38 lines
1.7 KiB
Plaintext
38 lines
1.7 KiB
Plaintext
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The core protocol interpretation of keyboard modifiers does not include direct
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support for multiple keyboard groups, so XKB reports the effective keyboard
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group to XKB-aware clients using some of reserved bits in the state field of
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some core protocol events. This modified state field would not be interpreted
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correctly by XKB-unaware clients, so XKB provides a group compatibility mapping
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which remaps the keyboard group into a core modifier mask that has similar
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effects, when possible.
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XKB maintains three compatibility state components that are used to make
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XKB-unaware clients(*) work as well as possible:
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- The compatibility state which corresponds to the effective modifier and
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effective group state.
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- The compatibility lookup state which is the core-protocol equivalent of the
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lookup state.
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- The compatibility grab state which is the nearest core-protocol equivalent
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of the grab state.
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Compatibility state are essentially the corresponding XKB states, but with
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keyboard group possibly encoded as one or more modifiers.
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Modifiers that correspond to each keyboard group are described in this
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group compatibility map.
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----
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(*) The implementation of XKB invisibly extends the X library to use the
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keyboard extension if it is present. That means, clients that use library or
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toolkit routines to interpret keyboard events automatically use all of XKB
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features; clients that directly interpret the state field of core protocol
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events or the keymap direcly may be affected by some of the XKB differences.
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Thus most clients can take all advantages without modification but it also
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means that XKB state can be reported to clients that have not explicitly
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requested the keyboard extension.
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/* $XFree86$ */
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