Re: hint for vertical writing mode to input method

[Makoto Kato <m_kato ga2 so-net ne jp>]

Hi, Matthias.  Thank you for reply.

This hint will be used on candidate window layout by IME.

By default, each word item into candidate window is top to down. [*1]

Although I create screenshots [*2] for Windows and OSX, both OS's IMEs
can change the layout (item is right-to-left or left-to-right) of
candidate window by setting vertical layout value to IME.

Although we (Mozilla) want to implement this behavior for GTK [*3],
GTK has no API or property for this unfortunately.  Also, we already
have implemented on Windows and OSX for this.

If GTK adds a way for this, I will negotiate to IME developers (ibus,
fcitx and etc)  to implement vertical layout support (changing
candidate window to vertical layout mode etc) and support it.


[*1] https://dvcs.w3.org/hg/ime-api/raw-file/default/images/image05.png
[*2] http://wontfix.blogspot.com/2015/04/vertical-layout-on-ime-sample.html
[*3] https://bugzilla.mozilla.org/show_bug.cgi?id=1130937

-- Makoto

On Mon, Apr 6, 2015 at 11:44 AM, Matthias Clasen
<matthias clasen gmail com> wrote:
> On Tue, Mar 31, 2015 at 3:30 AM, Makoto Kato <m_kato ga2 so-net ne jp> wrote:
> > Hi, GTK team.
> >
> > Mozilla is implementing vertical-writing spec [*1] to Gecko rendering
> > engine.  But GTK has no API to add hint of vertical writing mode to
> > input method.
> >
> > Other OS already has the following method / attribute for this case.
> >
> > OSX / Cocoa
> > drawsVerticallyForCharacterAtIndex method
> > https://developer.apple.com/library/mac/documentation/Cocoa/Reference/NSTextInputClient_Protocol/index.html#//apple_ref/occ/intfm/NSTextInputClient/drawsVerticallyForCharacterAtIndex:
> >
> > Windows / TSF
> > TSATTRID_Text_VerticalWriting attirubte
> > https://msdn.microsoft.com/en-us/library/windows/desktop/ms629018%28v=vs.85%29.aspx
> >
> >
> > Do you have a plan to add an attribute or API of vertical writing hint
> > to GTK?   If nothing, could you add this to any property such as adding
> > GTK_INPUT_HINT_VERTICAL_WRITING to GtkInputHints?
>
> There's no 'plan' for this. Adding such a hint to the enum would be
> pretty easy, of course. Note that these hints are currently not used
> for anything in practice. No application (that I know of) sets them,
> and no input method (that I know of) looks at them. How would your new
> vertical writing hint be set or used ?