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我正在尝试使用QtPainter预览我的整个QMainWindow（所有内容），以便我可以从预览菜单中打印它。我所有的尝试都失败了。下面是示例代码。

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5 import *
from PyQt5 import uic, QtPrintSupport
from PyQt5.QtPrintSupport import QPrintDialog, QPrinter
from PyQt5 import QtCore, QtWidgets, QtPrintSupport, QtGui
import sys, os
class mainwindowUI(QMainWindow):
    resized = QtCore.pyqtSignal()
    def __init__(self, parent = None):
        super(mainwindowUI, self).__init__(parent)
        self.text = QLineEdit('Hello World', self)
        self.print_()
        self.show()
    def print_(self):
        dialog = QtPrintSupport.QPrintPreviewDialog() # PyQt5
        # dialog = QPrintPreviewDialog()
        dialog.paintRequested.connect(self.handlePaintRequest)
        dialog.exec_()

    def handlePaintRequest(self, printer):
        painter = QtGui.QPainter()
        # Start painter
        painter.begin(printer)
        # Grab a widget you want to print
        screen = self.grab()
        # Draw grabbed pixmap
        painter.drawPixmap(10, 10, screen)
        # End painting
        painter.end()
        self.graphicsView = QGraphicsView(painter)
        self.graphicsView.render(QPainter(printer))
        self.viewer.render(QPainter(printer))

    def handlePrint(self):
        dialog = QtPrintSupport.QPrintDialog()
        if dialog.exec_() == QDialog.Accepted:
            self.editor.document().print_(dialog.printer())
if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = mainwindowUI()
    sys.exit(app.exec_())

我想要什么，QtPainter预览窗口显示我的QMainWindow和里面的一切。它似乎QtPainter需要一个QGraphicsView所以我的主窗口必须以某种方式转换为那个......（我.ui在我的最终项目中使用我在 QtCreator 中设计的一个文件，以防万一这让一些事情变得更加困难）

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