XkbVirtualModsToReal(3) XKB FUNCTIONS XkbVirtualModsToReal(3)
NAME
XkbVirtualModsToReal - Determines the mapping of virtual modifiers to
core X protocol modifiers
SYNOPSIS
Bool XkbVirtualModsToReal (XkbDescPtr xkb, unsigned int virtual_mask,
unsigned int *mask_rtrn);
ARGUMENTS
xkb keyboard description for input device
virtual_mask
virtual modifier mask to translate
mask_rtrn
backfilled with real modifiers
DESCRIPTION
Xkb maintains a virtual modifier mapping, which lists the virtual modi-
fiers associated with, or bound to, each key. The real modifiers bound
to a virtual modifier always include all of the modifiers bound to any
of the keys that specify that virtual modifier in their virtual modifier
mapping. The server.vmodmap array indicates which virtual modifiers are
bound to each key; each entry is a bitmask for the virtual modifier
bits. The server.vmodmap array is indexed by keycode.
The vmodmap and vmods members of the server map are the "master" virtual
modifier definitions. Xkb automatically propagates any changes to these
fields to all other fields that use virtual modifier mappings.
For example, if Mod3 is bound to the Num_Lock key by the core protocol
modifier mapping, and the NumLock virtual modifier is bound to they
Num_Lock key by the virtual modifier mapping, Mod3 is added to the set
of modifiers associated with NumLock.
The virtual modifier mapping is normally updated whenever actions are
automatically applied to symbols and few applications should need to
change the virtual modifier mapping explicitly.
Use XkbGetMap to get the virtual modifiers from the server or use Xk-
bGetVirtualMods to update a local copy of the virtual modifiers bindings
from the server. To set the binding of a virtual modifier to a real mod-
ifier, use XkbGetVirtualMods
If the keyboard description defined by xkb includes bindings for virtual
modifiers, XkbVirtualModsToReal uses those bindings to determine the set
of real modifiers that correspond to the set of virtual modifiers speci-
fied in virtual_mask. The virtual_mask parameter is a mask specifying
the virtual modifiers to translate; the i-th bit (0 relative) of the
mask represents the i-th virtual modifier. If mask_rtrn is non-NULL, Xk-
bVirtualModsToReal backfills it with the resulting real modifier mask.
If the keyboard description in xkb does not include virtual modifier
bindings, XkbVirtualModsToReal returns False; otherwise, it returns
True.
RETURN VALUES
True The XkbVirtualModsToReal function returns True if the
keyboard description in xkb does include virtual modifier
bindings.
False The XkbVirtualModsToReal function returns False if the
keyboard description in xkb does not include virtual mod-
ifier bindings.
SEE ALSO
XkbGetMap(3), XkbGetVirtualMods(3)
NOTES
It is possible for a local (client-side) keyboard description (the xkb
parameter) to not contain any virtual modifier information (simply be-
cause the client has not requested it) while the server's corresponding
definition may contain virtual modifier information.
X Version 11 libX11 1.8.12 XkbVirtualModsToReal(3)
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