[arch-general] IBus Qt

Grady Martin sunnycemetery at gmail.com
Fri May 11 03:12:34 UTC 2018

I could not have asked for a better explanation.  Thank you very much.

Some of this should be mentioned on the wiki page.  Would you like to add it?  Would it be all right if I added the information, referencing this mailing list post?

On 2018年05月10日 13時34分, Jiachen YANG via arch-general wrote:
>On 2018年05月10日 10:30, Grady Martin via arch-general wrote:
>> From <https://wiki.archlinux.org/index.php/IBus>:
>>> Additionally, to enable IBus for Qt applications, install the ibus-qt
>>> library.
>> Since 2012, I have used IBus with Qt applications and have yet to
>> encounter a single problem, yet I have never installed ibus-qt.  Can
>> anyone clarify this statement from the wiki?
>Hi, I am only using Fcitx in recent years but I think the need for IM
>Modules is the same for both fcitx and ibus, so I will try answer this
>with my experience.
>ibus-qt package provides IM Module shared objects (dynamic libraries)
>for qt applications. IM modules are small instrusive loadable libraries
>that are initiated by the application, and are talking to the IME server
>(ibus/fcitx/etc.) on a native IPC protocol (usually dbus these days).
>Without IM Modules (when not installed or non-qt/gtk applications), the
>application usually fallback to an old protocol called XIM. The
>existence of XIM is why you can type without ibus-qt installed.
>XIM is an old protocol which did not consider async communications by
>design, so it is inherently buggy. For simple IME engine and application
>scenario, modern day PC specs may hide XIM's buggy behavior. But as soon
>as you start to use really advanced IME engines (those developped with
>predictions and machine learning algorithms, large databases, often used
>by Chinese/Japanese users) in modern applications (with multiple threads
>handling rendering and inputs), characters you typed start to go all
>over the place, with a reasonable typing speed. High speed CPU/IO will
>not hide this because IME engines for East Asian languages are designed
>to fully utilize the CPU time between user input intervals, to provide
>better predictions with larger database.
>IM modules are designed to fix XIM's buggy behavior, and they can
>provide far more context information than XIM protocol. Also I believe
>wayland sessions cannot use XIM for native wayland applications, and
>wayland's native IM protocol is far from ready.
>So while you may still type in Qt applications with ibus without ibus-qt
>installed, I think this should still be a general recommandation for
>most users.

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