QAction切换受到QMenu mousePressEvent的阻碍

Question

我有一个嵌套的菜单项，我试图在其中使所有项都可检查。最初，切换不适用于主项(设置为 QAction的 QMenu(，而它适用于子项。

但是在使用mousePressEvent后，切换现在适用于主项，但不适用于子项。

尝试复制我对子项目功能的主要项目所做的工作，但切换仍然不起作用。似乎，它在_callActionItem()中被称为两次.

但是，由于某些原因，如果子项窗口处于撕下模式，则可以切换，但如果在工具本身中执行右键单击菜单，则无法切换。

此外，如果我在 QCustomMenu 中禁用mousePressEvent，我又回到了原点，其中切换适用于子项目但不适用于主要项目

class QSubAction(QtGui.QAction):
    def __init__(self, text="", parent=None):
        super(QSubAction, self).__init__(text, parent)
        self.setCheckable(True)
        self.setChecked(True)

class QAddAction(QtGui.QAction):
    def __init__(self, icon=None, text="Add Item", parent=None):
        if icon:
            super(QAddAction, self).__init__(icon, text, parent)
        else:
            super(QAddAction, self).__init__(text, parent)
class QCustomMenu(QtGui.QMenu):
    """Customized QMenu."""
    def __init__(self, title, parent=None):
        super(QCustomMenu, self).__init__(title=str(title), parent=parent)
        self.setup_menu()
    def mousePressEvent(self, event):
        action = self.activeAction()
        if isinstance(action, QtGui.QAction):
            action.trigger()
        return QtGui.QMenu.mousePressEvent(self, event)
    def setup_menu(self):
        self.setContextMenuPolicy(QtCore.Qt.DefaultContextMenu)
    def contextMenuEvent(self, event):
        no_right_click = [QAddAction]
        if any([isinstance(self.actionAt(event.pos()), instance) for instance in no_right_click]):
            return
        pos = event.pos()
    def addAction(self, action):
        super(QCustomMenu, self).addAction(action)

class Example(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(Example, self).__init__(parent)
        self.initUI()
    def initUI(self):         
        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Context menu')   
        self.qmenu = QCustomMenu(title='', parent=self)
        add_item_action = QtGui.QAction('Add Main item', self,
            triggered=self.add_new_item)
        self.qmenu.addAction(add_item_action)
    def contextMenuEvent(self, event):
        action = self.qmenu.exec_(self.mapToGlobal(event.pos()))
    def add_new_item(self):
        main_menu_name, ok = QtGui.QInputDialog.getText(
            self,
            'Main Menu',
            'Name of new Menu Item:'
        )
        if ok:
            self._addMenuItemTest(main_menu_name)
    def _addMenuItemTest(self, main_menu_name):
        icon_path = '/user_data/add.png'
        base_qmenu = QCustomMenu(title=main_menu_name, parent=self)
        base_qmenu.setTearOffEnabled(True)                     
        add_item_action = QAddAction(None, 'Add Sub Item', base_qmenu)
        slot = functools.partial(self.add_sub_item, base_qmenu)
        add_item_action.triggered.connect(slot)
        base_qmenu.addAction(add_item_action)
        test_action = QtGui.QAction(main_menu_name, self)
        test_action.setMenu(base_qmenu)
        test_action.setCheckable(True)
        test_action.setChecked(True)
        self.connect(
            test_action,
            QtCore.SIGNAL("triggered(bool)"),
            self.main_toggling
        )
        self.qmenu.addAction(test_action)
    def main_toggling(self, check_state):
        sender_obj = self.sender()
        if isinstance(sender_obj, QtGui.QAction):
            sender_obj.setChecked(check_state)
    def add_sub_item(self, base_menu):
        sub_menu_name, ok = QtGui.QInputDialog.getText(
            self,
            'Sub Menu',
            'Name of new Sub Item:'
        )
        if ok:
            action = QSubAction(sub_menu_name, self)
            slot = functools.partial(
                self._callActionItem,
                action
            )
            # action.toggled.connect(slot)
            # from pprint import pprint
            # pprint(help(action))
            # action.connect(action, QtCore.SIGNAL("triggered(bool)"), self._callActionItem)
            base_menu.addAction(action)
    def _callActionItem(self, action):
        # This is called twice, False and True again
        print '>>> sub check-state : ', action.isChecked()

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    window = Example()
    window.show()
    sys.exit(app.exec_())

Answer 1

默认情况下，

QMenu 只会使没有子项可以检查的 QAction，因此您做了一个技巧来启用另一个不符合上述可能会影响操作的 QAction 的功能，这就是您的情况。解决方案是区分按下的QAction类型：

def mousePressEvent(self, event):
    action = self.activeAction()
    if not isinstance(action, QSubAction) and action is not None:
        action.trigger()
        return
    return QtGui.QMenu.mousePressEvent(self, event)