ubuntu-phone team mailing list archive

[Matthew Paul Thomas <mpt@xxxxxxxxxxxxx>]

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Sebastien Bacher wrote on 06/03/14 18:08:
> 
> Le 06/03/2014 19:02, Marc Deslauriers a écrit :
>> 
>> Wouldn't a better design be to have the lock screen in the
>> user's session? That way each user can have their own lock
>> screen, and it can access the user's data without any security
>> issue and difficulty in transferring data between different
>> security contexts...
> 
> That' what we have been doing so far (on desktop), it has those 
> advantages but also issues:
> 
> - you get 2 codebases to maintain
> 
> - you can't do user switching on the lock screen, so you need to
> to support bouncing users between those
> 
> - design suggested the user experience is more confusing (mostly 
> because you have similar screens with small difference and it's
> not obvious why that)
> 
> ...

I think that's because this was considered mainly as a visual design
problem: "these two screens look roughly the same, let's make them
exactly the same".

But they behave very differently: music should keep playing at the
lock screen but not the greeter, the camera and mic should keep
recording at the lock screen but not the greeter, Touch apps may allow
limited access at the lock screen but not the greeter, your preferred
keyboard layout should persist at the lock screen but not the greeter,
screen magnification should persist at the lock screen but not the
greeter, and so on.

Things that behave different should look different, which leads to the
conclusion that the lock screen shouldn't look like the greeter after all.

(This reminds me of the logic "snap decision dialogs look roughly like
notification bubbles, let's implement them in the notification
system", which has led to similar poor containment, e.g. Unity8 having
to contain knowledge about the format of SIM PINs.)

- -- 
mpt
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