演示 RectangularShadow 用法。
此范例演示 RectangularShadow type, which offers an efficient solution for applying rounded rectangle shadows and glows. The API of the RectangularShadow matches to CSS box-shadow element, with some additions.
要运行范例从 Qt Creator ，打开 欢迎 模式，然后选择范例从 范例 。更多信息，见 Qt Creator：教程：构建并运行 .
