python - 将 QMenuBar 添加到 QWidget

Question

我正在尝试将 QMenubar 集成到 Python3 中 Pyside2 中的 QWidget 中。将 QMenubar 集成到 QMainWindow 似乎更容易，但我使用 QWidget 而不是 QMainWindow 开始项目，这就是为什么我想为 QWidget 提供解决方案。

当我运行代码时，没有错误消息，但是当我运行应用程序时菜单栏没有出现。我检查了stackoveflow页面，但它没有帮助我或者我无法实现它。

代码

from PySide2.QtWidgets import (QWidget, QApplication, QGraphicsView, 
QGridLayout)
from PySide2 import QtCore, QtWidgets, QtGui
from PySide2.QtOpenGL import *
from PySide2.QtCore import *
from PySide2.QtGui import *

image_path_str='image.jpg'

class View(QGraphicsView):
    photo_clicked = QtCore.Signal(QtCore.QPoint)

    def __init__(self, parent):
        super(View, self).__init__()
        self.scene = QtWidgets.QGraphicsScene(self)
        self.photo = QtWidgets.QGraphicsPixmapItem()
        self.scene.addItem(self.photo)
        self.pixmap = QtGui.QPixmap(image_path_str)
        self.photo.setPixmap(self.pixmap)
        self.setScene(self.scene)
        self.setDragMode(QGraphicsView.ScrollHandDrag)

class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        self.view = View(self)

        self.layout_contain_P1_P2 = QtWidgets.QGridLayout()
        self.checkbox_P1= QtWidgets.QCheckBox("P1",self)
        self.line_edit_P1_x = QtWidgets.QLineEdit(self)
        self.line_edit_P1_x.setReadOnly(True)
        self.line_edit_P1_y = QtWidgets.QLineEdit(self)
        self.line_edit_P1_y.setReadOnly(True)

        self.menubar = QtWidgets.QMenuBar()
        self.archive = self.menubar.addMenu("archive")
        self.menubar.setObjectName("menubar")

        self.layout_contain_P1_P2.addWidget(self.checkbox_P1, 0, 0, Qt.AlignLeft)

        self.grid_layout_P1_x_y = QtWidgets.QGridLayout()
        self.grid_layout_P1_x_y.addWidget(self.line_edit_P1_x, 1, 0, Qt.AlignLeft)
        self.grid_layout_P1_x_y.addWidget(self.line_edit_P1_y, 2, 0, Qt.AlignLeft)

        self.layout_contain_P1_P2.addLayout(self.grid_layout_P1_x_y, 0, 1, 1, 1)
        self.checkbox_P2 = QtWidgets.QCheckBox("P2",self)
        self.line_edit_P2_x = QtWidgets.QLineEdit(self)
        self.line_edit_P2_x.setReadOnly(True)
        self.line_edit_P2_y = QtWidgets.QLineEdit(self)
        self.line_edit_P2_y.setReadOnly(True)

        self.layout_contain_P1_P2.addWidget(self.checkbox_P2, 1, 0, Qt.AlignLeft)
        self.grid_layout_P2_x_y = QtWidgets.QGridLayout()

        self.grid_layout_P2_x_y.addWidget(self.line_edit_P2_x, 0, 0, Qt.AlignLeft)
        self.grid_layout_P2_x_y.addWidget(self.line_edit_P2_y, 1, 0, Qt.AlignLeft)

        self.layout_contain_P1_P2.addLayout(self.grid_layout_P2_x_y, 1, 1, Qt.AlignLeft)

        self.combo_box1 = QtWidgets.QComboBox(self)
        self.combo_box1.addItem("measurements set 1")
        self.combo_box1.addItem("measurements set 1")

        self.combo_box2 = QtWidgets.QComboBox(self)
        self.combo_box2.addItem("P1-P2")
        self.combo_box2.addItem("P3-P4")

        self.vertical1= QtWidgets.QVBoxLayout()

        self.vertical1.addWidget(self.menubar)
        self.vertical1.addWidget(self.combo_box1)
        self.vertical1.addWidget(self.combo_box2)
        self.vertical1.addLayout(self.layout_contain_P1_P2)

        self.vertical2= QtWidgets.QVBoxLayout()
        self.vertical2.addWidget(self.view)

        self.horizontal= QtWidgets.QHBoxLayout()
        self.horizontal.addLayout(self.vertical1)
        self.horizontal.addLayout(self.vertical2)

        self.setLayout(self.horizontal)
        self.setWindowTitle("Image viewer")
        self.setGeometry(200, 200, 1000, 800)

app = QApplication.instance()
if app is None:
        app = QApplication([])
w = Window()
w.show()
w.raise_()
QApplication.setOverrideCursor(QCursor(Qt.CrossCursor))
app.exec_()

这是我得到的截图：

编辑：不是最佳解决方法：添加 QMainWindow 类

这不是最佳解决方法。我不得不添加一个额外的并从内部class QMainWindow调用WidgetQMainWindow

from PySide2.QtWidgets import (QWidget, QApplication, QGraphicsView,
QGridLayout, QMainWindow, QAction, QMenu)
from PySide2 import QtCore, QtWidgets, QtGui
from PySide2.QtOpenGL import *
from PySide2.QtCore import *
from PySide2.QtGui import *

image_path_str='image.jpg'

class View(QGraphicsView):
    photo_clicked = QtCore.Signal(QtCore.QPoint)

    def __init__(self, parent):
        super(View, self).__init__()
        self.scene = QtWidgets.QGraphicsScene(self)
        self.photo = QtWidgets.QGraphicsPixmapItem()
        self.scene.addItem(self.photo)
        self.pixmap = QtGui.QPixmap(image_path_str)
        self.photo.setPixmap(self.pixmap)
        self.setScene(self.scene)
        self.setDragMode(QGraphicsView.ScrollHandDrag)

class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        self.view = View(self)

        self.layout_contain_P1_P2 = QtWidgets.QGridLayout()
        self.checkbox_P1= QtWidgets.QCheckBox("P1",self)
        self.line_edit_P1_x = QtWidgets.QLineEdit(self)
        self.line_edit_P1_x.setReadOnly(True)
        self.line_edit_P1_y = QtWidgets.QLineEdit(self)
        self.line_edit_P1_y.setReadOnly(True)

        self.layout_contain_P1_P2.addWidget(self.checkbox_P1, 0, 0, Qt.AlignLeft)

        self.grid_layout_P1_x_y = QtWidgets.QGridLayout()
        self.grid_layout_P1_x_y.addWidget(self.line_edit_P1_x, 1, 0, Qt.AlignLeft)
        self.grid_layout_P1_x_y.addWidget(self.line_edit_P1_y, 2, 0, Qt.AlignLeft)

        self.layout_contain_P1_P2.addLayout(self.grid_layout_P1_x_y, 0, 1, 1, 1)
        self.checkbox_P2 = QtWidgets.QCheckBox("P2",self)
        self.line_edit_P2_x = QtWidgets.QLineEdit(self)
        self.line_edit_P2_x.setReadOnly(True)
        self.line_edit_P2_y = QtWidgets.QLineEdit(self)
        self.line_edit_P2_y.setReadOnly(True)

        self.layout_contain_P1_P2.addWidget(self.checkbox_P2, 1, 0, Qt.AlignLeft)
        self.grid_layout_P2_x_y = QtWidgets.QGridLayout()

        self.grid_layout_P2_x_y.addWidget(self.line_edit_P2_x, 0, 0, Qt.AlignLeft)
        self.grid_layout_P2_x_y.addWidget(self.line_edit_P2_y, 1, 0, Qt.AlignLeft)

        self.layout_contain_P1_P2.addLayout(self.grid_layout_P2_x_y, 1, 1, Qt.AlignLeft)

        self.combo_box1 = QtWidgets.QComboBox(self)
        self.combo_box1.addItem("measurements set 1")
        self.combo_box1.addItem("measurements set 1")

        self.combo_box2 = QtWidgets.QComboBox(self)
        self.combo_box2.addItem("P1-P2")
        self.combo_box2.addItem("P3-P4")

        self.vertical1= QtWidgets.QVBoxLayout()

        # self.vertical1.addWidget(self.menubar)
        self.vertical1.addWidget(self.combo_box1)
        self.vertical1.addWidget(self.combo_box2)
        self.vertical1.addLayout(self.layout_contain_P1_P2)

        self.vertical2= QtWidgets.QVBoxLayout()
        self.vertical2.addWidget(self.view)

        self.horizontal= QtWidgets.QHBoxLayout()
        self.horizontal.addLayout(self.vertical1)
        self.horizontal.addLayout(self.vertical2)

        self.setLayout(self.horizontal)
        self.setWindowTitle("Image viewer")
        self.setGeometry(200, 200, 1000, 800)

class Main_window(QMainWindow):

    def __init__(self, parent=None):

        super(Main_window, self).__init__(parent)
        self.window = Window()
        self.setCentralWidget(self.window)
        self.initUI()

    def initUI(self):

        menubar = self.menuBar()
        fileMenu = menubar.addMenu('File')

        impMenu = QMenu('Import', self)
        impAct = QAction('Import mail', self)
        impMenu.addAction(impAct)

        newAct = QAction('New', self)

        fileMenu.addAction(newAct)
        fileMenu.addMenu(impMenu)


app = QApplication.instance()
if app is None:
        app = QApplication([])
mw = Main_window()
mw.show()
mw.raise_()
QApplication.setOverrideCursor(QCursor(Qt.CrossCursor))
app.exec_()