QWidget 及其子類均支援右鍵選單功能，通過宣告 ContextMenuPolicy 啟用選單

        # self inherit QWidget
        self.setContextMenuPolicy(Qt.DefaultContextMenu)  # contextMenuEvent()
        self.setContextMenuPolicy(Qt.NoContextMenu)
        self.setContextMenuPolicy(Qt.PreventContextMenu)
        self.setContextMenuPolicy(Qt.ActionsContextMenu)
        self.setContextMenuPolicy(Qt.CustomContextMenu)  # customContextMenuRequested()
 

1、實現使用者選單 

class handler_demo(QWidget, Ui_demo):
    def __init__(self):
        super().__init__()
        self.setupUi(self)

        # self inherit QWidget
        self.table_widget.setContextMenuPolicy(Qt.CustomContextMenu)
        self.table_widget.customContextMenuRequested.connect(self.custom_right_menu)

    def custom_right_menu(self, pos):
        menu = QMenu()
        opt1 = menu.addAction("menu1")
        opt2 = menu.addAction("menu2")
        action = menu.exec_(self.table_widget.mapToGlobal(pos))
        if action == opt1:
            # do something
            return
        elif action == opt2:
            # do something
            return
        else:
            return


 

2、使用事件選單 # TODO

class handler_demo(QWidget, Ui_demo):
    def __init__(self):
        super().__init__()
        self.setupUi(self)

        # self inherit QWidget
        self.table_widget.setContextMenuPolicy(Qt.ActionsContextMenu)
        self.table_widget.customContextMenuRequested.connect(self.custom_right_menu)

    def custom_right_menu(self, pos):
        menu = QMenu()
        opt1 = menu.addAction("menu1")
        opt2 = menu.addAction("menu2")
        action = menu.exec_(self.table_widget.mapToGlobal(pos))
        if action == opt1:
            # do something
            return
        elif action == opt2:
            # do something
            return
        else:
            return

 3、重寫預設選單 # TODO

class handler_demo(QWidget, Ui_demo):
    def __init__(self):
        super().__init__()
        self.setupUi(self)

    def contextMenuEvent(self, event):
        menu = QMenu()
        opt1 = menu.addAction("menu1")
        opt2 = menu.addAction("menu2")
        action = menu.exec_(self.table_widget.mapToGlobal(event.pos()))
        if action == opt1:
            # do something
            return
        elif action == opt2:
            # do something
            return

        menu.move(event.pos())
        menu.show()

 參考資料