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For historical reasons, In the days of MS-DOS, Japanese input was created as a character device driver. This character device was a virtual Japanese typewriter. it was called a front-end processor (FEP). Today, it is called input method editor(IME).
This image is an old Japanese typewriter. an user has picked up character from the board. Japanese typewriter SH-280.jpg
Today, users do not use keyboards with such a large number of keys, Currently used physical keyboards are mainly keyboards for inputting English text and keyboards with some additional keys. In the Japanese environment, a keyboard with 106 keys, the specifications of which were determined by OADG, and a 109 keyboard with three additional Win and App keys are used. Depending on user preferences, 101/104 keyboards are also used. In other words, it's almost the same as your keyboard. but from the application's point of view, they appear to be using keyboard with a large number of keys. In windows, that is the character you receive using WM_CHAR.
This mechanism worked very well, keeping application changes to a minimum.
DearImGui-with-IMM32 implements this minimal change.
Far East Asian languages will not be able to enter their own words without this IME support. Therefore, IME support is essential for today's Far East Asian character input.
I explained that the role of the IME is to implement such a virtual keyboard with many keys. Now, how to use such a virtual keyboard.
Note
Alt + `and Alt + @ are assigned to the IME ON / OFF key for historical reasons. Be careful when choosing shortcut keys for your application.
Recent IMEs also capture Alt + Backspace and IME is enabled. Please note that Alt + Backspace works differently on Google IME.
IME has several implementations.
Unfortunately, the behavior is slightly different depending on the implementation. Here are the major implementations.
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Microsoft IME -- IME standard in Microsoft Windows
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ATOK -- Software with a long history. it has been used for over 30 years