On Sat, Apr 17, 2010 at 1:26 PM, Andreas Volz <li...@brachttal.net> wrote:
> Hello,
>
> I search an simple C example for the edje external type. I found
> something, but it doesn't compile and after I got it to compile it
> doesn't work (crash).
>
> Does someone know a good example?
Well, I don't understand your question/requirement, but maybe is due
edje EXTERNAL not having a clear public introduction yet :-)
First, Edje EXTERNAL is our hope to automatize object creation +
SWALLOW, as it tend to be quite tedious. It's almost the same as the
GROUP type, but it work with non-Edje as well, like Emotion and
Elementary, in future EPDF/EDVI/EPS and so on.
In essence it is just an automatic swallow, using the "source: name"
part-level entry to specify the object to load. The "name" string will
be looked up in a hash table that is either registered by the
application itself using
edje_external_type_register()/edje_external_type_array_register() or
automatically by edje using the externals {} block that will load the
module from ${prefix}/lib/edje/ Editje, for instance, add the used
external modules to the file with:
externals {
external: "elm";
}
Then you can load that file with any program, and /usr/lib/edje/elm.so
will be called the eina module init, that in turn will call
edje_external_type_array_register() automatically, making all "elm/*"
strings available to EXTERNAL parts. You can try these things in
edje_player or edje_viewer, or even e17 borders :-D (border
decorations that play video!? :-P)
In order to help with common tasks even further, like define the video
path (if fixed), button label/icon and such common initialized
elements, Edje EXTERNAL parts take parameters per-state. So you can
even specify multiple states that have different parameters. Upon
state change these parameters will be applied, reducing requirement
for C/C++/Python code even further.
Basically that is Edje EXTERNAL support for a "UI Designer" point of
view, you specify non-native objects to be loaded there and you say
how they should look like. Try editje to get some files, or use its
own example in editje/test/sample.edc. You can see example of
Emotion usage in my email
http://www.mail-archive.com/enlightenment-devel@lists.sourceforge.net/msg24939.html
For the application developer point of view, you can just handle it as
other part, ignoring it if it was not expected by you, or using
edje_object_part_external_object_get(), or other functions to set
basic parameters with edje_object_part_external_param_set(). However,
it is advised that if the application developer knows it should be a
specific object type, say elm/button, then user should use the
edje_object_part_external_object_get() followed by native calls as
elm_button_label_set(). This is important for performance reasons.
The helper edje_object_part_external_param_set() in the case
applications do not need performance or they can deal with multitude
of object types that have the same property names (like we do in Edje
itself with TEXT and TEXTBLOCK, edje_object_part_text_set() works for
both). The multitude of objects, in this case, would be defined by
the UI designer, like a using a a elm/button or elm/radio, they all
have "label" property.
Not all methods are supported by Edje EXTERNAL, and they will likely
remain as it. For instance, we support elm/list, but you need to add
the list items from C code.
Last but not least, you have the developer that provides EXTERNAL
objects, that are used by the above cases. This is being done by
ProFUSION for most of Elementary widgets and is quite complete, maybe
too much to use as learning base. So I did the Emotion version in
emotion/src/edje_external. It is quite simple to understand.
Basically you expose some meta-information targeted at Editors (like
Editje) so it can show label, description, icon... It also provides
some callbacks to let you do your work, like creating the object and
set/get of properties.
Overall we already noticed some missing bits, like a way to instruct
the Editors that some properties are read-only, write-only or should
be used just once for construction of the objects. These flags will
come with time.
BR,
--
Gustavo Sverzut Barbieri
http://profusion.mobi embedded systems
--------------------------------------
MSN: barbi...@gmail.com
Skype: gsbarbieri
Mobile: +55 (19) 9225-2202
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