[PATCH RFC] Add language and text-direction to text protocol

[Yichao Yu]

On Thu, Jan 31, 2013 at 2:50 PM, Jan Arne Petersen
<jpetersen at openismus.com> wrote:
> On 31.01.2013 18:00, Yichao Yu wrote:
>> On Thu, Jan 31, 2013 at 11:44 AM, Jan Arne Petersen
>> <jpetersen at openismus.com> wrote:
>>> From: Jan Arne Petersen <jpetersen at openismus.com>
>>>
>>> The proposed API allows to send the language and text-direction for
>>> inserted text from an input-method to an application.
>>
>> Can't really see why text-direction (of the input window) is useful,
>> shouldn't that be a property of the language?

O sorry, I though the text_direction was a request from the client. If
it is used to tell the client of the language and the text direction
in-use, it makes perfectly sense for me.

>
> Usually it can be just deduced from the language but I remember the case
> of entering phone numbers, which were also LTR-numbers in RTL-languages.
>
>>> It also allows an application to specify a preferred language for
>>> the input. This could be used by an application to set a language
>>> by context or to request the last used language after an input
>>> entry regains focus.
>>
>> I believe the input method have better knowledge of the language in
>> use and being able to remember that on a per context state? (or do you
>> mean the context will be destroyed when the text_model lost focus??)
>
> Currently the context is state-less but even when we add state there, in
> Qt, for example, there is currently just one input context per
> application not one per widget.

The whole point is not about distinguishing different clients, it's
about tracking the state. It doesn't matter how many input context an
application created, but the input method must be able to know if it
is dealing with a same input_context and restore states accordingly.
(well the client is able to destroy this by recreate a context
whenever it get focus but that is definitely a bug.) A state less
input method context is plain wrong.

P.S. if you are looking at ibus-qt, you may want to have a look at
qt's xim and fcitx immodule, both of them create input context per
main window.

>
> --
> Jan Arne Petersen
> Openismus GmbH
> http://www.openismus.com