• LRN's avatar
    GDK W32: Support switching IM contexts at runtime · 66c0336e
    LRN authored
    This leverages the normal input context switching mechanism in GTK
    by making it think that the gtk-im-module setting changed.
    The backend returns gtk-im-module value as "ime" if W32
    IME API says that an IME is in use. Otherwise it returns
    and empty string - this still triggers an input context
    switching code, which, not being able to create the desired context
    (which is and empty string), falls back to looking at current
    keyboard layout (currently that code is still a FIXME).
    
    Paired with the code that signals gtk-im-module change on keyboard layout
    switches, this is sufficient to make GTK capable of switching to
    the appropriate IM context at runtime. At least, the kinds of context
    that specify languages for which they are used automatically by default
    (once locale matching is implemented), and the IME context.
    
    Loading other kinds of IM context might still work via specifying
    the gtk-im-module setting in gtk ini file, but doing so will likely
    make GTK incapable of using the IME context that is used
    for Korean, Chinese and Japanese (and some other languages).
    
    Until someone figures out a way to actually change gtk-im-module
    setting on Windows at runtime with meaningful values, the behaviour
    introduced by this commit seems like a sufficient workaround.
    66c0336e
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