styled dialogs for pa

[Marco Martin]

Hi all,

to make coherent looking dialogs all around, there is the Dialog component in 
the standard set (one is used for instance in the timezone selection on active 
settings)

one complaint was that it wasn't looking too much mobile, since the window 
appeared immediately and clicking on the background didn't dismiss.

( when continuous integration will be again up and running, consistent update 
of images and whatnot will be in place again ;)
now there is a partially tranlucent/black fullscreen background that fades in, 
the dialog itself slides from the bottom, clicking on the background dismisses 
the dialog.


i am not sure the animations will be fast enough since they are done by the 
application event loop, it may be necessary have kwin doing this, we'll see.


particularly interesting is the how the thing is done (quite epic): since is 
not possible to have private c++ classes in qml usable only inside the 
components, it's a c++ import that has the exact api of the Dialog component, 
and loads a qml file of an implementation of Dialog.

at that point, it creates a maximized qgraphicsview and puts the object 
created from the qml file in it.

so we have the code made to do a new window in c++, but only Dialog being able 
to use it

(the last thing on earth i want is random qml plasmoids being able to create 
fullscreen windows ;)

so, if this will prove actually working, it will be worth to see if the epic 
hack can be used to have other things that really need to be done in c++ -and- 
private.

Cheers,
Marco Martin