PyQt5 QTableWidget 右键单击​​单元格不会生成 QMenu

Question

我的程序有一个表格，并且希望能够右键单击该表格中的一个单元格，并生成适当的操作来操作该单元格（不同单元格的不同操作集）。我的测试代码只有一个生成表格的小部件，在视口上安装一个事件过滤器以找出右键单击了哪个单元格。

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QAction, QMenu, QTableWidget, QTableWidgetItem, QVBoxLayout
from PyQt5 import QtCore


class TestRightClickTableWidget(QWidget):

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

        self.tableWidget = QTableWidget()
        self.tableWidget.setRowCount(4)
        self.tableWidget.setColumnCount(2)
        self.tableWidget.setItem(0, 0, QTableWidgetItem("Cell 1"))
        self.tableWidget.setItem(0, 1, QTableWidgetItem("Cell 2"))
        self.tableWidget.setItem(1, 0, QTableWidgetItem("Cell 3"))
        self.tableWidget.setItem(1, 1, QTableWidgetItem("Cell 4"))
        self.tableWidget.setItem(2, 0, QTableWidgetItem("Cell 5"))
        self.tableWidget.setItem(2, 1, QTableWidgetItem("Cell 6"))
        self.tableWidget.setItem(3, 0, QTableWidgetItem("Cell 7"))
        self.tableWidget.setItem(3, 1, QTableWidgetItem("Cell 8"))

        self.tableWidget.viewport().installEventFilter(self)

        self.layout = QVBoxLayout()
        self.layout.addWidget(self.tableWidget)
        self.setLayout(self.layout)

    def eventFilter(self, source, event):
        if(event.type() == QtCore.QEvent.MouseButtonPress and
           event.buttons() == QtCore.Qt.RightButton and
           source is self.tableWidget.viewport()):
            item = self.tableWidget.itemAt(event.pos())
            print('Global Pos:', event.globalPos())
            if item is not None:
                print('Table Item:', item.row(), item.column())
                menu = QMenu(self)
                menu.addAction(QAction('test'))
                menu.exec_(event.globalPos())
        return super(TestRightClickTableWidget, self).eventFilter(source, event)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = TestRightClickTableWidget()
    ex.show()
    sys.exit(app.exec_())

这样我就可以找到正确的单元格以及在菜单上运行 exec_ 的全局位置。但菜单不会显示在屏幕上。我想知道这是否是一个 Qt 错误，菜单不会在表格中生成，或者我没有正确创建/执行菜单。任何帮助，将不胜感激。谢谢。

Answer 1

尝试一下：

import sys
from PyQt5.QtWidgets import (QApplication, QWidget, QAction, QMenu, QTableWidget, 
                             QMainWindow, QTableWidgetItem, QVBoxLayout, )
from PyQt5 import QtCore


class TestRightClickTableWidget(QWidget): #(QMainWindow):   # (QWidget): #

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

        self.tableWidget = QTableWidget()
        self.tableWidget.setRowCount(4)
        self.tableWidget.setColumnCount(2)
        self.tableWidget.setItem(0, 0, QTableWidgetItem("Cell 1"))
        self.tableWidget.setItem(0, 1, QTableWidgetItem("Cell 2"))
        self.tableWidget.setItem(1, 0, QTableWidgetItem("Cell 3"))
        self.tableWidget.setItem(1, 1, QTableWidgetItem("Cell 4"))
        self.tableWidget.setItem(2, 0, QTableWidgetItem("Cell 5"))
        self.tableWidget.setItem(2, 1, QTableWidgetItem("Cell 6"))
        self.tableWidget.setItem(3, 0, QTableWidgetItem("Cell 7"))
        self.tableWidget.setItem(3, 1, QTableWidgetItem("Cell 8"))
        
        ### This property holds how the widget shows a context menu
        self.tableWidget.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)     # +++
        ### This signal is emitted when the widget's contextMenuPolicy is Qt::CustomContextMenu, 
        ### and the user has requested a context menu on the widget. 
        self.tableWidget.customContextMenuRequested.connect(self.generateMenu) # +++

        self.tableWidget.viewport().installEventFilter(self)

        self.layout = QVBoxLayout() 
        self.layout.addWidget(self.tableWidget)
        self.setLayout(self.layout)

    def eventFilter(self, source, event):
        if(event.type() == QtCore.QEvent.MouseButtonPress and
           event.buttons() == QtCore.Qt.RightButton and
           source is self.tableWidget.viewport()):
            item = self.tableWidget.itemAt(event.pos())
            print('Global Pos:', event.globalPos())
            if item is not None:
                print('Table Item:', item.row(), item.column())
                self.menu = QMenu(self)
                self.menu.addAction(item.text())         #(QAction('test'))
                #menu.exec_(event.globalPos())
        return super(TestRightClickTableWidget, self).eventFilter(source, event)

    ### +++    
    def generateMenu(self, pos):
        print("pos======",pos)
        self.menu.exec_(self.tableWidget.mapToGlobal(pos))   # +++

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = TestRightClickTableWidget()
    ex.show()
    sys.exit(app.exec_())