1XkbDeviceBellEvent(3) XKB FUNCTIONS XkbDeviceBellEvent(3)
2
6 XkbDeviceBellEvent - Creates a bell event for an X input extension
7 device or for the keyboard, without ringing the corresponding bell
8
10 Bool XkbDeviceBellEvent (Display *display, Window window, unsigned int
11 device_spec, unsigned int bell_class, unsigned int bell_id, int
12 percent, Atom name);
13
15 - display
16 connection to the X server
17 - window
19 event window, or None
20 - device_spec
22 device ID, or XkbUseCoreKbd
23 - bell_class
25 input extension bell class for the event
26 - bell_id
28 input extension bell ID for the event
29 - percent
31 volume for the bell, which can range from -100 to 100 inclusive
32 - name a bell name, or NULL
34
36 The core X protocol allows only applications to explicitly sound the
37 system bell with a given duration, pitch, and volume. Xkb extends this
38 capability by allowing clients to attach symbolic names to bells, dis‐
39 able audible bells, and receive an event whenever the keyboard bell is
40 rung. For the purposes of this document, the audible bell is defined to
41 be the system bell, or the default keyboard bell, as opposed to any
42 other audible sound generated elsewhere in the system. You can ask to
43 receive XkbBellNotify events when any client rings any one of the fol‐
44 lowing:
45 · The default bell
48 · Any bell on an input device that can be specified by a bell_class
50 and bell_id pair
51 · Any bell specified only by an arbitrary name. (This is, from the
53 server's point of view, merely a name, and not connected with any
54 physical sound-generating device. Some client application must
55 generate the sound, or visual feedback, if any, that is associated
56 with the name.)
57 You can also ask to receive XkbBellNotify events when the server
59 rings the default bell or if any client has requested events only
60 (without the bell sounding) for any of the bell types previously
61 listed.
62 You can disable audible bells on a global basis. For example, a
64 client that replaces the keyboard bell with some other audible cue
65 might want to turn off the AudibleBell control to prevent the
66 server from also generating a sound and avoid cacophony. If you
67 disable audible bells and request to receive XkbBellNotify events,
68 you can generate feedback different from the default bell.
69 You can, however, override the AudibleBell control by calling one
71 of the functions that force the ringing of a bell in spite of the
72 setting of the AudibleBell control - XkbForceDeviceBell or Xkb‐
73 ForceBell. In this case the server does not generate a bell
74 event.
75 Just as some keyboards can produce keyclicks to indicate when a
77 key is pressed or repeating, Xkb can provide feedback for the con‐
78 trols by using special beep codes. The AccessXFeedback control is
79 used to configure the specific types of operations that generate
80 feedback.
81 Bell Names
83 You can associate a name to an act of ringing a bell by converting
85 the name to an Atom and then using this name when you call the
86 functions listed in this chapter. If an event is generated as a
87 result, the name is then passed to all other clients interested in
88 receiving XkbBellNotify events. Note that these are arbitrary
89 names and that there is no binding to any sounds. Any sounds or
90 other effects (such as visual bells on the screen) must be gener‐
91 ated by a client application upon receipt of the bell event con‐
92 taining the name. There is no default name for the default key‐
93 board bell. The server does generate some predefined bells for the
94 AccessX controls. These named bells are shown in the Table 1
95 below; the name is included in any bell event sent to clients that
96 have requested to receive XkbBellNotify events.
97 Table 1 Predefined Bells
100 ──────────────────────────────────────────────────────────────
101 Action Named Bell
102 ──────────────────────────────────────────────────────────────
103 Indicator turned on AX_IndicatorOn
104 Indicator turned off AX_IndicatorOff
105 More than one indicator changed state AX_IndicatorChange
106 Control turned on AX_FeatureOn
107 Control turned off AX_FeatureOff
108 More than one control changed state AX_FeatureChange
109 SlowKeys and BounceKeys about to be AX_SlowKeysWarning
110 turned on or off
111 SlowKeys key pressed AX_SlowKeyPress
112 SlowKeys key accepted AX_SlowKeyAccept
113 SlowKeys key rejected AX_SlowKeyReject
114 Accepted SlowKeys key released AX_SlowKeyRelease
115 BounceKeys key rejected AX_BounceKeyReject
116 StickyKeys key latched AX_StickyLatch
117 StickyKeys key locked AX_StickyLock
118 StickyKeys key unlocked AX_StickyUnlock
119 Audible Bells
121 Using Xkb you can generate bell events that do not necessarily
123 ring the system bell. This is useful if you need to use an audio
124 server instead of the system beep. For example, when an audio
125 client starts, it could disable the audible bell (the system bell)
126 and then listen for XkbBellNotify events. When it receives a
127 XkbBellNotify event, the audio client could then send a request to
128 an audio server to play a sound.
129 You can control the audible bells feature by passing the XkbAudi‐
131 bleBellMask to XkbChangeEnabledControls. If you set XkbAudible‐
132 BellMask on, the server rings the system bell when a bell event
133 occurs. This is the default. If you set XkbAudibleBellMask off and
134 a bell event occurs, the server does not ring the system bell
135 unless you call XkbForceDeviceBell or XkbForceBell.
136 Audible bells are also part of the per-client auto-reset controls.
138 Bell Functions
140 Use the functions described in this section to ring bells and to
142 generate bell events.
143 The input extension has two types of feedbacks that can generate
145 bells - bell feedback and keyboard feedback. Some of the functions
146 in this section have bell_class and bell_id parameters; set them
147 as follows: Set bell_class to BellFeedbackClass or KbdFeedback‐
148 Class. A device can have more than one feedback of each type; set
149 bell_id to the particular bell feedback of bell_class type.
150 Table 2 shows the conditions that cause a bell to sound or an
152 XkbBellNotifyEvent to be generated when a bell function is called.
153 Table 2 Bell Sounding and Bell Event Generating
156 ───────────────────────────────────────────────────────────────────────────
157 Function called AudibleBell Server sounds a bell Server sends an
158 XkbBellNotifyEvent
159 ───────────────────────────────────────────────────────────────────────────
160 XkbDeviceBell On Yes Yes
161 XkbDeviceBell Off No Yes
162 XkbBell On Yes Yes
163 XkbBell Off No Yes
164 XkbDeviceBellEvent On or Off No Yes
165 XkbBellEvent On or Off No Yes
166 XkbDeviceForceBell On or Off Yes No
167 XkbForceBell On or Off Yes No
168 If a compatible keyboard extension isn't present in the X server,
170 XkbDeviceBellEvent immediately returns False. Otherwise, XkbDe‐
171 viceBellEvent causes an XkbBellNotify event to be sent to all
172 interested clients and returns True. Set percent to be the volume
173 relative to the base volume for the keyboard as described for
174 XBell.
175 In addition, XkbDeviceBellEvent may generate Atom protocol errors
177 as well as XkbBellNotify events. You can call XkbBell without
178 first initializing the keyboard extension.
179
181 True The XkbDeviceBellEvent sends an XkbBellNotify event to
182 to all interested clients and returns True.
183 False If a compatible keyboard extension isn't present in the
185 X server, XkbDeviceBellEvent immediately returns False
186
188 Xkb generates XkbBellNotify events for all bells except for those
189 resulting from
190 calls to XkbForceDeviceBell and XkbForceBell. To receive
191 XkbBellNotify events under all possible conditions, pass
192 XkbBellNotifyMask in both the bits_to_change and values_for_bits
193 parameters to XkbSelectEvents.
194 The XkbBellNotify event has no event details. It is either
196 selected or it is not. However, you can call XkbSelectEventDe‐
197 tails using XkbBellNotify as the event_type and specifying
198 XkbAllBellEventsMask in bits_to_change and values_for_bits.
199 This has the same effect as a call to XkbSelectEvents.
200 The structure for the XkbBellNotify event type contains:
202 typedef struct _XkbBellNotify {
204 int type; /∗ Xkb extension base event code */
205 unsigned long serial; /∗ X server serial number for event */
206 Bool send_event; /∗ True => synthetically generated */
207 Display * display; /∗ server connection where event generated */
208 Time time; /∗ server time when event generated */
209 int xkb_type; /∗ XkbBellNotify */
210 unsigned int device; /∗ Xkb device ID, will not be XkbUseCoreKbd */
211 int percent; /∗ requested volume as % of max */
212 int pitch; /∗ requested pitch in Hz */
213 int duration; /∗ requested duration in microseconds */
214 unsigned int bell_class; /∗ X input extension feedback class */
215 unsigned int bell_id; /∗ X input extension feedback ID */
216 Atom name; /∗ "name" of requested bell */
217 Window window; /∗ window associated with event */
218 Bool event_only; /∗ False -> the server did not produce a beep */
219 } XkbBellNotifyEvent;
220 If your application needs to generate visual bell feedback on
222 the screen when it receives a bell event, use the window ID in
223 the XkbBellNotifyEvent, if present.
224
227 XBell(3), XkbBellNotify(3), XkbChangeEnabledControls(3), XkbDevice‐
228 Bell(3), XkbForceBell(3), XkbForceDeviceBell(3), XkbSelectEvents(3),
229 XkbSelectEventDetails(3), XkbUseCoreKbd(3)
230X Version 11 libX11 1.6.9 XkbDeviceBellEvent(3)