PyQt5 switch between windows

问题:

I want to create menu based on tiles. Now I need PyQt5 concept how to switch MainWindow to Window1/Window2/... with back option to MainWindow. The only thing I've achieved is opening a new window on top. I'd rather have separate windows, where I could define different functions.

from PyQt5 import QtGui
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
from PyQt5.QtCore import pyqtSlot
import sys

class Window(QMainWindow):
    def __init__(self):
        super().__init__()
        self.title = "App"
        self.top = 100
        self.left = 100
        self.width = 680
        self.height = 500
        self.InitUI()

    def InitUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.top, self.left, self.width, self.height)

        buttonWindow1 = QPushButton('Window1', self)
        buttonWindow1.move(100, 100)
        buttonWindow1.clicked.connect(self.buttonWindow1_onClick)

        buttonWindow2 = QPushButton('Window2', self)
        buttonWindow2.move(100, 200)
        buttonWindow2.clicked.connect(self.buttonWindow2_onClick)

        self.show()

    @pyqtSlot()
    def buttonWindow1_onClick(self):
        self.statusBar().showMessage("Switched to window 1")

    @pyqtSlot()
    def buttonWindow2_onClick(self):
        self.statusBar().showMessage("Switched to window 2")

if __name__ == '__main__':
    app=QApplication(sys.argv)
    ex=Window()
    sys.exit(app.exec_())

回答1:

Try it:

import sys
from PyQt5.QtGui     import *
from PyQt5.QtCore    import *
from PyQt5.QtWidgets import *

class Window(QMainWindow):
    def __init__(self):
        super().__init__()
        self.title = "App"
        self.top = 100
        self.left = 100
        self.width = 680
        self.height = 500
        self.InitUI()

    def InitUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.top, self.left, self.width, self.height)

        buttonWindow1 = QPushButton('Window1', self)
        buttonWindow1.move(100, 100)
        buttonWindow1.clicked.connect(self.buttonWindow1_onClick)
        self.lineEdit1 = QLineEdit("Type here what you want to transfer for [Window1].", self)
        self.lineEdit1.setGeometry(250, 100, 400, 30)

        buttonWindow2 = QPushButton('Window2', self)
        buttonWindow2.move(100, 200)
        buttonWindow2.clicked.connect(self.buttonWindow2_onClick)        
        self.lineEdit2 = QLineEdit("Type here what you want to transfer for [Window2].", self)
        self.lineEdit2.setGeometry(250, 200, 400, 30)
        self.show()

    @pyqtSlot()
    def buttonWindow1_onClick(self):
        self.statusBar().showMessage("Switched to window 1")
        self.cams = Window1(self.lineEdit1.text()) 
        self.cams.show()
        self.close()

    @pyqtSlot()
    def buttonWindow2_onClick(self):
        self.statusBar().showMessage("Switched to window 2")
        self.cams = Window2(self.lineEdit2.text()) 
        self.cams.show()
        self.close()


class Window1(QDialog):
    def __init__(self, value, parent=None):
        super().__init__(parent)
        self.setWindowTitle('Window1')
        self.setWindowIcon(self.style().standardIcon(QStyle.SP_FileDialogInfoView))

        label1 = QLabel(value)
        self.button = QPushButton()
        self.button.setSizePolicy(QSizePolicy.Minimum, QSizePolicy.Expanding)
        self.button.setIcon(self.style().standardIcon(QStyle.SP_ArrowLeft))
        self.button.setIconSize(QSize(200, 200))

        layoutV = QVBoxLayout()
        self.pushButton = QPushButton(self)
        self.pushButton.setStyleSheet('background-color: rgb(0,0,255); color: #fff')
        self.pushButton.setText('Click me!')
        self.pushButton.clicked.connect(self.goMainWindow)
        layoutV.addWidget(self.pushButton)

        layoutH = QHBoxLayout()
        layoutH.addWidget(label1)
        layoutH.addWidget(self.button)
        layoutV.addLayout(layoutH)
        self.setLayout(layoutV)

    def goMainWindow(self):
        self.cams = Window()
        self.cams.show()
        self.close() 


class Window2(QDialog):
    def __init__(self, value, parent=None):
        super().__init__(parent)
        self.setWindowTitle('Window2')
        self.setWindowIcon(self.style().standardIcon(QStyle.SP_FileDialogInfoView))

        label1 = QLabel(value)
        self.button = QPushButton()
        self.button.setSizePolicy(QSizePolicy.Minimum, QSizePolicy.Expanding)
        self.button.setIcon(self.style().standardIcon(QStyle.SP_ArrowLeft))
        self.button.setIconSize(QSize(200, 200))

        layoutV = QVBoxLayout()
        self.pushButton = QPushButton(self)
        self.pushButton.setStyleSheet('background-color: rgb(0,0,255); color: #fff')
        self.pushButton.setText('Click me!')
        self.pushButton.clicked.connect(self.goMainWindow)
        layoutV.addWidget(self.pushButton)

        layoutH = QHBoxLayout()
        layoutH.addWidget(label1)
        layoutH.addWidget(self.button)
        layoutV.addLayout(layoutH)
        self.setLayout(layoutV)

    def goMainWindow(self):
        self.cams = Window()
        self.cams.show()
        self.close()    


if __name__ == '__main__':
    app=QApplication(sys.argv)
    ex=Window()
    sys.exit(app.exec_())

回答2:

Try this:

from file2 import Ui_Dialog2 #------>import the class for next window
def buttonWindow1_onClick(self):
    self.window=QtWidgets.QMainWindow()
    self.ui=Ui_Dialog2()      #------------->creating an object 
    self.ui.setupUi(self.window)
    self.window.show()

Here the Ui_Dialog2() represents that your are creating an object for new window (in your case creating object for Window1 for switch MainWindow to Window1 ).So when you click the next button this function is called so an object is created for the next window and the window will be opened.