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KeyboardMapping(3X11)
NAME
XChangeKeyboardMapping, XGetKeyboardMapping,
XDisplayKeycodes, XSetModifierMapping, XGetModifierMapping,
XNewModifiermap, XInsertModifiermapEntry,
XDeleteModifiermapEntry, XFreeModifierMap XModifierKeymap -
manipulate keyboard encoding and keyboard encoding structure
SYNTAX
XChangeKeyboardMapping(display, first_keycode,
keysyms_per_keycode, keysyms, num_codes)
Display *display;
int first_keycode;
int keysyms_per_keycode;
KeySym *keysyms;
int num_codes;
KeySym *XGetKeyboardMapping(display, first_keycode,
keycode_count,
keysyms_per_keycode_return)
Display *display;
KeyCode first_keycode;
int keycode_count;
int *keysyms_per_keycode_return;
XDisplayKeycodes(display, min_keycodes_return,
max_keycodes_return)
Display *display;
int *min_keycodes_return, *max_keycodes_return;
int XSetModifierMapping(display, modmap)
Display *display;
XModifierKeymap *modmap;
XModifierKeymap *XGetModifierMapping(display)
Display *display;
XModifierKeymap *XNewModifiermap(max_keys_per_mod)
int max_keys_per_mod;
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KeyboardMapping(3X11)
XModifierKeymap *XInsertModifiermapEntry(modmap,
keycode_entry, modifier)
XModifierKeymap *modmap;
KeyCode keycode_entry;
int modifier;
XModifierKeymap *XDeleteModifiermapEntry(modmap,
keycode_entry, modifier)
XModifierKeymap *modmap;
KeyCode keycode_entry;
int modifier;
XFreeModifiermap(modmap)
XModifierKeymap *modmap;
ARGUMENTS
display Specifies the connection to the X server.
first_keycode
Specifies the first KeyCode that is to be changed
or returned.
keycode_count
Specifies the number of KeyCodes that are to be
returned.
keycode_entry
Specifies the KeyCode.
keysyms Specifies a pointer to an array of KeySyms.
keysyms_per_keycode
Specifies the number of KeySyms per KeyCode.
keysyms_per_keycode_return
Returns the number of KeySyms per KeyCode.
max_keys_per_mod
Specifies the number of KeyCode entries
preallocated to the modifiers in the map.
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KeyboardMapping(3X11)
max_keycodes_return
Returns the maximum number of KeyCodes.
min_keycodes_return
Returns the minimum number of KeyCodes.
modifier Specifies the modifier.
modmap Specifies a pointer to the XModifierKeymap
structure.
num_codes Specifies the number of KeyCodes that are to be
changed.
DESCRIPTION
The XChangeKeyboardMapping function defines the symbols for
the specified number of KeyCodes starting with
first_keycode. The symbols for KeyCodes outside this range
remain unchanged. The number of elements in keysyms must be:
num_codes * keysyms_per_keycode
The specified first_keycode must be greater than or equal to
min_keycode returned by XDisplayKeycodes, or a BadValue
error results. In addition, the following expression must
be less than or equal to max_keycode as returned by
XDisplayKeycodes, or a BadValue error results:
first_keycode + num_codes - 1
KeySym number N, counting from zero, for KeyCode K has the
following index in keysyms, counting from zero:
(K - first_keycode) * keysyms_per_keycode + N
The specified keysyms_per_keycode can be chosen arbitrarily
by the client to be large enough to hold all desired
symbols. A special KeySym value of NoSymbol should be used
to fill in unused elements for individual KeyCodes. It is
legal for NoSymbol to appear in nontrailing positions of the
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KeyboardMapping(3X11)
effective list for a KeyCode. XChangeKeyboardMapping
generates a MappingNotify event.
There is no requirement that the X server interpret this
mapping. It is merely stored for reading and writing by
clients.
XChangeKeyboardMapping can generate BadAlloc and BadValue
errors.
The XGetKeyboardMapping function returns the symbols for the
specified number of KeyCodes starting with first_keycode.
The value specified in first_keycode must be greater than or
equal to min_keycode as returned by XDisplayKeycodes, or a
BadValue error results. In addition, the following
expression must be less than or equal to max_keycode as
returned by XDisplayKeycodes:
first_keycode + keycode_count - 1
If this is not the case, a BadValue error results. The
number of elements in the KeySyms list is:
keycode_count * keysyms_per_keycode_return
KeySym number N, counting from zero, for KeyCode K has the
following index in the list, counting from zero:
(K - first_code) * keysyms_per_code_return + N
The X server arbitrarily chooses the
keysyms_per_keycode_return value to be large enough to
report all requested symbols. A special KeySym value of
NoSymbol is used to fill in unused elements for individual
KeyCodes. To free the storage returned by
XGetKeyboardMapping, use XFree.
XGetKeyboardMapping can generate a BadValue error.
The XDisplayKeycodes function returns the min-keycodes and
max-keycodes supported by the specified display. The
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KeyboardMapping(3X11)
minimum number of KeyCodes returned is never less than 8,
and the maximum number of KeyCodes returned is never greater
than 255. Not all KeyCodes in this range are required to
have corresponding keys.
The XSetModifierMapping function specifies the KeyCodes of
the keys (if any) that are to be used as modifiers. If it
succeeds, the X server generates a MappingNotify event, and
XSetModifierMapping returns MappingSuccess. X permits at
most eight modifier keys. If more than eight are specified
in the XModifierKeymap structure, a BadLength error results.
The modifiermap member of the XModifierKeymap structure
contains eight sets of max_keypermod KeyCodes, one for each
modifier in the order Shift, Lock, Control, Mod1, Mod2,
Mod3, Mod4, and Mod5. Only nonzero KeyCodes have meaning in
each set, and zero KeyCodes are ignored. In addition, all
of the nonzero KeyCodes must be in the range specified by
min_keycode and max_keycode in the Display structure, or a
BadValue error results. No KeyCode may appear twice in the
entire map, or a BadValue error results.
An X server can impose restrictions on how modifiers can be
changed, for example, if certain keys do not generate up
transitions in hardware, if auto-repeat cannot be disabled
on certain keys, or if multiple modifier keys are not
supported. If some such restriction is violated, the status
reply is MappingFailed, and none of the modifiers are
changed. If the new KeyCodes specified for a modifier
differ from those currently defined and any (current or new)
keys for that modifier are in the logically down state,
XSetModifierMapping returns MappingBusy, and none of the
modifiers is changed.
XSetModifierMapping can generate BadAlloc and BadValue
errors.
The XGetModifierMapping function returns a pointer to a
newly created XModifierKeymap structure that contains the
keys being used as modifiers. The structure should be freed
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after use by calling XFreeModifiermap. If only zero values
appear in the set for any modifier, that modifier is
disabled.
The XNewModifiermap function returns a pointer to
XModifierKeymap structure for later use.
The XInsertModifiermapEntry function adds the specified
KeyCode to the set that controls the specified modifier and
returns the resulting XModifierKeymap structure (expanded as
needed).
The XDeleteModifiermapEntry function deletes the specified
KeyCode from the set that controls the specified modifier
and returns a pointer to the resulting XModifierKeymap
structure.
The XFreeModifiermap function frees the specified
XModifierKeymap structure.
STRUCTURES
The XModifierKeymap structure contains:
typedef struct {
int max_keypermod; /* This server's max number of keys per modifier */
KeyCode *modifiermap;/* An 8 by max_keypermod array of the modifiers */
} XModifierKeymap;
DIAGNOSTICS
BadAlloc The server failed to allocate the requested
resource or server memory.
BadValue Some numeric value falls outside the range of
values accepted by the request. Unless a specific
range is specified for an argument, the full range
defined by the argument's type is accepted. Any
argument defined as a set of alternatives can
generate this error.
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KeyboardMapping(3X11)
SEE ALSO
XFree(3X11), XSetPointerMapping(3X11)
Xlib - C Language X Interface
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