我尝试了QGraphicsOpityEffect 应用到 QDialog, 但结果是一个半灰色的部件, 我看不到后面的背景和活动, 顶级部件 。
使用 < a href=" "http://qt-project.org/doc/qt-4.8/qwidget.html#windowOpeaceity-prop" rel="no follow"\\code>set WindowOpecity 函数。
The valid range of opacity is from 1.0 (completely opaque) to 0.0 (completely transparent).
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