对QFileDialog进行子类化

from PyQt5.QtWidgets import QFileDialog, QPushButton, QVBoxLayout, QWidget

class CustomFileDialog(QFileDialog):
    def __init__(self, *args, **kwargs):
        super(CustomFileDialog, self).__init__(*args, **kwargs)
        
        # 创建一个自定义按钮
        self.customButton = QPushButton("Custom Button")
        
        # 连接按钮的点击事件到一个自定义槽函数
        self.customButton.clicked.connect(self.onCustomButtonClick)
        
        # 获取对话框的布局并添加自定义按钮
        layout = self.layout()
        layout.addWidget(self.customButton)
    
    def onCustomButtonClick(self):
        print("Custom button clicked!")

# 使用自定义的文件对话框
if __name__ == "__main__":
    import sys
    from PyQt5.QtWidgets import QApplication
    
    app = QApplication(sys.argv)
    dialog = CustomFileDialog()
    dialog.show()
    sys.exit(app.exec_())