PyQt 的 QMainWindow closeEvent 永远不会被调用

Question

我在 python 中使用 pyqt4。
当我关闭 QMainWindow 窗口时，它不是由closeEvent 方法处理的。 请有人告诉我这段代码有什么问题：

from PyQt4 import QtCore, QtGui
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(277, 244)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
    def closeEvent(self,event):
        result = QtGui.QMessageBox.question(self,
                      "Confirm Exit...",
                      "Are you sure you want to exit ?",
                      QtGui.QMessageBox.Yes| QtGui.QMessageBox.No)
        event.ignore()

        if result == QtGui.QMessageBox.Yes:
         event.accept()
if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    ui = Ui_MainWindow()

Answer 1

closeEvent 是QMainwindow 的一个方法，但您正试图从自己的Ui_MainWindow 类中使用它。试试这个：

from PyQt4 import QtCore, QtGui


class MainWindow(QtGui.QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.setupUi()

    def setupUi(self):
        self.setObjectName("MainWindow")
        self.resize(277, 244)
        self.statusbar = QtGui.QStatusBar()
        self.statusbar.setObjectName("statusbar")
        self.setStatusBar(self.statusbar)

    def closeEvent(self,event):
        result = QtGui.QMessageBox.question(self,
                      "Confirm Exit...",
                      "Are you sure you want to exit ?",
                      QtGui.QMessageBox.Yes| QtGui.QMessageBox.No)
        event.ignore()

        if result == QtGui.QMessageBox.Yes:
            event.accept()

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    mainWindow = MainWindow()
    mainWindow.show()
    sys.exit(app.exec_())

---

如果你想尽可能多地保留你的结构，试试这个：

from PyQt4 import QtCore, QtGui


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(277, 244)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
        MainWindow.show()


class MyWindow(QtGui.QMainWindow):
    def closeEvent(self,event):
        result = QtGui.QMessageBox.question(self,
                      "Confirm Exit...",
                      "Are you sure you want to exit ?",
                      QtGui.QMessageBox.Yes| QtGui.QMessageBox.No)
        event.ignore()

        if result == QtGui.QMessageBox.Yes:
            event.accept()


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = MyWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    sys.exit(app.exec_())

Answer 2

这是我的解决方案，

    def closeEvent(self, e):
        close = QMessageBox.question(
            self,
            "Close Application",
            "Are you sure?",
            QMessageBox.Yes | QMessageBox.No,
            QMessageBox.No
        )
        e.ignore()
        if close == QMessageBox.Yes:
            e.accept()