[immodule-qt] Surrounding text
kaminmat at cc.rim.or.jp
Tue Sep 7 19:01:45 EEST 2004
On Tuesday 07 September 2004 13:05, Anuradha Ratnaweera wrote:
> On Tue, 7 Sep 2004 00:03:41 +0900, Daisuke Kameda <kaminmat at cc.rim.or.jp>
> > > What's the status of surrounding text support in the QT 3 patches?
> > We want to support surrounding text. But nothing is implemented yet.
> > And, Although based on the quantity of changes, probably it will be
> > introduced in Qt4 or after it.
> If we are interested in implementing it (not necessarily commiting to
> QT proper) hope you guys will help us getting in to the world of
> qt-immodules! (I am sure you don't have all the time in the world,
> but an occational tip or an anwer will be sufficient ;-))
Thank you for reply. I want to cooperate with you about
surrounding text support.
> > - Are there any good material about surrounding text?
> > - Does the code about surrounding text implemented in gtk have
> > sufficient function?
> Let me answer the both question in one: The only good material about
> surrounding text we found is in GTK. I think XIM also has something
> like that, but we never could figure out how. (Yes, I have looked at
> Surrounding text in gtk has [at least] two functions.
> gtk_im_context_get_surrounding() gets the surrounding text and the
> present location of the `cursor' in that text, and
> gtk_im_context_delete_surrounding() which allows deleting characters
> (not bytes) around the cursor. This is sufficiant to do what we need
> to do.
> It would have been better if the former function accepted a "max
> offset" kind of parameters, because we don't need all the characters
> in the surrounding.
I have read GTK's code. GTK's surrounding text support is consisting
of retrieve_surrounding signal, delete_surrounding signal,
gtk_im_context_get_surrounding(), gtk_im_context_set_surrounding() and
Probably, this design will not be able to be simply transplantable to Qt.
However, for example, realization of the function will become possible
by adding IMEvent (IMGetSurrounding and IMDeleteSurrounding) and
And, I plan to investigate the usage of it in XIM.
> > - Which country needs surrounding text support?
> We are adding Sinhala language support. Sinhala is the main language
> used in Sri Lanka. Our project page is http://sinhala.linux.lk .
> Surrounding text is necessary to implement the traditional Wijesekara
> Keyboard and the new national standard being developed based on it.
> We also have a transliterated keymap (already implemented for GTK)
> which again produces different characters based on context.
> Of course we _could_ create a keymap, but according to our experience
> and user feedback, usability of a context sensitive input method is
> far far superior. The main reason is, characters, keystrokes, and
> visual glyphs don't have a one to one relationship.
Daisuke Kameda <kaminmat at cc.rim.or.jp>
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