from PyQt5 import QtWidgets 
from MainForm import Ui_MainForm 
from Children import Ui_Form 
 
from PyQt5.QtWidgets import QFileDialog 
 
class MainForm(QtWidgets.QMainWindow,Ui_MainForm): 
  def __init__(self): 
    super(MainForm,self).__init__() 
    self.setupUi(self) 
 
    self.child=ChildrenForm()             #self.child = children()生成子窗口实例self.child 
 
 
    self.fileOpen.triggered.connect(self.openMsg)   #菜单的点击事件是triggered 
    self.fileClose.triggered.connect(self.close) 
    self.actionTst.triggered.connect(self.childShow)  #点击actionTst,子窗口就会显示在主窗口的MaingridLayout中 
 
  def childShow(self): 
    self.MaingridLayout.addWidget(self.child)     #添加子窗口 
    self.child.show() 
 
 
  def openMsg(self): 
    file,ok=QFileDialog.getOpenFileName(self,"打开","C:/","All Files (*);;Text Files (*.txt)") 
    self.statusbar.showMessage(file)          #在状态栏显示文件地址 
 
class ChildrenForm(QtWidgets.QWidget,Ui_Form): 
  def __init__(self): 
    super(ChildrenForm,self).__init__() 
    self.setupUi(self) 
 
if __name__=="__main__": 
  import sys 
 
  app=QtWidgets.QApplication(sys.argv) 
  myshow=MainForm() 
  myshow.show() 
  sys.exit(app.exec_())