带有关闭按钮但隐藏工具栏、最小化和最大化按钮的QtDialog

import sys
from PyQt5.QtWidgets import QApplication, QDialog, QVBoxLayout, QPushButton

class CustomDialog(QDialog):
    def __init__(self):
        super().__init__()
        
        # 设置窗口标志，隐藏最小化和最大化按钮
        self.setWindowFlags(self.windowFlags() | Qt.WindowCloseButtonHint)
        
        # 创建布局和控件
        layout = QVBoxLayout()
        button = QPushButton("关闭")
        button.clicked.connect(self.close)
        
        layout.addWidget(button)
        self.setLayout(layout)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    dialog = CustomDialog()
    dialog.show()
    sys.exit(app.exec_())

self.setWindowFlags(self.windowFlags() | Qt.WindowCloseButtonHint)

screen = QApplication.primaryScreen().geometry()
size = self.geometry()
self.move(int((screen.width() - size.width()) / 2), int((screen.height() - size.height()) / 2))