Status, Composition, and Candidates Windows
The status, composition, and candidates windows form the user interface for
the IME. The
status window indicates that the IME is open and provides the user the means to set the
conversion modes. The
composition window appears when the user enters text and, depending on the conversion mode,
either displays the text as entered or displays converted text. The
candidates window appears in conjunction with the composition window. It contains a list of
"candidates" (alternative characters) for the selected character or characters in
the composition window. The user can scroll through the candidates list and
select the desired character(s), then return to the composition window. The user
can compose the desired text in this way until the composition string is
finalized and the window is closed. The IME sends the composed characters to the
application in the form of
WM_IME_CHAR or
WM_IME_COMPOSITION/GCS_RESULT messages. If the application does not process these messages, the
DefWindowProc function translates them into one or more
WM_CHAR messages.
By default, the system automatically creates and manages status, composition,
and candidates windows for all windows that require text input. For many
applications, this default processing is sufficient. These applications rely entirely
on the system for IME support and are said to be
IME-unaware because they are unaware of the many tasks the system carries out to manage
the IME windows.
An
IME-aware application, on the other hand, participates in the creation and management
of IME windows. Such applications control the operation, position, and
appearance of the default windows by sending messages to and by intercepting and
processing messages intended for these windows. In some cases, applications create
their own IME windows and provide complete processing for their custom status,
composition and candidates windows.
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