How to draw this window?

Can I create a window without this topbar? :

开发者_如何学运维

I want a window like this:

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Here they say you could try:

gtk.Window.set_decorated(False)

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You could also do

window.set_type_hint(gtk.gdk.WINDOW_TYPE_HINT_SPLASHSCREEN)

but that doesn't have rounded corners either, at least on my theme. As eumiro says, that depends on the theme settings.