Implemented lower window when middle click on titlebar in gtk/mutter

[Mildred Ki'Lya]

Le 07/05/2020 à 11:15, Carsten Haitzler (The Rasterman) a écrit :
>> I suppose that the client can declare the title bar area, and the
>> compositor can then handle clicks in this area. is there something like
>> that already existing? Is there anything that has prevented to do this
>> before?
> So you want this to only happen when middle-clicking in the titlebar? Then it
> does require the client to deal with it as only it knows precisely the things
> in a titlebar that are the titlebar (and not other buttons too like close and
> what not, and tyring to expose all of this to the compositor to deal with
> just is endlessly complex).
That's why I was thinking that there should be a protocol to let clients 
know where the titlebar area is. Reading past mails, I believe this 
should allow the titlebar to be non rectangular. I saw that there was an 
idea of a mask the client sends to the server. Was it rejected for some 
reason or was it just never implemented?
> So what you need really is clients deal with this. That means every toolkit
> and/or app will have to follow suit and do it too.
This is the other solution, but how do all the clients know it's middle 
click to lower? How do they know it's not middle-click and not 
double-click? How do they know it's lower and not to minimize or 
maximize? We can't reasonably ask every wayland client to look at GNOME 
configuration files (and every other window manager for that matter).
> If you want middle-mouse anywhere to do this (like alt+left mouse drag is
> seconded anywhere to move a window). then the compositor can do this with
> clients being ignorant of it happening.
We can't just steal every middle-click everywhere on the window. It has 
to be on the title bar.
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