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Create custom keyboard layouts in 10.2
Authored by: mundie1010 on Feb 02, '04 10:53:48PM
As I said before, I love the XML key layout mechanism. Today I heard from a friend who encountered three bugs in the XML key layout processor, and felt I should pass the information along:

I tried writing XML keylayout files for Arabic, Georgian and Deseret alphabet. After hitting my head against the wall, and rewriting things 15 different ways, without success, I finally got in touch with the right font/Unicode people at Apple.

My three keylayout files were valid but uncovered three bugs. It seems that I was trying to do things that were quite legal, and anticipated in a general way, but never tested.

First, the XML keylayout spec allows you to group named elements inside an element, OR you can put anonymous elements inside entries. Well, there was a bug in the handling of anonymous actions. Workaround: revert to named actions in an actions element.

Second, elements have an attribute named "maxout", which is optional. I had set it at "1", indicating a maximum output of 1 Unicode character at a time. However (second bug) when using dead-key sequences you have to specify maxout="2", even if only one character gets output at a time. And if you are outputting characters from the surrogate space, it needs to be maxout="2" again. Workaround: just don't specify the maxout attribute. It's optional, and even specifying it "correctly" can cause trouble.

Third, I learn that there's a long-standing bug in Cocoa that chokes on dead-key sequences that output surrogate characters. So my Deseret input method didn't work either. No workaround for this one.

Apparently these bugs will be fixed in a future release.

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