PyQT implements multi-window switching

This article mainly introduces the method of PyQT to implement multi-window switching in detail. It has certain reference value. Interested friends can refer to

I recently made a software and wrote it in PyQT. , I was seriously stuck when I realized that a new window would pop up when I clicked on the menu bar. I found that it was completely impossible to do it with WxPython's ideas and methods. There is really too little Chinese information on PyQT. After reading some English information and QT information, I deduced the implementation method of PyQT and finally got it. Below is a small demo.

The code of the main interface is as follows:

# -*- coding: utf-8 -*- 
 
from PyQt4 import QtCore, QtGui 
from dialog1 import Dialog1 
from dialog2 import Dialog2 
import sys 
 
try: 
  _fromUtf8 = QtCore.QString.fromUtf8 
except AttributeError: 
  def _fromUtf8(s): 
    return s 
 
try: 
  _encoding = QtGui.QApplication.UnicodeUTF8 
  def _translate(context, text, disambig): 
    return QtGui.QApplication.translate(context, text, disambig, _encoding) 
except AttributeError: 
  def _translate(context, text, disambig): 
    return QtGui.QApplication.translate(context, text, disambig) 
   
class MainWindow(QtGui.QWidget):  
   
  dialog1_signal = QtCore.pyqtSignal()     #定义一个无参数的信号，串口设定与子站初始化信号 
  dialog2_signal = QtCore.pyqtSignal()     #定义一个无参数的信号，串口设定与子站初始化信号 
  exit_signal = QtCore.pyqtSignal()     #定义一个无参数的信号，串口设定与子站初始化信号 
   
  def __init__(self): 
    super(MainWindow,self).__init__() 
     
  def setupUi(self, Form): 
    Form.setObjectName(_fromUtf8("Form")) 
    Form.resize(400, 300) 
    self.form = Form 
    self.pushButton = QtGui.QPushButton(Form) 
    self.pushButton.setGeometry(QtCore.QRect(70, 90, 75, 23)) 
    self.pushButton.setObjectName(_fromUtf8("pushButton")) 
    self.pushButton_2 = QtGui.QPushButton(Form) 
    self.pushButton_2.setGeometry(QtCore.QRect(240, 90, 75, 23)) 
    self.pushButton_2.setObjectName(_fromUtf8("pushButton_2")) 
    self.pushButton_3 = QtGui.QPushButton(Form) 
    self.pushButton_3.setGeometry(QtCore.QRect(150, 160, 75, 23)) 
    self.pushButton_3.setObjectName(_fromUtf8("pushButton_3")) 
    self.label = QtGui.QLabel(Form) 
    self.label.setGeometry(QtCore.QRect(170, 40, 54, 16)) 
    self.label.setObjectName(_fromUtf8("label")) 
 
    self.retranslateUi(Form) 
    QtCore.QMetaObject.connectSlotsByName(Form) 
 
    #信号连接到指定槽 
    self.pushButton.clicked.connect(self.on_pushButton_clicked) 
    self.pushButton_2.clicked.connect(self.on_pushButton_2_clicked) 
    self.pushButton_3.clicked.connect(self.on_pushButton_3_clicked) 
     
     
  def retranslateUi(self, Form): 
    Form.setWindowTitle(_translate("Form", "Form", None)) 
    self.pushButton.setText(_translate("Form", "进入dialog1", None)) 
    self.pushButton_2.setText(_translate("Form", "进入dialog2", None)) 
    self.pushButton_3.setText(_translate("Form", "退出", None)) 
    self.label.setText(_translate("Form", "主窗体", None)) 
     
  def on_pushButton_clicked(self): 
    self.form.hide() 
    Form1 = QtGui.QDialog() 
    ui = Dialog1() 
    ui.setupUi(Form1) 
    Form1.show() 
    Form1.exec_() 
    self.form.show() 
 
  def on_pushButton_3_clicked(self, Form): 
    #QtCore.QObject.connect( self.pushButton_3, QtCore.SIGNAL("clicked()"), self, QtCore.SLOT(quit())) 
    #也可以这样 
    self.form.close() 
     
  def on_pushButton_2_clicked(self): 
    self.form.close() 
    Form1 = QtGui.QDialog() 
    ui = Dialog2() 
    ui.setupUi(Form1) 
    Form1.show() 
    Form1.exec_() 
    self.form.show() 
 
if __name__ == '__main__': 
  app = QtGui.QApplication(sys.argv) 
  Form = QtGui.QWidget() 
  window = MainWindow()  
  window.setupUi(Form) 
  Form.show()   
  sys.exit(app.exec_())  
   
  pass

Dialog1 interface The code is as follows:

# -*- coding: utf-8 -*- 
 
from PyQt4 import QtCore, QtGui 
 
 
try: 
  _fromUtf8 = QtCore.QString.fromUtf8 
except AttributeError: 
  def _fromUtf8(s): 
    return s 
 
try: 
  _encoding = QtGui.QApplication.UnicodeUTF8 
  def _translate(context, text, disambig): 
    return QtGui.QApplication.translate(context, text, disambig, _encoding) 
except AttributeError: 
  def _translate(context, text, disambig): 
    return QtGui.QApplication.translate(context, text, disambig) 
  
class Dialog1(QtGui.QWidget): 
  def setupUi(self, Dialog): 
    Dialog.setObjectName(_fromUtf8("Dialog")) 
    Dialog.resize(400, 300) 
    self.form = Dialog 
    self.label = QtGui.QLabel(Dialog) 
    self.label.setGeometry(QtCore.QRect(180, 50, 54, 12)) 
    self.label.setObjectName(_fromUtf8("label")) 
    self.dialog1_pushButton = QtGui.QPushButton(Dialog) 
    self.dialog1_pushButton.setGeometry(QtCore.QRect(160, 130, 75, 23)) 
    self.dialog1_pushButton.setObjectName(_fromUtf8("pushButton")) 
 
    self.retranslateUi(Dialog) 
    QtCore.QMetaObject.connectSlotsByName(Dialog) 
 
    #信号连接到指定槽 
    self.dialog1_pushButton.clicked.connect(self.on_dialog1_pushButton_clicked) 
     
  def retranslateUi(self, Dialog): 
    Dialog.setWindowTitle(_translate("Dialog", "Dialog", None)) 
    self.label.setText(_translate("Dialog", "dialog1", None)) 
    self.dialog1_pushButton.setText(_translate("Dialog", "返回主窗体", None)) 
 
  def on_dialog1_pushButton_clicked(self): 
    self.form.close() 
 
if __name__ == "__main__": 
  import sys 
  app = QtGui.QApplication(sys.argv) 
  Dialog = QtGui.QDialog() 
  ui = Dialog1() 
  ui.setupUi(Dialog) 
  Dialog.show() 
  sys.exit(app.exec_()) 
   

Dialog2界面的代码如下：
[python] view plain copy
# -*- coding: utf-8 -*- 
 
from PyQt4 import QtCore, QtGui 
 
 
try: 
  _fromUtf8 = QtCore.QString.fromUtf8 
except AttributeError: 
  def _fromUtf8(s): 
    return s 
 
try: 
  _encoding = QtGui.QApplication.UnicodeUTF8 
  def _translate(context, text, disambig): 
    return QtGui.QApplication.translate(context, text, disambig, _encoding) 
except AttributeError: 
  def _translate(context, text, disambig): 
    return QtGui.QApplication.translate(context, text, disambig) 
  
class Dialog2(object): 
  def setupUi(self, Dialog): 
    Dialog.setObjectName(_fromUtf8("Dialog")) 
    Dialog.resize(400, 300) 
    self.form = Dialog 
    self.label = QtGui.QLabel(Dialog) 
    self.label.setGeometry(QtCore.QRect(180, 60, 54, 12)) 
    self.label.setObjectName(_fromUtf8("label")) 
    self.pushButton = QtGui.QPushButton(Dialog) 
    self.pushButton.setGeometry(QtCore.QRect(160, 140, 75, 23)) 
    self.pushButton.setObjectName(_fromUtf8("pushButton")) 
 
    self.retranslateUi(Dialog) 
    QtCore.QMetaObject.connectSlotsByName(Dialog) 
     
    #信号连接到指定槽 
    self.pushButton.clicked.connect(self.on_pushButton_clicked) 
     
  def retranslateUi(self, Dialog): 
    Dialog.setWindowTitle(_translate("Dialog", "Dialog", None)) 
    self.label.setText(_translate("Dialog", "dialog2", None)) 
    self.pushButton.setText(_translate("Dialog", "返回主窗体", None)) 
     
  def on_pushButton_clicked(self): 
    self.form .close() 
 
if __name__ == "__main__": 
  import sys 
  app = QtGui.QApplication(sys.argv) 
  Dialog = QtGui.QDialog() 
  ui = Dialog2() 
  ui.setupUi(Dialog) 
  Dialog.show() 
  sys.exit(app.exec_())

The button is bound to the processing function of the new pop-up interface, and the slot connection method used is:

self.pushButton.clicked.connect(self.on_pushButton_clicked)

If the Menu item is bound to the handler function of the new pop-up interface, the slot should be used The connection method is:

QtCore.QObject.connect(self.set_value_menu, QtCore.SIGNAL(_fromUtf8("triggered()")), self.open_set_value_form)

The slot processing functions used by the two are basically the same.
If the original interface is not displayed, just hide() the original interface, such as:

self.form.hide()

If you need to When a new window pops up while the original window remains visible, this step is not required. And in this case, if you want the original window to be selected as the top-level form, you should use show() when displaying the new window:

Form1.show()

If the new window is a fixed top-level form and the original form is covered, exec_() should be used:

Form1.exec_()

Related recommendations:

PyQt implements interface flip switching effect

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