class Texts(QtGui.QMainWindow,Ui_MainWindow):

def __init__(self,parne=None):

super(Texts,self).__init__(parne)

self.setupUi(self)

self.setWindowTitle(u'文档或者其他')

self.setWindowIcon((QtGui.QIcon(r'i/e.jpg')))

self.setFixedSize(500,550)

self.action_3_clear.setEnabled(False)

self.showtext.setEnabled(False)

self.adjustSize()

import random

rand1='#FFFFFF'

rand2='#000099'

self.showtext.setStyleSheet(""

"color: %s;"

"margin: 10px;"

"padding: 5px;"

"padding-left: 15px;"

"padding-right: 15px;"

"border-radius: 5px;"

"border: 3px solid #abc;"%(rand1,rand2))

self.showtext.setReadOnly(True)

self.showtext.setEnabled(True)

self.setWindowIcon(QtGui.QIcon(r'i/e.png'))

self.action_3_about.triggered.connect(self.aboutn)

self.action_close.triggered.connect(self.close_)

self.action_file.triggered.connect(self.openflies)

self.action_3_clear.triggered.connect(self.qingkong_)

self.showtext.textChanged.connect(self.updatea)

def aboutn(self):

QtGui.QMessageBox.information(self,u'关于',u'这部分是文档或者文本部分，用于查看有关内容的地方')

def close_(self):

self.close()

def openflies(self):

self.showtext.setEnabled(True)

fileName=QtGui.QFileDialog.getOpenFileName(self)

if fileName.isEmpty()==False:

if self.showtext.document().isEmpty():

self.loadFile(fileName)

def loadFile(self,fileName):

file=QtCore.QFile(fileName)

if file.open(QtCore.QIODevice.ReadOnly|QtCore.QIODevice.Text):

textStream=QtCore.QTextStream(file)

while textStream.atEnd()==False:

self.showtext.appendPlainText(textStream.readLine())

def qingkong_(self):

close1=QtGui.QMessageBox(self)

close1.setWindowTitle(u'清空选项')

close1.setWindowIcon(QtGui.QIcon(r'i/a.png'))

yes=close1.addButton(u'清空(&Yes)',QtGui.QMessageBox.ActionRole)

no=close1.addButton(u'否(&No)',QtGui.QMessageBox.ActionRole)

close1.setText(u'您真的要退出这个工具吗?')

close1.exec_()

button=close1.clickedButton()

if button==yes:

self.showtext.clear()

else:pass

def updatea(self):

self.action_3_clear.setEnabled(self.showtext.toPlainText().isEmpty()==False)

self.showtext.setEnabled(True)

如图: