Text direction for languages such as arabic

[Jacopo]

I wonder if there is any way to render right-to-left some Arabic text.

Thanks,

j.

[Akshay Arora]

I'm assuming you need to input text from right to left in TextInput, If so then there is no support for that right now.

However we would appreciate it if some one with some experience with right to left languages can look into it(pull requests any one?) or at-least give some pointers as to what's the difference/what things to look out for, namely::

1) Is it just about rendering right to left or is there also some consideration to be taken about using bottom to top instead of top to bottom?
2) Is there something in common with the approach taken in languages that require top to bottom rendering (chinese/japanese/... I don't know that's  why I'm asking)?

Best Regards

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[Jacopo]

It's not really about text input.

I give a practical example.

I have a config file formatted in JSON (with all Unicode characters escaped).

In this file there is a list of supported (by the app I am developing) languages, among which Arabic.

[
// ...
{
  'abbr': 'ar',
  'native': 'العربية'// actually escaped: \u0627\u0644\u0639\u0631\u0628\u064a\u0629
},// ...
]

Then the app loads the file, parses it and translate it into a python list of dicts (with the std library) - LANGS.

At a point in the code I add Buttons like that

for l in LANGS:
    self.add_widget(Button(text=l['native']))

All is rendered fine with left-to-right languages, but Arabic is rendered left-to-right too - actually, the order of the characters is inverted:

My question was if it is possible to just render, not insert, properly those languages which are right-to-left.

But from your kind reply it seems there is no support yet. And unfortunately I have no knowledge about those languages. So I just hope with you that someone with this knowledge will kindly give some help.

Cheers!

[Thomas Hansen]

It's just the order of characters  not the characters themselves that are inverted right?  Otherwise we could just flip the texture by setting texture coordinates :P

[Thomas Hansen]

Otherwise, can you invert the string, and then right align?

try this: 

https://gist.github.com/hansent/4771591

[Akshay Arora]

I think it's a lot more than just inverting of characters, it's also about how some characters need to be merged into one complex character including diacritics.

Some reference material.


http://mpcabd.igeex.biz/python-arabic-text-reshaper/

Seems like a good staring point

[Akshay Arora]

Using the approach above seems to take care of merging characters together and it allows for usage of multiple(RTL and LTR) scripts at the same place.

http://paste.opensuse.org/40270994
See attachment.

Best Regards

[Jacopo]

It works!! Thanks a lot!!!

[Jesus_Is_My_Lord]

Not work when we build APK