Hello all,

I have some terrible news to announce here.


In order to alter the behavior and fix oddities in the theme (eg. "left"
part for the upper side of a panes widget), add the necessary new features
(eg. "background" swallows and color classes), and remove unwanted things
(ActionSlider, anyone? ^^), we need to branch off the theme for EO widgets
into a separate category. Eventually this should become the only default
theme for EFL 2.0 and could be a separate EDJ file soon.

Here are some of the points we're trying to address with this new theme:

- simpler naming for groups (eg. "efl/button" for the base group for the
default style of a button). This should have benefits both for performance
(shorter strings, less memory stress) and readability

- use color classes / text classes / size classes everywhere possible (also
with simple names and inheritance, if we manage to find a proper solution
in edje)

- add "background" swallow in most widgets that could have a nice custom
background (eg. a button, frame, etc...). See also 3c47a4f9f9ef77 (can and
should be improved further).

- more consistent part names, they should match 1:1 with the part names in
EO files. There are exceptions were "virtual" parts are used in EO (i.e.
the part is not a real object) or if those parts are sub objects manually
managed by the widget. Real parts should be marked as "required: 1" in EDC.

- more consistent signal names, including a clear definition of "action"
and "state" changes.


The downsides to this tough decision are quite obvious:

- More theme work to do for custom themes (unless you only care about EO or
only about legacy)

- Less testing of the new theme (same as when introducing new classes)

- It's a crazy amount of work to make sure everything is consistent and
complete.


I'll be merging a patch introducing this new theme very shortly. See D5473.


I really wish there was a better solution but we couldn't find another way
that doesn't break the existing theme API (which would be totally
unacceptable).


Best regards,

-- 
Jean-Philippe André
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