XChangeKeyboardControl(display, value_mask, values)
Display *display;
unsigned long value_mask;
XKeyboardControl *values;
XGetKeyboardControl(display, values_return)
Display *display;
XKeyboardState *values_return;
XAutoRepeatOn(display)
Display *display;
XAutoRepeatOff(display)
Display *display;
XBell(display, percent)
Display *display;
int percent;
XQueryKeymap(display, keys_return)
Display *display;
char keys_return[32];
XChangeKeyboardControl can generate ``BadMatch'' and ``BadValue'' errors.
The XGetKeyboardControl function returns the current control values for the keyboard to the XKeyboardState structure.
The XAutoRepeatOn function turns on auto-repeat for the keyboard on the specified display.
The XAutoRepeatOff function turns off auto-repeat for the keyboard on the specified display.
The XBell function rings the bell on the
keyboard on the specified display, if possible.
The specified volume is relative to the base volume for the keyboard.
If the value for the percent argument is not in the range -100 to 100
inclusive, a ``BadValue'' error results.
The volume at which the bell rings
when the percent argument is nonnegative is:
base - [(base * percent) / 100] + percent
The volume at which the bell rings
when the percent argument is negative is:
base + [(base * percent) / 100]
To change the base volume of the bell, use XChangeKeyboardControl.
XBell can generate a ``BadValue'' error.
The XQueryKeymap function returns a bit vector for the logical state of the keyboard, where each bit set to 1 indicates that the corresponding key is currently pressed down. The vector is represented as 32 bytes. Byte N (from 0) contains the bits for keys 8N to 8N + 7 with the least significant bit in the byte representing key 8N.
Note that the logical state of a device (as seen by client applications)
may lag the physical state if device event processing is frozen.
/* Mask bits for ChangeKeyboardControl */
| #define | KBKeyClickPercent | (1L<<0) |
| #define | KBBellPercent | (1L<<1) |
| #define | KBBellPitch | (1L<<2) |
| #define | KBBellDuration | (1L<<3) |
| #define | KBLed | (1L<<4) |
| #define | KBLedMode | (1L<<5) |
| #define | KBKey | (1L<<6) |
| #define | KBAutoRepeatMode | (1q<<7) |
/* Values */typedef struct { int key_click_percent; int bell_percent; int bell_pitch; int bell_duration; int led; int led_mode; /* LedModeOn, LedModeOff */ int key; int auto_repeat_mode; /* AutoRepeatModeOff, AutoRepeatModeOn, AutoRepeatModeDefault */ } XKeyboardControl;
The key_click_percent member sets the volume for key
clicks between 0 (off) and 100 (loud) inclusive, if possible.
A setting of -1 restores the default.
Other negative values generate a ``BadValue'' error.
The bell_percent sets the base volume for the bell
between 0 (off) and 100 (loud) inclusive, if possible.
A setting of -1 restores the default.
Other negative values generate a ``BadValue'' error.
The bell_pitch member sets the pitch
(specified in Hz) of the bell, if possible.
A setting of -1 restores the default.
Other negative values generate a ``BadValue'' error.
The bell_duration member sets the duration of the
bell specified in milliseconds, if possible.
A setting of -1 restores the default.
Other negative values generate a ``BadValue'' error.
If both the led_mode and led members are specified,
the state of that LED is changed, if possible.
The led_mode member can be set to LedModeOn
or LedModeOff.
If only led_mode is specified, the state of
all LEDs are changed, if possible.
At most 32 LEDs numbered from one are supported.
No standard interpretation of LEDs is defined.
If led is specified without led_mode,
a ``BadMatch'' error results.
If both the auto_repeat_mode and key members are specified,
the auto_repeat_mode of that key is changed (according to
AutoRepeatModeOn, AutoRepeatModeOff, or
AutoRepeatModeDefault), if possible.
If only auto_repeat_mode is specified,
the global auto_repeat_mode for the entire keyboard is
changed, if possible, and does not affect the per-key settings.
If a key is specified without an auto_repeat_mode,
a ``BadMatch'' error results.
Each key has an individual mode of whether or not it
should auto-repeat and a default setting for the mode.
In addition,
there is a global mode of whether auto-repeat should be
enabled or not and a default setting for that mode.
When global mode is AutoRepeatModeOn,
keys should obey their individual auto-repeat modes.
When global mode is AutoRepeatModeOff,
no keys should auto-repeat.
An auto-repeating key generates alternating
KeyPress and KeyRelease events.
When a key is used as a modifier,
it is desirable for the key not to auto-repeat,
regardless of its auto-repeat setting.
The XKeyboardState structure contains:
typedef struct {
int key_click_percent;
int bell_percent;
unsigned int bell_pitch, bell_duration;
unsigned long led_mask;
int global_auto_repeat;
char auto_repeats[32];
} XKeyboardState;
For the LEDs, the least significant bit of
led_mask corresponds to LED one,
and each bit set to 1 in led_mask
indicates an LED that is lit.
The global_auto_repeat member can be set to
AutoRepeatModeOn or AutoRepeatModeOff.
The auto_repeats member is a bit vector.
Each bit set to 1 indicates that auto-repeat is enabled
for the corresponding key.
The vector is represented as 32 bytes.
Byte N (from 0) contains the bits for keys
8N to 8N + 7 with the least significant
bit in the byte representing key 8N.