我使用QPlainTextEdit并设置了一个视图setLayoutDirection(QtCore.Qt.RightToLeft)。的输出self.plaintxt.isRightToLeft()为 1，但在纯文本视图中，波斯文和英文文本从左侧显示。我的代码中发生了什么？
代码：
import sys, re
from PyQt5 import QtCore
from PyQt5.QtWidgets import QApplication, QLabel, QLineEdit, QMainWindow, QPushButton, QFileSystemModel, QTreeView, \
QFileDialog, QComboBox, QPlainTextEdit
from PyQt5.QtCore import pyqtSlot
class App(QMainWindow):
def __init__(self):
super(App, self).__init__()
self.title = 'by PyQt5 and python 3.7'
self.left = 10
self.top = 10
self.width = 1000
self.height = 500
self.initUI()
def initUI(self):
self.setWindowTitle(self.title)
self.setGeometry(self.left, self.top, self.width, self.height)
self.btn_browse = QPushButton('Browse', self)
self.btn_browse.move(50, 20)
self.btn_browse.clicked.connect(self.on_click)
self.textbox = QLineEdit(self)
self.textbox.move(170, 20)
self.textbox.resize(280, 40)
self.textbox.setAlignment(QtCore.Qt.AlignRight) # It is in right.
self.page_view = QPlainTextEdit(self)
self.page_view.move(20, 100)
self.page_view.resize(800, 400)
self.page_view.setLayoutDirection(QtCore.Qt.RightToLeft) # It is not in right.
self.show()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = App()
sys.exit(app.exec_())
