import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, QDialog, QVBoxLayout, QLabel
class CustomDialog(QDialog):
def __init__(self, parent=None):
super().__init__(parent)
self.setWindowTitle("Dialog Window")
layout = QVBoxLayout()
self.dialog_button = QPushButton("Show Message in Main Window", self)
self.dialog_button.clicked.connect(self.show_message_in_main_window)
layout.addWidget(self.dialog_button)
self.setLayout(layout)
def show_message_in_main_window(self):
if isinstance(self.parent(), MainWindow):
self.parent().statusBar().showMessage("你好")
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.setWindowTitle("Main Window")
self.central_widget = QPushButton("Show Dialog", self)
self.central_widget.clicked.connect(self.show_dialog)
self.setCentralWidget(self.central_widget)
self.statusBar().showMessage("欢迎使用")
def show_dialog(self):
self.dialog = CustomDialog(self)
self.dialog.show()
def main():
app = QApplication(sys.argv)
main_window = MainWindow()
main_window.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
