_Append)
        self.toolBar.addAction(self.actList_Delete)

        self.retranslateUi(MainWindow)
        self.toolBox.setCurrentIndex(0)
        self.tabWidget.setCurrentIndex(0)
        self.actSelPopMenu.triggered.connect(self.actSel_Invs.trigger)
        self.actQuit.triggered.connect(MainWindow.close)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.btnList_Ini.setText(_translate("MainWindow", "btnList_Ini"))
        self.btnList_Clear.setText(_translate("MainWindow", "btnList_Clear"))
        self.btnList_Insert.setText(_translate("MainWindow", "btnList_Insert"))
        self.btnList_Append.setText(_translate("MainWindow", "btnList_Append"))
        self.btnList_Delete.setText(_translate("MainWindow", "btnList_Delete"))
        self.toolBox.setItemText(self.toolBox.indexOf(self.page), _translate("MainWindow", "QListWidget操作"))
        self.toolBox.setItemText(self.toolBox.indexOf(self.page_2), _translate("MainWindow", "QTreeWidget"))
        self.toolBox.setItemText(self.toolBox.indexOf(self.page_3), _translate("MainWindow", "QTabelWidget"))
        self.btnSel_None.setText(_translate("MainWindow", "btnSel_None"))
        self.checkBox.setText(_translate("MainWindow", "可编辑"))
        __sortingEnabled = self.listWidget.isSortingEnabled()
        self.listWidget.setSortingEnabled(False)
        item = self.listWidget.item(0)
        item.setText(_translate("MainWindow", "New Item"))
        item = self.listWidget.item(1)
        item.setText(_translate("MainWindow", "New Item1"))
        self.listWidget.setSortingEnabled(__sortingEnabled)
        self.label.setText(_translate("MainWindow", "当前项变化"))
        self.btnSel_ALL.setText(_translate("MainWindow", "btnSel_ALL"))
        self.btnSel_Invs.setText(_translate("MainWindow", "btnSel_Invs"))
        self.btnSelectItem.setText(_translate("MainWindow", "btnSelectItem"))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab), _translate("MainWindow", "QListWidget"))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_2), _translate("MainWindow", "QTreeWidget"))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_3), _translate("MainWindow", "QTableWidget"))
        self.toolBar.setWindowTitle(_translate("MainWindow", "toolBar"))
        self.actList_Ini.setText(_translate("MainWindow", "初始化列表"))
        self.actList_Ini.setToolTip(_translate("MainWindow", "初始化列表"))
        self.actList_Ini.setShortcut(_translate("MainWindow", "Ctrl+I"))
        self.actList_Clear.setText(_translate("MainWindow", "清除列表"))
        self.actList_Clear.setToolTip(_translate("MainWindow", "清除列表"))
        self.actList_Insert.setText(_translate("MainWindow", "插入项"))
        self.actList_Insert.setToolTip(_translate("MainWindow", "插入项"))
        self.actList_Insert.setShortcut(_translate("MainWindow", "Ctrl+S"))
        self.actList_Append.setText(_translate("MainWindow", "添加项"))
        self.actList_Append.setToolTip(_translate("MainWindow", "添加项"))
        self.actList_Append.setShortcut(_translate("MainWindow", "Ctrl+A"))
        self.actList_Delete.setText(_translate("MainWindow", "删除当前项"))
        self.actList_Delete.setToolTip(_translate("MainWindow", "删除当前项"))
        self.actList_Delete.setShortcut(_translate("MainWindow", "Del"))
        self.actSel_ALL.setText(_translate("MainWindow", "全选"))
        self.actSel_ALL.setToolTip(_translate("MainWindow", "全选"))
        self.actSel_None.setText(_translate("MainWindow", "全不选"))
        self.actSel_None.setToolTip(_translate("MainWindow", "全不选"))
        self.actSel_Invs.setText(_translate("MainWindow", "反选"))
        self.actSel_Invs.setToolTip(_translate("MainWindow", "反选"))
        self.actQuit.setText(_translate("MainWindow", "退出"))
        self.actQuit.setToolTip(_translate("MainWindow", "退出程序"))
        self.actSelPopMenu.setText(_translate("MainWindow", "项选择"))
        self.actSelPopMenu.setToolTip(_translate("MainWindow", "项选择"))

myMainWindow_listWidget.py

#!/usr/bin/env python
# _*_ coding: UTF-8 _*_
"""=================================================
@Project -> File    : Operate-system -> myMainWindow_listwidget.py
@IDE     : PyCharm
@Author  : zihan
@Date    : 2020/4/14 9:24
@Desc    :
================================================="""

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QListWidgetItem, QMenu, QToolButton
from PyQt5.QtGui import QIcon, QCursor
from PyQt5.QtCore import pyqtSlot, Qt
from ui_listwidget import Ui_MainWindow

class QmyMainWindow(QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        self.setCentralWidget(self.ui.splitter)  # 使splitter充满整个工作区
        self.__set_actions_for_button()  # ToolButton关联Action
        self.__create_selection_pop_menu()
        self.__FlagEditable = Qt.ItemIsSelectable | Qt.ItemIsUserCheckable | Qt.ItemIsEnabled | Qt.ItemIsEditable
        self.__FlagNotEditable = Qt.ItemIsSelectable | Qt.ItemIsUserCheckable | Qt.ItemIsEnabled

        self.ui.listWidget.setContextMenuPolicy(Qt.CustomContextMenu)

        # 初始化列表
        self.ui.actList_Ini.triggered.connect(self.do_act_list_ini_triggered)
        # 插入一项
        self.ui.actList_Insert.triggered.connect(self.do_act_list_insert_triggered)
        # 添加一项
        self.ui.actList_Append.triggered.connect(self.do_act_list_append_triggered)
        # 删除当前项
        self.ui.actList_Delete.triggered.connect(self.do_act_list_delete_triggered)
        # 清空列表
        self.ui.actList_Clear.triggered.connect(self.do_act_list_clear_triggered)

        # 全选
        self.ui.actSel_ALL.triggered.connect(self.do_act_sel_all_triggered)
        # 全不选
        self.ui.actSel_None.triggered.connect(self.do_act_sel_none_triggered)
        # 反选
        self.ui.actSel_Invs.triggered.connect(self.do_act_sel_invs_triggered)
        # 当选择项发生变化时
        self.ui.listWidget.currentItemChanged.connect(self.do_list_widget_current_item_changed)
        # 右键快捷菜单
        self.ui.listWidget.customContextMenuRequested.connect(self.do_list_widget_custom_context_menu_requested)

    # ToolButton关联Action
    def __set_actions_for_button(self):
        self.ui.btnList_Ini.setDefaultAction(self.ui.actList_Ini)
        self.ui.btnList_Clear.setDefaultAction(self.ui.actList_Clear)

        self.ui.btnList_Insert.setDefaultAction(self.ui.actList_Insert)
        self.ui.btnList_Append.setDefaultAction(self.ui.actList_Append)
        self.ui.btnList_Delete.setDefaultAction(self.ui.actList_Delete)

        self.ui.btnSel_ALL.setDefaultAction(self.ui.actSel_ALL)
        self.ui.btnSel_None.setDefaultAction(self.ui.actSel_None)
        self.ui.btnSel_Invs.setDefaultAction(self.ui.actSel_Invs)

        self.ui.btnList_Ini.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        self.ui.btnList_Clear.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        self.ui.btnList_Insert.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        self.ui.btnList_Append.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        self.ui.btnList_Delete.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)

    # 创建ToolButton按钮的下拉菜单
    def __create_selection_pop_menu(self):
        menuSelection = QMenu(self)  # 下拉菜单
        menuSelection.addAction(self.ui.actSel_ALL)
        menuSelection.addAction(self.ui.actSel_None)
        menuSelection.addAction(self.ui.actSel_Invs)

        # listWidget上方的btnSelectItem按钮
        self.ui.btnSelectItem.setPopupMode(QToolButton.MenuButtonPopup)
        self.ui.btnSelectItem.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        self.ui.btnSelectItem.setDefaultAction(self.ui.actSelPopMenu)
        self.ui.btnSelectItem.setMenu(menuSelection)  # 设置下拉菜单

        # 工具栏上的下拉式菜单按钮
        toolBtn = QToolButton(self)
        toolBtn.setPopupMode(QToolButton.InstantPopup)
        toolBtn.setDefaultAction(self.ui.actSelPopMenu)
        toolBtn.setToolButtonStyle(Qt.ToolButtonTextUnderIcon)
        toolBtn.setMenu(menuSelection)  # 设置下拉菜单
        self.ui.toolBar.addWidget(toolBtn)

        # 工具栏添加分隔条和"退出"按钮
        self.ui.toolBar.addSeparator()
        self.ui.toolBar.addAction(self.ui.actQuit)

    # 初始化列表
    def do_act_list_ini_triggered(self):
        editable = self.ui.checkBox.isChecked()
        if editable:
            Flag = self.__FlagEditable  # 可编辑
        else:
            Flag = self.__FlagNotEditable  # 不可编辑
        self.ui.listWidget.clear()  # 清除列表
        for i in range(10):
            itemStr = "Item %d" % i
            aItem = QListWidgetItem()
            aItem.setText(itemStr)
            aItem.setCheckState(Qt.Checked)
            aItem.setFlags(Flag)  # 项的Flag
            self.ui.listWidget.addItem(aItem)

    # 插入一项
    def do_act_list_insert_triggered(self):
        editable = self.ui.checkBox.isChecked()
        if editable:
            Flag = self.__FlagEditable
        else:
            Flag = self.__FlagNotEditable
        aItem = QListWidgetItem()
        aItem.setText("Insert Item")
        aItem.setCheckState(Qt.Checked)
        aItem.setFlags(Flag)
        curRow = self.ui.listWidget.currentRow()  # 当前行
        self.ui.listWidget.insertItem(curRow, aItem)

    # 添加一项
    def do_act_list_append_triggered(self):
        editable = self.ui.checkBox.isChecked()
        if editable:
            Flag = self.__FlagEditable
        else:
            Flag = self.__FlagNotEditable
        aItem = QListWidgetItem()
        aItem.setText("Append Item")
        aItem.setCheckState(Qt.Checked)
        aItem.setFlags(Flag)
        self.ui.listWidget.addItem(aItem)

    # 删除当前项
    def do_act_list_delete_triggered(self):
        row = self.ui.listWidget.currentRow()
        self.ui.listWidget.takeItem(row)  # 移出当前项，Python自动删除

    # 清空列表
    def do_act_list_clear_triggered(self):
        self.ui.listWidget.clear()

    # 全选
    def do_act_sel_all_triggered(self):
        for i in range(self.ui.listWidget.count()):
            aItem = self.ui.listWidget.item(i)
            aItem.setCheckState(Qt.Checked)

    # 全不选
    def do_act_sel_none_triggered(self):
        for i in range(self.ui.listWidget.count()):
            aItem = self.ui.listWidget.item(i)
            aItem.setCheckState(Qt.Unchecked)

    # 反选
    def do_act_sel_invs_triggered(self):
        for i in range(self.ui.listWidget.count()):
            aItem = self.ui.listWidget.item(i)
            if aItem.checkState() != Qt.Checked:
                aItem.setCheckState(Qt.Checked)
            else:
                aItem.setCheckState(Qt.Unchecked)

    # 当选择项发生变化时
    def do_list_widget_current_item_changed(self, current, previous):
        strInfo = ""
        if current is not None:
            if previous is None:
                strInfo = "当前：" + current.text()
            else:
                strInfo = "前一项：" + previous.text() + "；当前项：" + current.text()
        self.ui.lineEdit.setText(strInfo)

    # 右键快捷菜单
    def do_list_widget_custom_context_menu_requested(self, pos):
        print("aaa")
        menuList = QMenu(self)  # 创建菜单
        menuList.addAction(self.ui.actList_Ini)
        menuList.addAction(self.ui.actList_Clear)
        menuList.addAction(self.ui.actList_Insert)
        menuList.addAction(self.ui.actList_Append)
        menuList.addAction(self.ui.actList_Delete)
        menuList.addSeparator()
        menuList.addAction(self.ui.actSel_ALL)
        menuList.addAction(self.ui.actSel_None)
        menuList.addAction(self.ui.actSel_Invs)
        menuList.exec(QCursor.pos())  # 显示菜单

if __name__ == "__main__":
    app = QApplication(sys.argv)  # 创建app，用QApplication类
    form = QmyMainWindow()
    form.show()
    sys.exit(app.exec_())

值得注意的是，如果遇到了添加右键快捷菜单时，在组件上单击右键没有触发信号的话，考虑没有添加右键菜单策略，这时候在__init__()函数中添加一句self.ui.listWidget.setContextMenuPolicy(Qt.CustomContextMenu)。

问题参考链接：https://blog.csdn.net/Wangguang_/article/details/91550394

ok.