pyqt5 QTextDocument 打印字符格式怎么设置

Question

问题遇到的现象和发生背景

insertText() 方法怎么自定义插入不同格式的字符

问题相关代码，请勿粘贴截图

# -*- coding: utf-8 -*-

from PyQt5 import QtCore, QtGui, QtWidgets,QtPrintSupport
from PyQt5.QtGui import QFont,QTextDocument,QTextCursor
from PyQt5.QtPrintSupport import QPrinter, QPrintDialog,QPrintPreviewDialog


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        font = QtGui.QFont()
        font.setFamily("楷体")
        font.setPointSize(12)
        font.setBold(False)
        font.setWeight(50)
        MainWindow.setFont(font)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        # 布置一个按钮
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(20, 10, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.pushButton.setText('打印')
        self.pushButton.clicked.connect(self.on_printAction2_triggered)
        # 布置一个标签
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(20, 60, 571, 32))
        font = QtGui.QFont()
        font.setFamily("楷体")
        font.setPointSize(30)
        font.setBold(True)
        self.label.setFont(font)
        self.label.setLineWidth(1)
        self.label.setText("测试字体和大小和格式的标签")
        self.label.setObjectName("label")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 22))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)


    def handlePaintRequest(self,printer):   # 打印函数
        document = QTextDocument()
        cursor = QTextCursor(document)
        try:
            cursor.insertText('\n\n这段文字是默认的字体和大小等格式\n\n')
            cursor.insertText(self.label.text())
            cursor.insertText('\n\n这段文字的字体和大小要重新定义要怎么设置?')
            document.print(printer)
        except Exception as e:
            print(e)


    def on_printAction2_triggered(self):    # 槽函数
        dialog = QPrintPreviewDialog()
        dialog.paintRequested.connect(self.handlePaintRequest)
        dialog.exec_()


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "打印测试"))

# 程序入口
if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec())

运行结果及报错内容

我的解答思路和尝试过的方法

我想要达到的结果

Answer 1

控件字体样式等设置 有几种情况：

self.btnStep.setStyleSheet("QPushButton{font-family:'微软雅黑';font-size:16px;"
"color:#ADD8E6;background-color:#F0F0F0;text-align: left}")

self.textedit.setStyleSheet('background-color: rgb(33, 33, 33);'
'border-color: rgb(18, 18, 18);'
'color: rgb(255, 255, 255);'
'font: bold italic 20pt "Times New Roman";' )

self.lineEdit.setStyleSheet("color:red");//文本颜色
self.lineEdit.setStyleSheet("background-color:red");//背景色

self.textEdit.append("<font color="#0000FF">\n 1. 图像变换") # 显示蓝色