This concerns Ticket #109: Add Lua support for Edje
It adds Lua as scripting facility to Edje, letting Embryo untouched.
It should be easier to use and be more flexible than Embryo, imho ;-)
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The patch
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Lua 5.1 is used in sandboxed mode. Lua byte code is not
platform/architecture independent, Lua code is saved as text in the Edje
container and parsed at load time, therefore.
The patch goes in two directions
1) Analogous to Embryo for scripting logic, messaging and custom states.
The same things are implemented as in Embryo:
- messaging from and to C
- manual creation of timers, animators, pollers for custom events /
animations
- manual manipulation of Edje parts by means of the public
edje_object_part_* and internal functions and custom states
-> those routines are actually implemented as Lua
bindings to
functions in Edje.h and Ecore.h
-> the implementation is done in an object oriented way, so that the
interface gives the feel of an object description language, pretty
similar to EDC itself
-> combining custom states and custom animators allows
for fancy
animations and transitions, e.g circular/spline translations or
complex/conditional transitions, etc.
-> this is just the same as Embryo does, but implemented in Lua, so
nothing new here, actually
2) Dynamic object creation and manipulation
- this interface stems from the 'script_only' objects in
Edje. Those
objects are a kind of scriptable Edje counterparts to Evas_Smart
objects. The infrastructure for Embryo is already there, but has
never been used
- I added this in Lua and added some first bindings to
experiment
with
- I thought it would be useful to allow for a limited dynamic
creation of ui parts
- We can create instances of groups from within the same Edje
container and use them just like the main Edje object as
stated in
1)
- And there are some stand-alone bindings to dynamically create
Evas_Image, Evas_Table, Evas_Line, Evas_Polygon as examples
-> this may be useful to decouple the program from the ui
even more,
to be able to do things that have to be done in the program itself
atm, but actually belong to the user interface, but need dynamic
creation of objects or complex interactions
-> those objects are manipulated manually with Lua bindings
to the
corresponding edje_object_* and evas_object_* functions
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Discussion points
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Both stuff in 1) & 2) is functioning, but needs testing, feedback,
improvements, ...
Stuff in 1) can already fully replace Embryo scripting with Lua
scripting. There still is space for improvements/additions, though.
Of the stuff in 2), I think it may only make sense to add the dynamic
creation of groups defined in the same Edje container. Dynamic creation
of other Evas_Objects makes not much sense, as most of them can already
be used as Edje parts and be manipulated with custom states (apart from
polygons and lines) and it would make the whole theming potentially more
programing-like and much more susceptible for errors, etc.
Would this be useful, or drop it all?
The scripting should be there just for logic, conditionals, custom
states and animations, not for a whole dynamic canvas, imho.
There is a patch around with EXTERNAL Edje parts. Seems to be a better,
faster, more secure way to extend Edje with custom objects.
There would be the possibility of precompiling Lua code at compile time
(edje_cc) for faster loading, but we would have to patch and run our own
Lua version.
The Lua parser is pretty fast, though, and using
byte-converted/endianness-swapped byte-code does only pay off for Lua
chunks of some kilo lines.
Byte code also occupies much more space than text in the final Edje
container, as it includes debug symbols.
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Cedric and Vincent told me, that the plan was to replace Embryo totally
by Lua before the official release of Edje at the end of the year? So it
would make sense to bring Lua to svn soon and look how it fits in, test,
debug, adapt it further to the themers needs, decide on its final shape,
GATHER SOME PEOPLE TO HELP ;-)
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The Lua enhanced Edje is in sync with svn and can be get directly here
git clone git://repo.or.cz/edje_lua.git
cd edje_lua
git checkout -b lua_patch origin/lua_patch
or apply the attached patch
There are also some examples to show the usage of the things
mentioned
above
- showcase.edj: shows usage of custom animators, custom states,
messaging and the script_only object
- test.edj: test cases of script usage and bindings (custom states,
custom transitions, tween_states, animators, timers,
object_parts),
but most of it are experimental script_only objects
http://didgmo.sourceforge.net/showcase.edjhttp://didgmo.sourceforge.net/test.edj
The source of showcase.edc is attached, too, to just have a glimpse at
Lua inside of EDC
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So, what do you guys think?
Thanks and sry for the looong mail, hehe ;-)
SVN revision: 41802
Note: A bug spotted in layout of box is the reason of this revert. From
my understanding, layout require some property on the object to be
correctly set. This is done during edje_recalc_single on the part. The
layout fonction of evas would be called just after the resize. If we
didn't do an edje_recalc_do, but an edje_recalc, the call to
edje_recalc_single will be delayed and the layout property will not be
set correctly.
SVN revision: 41698
WARNING: THIS CAN CAUSE RENDERING GLITCH AND OTHER WEIRD BEHAVIOUR WITH
YOUR EDJE FILE. PLEASE REPORT ANY ALIEN STUFF.
Note: This patch cache the result of _edje_part_recalc_single, until
any relative part are moved, the object is resized or some property
are changed (like during text set or color class set).
Note: Be carefull when you call edje_object_size_min_restricted_calc,
it's really an inderect heavy user of _edje_part_recalc_single and
I wasn't able to bring it down.
Note: This patch use more RAM, around 480 bytes per Edje state, so I
don't recommand using it on a Desktop with a lot of CPU power.
SVN revision: 41663
This makes use of new Evas_Smart_Class calculate() callback to
postpone calculations until render time, possible saving lots of
calculations to happen.
It is another try, with Cedric's changes to force recalculations when
requried (ie: just before doing some edje_object_*_get()), let's see
if this one solve found issues.
SVN revision: 37620
Edje is tricky, it's event processing is too weird and Cedric's
changes to make it work are not working as expected. Edje freezes
itself while processing signals, but in mouse down cb it forces
recalculate, which seems was previously ignored, but now they are not.
We should look at how to fix this and then re-apply this patch.
SVN revision: 35908
Some people is using it for some time now without problems, so I'm
adding it to SVN to get some broader use. Remember to recompile ALL
libraries that depend on Evas as it will change the
EVAS_SMART_CLASS_VERSION and old classes will fail to load.
This will also change Edje so it will postpone _edje_recalc() to
render time, calculate() callback, however some methods will force
early recalculation.
SVN revision: 35860
having an almost parallel codepath for script_only objects - they dont get to
use the older edje api calls for part defined objects. they will have a new
set of calls specifically for them. it's partly done - very little available
now, but will expand. lots of fixme's.
SVN revision: 34699
it sould be
2. fixed edje handling of delete of objects so we don't lose clip info if we
move a swallowed object out
3. fix up norender stuff for evas a bit
4. pants.
5. coogee beach (sydney) in summer right now is beatiful - KICK ASS!
SVN revision: 28102
akuma no code desu!
there are a LOT of paths that lead to calling external callbacks froma
pgoram thaty will invalidate the loop or code just after that call-
causing... segv's and all sort sof fun goodies. i've blocks/locks off a lot
of them... i hope i haven't missed any - but it's likely. tread carefully
within callbacks!
SVN revision: 7375
fixem's have been fixed. text parts work fully now, ALONG with all their
respective effect modes, fits, alignments and "chopping". a few more api
calls have been added and cleaned up. you'll need to update eet too for this
to work.
SVN revision: 7113