Qt Widgets 设计器集成
Qt Widgets 设计器是预览样式表的绝佳工具。你可以右键单击 Designer 中的任何部件，然后选择 来设置样式表。Change styleSheet...
在 Qt 4.2 及更高版本中，Qt Widgets Designer 还包含一个样式表语法高亮器和验证器。验证器会在Edit Style Sheet 对话框的左下方显示语法是否有效。
单击OK 或Apply 后，Qt Widgets Designer 将自动显示带有新样式表的 widget。
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