How to let Qt Application stay on desktop and translucent?

[mikumiku]

I want the application will remain on desktop when win+d pressed,and it is translucent.
SetParent(w.winId(),desktopHwnd) can make Widget stay on desktop but if I use this function setWindowOpacity() won't work.
How can i do it?

[vezprog]

Have a look at this (don't worry about the frameless window part):
http://qt-project.org/forums/viewthread/1107

Also, what do you mean remain on desktop? Do you mean, you don't want it to be able to minimize?

If so, you can override the changeEvent(QEvent *event) in your window class and check if the window is being minimized, then show how ever which way you want it.

For example:
@
// change event (protected)
void MainWindow::changeEvent(QEvent *event){
if (event->type() == QEvent::WindowStateChange){
if (isMinimized()) // check if the window is minimized
show();
}
}
@