Python 如何检测对话框'；什么是最后一件事？

大家好

我正在使用python3.4和Windows7中的PyQt5制作一个GUI应用程序

应用程序非常简单。用户单击主窗口的按钮，弹出信息对话框。当用户单击信息对话框的关闭按钮（窗口的X按钮）时，系统显示确认消息。就这些

这是我的密码

# coding: utf-8

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, QDialog, QLabel

class mainClass(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        openDlgBtn = QPushButton("openDlg", self)
        openDlgBtn.clicked.connect(self.openChildDialog)
        openDlgBtn.move(50, 50)

        self.setGeometry(100, 100, 200, 200)
        self.show()

    def openChildDialog(self):
        childDlg = QDialog(self)
        childDlgLabel = QLabel("Child dialog", childDlg)

        childDlg.resize(100, 100)
        childDlg.show()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    mc = mainClass()
    sys.exit(app.exec_())

结果屏幕截图是

在这种情况下，我在mainClass中添加了这些代码

def closeEvent(self, event):
    print("X is clicked")

此代码仅在主窗口关闭时有效。但我想要的是当childDlg关闭时closeEvent函数工作。不是主窗口

---

我该怎么办？

您已经在类

mainClass

中添加了方法

closeEvent

。 因此，您重新实现了

QMainwindow

的

closeEvent

方法，而不是

ChildLg的
closeEvent
方法。为此，您必须将
chilDlg
子类化如下：

# coding: utf-8

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, QDialog, QLabel

class ChildDlg(QDialog):
   def closeEvent(self, event):
      print("X is clicked")

class mainClass(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        openDlgBtn = QPushButton("openDlg", self)
        openDlgBtn.clicked.connect(self.openChildDialog)
        openDlgBtn.move(50, 50)

        self.setGeometry(100, 100, 200, 200)
        self.show()

    def openChildDialog(self):
        childDlg = ChildDlg(self)
        childDlgLabel = QLabel("Child dialog", childDlg)

        childDlg.resize(100, 100)
        childDlg.show()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    mc = mainClass()
    sys.exit(app.exec_())

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, QDialog, QLabel

class mainClass(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        openDlgBtn = QPushButton("openDlg", self)
        openDlgBtn.clicked.connect(self.openChildDialog)
        openDlgBtn.move(50, 50)

        self.setGeometry(100, 100, 200, 200)
        self.show()

    def openChildDialog(self):
        childDlg = QDialog(self)
        childDlgLabel = QLabel("Child dialog", childDlg)

        childDlg.closeEvent = self.CloseEvent

        childDlg.resize(100, 100)
        childDlg.show()

    def CloseEvent(self, event):
        print("X is clicked")

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mc = mainClass()
    sys.exit(app.exec_())