Qt 彈出式菜單陰影

相關文章： 剖析QMenu & Qt完全定制化菜單

 

bool Menu::event(QEvent *event)
{
    static bool class_amended = false;
    if (event->type() == QEvent::WinIdChange)
    {
        HWND hwnd = reinterpret_cast<HWND>(winId());
        if (class_amended == false)
        {
            class_amended = true;
            DWORD class_style = ::GetClassLong(hwnd, GCL_STYLE);
            class_style &= ~CS_DROPSHADOW;
            ::SetClassLong(hwnd, GCL_STYLE, class_style);
        }
       
    }
    return QWidget::event(event);
}

大概思路是:　在event中截獲QEvent::WinIdChange事件, 然后獲得窗口handle,  使用GetClassLong / SetClassLong 去除 CS_DROPSHADOW flags, 即可去除陰影