QMENU中Qfontcombobox整合的问题

Question

我正在尝试将Qfontcombobox集成在Qmenu中。 从菜单中选择特定字体时，我会尝试使两件事发生：

1. Qmenu将关闭。
2. 打印选定的字体。

---

from PyQt5.QtCore import QObject
from PyQt5.QtGui import QIcon, QFont, QCursor
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QFontComboBox, QWidgetAction, QMenu, QPushButton
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Pyside2 FontCombo Box")
        self.setGeometry(300,200,300,250)
        self.setFontBox()
        self.setIcon()
        self.show()
    def setIcon(self):
        appIcon = QIcon("icon.png")
        self.setWindowIcon(appIcon)
    def setFontBox(self):
        self.font_button = QPushButton(self)
        self.font_button.setFixedWidth(300)
        self.font_button.clicked.connect(lambda: self.setFontmenu())
        vbox = QVBoxLayout()
        vbox.addWidget(self.font_button)
        self.setLayout(vbox)
    def setFontmenu(self):
        font_menu = QMenu()
        font_submenu = QFontComboBox()
        font_submenu.setCurrentFont(QFont("Arial"))
        objectTest = QObject()
        widget = QWidgetAction(objectTest)
        widget.setDefaultWidget(font_submenu)
        font_menu.addAction(widget)
        font_menu.exec_(QCursor.pos())
        menu = font_menu
        menu.addSeparator()
        font_submenu.showPopup()
        font_submenu.setFocus()
        font_submenu.currentFontChanged.connect(self._changed)
    def _changed(self):
        font = self.currentFont().family()
        print(font)
        return
myapp = QApplication(sys.argv)
window = Window()
myapp.exec_()
sys.exit()