1XChangeKeyboardControl(3) XLIB FUNCTIONS XChangeKeyboardControl(3)
2
6 XChangeKeyboardControl, XGetKeyboardControl, XAutoRepeatOn, XAutoRe‐
7 peatOff, XBell, XQueryKeymap, XKeyboardControl - manipulate keyboard
8 settings and keyboard control structure
9
11 int XChangeKeyboardControl(Display *display, unsigned long value_mask,
12 XKeyboardControl *values);
13 int XGetKeyboardControl(Display *display, XKeyboardState *val‐
15 ues_return);
16 int XAutoRepeatOn(Display *display);
18 int XAutoRepeatOff(Display *display);
20 int XBell(Display *display, int percent);
22 int XQueryKeymap(Display *display, char keys_return[32]);
24
26 display Specifies the connection to the X server.
27 keys_return
29 Returns an array of bytes that identifies which keys are
30 pressed down. Each bit represents one key of the keyboard.
31 percent Specifies the volume for the bell, which can range from -100
33 to 100 inclusive.
34 value_mask
36 Specifies which controls to change. This mask is the bitwise
37 inclusive OR of the valid control mask bits.
38 values Specifies one value for each bit set to 1 in the mask.
40 values_return
42 Returns the current keyboard controls in the specified XKey‐
43 boardState structure.
44
46 The XChangeKeyboardControl function controls the keyboard characteris‐
47 tics defined by the XKeyboardControl structure. The value_mask argu‐
48 ment specifies which values are to be changed.
49 XChangeKeyboardControl can generate BadMatch and BadValue errors.
51 The XGetKeyboardControl function returns the current control values for
53 the keyboard to the XKeyboardState structure.
54 The XAutoRepeatOn function turns on auto-repeat for the keyboard on the
56 specified display.
57 The XAutoRepeatOff function turns off auto-repeat for the keyboard on
59 the specified display.
60 The XBell function rings the bell on the keyboard on the specified dis‐
62 play, if possible. The specified volume is relative to the base volume
63 for the keyboard. If the value for the percent argument is not in the
64 range -100 to 100 inclusive, a BadValue error results. The volume at
65 which the bell rings when the percent argument is nonnegative is:
66 base - [(base * percent) / 100] + percent
68 The volume at which the bell rings when the percent argument is nega‐
70 tive is:
71 base + [(base * percent) / 100]
73 To change the base volume of the bell, use XChangeKeyboardControl.
75 XBell can generate a BadValue error.
77 The XQueryKeymap function returns a bit vector for the logical state of
79 the keyboard, where each bit set to 1 indicates that the corresponding
80 key is currently pressed down. The vector is represented as 32 bytes.
81 Byte N (from 0) contains the bits for keys 8N to 8N + 7 with the least
82 significant bit in the byte representing key 8N.
83 Note that the logical state of a device (as seen by client applica‐
85 tions) may lag the physical state if device event processing is frozen.
86
88 The XKeyboardControl structure contains:
89 /* Mask bits for ChangeKeyboardControl */
91 #define KBKeyClickPercent (1L<<0)
93 #define KBBellPercent (1L<<1)
94 #define KBBellPitch (1L<<2)
95 #define KBBellDuration (1L<<3)
96 #define KBLed (1L<<4)
97 #define KBLedMode (1L<<5)
98 #define KBKey (1L<<6)
99 #define KBAutoRepeatMode (1L<<7)
100 /* Values */
101 typedef struct {
103 int key_click_percent;
104 int bell_percent;
105 int bell_pitch;
106 int bell_duration;
107 int led;
108 int led_mode; /* LedModeOn, LedModeOff */
109 int key;
110 int auto_repeat_mode;/* AutoRepeatModeOff, AutoRepeatModeOn,
111 AutoRepeatModeDefault */
112 } XKeyboardControl;
113 The key_click_percent member sets the volume for key clicks between 0
115 (off) and 100 (loud) inclusive, if possible. A setting of -1 restores
116 the default. Other negative values generate a BadValue error.
117 The bell_percent sets the base volume for the bell between 0 (off) and
119 100 (loud) inclusive, if possible. A setting of -1 restores the
120 default. Other negative values generate a BadValue error. The
121 bell_pitch member sets the pitch (specified in Hz) of the bell, if pos‐
122 sible. A setting of -1 restores the default. Other negative values
123 generate a BadValue error. The bell_duration member sets the duration
124 of the bell specified in milliseconds, if possible. A setting of -1
125 restores the default. Other negative values generate a BadValue error.
126 If both the led_mode and led members are specified, the state of that
128 LED is changed, if possible. The led_mode member can be set to LedMod‐
129 eOn or LedModeOff. If only led_mode is specified, the state of all
130 LEDs are changed, if possible. At most 32 LEDs numbered from one are
131 supported. No standard interpretation of LEDs is defined. If led is
132 specified without led_mode, a BadMatch error results.
133 If both the auto_repeat_mode and key members are specified, the
135 auto_repeat_mode of that key is changed (according to AutoRepeatModeOn,
136 AutoRepeatModeOff, or AutoRepeatModeDefault), if possible. If only
137 auto_repeat_mode is specified, the global auto_repeat_mode for the
138 entire keyboard is changed, if possible, and does not affect the per-
139 key settings. If a key is specified without an auto_repeat_mode, a
140 BadMatch error results. Each key has an individual mode of whether or
141 not it should auto-repeat and a default setting for the mode. In addi‐
142 tion, there is a global mode of whether auto-repeat should be enabled
143 or not and a default setting for that mode. When global mode is
144 AutoRepeatModeOn, keys should obey their individual auto-repeat modes.
145 When global mode is AutoRepeatModeOff, no keys should auto-repeat. An
146 auto-repeating key generates alternating KeyPress and KeyRelease
147 events. When a key is used as a modifier, it is desirable for the key
148 not to auto-repeat, regardless of its auto-repeat setting.
149 The XKeyboardState structure contains:
151 typedef struct {
153 int key_click_percent;
154 int bell_percent;
155 unsigned int bell_pitch, bell_duration;
156 unsigned long led_mask;
157 int global_auto_repeat;
158 char auto_repeats[32];
159 } XKeyboardState;
160 For the LEDs, the least significant bit of led_mask corresponds to LED
162 one, and each bit set to 1 in led_mask indicates an LED that is lit.
163 The global_auto_repeat member can be set to AutoRepeatModeOn or AutoRe‐
164 peatModeOff. The auto_repeats member is a bit vector. Each bit set to
165 1 indicates that auto-repeat is enabled for the corresponding key. The
166 vector is represented as 32 bytes. Byte N (from 0) contains the bits
167 for keys 8N to 8N + 7 with the least significant bit in the byte repre‐
168 senting key 8N.
169
171 BadMatch Some argument or pair of arguments has the correct type and
172 range but fails to match in some other way required by the
173 request.
174 BadValue Some numeric value falls outside the range of values accepted
176 by the request. Unless a specific range is specified for an
177 argument, the full range defined by the argument's type is
178 accepted. Any argument defined as a set of alternatives can
179 generate this error.
180
182 XChangeKeyboardMapping(3), XSetPointerMapping(3)
183 Xlib - C Language X Interface
184X Version 11 libX11 1.3.4 XChangeKeyboardControl(3)