On Tue, Sep 22, 2009 at 8:03 PM, Jaime Thomas <avi.tho...@gmail.com> wrote:
> On Mon, Sep 21, 2009 at 1:20 PM, Atton Jonathan
> <jonathan.at...@gmail.com> wrote:
>> It seems like the message function in a lua script isn't called when we send
>> a message from a C program.
>>
>> lua script:
>> lua_script {
>> function init (ed)
>> print 'init'
>> end
>>
>> function message(ed, typ, id, ...)
>> local custom
>> print 'custom'
>> custom = ed.shadow:custom_state ("default", 0.0)
>> custom.rel1 = {0.3, 0.3}
>> custom.rel2 = {0.6, 0.6}
>> ed.shadow.state = {'custom', 0.0}
>> end
>> }
>>
>> embryo script:
>> script {
>> public message(Msg_Type:type, id, ...) {
>> custom_state(PART:"shadow", "default", 0.0);
>> set_state_val(PART:"shadow", STATE_REL1, 0.3, 0.3);
>> set_state_val(PART:"shadow", STATE_REL2, 0.6, 0.6);
>> set_state(PART:"shadow", "custom", 0.0);
>> }
>> }
>>
>> The embryo script works well but the lua script didn't. The message "custom"
>> is never print in stdout.
>
> If you add in lua_script_only: 1; before the script it works. I've
> attached a patch that uses the lua_State for the collection, and
> allows for message sending without script_only. It seems to work here
> but perhaps Hanspeter could comment on its correctness.
Never mind, it allows you to call the function but not to do anything
useful inside it.
>
>>
>> 2009/8/12 Hanspeter Portner <vento...@airpost.net>
>>
>>> 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 ;-)
>>>
>>> ---
>>> The patch
>>> ---
>>>
>>> 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
>>>
>>> ---
>>> Discussion points
>>> ---
>>>
>>> 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.
>>>
>>> ---
>>>
>>> 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 ;-)
>>>
>>> ---
>>>
>>> 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.edj
>>> http://didgmo.sourceforge.net/test.edj
>>>
>>> The source of showcase.edc is attached, too, to just have a glimpse at
>>> Lua inside of EDC
>>>
>>> ---
>>>
>>> So, what do you guys think?
>>>
>>> Thanks and sry for the looong mail, hehe ;-)
>>> Hanspeter
>>> --
>>> Hanspeter Portner
>>> vento...@airpost.net
>>>
>>> --
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>>
>>
>> --
>> Regards.
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