QMainWindow 和QWidget相互控制

QMainWindow 和QWidget相互控制

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout, QPushButton, QLabel

class MyMainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle('Main Window')
        self.setGeometry(100, 100, 600, 400)

        self.label = QLabel("Main Window", self)
        self.setCentralWidget(self.label)

        self.close_button = QPushButton("Close and Show QWidget", self)
        self.close_button.clicked.connect(self.close_and_show_widget)
        self.setCentralWidget(self.close_button)

    def closeEvent(self, event):
        print("QMainWindow closeEvent triggered")
        event.accept()  # Accept the close event

    def close_and_show_widget(self):
        self.close()
        self.widget = MyWidget(self)
        self.widget.show()

    def __del__(self):
        print("QMainWindow is being destroyed")

class MyWidget(QWidget):
    def __init__(self, main_window):
        super().__init__()
        self.main_window = main_window
        self.setWindowTitle('New Widget')
        self.setGeometry(150, 150, 300, 200)

        layout = QVBoxLayout()
        label = QLabel("This is a new QWidget", self)
        layout.addWidget(label)

        self.return_button = QPushButton("Return to Main Window", self)
        self.return_button.clicked.connect(self.return_to_main_window)
        layout.addWidget(self.return_button)

        self.setLayout(layout)

    def return_to_main_window(self):
        self.close()
        self.main_window.show()

app = QApplication(sys.argv)
mainWin = MyMainWindow()
mainWin.show()
sys.exit(app.exec_())