Qt notification window - growl like, mac specific

#ifdef Q_OS_MAC
#include <Carbon/Carbon.h>
#endif
 
NotifyWindow::NotifyWindow() : QWidget(0 /* This zero is the first point */) {
 
    setWindowFlags(
    #ifdef Q_OS_MAC
        Qt::SubWindow | // This type flag is the second point
    #else
        Qt::Tool |
    #endif
        Qt::FramelessWindowHint |
        Qt::WindowSystemMenuHint |
        Qt::WindowStaysOnTopHint
    );
    setAttribute(Qt::WA_TranslucentBackground);
 
    // And this conditional block is the third point
#ifdef Q_OS_MAC
    winId(); // This call creates the OS window ID itself.
             // qt_mac_window_for() doesn't
 
    int setAttr[] = {
        kHIWindowBitDoesNotHide, // Shows window even when app is hidden
 
        kHIWindowBitDoesNotCycle, // Not sure if required, but not bad
 
        kHIWindowBitNoShadow, // Keep this if you have your own design
                              // with cross-platform drawn shadows
        0 };
    int clearAttr[] = { 0 };
    HIWindowChangeAttributes(qt_mac_window_for(this), setAttr, clearAttr);
#endif
}