PyQt5从子窗口关闭父窗口和子窗口

Posted 2023-03-30

【中文标题】PyQt5从子窗口关闭父窗口和子窗口

【英文标题】：PyQt5 close Parent window & child window from child window

【发布时间】：2020-08-11 15:14:25

【问题描述】：

我已经使用设计器制作了一个 pyqt5 GUI 并转换为 python 代码。 我希望第一个窗口打开另一个窗口，依此类推。

win1->win2->win3

现在我在 win3 中有一个按钮，单击该按钮时必须关闭窗口[win1, win2,win3(itself)] 并且必须再次重新启动win1。

我尝试定义从win1打开win2和从win 2打开win3 两者都没有引发错误，虽然对我没有用

如何做到这一点？请帮帮我。

Win1

from PyQt5 import QtCore, QtGui, QtWidgets
from win_2 import *

class Ui_Win1(object):

def setupUi(self, Win1):
    Win1.setObjectName("Win1")
    Win1.resize(640, 480)
    Win1.setStyleSheet("*background:black;")
    self.centralwidget = QtWidgets.QWidget(Win1)
    self.centralwidget.setObjectName("centralwidget")
    self.frame = QtWidgets.QFrame(self.centralwidget)
    self.frame.setGeometry(QtCore.QRect(110, 70, 361, 301))
    self.frame.setStyleSheet("border: 2px solid white ;\n")
    self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
    self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
    self.frame.setObjectName("frame")
    self.pushbutton1 = QtWidgets.QPushButton(self.frame)
    self.pushbutton1.setGeometry(QtCore.QRect(120, 120, 131, 41))
    self.pushbutton1.setStyleSheet("background:white;")
    self.pushbutton1.setObjectName("pushbutton1")
    Win1.setCentralWidget(self.centralwidget)

    self.retranslateUi(Win1)
    QtCore.QMetaObject.connectSlotsByName(Win1)

    self.pushbutton1.clicked.connect(lambda: self.openwin2())  # calling function

def retranslateUi(self, Win1):
    _translate = QtCore.QCoreApplication.translate
    Win1.setWindowTitle(_translate("Win1", "MainWindow"))
    self.pushbutton1.setText(_translate("Win1", "Go to Win 2"))


def openwin2(self):                   #Function for opening win2
    Win2 = QtWidgets.QMainWindow()
    ui = Ui_Win2()
    ui.setupUi(Win2)
    Win2.show()

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Win1 = QtWidgets.QMainWindow()
    ui = Ui_Win1()
    ui.setupUi(Win1)
    Win1.show()
    sys.exit(app.exec_())

Win2

from PyQt5 import QtCore, QtGui, QtWidgets
from win_3 import *

class Ui_Win2(object):
    def setupUi(self, Win2):
        Win2.setObjectName("Win2")
        Win2.resize(640, 480)
        Win2.setStyleSheet("*background:black;")
        self.centralwidget = QtWidgets.QWidget(Win2)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(10, 20, 361, 301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton2 = QtWidgets.QPushButton(self.frame)
        self.pushbutton2.setGeometry(QtCore.QRect(120, 120, 131, 41))
        self.pushbutton2.setStyleSheet("background:white;")
        self.pushbutton2.setObjectName("pushbutton2")
        Win2.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win2)
        QtCore.QMetaObject.connectSlotsByName(Win2)

        self.pushbutton2.clicked.connect(self.openwin3)  # calling function

    def retranslateUi(self, Win2):
        _translate = QtCore.QCoreApplication.translate
        Win2.setWindowTitle(_translate("Win2", "MainWindow"))
        self.pushbutton2.setText(_translate("Win2", "Go to Win 3"))

    def openwin3(self):                   #Function for opening win3
        Win3 = QtWidgets.QMainWindow()
        ui = Ui_Win3()
        ui.setupUi(Win3)
        Win3.show()

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Win2 = QtWidgets.QMainWindow()
    ui = Ui_Win2()
    ui.setupUi(Win2)
    Win2.show()
    sys.exit(app.exec_())

Win3

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Win3(object):
    def setupUi(self, Win3):
        Win3.setObjectName("Win3")
        Win3.resize(640, 480)
        Win3.setStyleSheet("*background:black;")
        self.centralwidget = QtWidgets.QWidget(Win3)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(250, 140, 361, 301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton3 = QtWidgets.QPushButton(self.frame)
        self.pushbutton3.setGeometry(QtCore.QRect(120, 130, 131, 41))
        self.pushbutton3.setStyleSheet("background:white;")
        self.pushbutton3.setObjectName("pushbutton3")
        Win3.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win3)
        QtCore.QMetaObject.connectSlotsByName(Win3)

    def retranslateUi(self, Win3):
        _translate = QtCore.QCoreApplication.translate
        Win3.setWindowTitle(_translate("Win3", "MainWindow"))
        self.pushbutton3.setText(_translate("Win3", "Close and Relaunch"))

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Win3 = QtWidgets.QMainWindow()
    ui = Ui_Win3()
    ui.setupUi(Win3)
    Win3.show()
    sys.exit(app.exec_())

【问题讨论】：

请提供minimal reproducible example

我添加了可重现的示例

【参考方案1】：

不要修改 Qt Designer 生成的代码，而是创建另一个继承的类 来自适当的小部件并使用初始类来填充它。

win_1.py

from PyQt5 import QtCore, QtGui, QtWidgets
from win_2 import Ui_Win2                                              # +++
from win_3 import Ui_Win3                                              # +++


class Ui_Win1(object):
    def setupUi(self, Win1):
        Win1.setObjectName("Win1")
        Win1.resize(640, 480)
        Win1.setStyleSheet("*background:black;")
        self.centralwidget = QtWidgets.QWidget(Win1)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(110, 70, 361, 301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton1 = QtWidgets.QPushButton(self.frame)
        self.pushbutton1.setGeometry(QtCore.QRect(120, 120, 131, 41))
        self.pushbutton1.setStyleSheet("background:white;")
        self.pushbutton1.setObjectName("pushbutton1")
        Win1.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win1)
        QtCore.QMetaObject.connectSlotsByName(Win1)

    def retranslateUi(self, Win1):
        _translate = QtCore.QCoreApplication.translate
        Win1.setWindowTitle(_translate("Win1", "MainWindow"))
        self.pushbutton1.setText(_translate("Win1", "Go to Win 2"))


class Win3(QtWidgets.QMainWindow, Ui_Win3):
    def __init__(self, parent=None):
        super(Win3, self).__init__(parent)
        self.parent = parent
        self.setupUi(self)
        self.setWindowTitle("Win3")
        self.pushbutton3.clicked.connect(self.openwin1)
        
    def openwin1(self):                           # +++ Function for opening win1
        self.parent.show()
        self.hide()        
        

class Win2(QtWidgets.QMainWindow, Ui_Win2):
    def __init__(self, parent=None):
        super(Win2, self).__init__(parent)
        self.parent = parent
        self.setupUi(self)
        self.setWindowTitle("Win2")
        self.pushbutton2.clicked.connect(self.openwin3)  # calling function
        
    def openwin3(self):                          # Function for opening win3
        self.win3 = Win3(self.parent)
        self.win3.show()        
        self.hide()
        

class Win1(QtWidgets.QMainWindow, Ui_Win1):
    def __init__(self):
        super().__init__()
        
        self.setupUi(self)
        self.setWindowTitle("Win1")
        self.pushbutton1.clicked.connect(self.openwin2)  # +++ calling function

    def openwin2(self):                   # Function for opening win2
        self.win2 = Win2(self)
        self.win2.show()
        self.hide()
        

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    win1 = Win1()
    win1.show()
    sys.exit(app.exec_())

win_2.py

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Win2(object):
    def setupUi(self, Win2):
        Win2.setObjectName("Win2")
        Win2.resize(640, 480)
        Win2.setStyleSheet("*background:black;")
        self.centralwidget = QtWidgets.QWidget(Win2)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(10, 20, 361, 301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton2 = QtWidgets.QPushButton(self.frame)
        self.pushbutton2.setGeometry(QtCore.QRect(120, 120, 131, 41))
        self.pushbutton2.setStyleSheet("background:white;")
        self.pushbutton2.setObjectName("pushbutton2")
        Win2.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win2)
        QtCore.QMetaObject.connectSlotsByName(Win2)

    def retranslateUi(self, Win2):
        _translate = QtCore.QCoreApplication.translate
        Win2.setWindowTitle(_translate("Win2", "MainWindow"))
        self.pushbutton2.setText(_translate("Win2", "Go to Win 3"))

win_3.py

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Win3(object):
    def setupUi(self, Win3):
        Win3.setObjectName("Win3")
        Win3.resize(640, 480)
        Win3.setStyleSheet("*background:black;")
        self.centralwidget = QtWidgets.QWidget(Win3)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(250, 140, 361, 301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton3 = QtWidgets.QPushButton(self.frame)
        self.pushbutton3.setGeometry(QtCore.QRect(120, 130, 131, 41))
        self.pushbutton3.setStyleSheet("background:white;")
        self.pushbutton3.setObjectName("pushbutton3")
        Win3.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win3)
        QtCore.QMetaObject.connectSlotsByName(Win3)

    def retranslateUi(self, Win3):
        _translate = QtCore.QCoreApplication.translate
        Win3.setWindowTitle(_translate("Win3", "MainWindow"))
        self.pushbutton3.setText(_translate("Win3", "Close and Relaunch"))