直到QtWidgets.QMainWindow关闭，然后才继续

Question

我有一个PyQt5窗口，它将打开我创建的对话框窗口，该窗口要求用户做一些事情，然后单击一个关闭窗口的按钮。这两个窗口是用class RenameDialog(QtWidgets.QMainWindow):和class Prog(QtWidgets.QMainWindow):制作的。在Prog，我有self.renameDialog = RenameDialog(self)。在我的代码中

self.renameDialog.show()
#Other code to run after renameDialog window is closed

但这是行不通的，因为我不知道如何等到renameDialog关闭。我尝试过将self.renameDialog.setWindowModality(QtCore.Qt.WindowModality)放在self.renameDialog.show()之前，我试图弄清楚如何使用.exec_()，但不知道在这个上下文中可以在哪里使用这个方法。在继续代码之前，是否有一种方法可以等到隐藏或销毁这个QtWidgets.QMainWindow？

Answer 1

这里有两种可能性。

1.可以将对话框设置为模态。在这种情况下，与GUI的任何其他交互都会被阻止，直到用户关闭对话框为止。只有这样，代码才会继续。您需要从QDialog继承才能工作：

class RenameDialog(QDialog):
    # ...
    pass

class YourMainWindow(QMainWindow):
    def show_dlg(self):
        dlg = RenameDialog(self)
        res = dlg.exec()
        if res == QDialog.Accepted:
            print('Accepted')
        else:
            print('Rejected')

1. 连接到对话框的完成()信号。这样，对话框就不必是模态的，您仍然可以与GUI的其余部分进行交互。当用户关闭对话框时，将触发finished信号，并调用连接的回调函数。

Answer 2

在这里，我留下一个小的测试应用程序来测试QMainWindow充当QDialog的不同选项。

我是根据这个问题提出的：

PyQt:等待小部件关闭

这个问题的答案给了我@musicamante：

QMainWindow停止/暂停执行，直到窗口关闭(不是QDialog)

这是我的代码：

import sys
from PyQt6 import QtCore, QtWidgets

class Ui_FirstWindow(object):
    def setupUi(self, FirstWindow):
        FirstWindow.resize(400, 300)
        self.centralWidget = QtWidgets.QWidget(FirstWindow)
        self.pushButton = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton.setGeometry(QtCore.QRect(110, 130, 191, 23))
        self.pushButton.setText("Load Second Window")
        self.pushButton2 = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton2.setGeometry(QtCore.QRect(110, 170, 191, 23))
        self.pushButton2.setText("LoadThirdWindow")
        self.pushButton4 = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton4.setGeometry(QtCore.QRect(110, 210, 191, 23))
        self.pushButton4.setText("4 Window")
        self.pushButton5 = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton5.setGeometry(QtCore.QRect(110, 250, 191, 23))
        self.pushButton5.setText("5 Window")
        FirstWindow.setCentralWidget(self.centralWidget)
        

    def LoadSecondWindow(self):
        SecondWindow = QtWidgets.QMainWindow()
        ui = Ui_SecondWindow()
        ui.setupUi(SecondWindow)
        SecondWindow.show()
        
class Ui_SecondWindow(object):
    
    def setupUi(self, SecondWindow):
        SecondWindow.resize(400, 300)
        self.centralWidget = QtWidgets.QWidget(SecondWindow)
        self.pushButton = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton.setGeometry(QtCore.QRect(110, 130, 191, 23))
        SecondWindow.setCentralWidget(self.centralWidget)
        self.pushButton.setText('PushButton')
        
class Controller:

    def __init__(self):
        pass

    def Show_FirstWindow(self):

        self.FirstWindow = QtWidgets.QMainWindow()
        self.ui = Ui_FirstWindow()
        self.ui.setupUi(self.FirstWindow)
        self.ui.pushButton.clicked.connect(self.Show_SecondWindow)
        self.ui.pushButton2.clicked.connect(self.Show_ThirdWindow)
        self.ui.pushButton4.clicked.connect(self.Show_4Window)
        self.ui.pushButton5.clicked.connect(self.Show_5Window)
        
        self.FirstWindow.show()

    def Show_SecondWindow(self):
        
        self.SecondWindow = QtWidgets.QMainWindow()
        
        self.ui = Ui_SecondWindow()
        self.ui.setupUi(self.SecondWindow)
       
        self.SecondWindow.setWindowModality(QtCore.Qt.WindowModality.ApplicationModal)
        self.SecondWindow.show()
        print("Don't Stop")
        
    def Show_ThirdWindow(self):
        self.ThirdWindow = QtWidgets.QDialog()
        self.ThirdWindow.exec()
        print('Yess Stop Window 3')

    def Show_4Window(self):
        # https://stackoverflow.com/questions/19462112/pyqt-wait-until-widget-closes
        self.widget = QtWidgets.QMainWindow()
        self.widget.setAttribute(QtCore.Qt.WidgetAttribute.WA_DeleteOnClose)
        self.widget.setWindowModality(QtCore.Qt.WindowModality.ApplicationModal)
        self.widget.show()
        loop = QtCore.QEventLoop()
        self.widget.destroyed.connect(loop.quit)
        loop.exec() # wait ...
        print('Yes Stop Window 4')
    
    def Show_5Window(self):
        def action5(self):
            print('Yes Stop Window 5')
            
        self.window5 = QtWidgets.QMainWindow()
        
        self.ui = Ui_SecondWindow()
        self.ui.setupUi(self.window5)
        self.window5.setAttribute(QtCore.Qt.WidgetAttribute.WA_DeleteOnClose)
        self.window5.setWindowModality(QtCore.Qt.WindowModality.ApplicationModal)
        self.window5.show()
        self.window5.destroyed.connect(action5)
        

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    Controller = Controller()
    Controller.Show_FirstWindow()
    sys.exit(app.exec())