Re: XIM String Conversion Callback
- From: Owen Taylor <otaylor redhat com>
- To: gtk-i18n-list gnome org
- Subject: Re: XIM String Conversion Callback
- Date: 04 Jan 2001 11:17:25 -0500
Steve Underwood <steveu coppice org> writes:
> Owen Taylor wrote:
> > Reconversion is especially tricky and I'm not sure it should be
> > joined together with context.
> > For getting context, my current idea of how it should look is:
> > GtkIMContext should have a signal ::retrieve_context() which has parameters
> > indicating the desired context region.
> > When the owner of the context (the GtkEntry, for example), gets this
> > signal, it should call:
> > gtk_im_context_set_context (GtkIMContext *im_context,
> > gint position,
> > gchar *context_text,
> > gint length);
> > Where position is the offset (in bytes, not including the
> > preedit string) of the start of the context string from the cursor
> > position.
> I think there are likely to be contention problems here between what
> the app thinks is the current context, and what the IME might
> do. Defining context requires a model of "context", and that varies
> between input methods, even for a single language. Is the context
> the last few characters which form a polysyllabic word in Chinese?
> Is it the sentance to date (where "sentance" can be a slightly vague
> term in some languages)? The XIM documentation doesn't really
> address these issues. It just vaguely refers to "context".
Well, the idea here is that the ::retrieve_context signal would
have parameters specifying how much context the input method
wants. This would be similar as to how in XIM, the
StringConversionCallbackStruct has a direction argument
which can be XIMLineEnd,XIMForwardChar,XIMBackwardChar, etc.
(Section 126.96.36.199 of the Xlib manual)
The definition of the units would be in terms of the boundaries
determined by pango_get_log_attrs().
> Actually, I'm not sure precisely what you mean by context and
> reconversion in your
> comments. By "reconversion" are you just refering to the repeated
> changes of the pre-edit string, or something more?
"recoversion" means taking areas of text that have already been
converted into the final form and sent to the client and changing them
back to a preedit string.
Usually the way this would work is that the users selects a
part of the text that was misconverted and hits a hot key
or selects a command from a menu. Alternatively, while editing,
there may be a hot keys to reconvert the previous word, etc.
I've never actually used a system with reconversion, but it
apparently can be useful.
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