Can't a Wayland compositor do the window decorations like on X?

So I realize this is an issue that seems to be somewhat contested. I've heard people are upset that Wayland will have client-side window decoration, and I happen to agree. It doesn't sound like 开发者_如何学编程a good idea at all. But isn't one of the benefits of switching to Wayland that it is more flexible? I don't see why a Wayland compositor couldn't do the window decorations itself? For example, compiz does it's own window decorations already (albeit in a different process). If compiz will be "ported" to work with Wayland, which I understand it will, then we still haven't lost window decoration, right?

Wayland could do decorations in the compositor, sure. But the compositor and the app's UI toolkit have to agree on who's doing decorations (or else you get double-decorated), and I think people just prefer to have the toolkit do it in order to get more design flexibility. Changing window system is an opportunity to change this decision.

If you have everything drawn in the same codebase then you can mix-and-match visual and functional details more easily instead of having some details inherently belong in an "outer frame" and others inside the window. That allows a Google Chrome type of look or allows a theme with a continuous gradient including titlebar and app background or whatever, things like that.

You could, I think, still support UI implemented by the compositor for forcing an app to move, such as Alt+click, forcing an app to close, etc.

Anyway there are definitely some threads on the net hashing out the pros and cons in more detail, I guess that's a tangent.

If I understood this right, the toolkit of the application gets to decide if it uses decoration or not, this is definetly bad, as anyone can create a custom toolkit, or customize it to show custom decorations. If this is true, then I hate the idea, I imagine each and every propietary app for linux using this, and also gtk and qt apps looking different. This would cause a disaster, if I have to look at something like anti-virus on windows, I guess I'll propably have to start using BSD or haiku OS